Debt - Convertible Senior Notes Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) day	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Shareholders equity	$ 4,526	$ 4,482	$ 5,341	$ 4,742
Gain (loss) on extinguishment of debt	$ 1	0	(17)
Convertible Debt
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			(17)
Convertible Senior Notes Due 2024, 2025, 2026 | Convertible Debt
Debt Instrument [Line Items]
Repurchase price percentage of principal amount	100.00%
Debt instrument, convertible threshold percentage	130.00%
Debt instrument, convertible threshold trading days | day	20
Debt instrument, threshold consecutive trading days | day	30
2.75% convertible senior notes due 2025
Debt Instrument [Line Items]
Debt instrument, repurchased face amount	$ 58
Repayments of convertible debt	57
Gain (loss) on extinguishment of debt	1
Accumulated Deficit
Debt Instrument [Line Items]
Shareholders equity	$ (1,770)	$ (1,612)	(1,667)	$ (1,139)
Cumulative-effect adjustment from adoption of guidance on accounting for convertible instruments and contracts in an entity’s own equity
Debt Instrument [Line Items]
Shareholders equity			(336)
Cumulative-effect adjustment from adoption of guidance on accounting for convertible instruments and contracts in an entity’s own equity | Accumulated Deficit
Debt Instrument [Line Items]
Shareholders equity			$ 156