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Interest Expense
 12 Months Ended
Dec. 31, 2024
Interest Expense, Operating and Nonoperating [Abstract]  
Interest Expense Interest Expense
Details of interest expense are as follows:
 Year ended December 31,
 202420232022
 (in millions)
Interest on borrowings(1)
$150 $150 $155 
Fees on financing agreements(1)
9 8 8 
Interest on tax liabilities(2)
(27)(2)184 
Interest capitalized(11)(6)(3)
Interest expense$121 $150 $344 
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(1)See Note 14—Financing Agreements for additional information.
(2)Interest on tax liabilities for the year ended December 31, 2024 primarily relates to discretionary interest relief granted from the CRA and the Alberta TRA. Interest on tax liabilities for the year ended December 31, 2022 consists primarily of interest accrued on reserves for unrecognized tax benefits related to Canadian transfer pricing.