Bill Bullock
Executive Vice President and Chief Financial Officer at ConocoPhillips
Thanks, Ryan. In the fourth quarter, we generated $2.40 per share in adjusted earnings. We produced 1,902,000 barrels of oil equivalent per day representing 4% underlying growth year-over-year. This was consistent with our full year 2023 underlying growth rate of 4% also. Fourth quarter Lower 48 production averaged 1,086,000 barrels of oil equivalent per day, which represented a 9% underlying growth year-over-year. We produced 750,000 from the Permian, 211,000 from the Eagle Ford, and 110,000 from the Bakken. Full year 2023 underlying growth for the Lower 48 was roughly 8%.
Moving to cash flows. Fourth quarter CFO was $5.5 billion, and this included APLNG distributions of $281 million. Fourth quarter capital expenditures were $2.9 billion, which included $573 million for longer cycle projects. Full year capital expenditures were $11.2 billion, which included $2 billion for longer cycle projects.
Now regarding returns of capital, we delivered $11 billion to shareholders in 2023. For the fourth quarter, we returned $2.5 billion. This was via $1.1 billion in share buybacks and $1.4 billion in ordinary dividends and VROC payments. We ended the year with cash and short-term investments of $6.9 billion as well as $1 billion in long-term investments.
Turning to guidance. We forecast 2024 production to be in the range of 1.91 million to 1.95 million barrels of oil equivalent per day. This translates to 2% to 4% underlying growth pro forma for acquisitions and dispositions. We expect this growth to be well balanced between both Lower 48 and international. Our full year forecast includes turnaround impacts of 25,000 to 30,000 barrels per day, which is about 10,000 higher than in 2023. Now turnarounds are expected to be concentrated in the third quarter when Surmont completes a one month turnaround, and that turnaround occurs once every five years.
For the first quarter, production guidance is in a range of 1.88 billion to 1.92 million barrels of oil equivalent per day, a roughly 1% to 3% underlying growth. While the first quarter will have minimal turnarounds, similar to the fourth quarter, it does include a 20,000 barrel per day headwind from January weather impacts. For APLNG, we expect distributions of $400 million in the first quarter and $1.3 billion for the full year.
Now shifting to cost guidance. We see full year adjusted operating cost in a range of $8.9 billion to $9.1 billion, representing essentially flat unit costs on a year-over-year basis. Full year cash exploration expenses are expected to be $300 million to $400 million, and DD&A expense is expected to be in the range of $9.4 billion to $9.6 billion.
Full year adjusted corporate segment net loss guidance is $1 billion to $1.1 billion. And for taxes, we expect our effective corporate tax rate to be in the 36% to 37% range at strip prices. and that's excluding any one-time items. And that's with an effective cash tax rate in the 33% to 34% range. For capital spending, our full year guidance range is between $11 billion to $11.5 billion, which includes $200 million to $300 million of capitalized interest.
Now on Slide 8 of the presentation, we provided a bridge from 2023 to 2024 with some of the key year-over-year variables, most of which we've discussed on prior earnings calls. These include our expectation of $200 million to $300 million in deflation benefits, primarily in the Lower 48. $200 million to $300 million of lower spending in Norway following the startup of our four subsea tieback projects, and $500 million to $600 million in lower LNG spending, mostly at Port Arthur. These decreases are offset by $900 million to $1 billion increase at Willow, and a $100 million to $200 million increase in Canada to account for the acquisition of the remaining 50% of Surmont and the addition of a second rig in the Montney.
For Willow, we expect spending to be more heavily weighted to the first quarter, and this is consistent with the normal timing of winter construction season. And for Port Arthur, we expect that our $400 million of equity contributions in 2024 will also be weighted towards the first half of the year. Now as a result, first quarter capex could be a bit above $3 billion.
So to wrap up, we ended the year with another solid operational quarter. We continue to deliver on our strategic initiatives across our deep, durable and diverse portfolio. And we remain highly competitive on our shareholder distributions.
Now that concludes our prepared remarks. I'll turn it back over to the operator to start the Q&A.