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Common Stock (Details) - USD ($) shares in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Payments for repurchase of common stock | $ 900,000,000 | $ 800,000,000 | $ 1,400,000,000 |
Shares issued in period | 5.8 | 5.3 |  |
Common Stock |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock repurchased (in shares) | 11.5 | 12.7 |  |
Stock repurchase program, authorized amount |  |  |  | $ 2,500,000,000.0
Stock repurchase program, remaining authorized repurchase amount | $ 1,500,000,000 |  |  |

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