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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
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Total number of shares repurchased (shares) | 0.0 | 6.2 | 6.4 | 21.8
Aggregate cost of shares repurchased | $ 0 | $ 367 | $ 346 | $ 1,317
Average price per share of shares repurchased (usd per share) | $ 0 | $ 59.18 | $ 54.36 | $ 60.53

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