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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 | 18 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Jun. 30, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |
Aggregate cost of shares repurchased |  | $ 346 |
January 2018 Share Repurchase Program [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Total number of shares repurchased (shares) | 0.0 | 6.4 | 34.0
Aggregate cost of shares repurchased | $ 0 | $ 346 |
Average price per share of shares repurchased (usd per share) | $ 0 | $ 54.36 | $ 58.86

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