Fixed Assets - Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Line Items]
Property, plant and equipment	$ 37,120	$ 36,964
Less: Accumulated depreciation	23,705	21,568
Fixed assets less accumulated depreciation	13,415	15,396	$ 15,096
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment	425	445
Building and Building Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment	3,960	3,733
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment	31,885	31,937
Seismic Vessels
Property Plant And Equipment [Line Items]
Property, plant and equipment	$ 850	$ 849