Revenue - Schedule of Changes in Technology Services Deferred Revenue Liability (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Revenue From Contract With Customer [Abstract] | ||
| Beginning balance | $ 116 | $ 70 |
| Additions | 89 | 86 |
| Revenue recognized that was included in the beginning balance | (82) | (40) |
| Ending balance | $ 123 | $ 116 |