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Interest Expense
 12 Months Ended
Dec. 31, 2023
Interest Expense [Abstract]  
Interest Expense Interest Expense
Details of interest expense are as follows:
 Year ended December 31,
 202320222021
 (in millions)
Interest on borrowings(1)
$150 $155 $175 
Fees on financing agreements(1)
8 8 9 
Interest on tax liabilities(2)
(2)184 1 
Interest capitalized(6)(3)(1)
Interest expense$150 $344 $184 
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(1)See Note 14—Financing Agreements for additional information.
(2)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.