Derivative Instruments and Hedging Activities - Impact of Changes in Fair Value of Interest Rate Swaps and Underlying Hedged Items on Results of Operations (Detail) (Interest Rate Swaps [Member], Interest Expense [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Swap [Member]
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Derivatives, Fair Value [Line Items] | |||
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments | $ (1) | $ 35 | |
Senior Notes [Member]
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Derivatives, Fair Value [Line Items] | |||
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | $ 1 | $ (35) |