Steven J. Johnston
Chairman and Chief Executive Officer at Cincinnati Financial
Good morning, and thank you for joining us today to hear more about our results. In short, we are off to a great start. Our first quarter results reflect the success of our initiatives to continue balancing the profit and growth of our insurance operations coupled with strong investment income. Net income of $755 million for the first quarter of 2024 included recognition of $484 million on an after-tax basis were the increase in fair value of equity securities still held, representing about three quarters of the increase in net income. Strong operating results generated the rest of the increase.
Non-GAAP operating income of $272 million for the first quarter nearly doubled last year's $141 million, including a decrease in catastrophe losses of $93 million on an after-tax basis. The 93.6% first quarter 2024 property casualty combined ratio was 7.1 points better than the first quarter of last year, including a decrease of 6.9 points for catastrophe losses.
While our combined ratio for accident year 2024 before catastrophe losses was a percentage point higher than accident year 2023 at three months, if we exclude Cincinnati Re and Cincinnati Global, the ratio improved by 1 point. Accident year 2024 also improved on a case incurred basis. However, we increased incurred but not reported or IBNR reserves as we continue to recognize uncertainty regarding ultimate losses and remain prudent in our reserve estimates until longer-term loss cost trends become more clear.
We are also pleased with other measures indicating good momentum in our operating performance. Another quarter of pricing segmentation by risk plus average price increases helped to improve our underwriting profitability, combining with careful risk selection and other efforts to address elevated inflation effects on incurred losses.
Agencies representing Cincinnati Insurance, supported by our experienced and professional associates produced another quarter of profitable business for us. Our underwriters continue to emphasize retaining profitable accounts and managing ones that we determine have inadequate pricing based on our risk selection and pricing expertise.
Estimated average renewal price increases for the first quarter continued at a healthy pace with commercial lines near the low-end of the high single-digit percentage range, excess and surplus lines in the high single-digit range. Personal auto in the low double-digit range, and homeowner in the high single-digit range. Our consolidated property casualty net written premiums grew 11% for the quarter with what we believe was a nice mix of new business and renewals.
I'll briefly review operating performance by insurance segment, highlighting premium growth and improved profitability compared to a year ago. Commercial lines grew net written premiums 7% in the first quarter with a 96.5% combined ratio that improved by 3.9 percentage points, including 4.2 points from lower catastrophe losses.
Personal lines grew net written premiums 33%, including growth in middle-market accounts in addition to private client business for our agency's high-net worth clients. It's combined ratio was a very profitable 93.9%, 18.6 percentage points better than last year, including 15.9 points from lower catastrophe losses.
Excess and surplus lines also produced a profitable combined ratio of 91.9%, rising 2 percentage points from the first quarter a year ago, along with net written premium growth of 7%. Both Cincinnati Re and Cincinnati Global continue to produce significant underwriting profit, reflecting our efforts to diversify risk and further improve income stability.
Cincinnati Re's combined ratio for the first quarter of 2024 was an excellent 78.6%. That includes IBNR that we routinely carry for expected losses from reinsurance treaties. We believe our potential exposure for losses from the Baltimore bridge collapse is immaterial. Cincinnati Re's net written premiums decreased by 12% overall, driven by a shifting casualty portfolio mix in response to changing market conditions. Property and specialty premiums increased due to attractive opportunities in pricing.
Cincinnati Global's combined ratio was also excellent at 69.8%, they again reported strong growth with net written premiums up 28%. Our life insurance subsidiary continued its strong performance, including first quarter 2024 net income of $19 million, and operating income growth of 17%. Term life insurance earned premiums grew 2%.
I'll conclude with our primary measure of long-term financial performance to value creation ratio. Our first quarter 2024 VCR was a strong 5.9%. Net income before investment gains or losses for the quarter contributed 2.3%, higher overall valuation of our investment portfolio and other items contributed 3.6%.
Next, Chief Financial Officer, Mike Sewell, will add comments to highlight other parts of our financial performance.