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Aggregate Debt Maturities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
2014 $ 332  
2015 858 [1]  
2016 408 [2]  
2017 540  
2018     
Thereafter 2,650  
Debt principal outstanding 4,788  
Unamortized (discounts) premiums, net (32)  
Fair value hedge adjustment 1  
Capital lease obligations 2  
Total debt $ 4,759 $ 5,411
[1] Includes $225 million outstanding under the credit facility that was repaid in January 2014.
[2] Includes $150 million Series Q senior notes that were repaid in February 2014.