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Schedule of Cash Flow Hedges Effect on Accumulated Other Comprehensive Income, Net of Taxes (Detail) (Cash Flow Hedges, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flow Hedges
      
Derivative Instruments, Gain (Loss) [Line Items]      
Accumulated gain / (loss) at beginning of period $ (38) $ (297) $ 79
Transfer of realized (gains) / losses in fair value to earnings 53 312 118
Unrealized gain / (loss) in fair value 102 (75) (444)
Discontinued operations   (134) (50)
Impact of Spin-Off   156  
Accumulated gain / (loss) at ending of period $ 117 $ (38) $ (297)