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Related Party Transactions and Net Parent Company Investment - Schedule of Components of the Net Transfers to and from Parents (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Related Party Transaction [Abstract]    
Net contributions from parent company per the combined changes in net parent company investment $ 119 $ 49
Less: Net income (41) (41)
Contributions from parent company per the combined statements of cash flows $ 78 $ 8