Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill, impairment loss	$ 0
Goodwill deductible for income tax purposes	42,000,000
Amortization expense, intangible assets	168,000,000	$ 138,000,000
Amortization expense, computer software	121,000,000	$ 87,000,000
Purchased Software
Finite And Indefinite Lived Intangible Assets [Line Items]
Net book value	30,000,000
Internally Developed Software
Finite And Indefinite Lived Intangible Assets [Line Items]
Net book value	$ 1,321,000,000
Maximum
Finite And Indefinite Lived Intangible Assets [Line Items]
Percentage of fair value in excess of carrying amount	5.00%