Goodwill and Acquired Intangibles - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization expense for acquired finite lived intangible assets	$ 284	$ 296	$ 312
Amortization of finite lived intangible assets in 2020	263
Amortization of finite lived intangible assets in 2021	256
Amortization of finite lived intangible assets in 2022	253
Amortization of finite lived intangible assets in 2023	250
Amortization of finite lived intangible assets in 2024	247
Amortization of finite lived intangible assets after 2024	$ 1,100
Minimum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	20 years
Customer programs | Minimum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	9 years
Customer programs | Maximum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	20 years
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	4 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	10 years
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	3 years
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets are amortized	10 years