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Shareholders' Equity (Shareholders' Equity, Accumulated Other Comprehensive Loss, Common Stock, and Preferred Stock) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Issued |  | 1,066,000,000 | 1,068,000,000
In treasury |  | (181,000,000) | (190,000,000)
Total shares of common stock outstanding |  | 885,000,000 | 878,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Defined benefit and other postretirement liability adjustments | [1] | $ (226,000,000) | $ (214,000,000)
Cumulative translation adjustment |  | (83,000,000) | (82,000,000)
Other |  | (53,000,000) | (66,000,000)
Total accumulated other comprehensive loss |  | $ (362,000,000) | $ (362,000,000)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Stock Repurchased During Period, Shares |  | 7,400,000 | 4,500,000
Treasury Stock, Value, Acquired, Cost Method |  | $ 100,000,000 |
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 |  | $ 9,000,000,000.0 |
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 |
Foreign Plan [Member] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Net actuarial losses |  | $ 212,000,000 | $ 189,000,000
[1] | Included net actuarial losses for our international pension plans of $212 million at December 31, 2020 and $189 million at December 31, 2019.

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