Revenue - Schedule of Changes in Technology Services Deferred Revenue Liability (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Revenue From Contract With Customer [Abstract] | ||
| Beginning balance | $ 70 | $ 62 |
| Additions | 86 | 44 |
| Revenue recognized that was included in the beginning balance | (40) | (36) |
| Ending balance | $ 116 | $ 70 |