Fair Value Option - Summary of DVA Losses on Financial Liabilities (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| DVA (net of tax) | $ 67 | $ (268) | $ 165 | $ 428 |
| Other Financial Liabilities [Member] | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| DVA (pre-tax) | 92 | (357) | 222 | 576 |
| DVA (net of tax) | $ 67 | $ (268) | $ 165 | $ 428 |