Revenue - Schedule of Changes in Deferred Carried Interest Liability (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| Revenue From Contract With Customer [Abstract] | ||||
| Beginning balance | $ 327 | $ 224 | $ 293 | $ 219 |
| Net increase (decrease) in unrealized allocations | 48 | 22 | 99 | 27 |
| Performance fee revenue recognized | (10) | (4) | (27) | (4) |
| Ending balance | $ 365 | $ 242 | $ 365 | $ 242 |