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Equity Stock Repurchase Program (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 57 Months Ended | 1 Months Ended | 58 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | May 08, 2015 | May 08, 2015 | Dec. 31, 2014
Equity [Abstract] |  |  |  |  |  |
Treasury stock, shares (in shares) | 112,188,349 us-gaap_TreasuryStockShares |  | 112,188,349 us-gaap_TreasuryStockShares |  |  | 110,687,849 us-gaap_TreasuryStockShares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares | 2,816,493 us-gaap_TreasuryStockSharesAcquired |  | 108,728,970 us-gaap_TreasuryStockSharesAcquired |  |  |
Stock Repurchased During Period, Value | $ 35 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 0 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 1,300 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 388 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  | 388 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 12.37 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  |  | 591,028 us-gaap_TreasuryStockSharesAcquired / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 109,319,998 us-gaap_TreasuryStockSharesAcquired / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Stock Repurchased During Period, Value |  |  |  | 7 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 1,400 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 381 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 381 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  | $ 12.38 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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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://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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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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