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Taxation (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized Tax Benefits, beginning of year $ 27us-gaap_UnrecognizedTaxBenefits $ 26us-gaap_UnrecognizedTaxBenefits
Additions based on tax provisions related to the current year 2us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 5us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reductions for the lapse of the applicable statutes of limitations (6)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (4)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Unrecognized Tax Benefits, end of year $ 23us-gaap_UnrecognizedTaxBenefits $ 27us-gaap_UnrecognizedTaxBenefits