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Accumulated Other Comprehensive Income (Loss) - Summary of Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]  
Accumulated other comprehensive income (loss), Beginning balance   
Accumulated other comprehensive income (loss) before reclassifications (45)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
Amounts reclassified from accumulated other comprehensive income (loss) 0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Accumulated other comprehensive income (loss), Ending balance $ (45)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax