Financing Activities - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2022 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($)	May 01, 2020 USD ($) $ / shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Initial conversion price (in USD per share) | $ / shares								$ 38.48
Decrease in AOCI	$ (11,120,000,000)	$ (9,688,000,000)	$ (11,120,000,000)	$ (9,688,000,000)	$ (10,417,000,000)		$ (10,414,000,000)	$ (9,093,000,000)	$ (8,876,000,000)
Payments of long-term debt and finance lease obligations	53,000,000	43,000,000	146,000,000	109,000,000
Interest expense	93,000,000	116,000,000	186,000,000	229,000,000
Capital in excess of par value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Decrease in AOCI	(3,966,000,000)	(4,269,000,000)	$ (3,966,000,000)	(4,269,000,000)	$ (3,940,000,000)		(4,224,000,000)	$ (4,220,000,000)	(4,191,000,000)
Cumulative Effect, Period of Adoption, Adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Decrease in AOCI							245,000,000		$ 0
Cumulative Effect, Period of Adoption, Adjustment | Capital in excess of par value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Decrease in AOCI							$ 300,000,000
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Capital in excess of par value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Decrease in AOCI						$ 300,000,000
Convertible Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount										$ 2,300,000,000
Stated interest rate										1.25%
Initial conversion price (in USD per share) | $ / shares										$ 38.48
Amortization period (in years)			5 years
Hedged items	$ 9,000,000	$ 28,000,000	$ 19,000,000	$ 56,000,000
Initial conversion ratio	0.0259909
Convertible Debt | Accounting Standards Update 2020-06
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net carrying amount						$ 300,000,000
Convertible Debt | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Stated interest rate						1.25%
Convertible Debt | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Capital in excess of par value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Decrease in AOCI						$ 300,000,000
Notes Due 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effective interest rate	1.90%		1.90%
Convertible Debt And Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments of long-term debt and finance lease obligations	$ 231,000,000		$ 555,000,000
Line of Credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net carrying amount	0		0
Borrowing capacity	$ 1,000,000,000		$ 1,000,000,000