Deposits - Types and Sources of the Firm's Deposits (Detail) - USD ($) $ in Millions |
Jun. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Deposits [Line Items] | ||
| Savings and demand | $ 214,524 | $ 186,419 |
| Time | 91,618 | 73,543 |
| Total | 306,142 | 259,962 |
| Consumer Deposits [Member] | ||
| Deposits [Line Items] | ||
| Savings and demand | 79,305 | 67,395 |
| Time | 23,201 | 29,530 |
| Total | 102,506 | 96,925 |
| Private Bank Deposits [Member] | ||
| Deposits [Line Items] | ||
| Savings and demand | 67,398 | 67,185 |
| Time | 2,546 | 1,183 |
| Total | 69,944 | 68,368 |
| Brokered Certificates Of Deposit [Member] | ||
| Deposits [Line Items] | ||
| Savings and demand | 0 | 0 |
| Time | 31,866 | 30,060 |
| Total | 31,866 | 30,060 |
| Deposit Sweep Programs [Member] | ||
| Deposits [Line Items] | ||
| Savings and demand | 28,491 | 22,987 |
| Time | 0 | 0 |
| Total | 28,491 | 22,987 |
| Transaction Banking [Member] | ||
| Deposits [Line Items] | ||
| Savings and demand | 39,330 | 28,852 |
| Time | 4,516 | 0 |
| Total | 43,846 | 28,852 |
| Other Deposits [Member] | ||
| Deposits [Line Items] | ||
| Savings and demand | 0 | 0 |
| Time | 29,489 | 12,770 |
| Total | $ 29,489 | $ 12,770 |