Segment Reporting - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) Segment Client	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | Segment	4
Total assets	$ 78,158	$ 80,605
Business Processing [Member]
Segment Reporting Information [Line Items]
Total assets	$ 402	397
Business Processing [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Number of clients for business processing services | Client	600
Other Segment [Member]
Segment Reporting Information [Line Items]
Total assets	$ 1,300	$ 1,500