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Capital Stock (Details) - USD ($) |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 48 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 10, 2017 | Sep. 01, 2017 | Jul. 12, 2017 | Dec. 01, 2016 | Sep. 07, 2016 | Sep. 01, 2016 | Jul. 12, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Feb. 02, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared (dollars per share) |  |  | $ 0.10 |  | $ 0.10 |  | $ 0.07 | $ 0.10 | $ 0.17 | $ 0.30 | $ 0.31 |  |  |  |
Dividends paid (dollars per share) |  | $ 0.10 |  | $ 0.10 |  | $ 0.07 |  |  |  |  |  |  | $ 0.31 |  |
Cash dividends paid |  |  |  |  |  |  |  |  |  | $ 75,000,000 | $ 56,000,000 |  |  |  |
Payments for repurchase of stock |  |  |  |  |  |  |  |  |  | 205,000,000 | 200,000,000 |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid (dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.44 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  |  | $ 75,000,000 | $ 56,000,000 |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,100,000,000.0
Shares repurchased (shares) |  |  |  |  |  |  |  | 5,592,239 |  | 6,435,359 |  |  |  | 37,649,469 |
Average price of shares repurchased (dollars per share) |  |  |  |  |  |  |  | $ 31.29 |  | $ 31.88 |  |  |  | $ 29.71 |
Payments for repurchase of stock |  |  |  |  |  |  |  | $ 175,000,000 |  | $ 205,000,000 |  |  |  | $ 1,118,000,000 |
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 | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in cash dividends declared (dollars per share) | $ 0.04 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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