Goodwill and Acquired Intangibles - Acquired Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-Lived, Gross Carrying Amount	$ 3,635	$ 3,581
Finite-Lived, Accumulated Amortization	(1,510)	(1,255)
Finite-Lived, Net Carrying Amount	2,125	2,326
Indefinite-Lived, Carrying Amount	887	887
Total acquired intangibles	4,522	4,468
Total acquired intangibles, Net Carrying Amount	3,012	3,213
Customer programs
Finite-Lived Intangible Assets [Line Items]
Finite-Lived, Gross Carrying Amount	3,184	3,184
Finite-Lived, Accumulated Amortization	(1,199)	(967)
Finite-Lived, Net Carrying Amount	1,985	2,217
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived, Gross Carrying Amount	366	344
Finite-Lived, Accumulated Amortization	(287)	(243)
Finite-Lived, Net Carrying Amount	79	101
Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived, Gross Carrying Amount	85	53
Finite-Lived, Accumulated Amortization	(24)	(45)
Finite-Lived, Net Carrying Amount	$ 61	$ 8