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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 | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Total number of shares repurchased (shares) | 7.6 | 14.4 | 15.6 | 22.1 |
Aggregate cost of shares repurchased | $ 437 | $ 1,049 | $ 950 | $ 1,600 | $ 2,917
Average price per share of shares repurchased (usd per share) | $ 57.65 | $ 72.85 | $ 61.07 | $ 72.47 |

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