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Background and Basis of Presentation (Share Repurchase Table) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Total number of shares repurchased (shares) | 6.2 | 11.1 | 21.8 | 33.2 |
Aggregate cost of shares repurchased | $ 367 | $ 759 | $ 1,317 | $ 2,359 | $ 2,917
Average price per share of shares repurchased (usd per share) | $ 59.18 | $ 67.99 | $ 60.53 | $ 70.97 |

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