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Common Stock - Summary of Information of Stock Options Exercised (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common Stock [Abstract]      
Aggregate value $ 3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue [1] $ 4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue [1] $ 19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue [1]
Cash received for exercise price $ 7us-gaap_ProceedsFromStockOptionsExercised $ 19us-gaap_ProceedsFromStockOptionsExercised $ 47us-gaap_ProceedsFromStockOptionsExercised
[1] Includes stock options issued to retirement eligible employees.