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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
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Total number of shares repurchased (shares) | 3.7 | 7.6 | 6.4 | 15.6
Aggregate cost of shares repurchased | $ 195 | $ 437 | $ 346 | $ 950
Average price per share of shares repurchased (usd per share) | $ 52.93 | $ 57.65 | $ 54.36 | $ 61.07

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