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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 5,640	$ 5,596	$ 5,686
Carrying/fair value of investments not included in cash and cash equivalents	1,155	1,141
Carrying amount of long-term debt	25,676
Carrying Amount of Long-term Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amount of long-term debt	22,164	30,805
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amount of long-term debt	$ 23,670	34,390
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity period of primarily bank time deposits, classified as cash equivalents, maximum	90 days
Nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets at fair value	$ 140	3,889
Level 3 | Nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets at fair value	140	2,451
Level 1 | Corporate Bond Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	22,835
Level 1 | Nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets at fair value	0	0
Level 2 | Other Long-term Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	835
Level 2 | Nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets at fair value	$ 0	$ 1,438

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