Fair Value Option - Summary of DVA Losses on Financial Liabilities (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
|
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| DVA (net of tax) | $ 117 | $ (2,218) | $ 98 | $ 696 |
| Other Financial Liabilities [Member] | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| DVA (pre-tax) | 159 | (2,938) | 130 | 933 |
| DVA (net of tax) | $ 117 | $ (2,218) | $ 98 | $ 696 |