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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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