Goodwill and Acquired Intangibles - Acquired Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived, Gross Carrying Amount	$ 3,581	$ 3,581
Indefinite-Lived, Carrying Amount	887	887
Finite-Lived, Accumulated Amortization	(1,255)	(974)
Total acquired intangibles	4,468	4,468
Finite-Lived, Net Carrying Amount	2,326	2,607
Total acquired intangibles, Net Carrying Amount	3,213	3,494
Customer programs
Finite-Lived Intangible Assets [Line Items]
Finite-Lived, Gross Carrying Amount	3,184	3,184
Finite-Lived, Accumulated Amortization	(967)	(735)
Finite-Lived, Net Carrying Amount	2,217	2,449
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived, Gross Carrying Amount	344	344
Finite-Lived, Accumulated Amortization	(243)	(199)
Finite-Lived, Net Carrying Amount	101	145
Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived, Gross Carrying Amount	53	53
Finite-Lived, Accumulated Amortization	(45)	(40)
Finite-Lived, Net Carrying Amount	$ 8	$ 13