New Accounting Pronouncements (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Mar. 31, 2022	Jan. 01, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	May 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI	$ 10,924,000,000	$ 10,250,000,000	$ 10,924,000,000	$ 10,250,000,000	$ 11,120,000,000	$ 10,417,000,000		$ 10,414,000,000	$ 9,688,000,000	$ 9,093,000,000	$ 8,876,000,000
Net income	$ (277,000,000)	$ (446,000,000)	$ (759,000,000)	$ (909,000,000)
Diluted (in USD per share)	$ 0.44	$ 0.73	$ 1.21	$ 1.49
Capital in excess of par value
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI	$ 3,989,000,000	$ 4,251,000,000	$ 3,989,000,000	$ 4,251,000,000	3,966,000,000	3,940,000,000		4,224,000,000	4,269,000,000	4,220,000,000	4,191,000,000
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI	16,588,000,000	$ 15,706,000,000	16,588,000,000	$ 15,706,000,000	$ 16,311,000,000	$ 15,551,000,000		15,774,000,000	$ 15,260,000,000	$ 14,912,000,000	14,777,000,000
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI								(245,000,000)			0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income	$ 36,000,000		$ 94,000,000
Diluted (in USD per share)	$ 0.08		$ 0.22
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								(300,000,000)
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							$ (300,000,000)
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI								$ 55,000,000			$ 19,000,000
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							55,000,000
Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stated interest rate												1.25%
Convertible Debt | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net carrying amount							$ 300,000,000
Convertible Debt | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stated interest rate							1.25%
Convertible Debt | 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							$ (300,000,000)
Line of Credit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Borrowing capacity	$ 1,000,000,000		$ 1,000,000,000
Net carrying amount	$ 0		$ 0