Revenue - Schedule of Changes in Deferred Carried Interest Liability (Detail) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Revenue From Contract With Customer [Abstract] | ||
| Beginning balance | $ 219 | $ 152 |
| Net increase (decrease) in unrealized allocations | 5 | 9 |
| Performance fee revenue recognized that was included in the deferred carried interest liability balance at the beginning of the period | (10) | |
| Ending balance | $ 224 | $ 151 |