Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Goodwill deductible for income tax purposes	$ 58,000,000
Impairment of amortizable intangible assets	0
Amortization expense, intangible assets	101,000,000	$ 100,000,000
Amortization expense, computer software	$ 53,000,000	$ 54,000,000