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Interest Expense
 12 Months Ended
Dec. 31, 2021
Interest Expense [Abstract]  
Interest Expense Interest Expense
Details of interest expense are as follows:
 Year ended December 31,
 202120202019
 (in millions)
Interest on borrowings(1)
$175 $185 $223 
Fees on financing agreements(1)
9 8 13 
Interest on tax liabilities(2)
1 (14)3 
Interest capitalized(1)— (2)
Interest expense$184 $179 $237 
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(1)See Note 13—Financing Agreements for additional information.
(2)Interest on tax liabilities for the year ended December 31, 2020 includes a reduction in interest accrued on the reserve for unrecognized tax benefits.