Allowance for Loan Losses - Changes in Allowance (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Allowance for Loan Losses [Line Items] | ||||
| Beginning balance | $ (7,532) | $ (8,379) | $ (7,707) | $ (8,730) |
| (Provision) benefit for loan losses | (912) | 285 | (927) | 467 |
| Write-offs | 283 | 179 | 533 | 427 |
| Recoveries | (86) | (111) | (146) | (190) |
| Ending balance | (8,247) | (8,026) | (8,247) | (8,026) |
| Single-family | ||||
| Allowance for Loan Losses [Line Items] | ||||
| Beginning balance | (5,178) | (6,275) | (5,319) | (6,671) |
| (Provision) benefit for loan losses | (707) | 530 | (723) | 869 |
| Write-offs | 161 | 141 | 350 | 256 |
| Recoveries | (53) | (99) | (85) | (157) |
| Ending balance | (5,777) | (5,703) | (5,777) | (5,703) |
| Multifamily | ||||
| Allowance for Loan Losses [Line Items] | ||||
| Beginning balance | (2,354) | (2,104) | (2,388) | (2,059) |
| (Provision) benefit for loan losses | (205) | (245) | (204) | (402) |
| Write-offs | 122 | 38 | 183 | 171 |
| Recoveries | (33) | (12) | (61) | (33) |
| Ending balance | $ (2,470) | $ (2,323) | $ (2,470) | $ (2,323) |