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Consolidated Statements of Income (Parenthetical) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Consolidated Statements of Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to participating share awards | $ 11 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 11 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 12 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 12 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 11 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 12 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 13 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 11 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 46 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 47 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | $ 49 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Details
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