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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 | 28 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Feb. 26, 2018 | Feb. 23, 2017 | Feb. 24, 2016
Stock Repurchases [Line Items] |  |  |  |  |  |
Shares Repurchased and Retired During Period, Shares | 4.1 | 7.8 | 24.3 |  |  |
Shares Repurchased and Retired During Period, Value | $ 101 | $ 200 | $ 674 |  |  |
Weighted Average Market Price of Shares Repurchased and Retired During Period | $ 24.94 | $ 25.73 | $ 27.80 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 251 | $ 251 | $ 251 |  |  |
Maximum | 2016 Stock Repurchase Plan |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |
Shares Authorized under Stock Repurchase Program, |  |  |  |  |  | $ 275
Maximum | 2017 Stock Repurchase Plan |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |
Shares Authorized under Stock Repurchase Program, |  |  |  |  | $ 300 |
Maximum | 2018 Stock Repurchase Plan |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |
Shares Authorized under Stock Repurchase Program, |  |  |  | $ 350 |  |

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