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Debt - Convertible Notes (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes		4.875%
Loss (gain) on debt repayment		$ (15)	$ 15	$ (22)
Debt repayment		$ (15)
Convertible Debt | 1.125% Convertible Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes	1.125%	1.125%	1.125%
Repayments of debt	$ 39	$ 39
Current portion of long-term debt	$ 12	$ 0	$ 12

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- Definition

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+ References

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- Definition

Long-Term Debt, Current Maturities, Net Of Unamortized Premium (Discount)

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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