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Long-term Debt and Finance Leases - Senior Notes Issuance and Redemptions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Mar. 09, 2023
Debt Instrument [Line Items]
Principal repurchased			$ 1,855,000,000
Repayment of senior notes			1,949,000,000
Gain/(Loss) on debt extinguishment	$ 109,000,000	$ 0	(77,000,000)
Senior Notes
Debt Instrument [Line Items]
Write off of deferred debt issuance cost			12,000,000
Senior Secured First Lien Notes, due 2033 | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount				$ 740,000,000
Interest rate, stated percentage				7.00%
Senior Notes, due 2032 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.875%
Principal repurchased	$ 620,000,000
Repayment of senior notes	509,000,000
Payment of accrued interest	$ 7,000,000
Average early redemption percentage	81.00%
Gain/(Loss) on debt extinguishment	$ 109,000,000
Write off of deferred debt issuance cost	$ 9,000,000
Senior Notes | Senior Notes
Debt Instrument [Line Items]
Principal repurchased			1,900,000,000
Repayment of senior notes			1,900,000,000
Gain/(Loss) on debt extinguishment			$ 77,000,000

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