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Basis Of Presentation Stock Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 16 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2017 | Feb. 23, 2017 | Feb. 24, 2016
Stock Repurchases [Line Items] |  |  |  |  |
Shares Repurchased and Retired During Period, Shares | 1.9 | 4.1 | 11.2 |  |
Shares Repurchased and Retired During Period, Value | $ 60 | $ 120 |  |  |
Weighted Average Market Price of Shares Repurchased and Retired During Period | $ 30.22 | $ 28.97 | $ 28.33 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 256 | $ 256 | $ 256 |  |
Maximum |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |
Shares Authorized under Stock Repurchase Program, |  |  |  | $ 300 | $ 275
2016 Stock Repurchase Plan [Member] |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |
Shares Repurchased and Retired During Period, Value |  |  | 275 |  |
2017 Stock Repurchase Plan [Member] |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |
Shares Repurchased and Retired During Period, Value |  |  | $ 44 |  |

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