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Allowance for Credit Losses on Loans and Leases - Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance:	$ 2,288	$ 1,636
Non-accrual loans with an allowance recorded:	892	979
Total non-accrual loans	3,180	2,615
Related Allowance	215	164
Mortgage Loans Held for Investment | Multi-family
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance:	1,781	1,092
Non-accrual loans with an allowance recorded:	607	663
Total non-accrual loans	2,388	1,755
Related Allowance	91	77
Mortgage Loans Held for Investment | Commercial real estate
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance:	377	429
Non-accrual loans with an allowance recorded:	186	135
Total non-accrual loans	563	564
Related Allowance	64	31
Mortgage Loans Held for Investment | One-to-four family first mortgage
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance:	58	61
Non-accrual loans with an allowance recorded:	23	9
Total non-accrual loans	81	70
Related Allowance	2	1
Other
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance:	0	3
Non-accrual loans with an allowance recorded:	25	21
Total non-accrual loans	25	24
Related Allowance	21	55
Other | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance:	72	51
Non-accrual loans with an allowance recorded:	51	151
Total non-accrual loans	123	202
Related Allowance	$ 37	$ 0

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