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Fixed Assets - Depreciation Expense Charged to Income (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Property Plant And Equipment [Abstract]        
Depreciation expense relating to fixed assets $ 821 $ 788 $ 2,414 $ 2,324