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Quarterly Supplementary Data (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 1,262us-gaap_Revenues $ 1,280us-gaap_Revenues $ 1,214us-gaap_Revenues $ 1,189us-gaap_Revenues $ 1,172us-gaap_Revenues $ 1,152us-gaap_Revenues $ 1,104us-gaap_Revenues $ 1,103us-gaap_Revenues $ 4,945us-gaap_Revenues $ 4,531us-gaap_Revenues $ 4,111us-gaap_Revenues
Income before income taxes 236us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 259us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 107us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 119us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 167us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 182us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 148us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 217us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 721us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 714us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 566us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net Income (Loss) Attributable to Parent $ 167us-gaap_NetIncomeLoss $ 183us-gaap_NetIncomeLoss $ 84us-gaap_NetIncomeLoss $ 91us-gaap_NetIncomeLoss $ 122us-gaap_NetIncomeLoss $ 131us-gaap_NetIncomeLoss $ 110us-gaap_NetIncomeLoss $ 154us-gaap_NetIncomeLoss $ 525us-gaap_NetIncomeLoss $ 517us-gaap_NetIncomeLoss $ 421us-gaap_NetIncomeLoss
Basic (in usd per share) $ 1.03us-gaap_EarningsPerShareBasic $ 1.12us-gaap_EarningsPerShareBasic $ 0.51us-gaap_EarningsPerShareBasic $ 0.56us-gaap_EarningsPerShareBasic $ 0.75us-gaap_EarningsPerShareBasic $ 0.80us-gaap_EarningsPerShareBasic $ 0.67us-gaap_EarningsPerShareBasic $ 0.95us-gaap_EarningsPerShareBasic $ 3.21us-gaap_EarningsPerShareBasic $ 3.16us-gaap_EarningsPerShareBasic $ 2.59us-gaap_EarningsPerShareBasic
Diluted (in usd per share) $ 1.02us-gaap_EarningsPerShareDiluted $ 1.11us-gaap_EarningsPerShareDiluted $ 0.51us-gaap_EarningsPerShareDiluted $ 0.55us-gaap_EarningsPerShareDiluted $ 0.74us-gaap_EarningsPerShareDiluted $ 0.79us-gaap_EarningsPerShareDiluted $ 0.66us-gaap_EarningsPerShareDiluted $ 0.94us-gaap_EarningsPerShareDiluted $ 3.18us-gaap_EarningsPerShareDiluted $ 3.12us-gaap_EarningsPerShareDiluted $ 2.57us-gaap_EarningsPerShareDiluted