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Fair Value of Financial Instruments - Carrying Amounts (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021
Fair value disclosure
Loss on equity securities	$ (83)		$ (83)
Loss on investments	(43)	$ (9)	(114)	$ (9)
Fair Value, Inputs, Level 1 | Carrying Amount
Fair value disclosure
Equity securities	47		47			$ 0
Fair Value, Inputs, Level 1 | Fair Value
Fair value disclosure
Equity securities	47		47			0
Fair Value Inputs, Level 2 | Carrying Amount
Fair value disclosure
Long-term debt, excluding finance lease and other obligations	24,914		24,914			28,635
Interest rate swap contracts (see Note 11)	0		0			25
Fair Value Inputs, Level 2 | Carrying Amount | Disposal Group, Held-for-sale, Not Discontinued Operations
Fair value disclosure
Long-term debt, excluding finance lease and other obligations	1,400		1,400			1,400
Fair Value Inputs, Level 2 | Fair Value
Fair value disclosure
Long-term debt, excluding finance lease and other obligations	21,934		21,934			29,221
Interest rate swap contracts (see Note 11)	0		0			25
Fair Value Inputs, Level 2 | Fair Value | Disposal Group, Held-for-sale, Not Discontinued Operations
Fair value disclosure
Long-term debt, excluding finance lease and other obligations	700		700			1,600
Fair Value, Inputs, Level 3 | Carrying Amount
Fair value disclosure
Indemnifications related to the sale of the Latin American business	86		86			0
Fair Value, Inputs, Level 3 | Fair Value
Fair value disclosure
Indemnifications related to the sale of the Latin American business	86		86			0
Net Asset Value
Fair value disclosure
Investment in limited partnership					$ 130
Net Asset Value | Fair Value
Fair value disclosure
Investment in limited partnership	$ 55		$ 55			$ 299

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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