Fair Value Disclosures - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Jun. 30, 2026 |
Dec. 31, 2025 |
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] | |||||||
| Investments excluded from fair value hierarchy, net asset value practical expedient | $ 721 | $ 721 | $ 622 | ||||
| Carrying value | 4,063 | 4,063 | 5,030 | ||||
| Total loans and leases, including loans transferred to LHFS | Level 3 | Nonrecurring | |||||||
| Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] | |||||||
| Valuation adjustments | (811) | $ (692) | |||||
| Loans Transferred to Held-for-Sale | Level 3 | Nonrecurring | |||||||
| Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] | |||||||
| Valuation adjustments | 251 | ||||||
| RUFC | |||||||
| Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] | |||||||
| Carrying value | $ 370 | $ 370 | $ 317 | $ 333 | $ 317 | $ 354 | $ 304 |