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Shareholders' Equity (Shareholders' Equity, Accumulated Other Comprehensive Loss, Common Stock, and Preferred Stock) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |
Stock Repurchased During Period, Shares |  | 10,500,000 | 0
Treasury Stock, Value, Acquired, Cost Method |  | $ 400,000,000 |
Issued |  | 1,069,000,000 | 1,069,000,000
In treasury |  | (198,000,000) | (196,000,000)
Total shares of common stock outstanding |  | 871,000,000 | 873,000,000
Defined benefit and other postretirement liability adjustments | [1] | $ (203,000,000) | $ (334,000,000)
Cumulative translation adjustment |  | (82,000,000) | (80,000,000)
Other |  | (70,000,000) | (55,000,000)
Total accumulated other comprehensive loss |  | (355,000,000) | (469,000,000)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Stock authorized to repurchase |  | $ 5,300,000,000 |
Number of shares of common stock repurchased from inception (in shares) |  | 212,000,000 |
Approximate value of shares of common stock repurchased from inception |  | $ 8,800,000,000 |
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 |
Foreign Plan [Member] |  |  |
Class of Stock [Line Items] |  |  |
Net actuarial losses |  | $ 184,000,000 | $ 295,000,000
[1] | Included net actuarial losses for our international pension plans of $184 million at December 31, 2018 and $295 million at December 31, 2017.

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