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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
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash Flow Hedges
   
Derivative Instruments, Gain (Loss) [Line Items]    
Accumulated gain / (loss) at beginning of period $ 117 $ (38)
Transfer of realized losses / (gains) in fair value to earnings (1) 17
Unrealized gain / (loss) in fair value (34) 21
Accumulated gain / (loss) at ending of period $ 82