Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 1,270	$ 1,379
Less accumulated depreciation and amortization	(780)	(846)
Property, plant and equipment, Net	490	533
Land and buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 337	352
Land and buildings | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life	25 years
Land and buildings | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life	50 years
Information and communication equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 825	908
Information and communication equipment | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life	3 years
Information and communication equipment | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life	10 years
Furniture, equipment and other
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 108	$ 119
Furniture, equipment and other | Minimum
Property Plant And Equipment [Line Items]
Estimated Useful Life	3 years
Furniture, equipment and other | Maximum
Property Plant And Equipment [Line Items]
Estimated Useful Life	10 years