Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,594	$ 1,501
Less accumulated depreciation and amortization	(1,128)	(1,033)
Property, plant and equipment, net	466	468
Land and buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 383	378
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	$ 1,108	1,014
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	$ 103	$ 109
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