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Aggregate Maturities of Debt Based on Stated Contractual Maturities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Debt Instrument [Line Items]  
2014 $ 999
2015 1,720
2016 1,760
2017 1,621
2018 1,731
Thereafter 7,682
Total $ 15,513