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Segment Reporting - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) Segment Client	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | Segment	4
Total assets	$ 83,348	$ 87,412
Business Processing [Member]
Segment Reporting Information [Line Items]
Total assets	$ 416	425
Business Processing [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Number of clients for business processing services | Client	500
Other Segment [Member]
Segment Reporting Information [Line Items]
Total assets	$ 2,100	$ 1,900

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