Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Dec. 31, 2024 |
|
| Derivative [Line Items] | ||
| Amortized Cost | $ 73,439 | $ 73,833 |
| Asset Pledged as Collateral | ||
| Derivative [Line Items] | ||
| Pledged securities | $ 38,172 | $ 48,058 |
| Max | ||
| Derivative [Line Items] | ||
| Risk Participation Agreement Terms | 10 years | |
| Min | ||
| Derivative [Line Items] | ||
| Risk Participation Agreement Terms | 1 year | |
| Cash flow hedges | ||
| Derivative [Line Items] | ||
| Estimated portion of net after-tax gain (loss) on active and terminated hedges to be reclassified from AOCI into earnings during the next 12 months | $ (232) |