Consolidated Statement of Stockholder's Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Capital in excess of par value	Capital in excess of par value Cumulative Effect, Period of Adoption, Adjusted Balance	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Retained earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated other comprehensive income (loss)	Accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury stock	Treasury stock Cumulative Effect, Period of Adoption, Adjusted Balance
Balance at beginning of period at Dec. 31, 2018	$ 9,853	$ 55	$ 9,908	$ 808	$ 808	$ 1,510	$ 1,510	$ 15,967	$ 55	$ 16,022	$ 20		$ 20	$ (8,452)	$ (8,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	(2,000)													(2,000)
Issuance of common and treasury stock pursuant to Employee stock plans	27					16								11
Share-based compensation	55					55
Cash dividends	(377)							(377)
Comprehensive income (loss)	2,219							2,300			(81)
Balance at end of period at Dec. 31, 2019	9,832			808		1,581		17,945			(61)			(10,441)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	(451)													(451)
Issuance of common stock, net of issuance costs	2,224			80		2,144
Issuance of common and treasury stock pursuant to Employee stock plans	34					17								17
Share-based compensation	17					17
Cash dividends	(94)							(94)
Stock warrants	40					40
Equity feature of convertible notes, net of issuance costs	(392)					(392)
Comprehensive income (loss)	(3,118)							(3,074)			(44)
Balance at end of period at Dec. 31, 2020	8,876	$ 0		888		4,191		14,777	$ 20		(105)	$ (20)		(10,875)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common and treasury stock pursuant to Employee stock plans	37					22								15
Share-based compensation	58					58
Stock warrants	45					45
Equity feature of partial extinguishment of convertible notes	(92)					(92)
Comprehensive income (loss)	1,490							977			513
Balance at end of period at Dec. 31, 2021	$ 10,414			$ 888		$ 4,224		$ 15,774			$ 388			$ (10,860)