Unsecured Borrowings - Unsecured Long-Term Borrowings after Hedging (Detail) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Fixed-rate obligations: At fair value | $ 4,863 | $ 1,521 |
| Fixed rate obligations at amortized cost | 30,370 | 30,827 |
| Floating-rate obligations: At fair value | 47,527 | 39,390 |
| Floating rate obligations at amortized cost | 171,332 | 141,743 |
| Total | 254,092 | 213,481 |
| Group Inc. [Member] | ||
| Debt Instrument [Line Items] | ||
| Fixed-rate obligations: At fair value | 4,798 | 1,407 |
| Fixed rate obligations at amortized cost | 27,133 | 27,482 |
| Floating-rate obligations: At fair value | 12,864 | 9,721 |
| Floating rate obligations at amortized cost | 164,001 | 133,312 |
| Total | 208,796 | 171,922 |
| Subsidiaries [Member] | ||
| Debt Instrument [Line Items] | ||
| Fixed-rate obligations: At fair value | 65 | 114 |
| Fixed rate obligations at amortized cost | 3,237 | 3,345 |
| Floating-rate obligations: At fair value | 34,663 | 29,669 |
| Floating rate obligations at amortized cost | 7,331 | 8,431 |
| Total | $ 45,296 | $ 41,559 |