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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.

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