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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Cash Flow Hedges
       
Derivative Instruments, Gain (Loss) [Line Items]        
Accumulated gain / (loss) at beginning of period $ 44 $ 72 $ 117 $ (38)
Transfer of realized losses / (gains) in fair value to earnings (17) 6 (20) 38
Unrealized gain / (loss) in fair value 47 4 (23) 82
Accumulated gain / (loss) at end of period $ 74 $ 82 $ 74 $ 82