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Equity Equity (Stock Repurchases) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 90 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 246 |  |  | $ 246
Treasury Stock, Shares | 155,924,785 | 156,878,891 |  | 155,924,785
Acquisition of treasury stock (shares) | 0 |  |  | 154,300,000
Payments for Repurchase of Common Stock | $ 0 | $ 79 | $ 482 |
Treasury Stock Acquired, Average Cost Per Share |  |  |  | $ 12.12
Treasury Stock, Value, Acquired, Cost Method |  |  |  | $ 1,900

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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