Other Liabilities - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Other Liabilities Disclosure [Line Items] | ||||
| Operating lease costs | $ 118 | $ 116 | $ 348 | $ 339 |
| Lessee, operating lease, lease not yet commenced amount | 344 | 344 | ||
| Asset Management [Member] | ||||
| Other Liabilities Disclosure [Line Items] | ||||
| Liabilities classified as held for sale related to consolidated investments | $ 2,060 | $ 2,060 | ||