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Interest Expense
 9 Months Ended
Sep. 30, 2021
Interest Expense [Abstract]  
Interest Expense Interest Expense
Details of interest expense are as follows:
 Three months ended 
 September 30,		Nine months ended 
 September 30,
 2021202020212020
 (in millions)
Interest on borrowings(1)
$43 $46 $133 $139 
Fees on financing agreements(1)
3 2 7 6 
Interest on tax liabilities(2)
— — — (4)
Total interest expense$46 $48 $140 $141 
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(1)See Note 12—Financing Agreements for additional information.
(2)Interest on tax liabilities for the nine months ended September 30, 2020 consists of a reduction in interest accrued on the reserve for unrecognized tax benefits.