Mortgage Banking Activity - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Financing receivable, allowance for credit loss, excluding accrued interest | $ 730 | $ 822 | $ 738 | $ 815 |
| Net loans and leases | 63,647 | 63,418 | ||
| Mortgage banking income | 9 | 8 | ||
| Mortgage loans | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Financing receivable, allowance for credit loss, excluding accrued interest | 12 | $ 12 | ||
| Mortgage banking income | 1 | $ 1 | ||
| First Horizon Bank | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Net loans and leases | $ 26 | |||