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Shareholders' Equity And Net Income Per Share Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share Repurchase Program [Line Items] |  |  |
Stock Repurchased During Period, Shares | 6,530,369 | 4,667,193 | 9,481,946
Stock Repurchased, Average Price | $ 76.44 | $ 82.00 | $ 66.93
Stock Repurchased During Period, Value | $ 499 | $ 383 | $ 635
Share Repurchase Program April 2016 |  |  |
Share Repurchase Program [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount | 1,500 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 490 |  |
Share Repurchase Program January 2015 |  |  |
Share Repurchase Program [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount | 1,500 |  |
Share Repurchase Program January 2019 [Member] |  |  |
Share Repurchase Program [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount | $ 2,000 |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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