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Shareholders' Equity - Participating Securities (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity [Abstract]      
Income from continuing operations $ 12us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarnings $ 11us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarnings $ 11us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarnings
Number of shares excluded from the calculation of diluted earnings per share 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount