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Background and Basis of Presentation (Share Repurchase Table) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 33 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Repurchase of common stock (shares) |  | 8.0 |  |  |
Aggregate cost of shares repurchased |  | $ 513 |  | $ 2,917 |
Average price of repurchased shares, per share (usd per share) |  | $ 64.33 |  |  |
July 2015 Share Repurchase Program [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Repurchase of common stock (shares) | 0.3 |  | 7.7 |  | 58.7
Aggregate cost of shares repurchased | $ 18 |  | $ 551 |  |
Average price of repurchased shares, per share (usd per share) | $ 71.68 |  | $ 71.77 |  | $ 68.15

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