Long-term Debt and Interest Expense - Interest Costs (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amortization of issuance discount (a)	$ (4)	$ 29	$ 1
Amortization of capitalized loan fees	14	5	$ 4
0.250% convertible senior notes due 2025
Debt Instrument [Line Items]
Contractual coupon interest	3	2
Amortization of issuance discount (a)	0	28
Amortization of capitalized loan fees	5	2
Total interest expense on convertible notes	$ 8	$ 32

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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