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Shareholders' Equity (Changes in Capital Stock) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance, common stock shares (in shares) | 1,708.0 |  |  |
Balance, treasury stock shares (in shares) | (850.0) |  |  |
Shares purchased for treasury, treasury stock shares (in shares) |  | (84.4) |  | (197.1)
Balance, common stock shares (in shares) | 1,713.0 | 1,708.0 |  |
Balance, treasury stock shares (in shares) | (925.0) | (850.0) |  |
Balance, common stock par value | $ 854 |  |  |
Balance, treasury stock cost | (16,633) |  |  |
Shares issued to benefit plans and for option exercises | 126 | $ 355 |  | $ 182
Purchase of common stock for treasury | (2,230) | (2,448) |  | (4,244)
Other, net | (13) | 196 | [1] | $ (28)
Balance, common stock par value | 857 | 854 |  |
Balance, treasury stock cost | $ (18,870) | $ (16,633) |  |
Common Stock [Member] |  |  |  |
Balance, common stock shares (in shares) | 1,708.0 | 1,691.0 |  | 1,681.0
Shares issued to benefit plans and for option exercises, common stock shares (in shares) | 5.0 | 17.0 |  | 10.0
Balance, common stock shares (in shares) | 1,713.0 | 1,708.0 |  | 1,691.0
Balance, common stock par value | $ 854 | $ 846 |  | $ 840
Shares issued to benefit plans and for option exercises | 3 | 8 |  | 6
Balance, common stock par value | $ 857 | $ 854 |  | $ 846
Treasury Stock [Member] |  |  |  |
Balance, treasury stock shares (in shares) | (850.0) | (765.0) |  | (551.0)
Shares purchased for treasury, treasury stock shares (in shares) | (75.0) | (84.0) |  | (214.0)
Other, net, treasury stock shares (in shares) |  | (1.0) |  |
Balance, treasury stock shares (in shares) | (925.0) | (850.0) |  | (765.0)
Balance, treasury stock cost | $ (16,633) | $ (14,152) |  | $ (9,725)
Shares issued to benefit plans and for option exercises |  | (2) |  | (2)
Purchase of common stock for treasury | (2,230) | (2,462) |  | (4,409)
Other, net | (7) | (17) | [1] | (16)
Balance, treasury stock cost | $ (18,870) | $ (16,633) |  | $ (14,152)
[1] | Adjustment to retained earnings includes the cumulative effect of the accounting change we recorded upon adoption of ASU 2016-09 in 2017 in the amount of $233 million.

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