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Capital Stock (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 66 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 14, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Feb. 02, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash dividends paid |  |  |  | $ 67,000,000 | $ 50,000,000 |  |
Cash dividends declared (dollars per share) |  | $ 0.14 | $ 0.10 | $ 0.28 | $ 0.2 |  |
Payments for repurchase of stock |  |  |  | $ 100,000,000 | $ 30,000,000 |  |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash dividends paid |  |  |  | $ 67,000,000 |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 2,100,000,000.0
Shares repurchased (shares) |  | 2,976,414 |  | 3,851,092 |  | 47,820,749 |
Average price of shares repurchased (dollars per share) |  | $ 25.20 |  | $ 25.97 |  | $ 29.56 |
Payments for repurchase of stock |  | $ 75,000,000 |  | $ 100,000,000 |  | $ 1,413,000,000 |
Common Stock | Payments for Share Repurchases Related to Employee Stock Based Compensation |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (shares) |  |  |  | 0 |  |  |
Common Stock | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash dividends declared (dollars per share) | $ 0.14 |  |  |  |  |  |
Cash dividends declared | $ 33,000,000 |  |  |  |  |  |

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