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Equity Equity (Stock Repurchases) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 114 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 264 | $ 264 |
Treasury Stock, Shares | 153,891,260 | 153,891,260 | 154,905,595
Acquisition of treasury stock (shares) | 0 | 154,300,000 |
Treasury Stock Acquired, Average Cost Per Share |  | $ 12.12 |
Treasury Stock, Value, Acquired, Cost Method |  | $ 1,900 |

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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