New Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Jan. 01, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	May 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI	$ 11,120	$ 9,688	$ 11,120	$ 9,688	$ 10,417		$ 10,414	$ 9,093	$ 8,876
Net income	$ (760)	$ (348)	$ (482)	$ (463)
Diluted (in USD per share)	$ 1.20	$ 0.57	$ 0.77	$ 0.76
Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stated interest rate										1.25%
Accounting Standards Update 2020-06 | Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net carrying amount						$ 300
Capital in excess of par value
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI	$ 3,966	$ 4,269	$ 3,966	$ 4,269	3,940		4,224	4,220	4,191
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI	16,311	$ 15,260	16,311	$ 15,260	$ 15,551		15,774	$ 14,912	14,777
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI							(245)		0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income	$ 21		$ 57
Diluted (in USD per share)	$ (0.20)		$ (0.21)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stated interest rate						1.25%
Cumulative Effect, Period of Adoption, Adjustment | Capital in excess of par value
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI							(300)
Cumulative Effect, Period of Adoption, Adjustment | Capital in excess of par value | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI						$ (300)
Cumulative Effect, Period of Adoption, Adjustment | Capital in excess of par value | Accounting Standards Update 2020-06 | Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI						(300)
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI							$ 55		$ 19
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI						$ 55