Shareholders' Equity (Shareholders' Equity, Accumulated Other Comprehensive Loss, Common Stock, and Preferred Stock) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Issued		1,066,000,000	1,066,000,000
In treasury		(170,000,000)	(181,000,000)
Total shares of common stock outstanding		896,000,000	885,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	[1]	$ (47,000,000)	$ (226,000,000)
Other		(51,000,000)	(53,000,000)
Accumulated other comprehensive loss		(183,000,000)	$ (362,000,000)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock Repurchased During Period, Shares			7,400,000
Stock authorized to repurchase		$ 5,100,000,000
Number of shares of common stock repurchased from inception (in shares)		224,000,000
Approximate value of shares of common stock repurchased from inception		$ 9,000,000,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Number of shares of preferred stock that are authorized for issuance (in shares)		5,000,000
Number of shares preferred stock that are issued at period end (in shares)		0
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax		$ (85,000,000)	$ (83,000,000)
Stock plans		264,000,000	285,000,000	$ 348,000,000
Retained Earnings
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock plans		(277,000,000)	(75,000,000)	$ 0
Foreign Plan [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net actuarial losses		$ 49,000,000	$ 212,000,000

[1] Included net actuarial losses for our international pension plans of $49 million at December 31, 2021 and $212 million at December 31, 2020.