v3.7.0.1
Fixed Assets - Summary of Fixed Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Abstract]    
Property, plant & equipment $ 39,857 $ 40,008
Less: Accumulated depreciation 27,350 27,187
Fixed assets less accumulated depreciation $ 12,507 $ 12,821