Allowance for Credit Losses on Loans and Leases - Schedule of Non-Accrual Loans (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Non-accrual loans with no related allowance:	$ 1,537	$ 1,636
Non-accrual loans with an allowance recorded:	1,438	979
Total non-accrual loans	2,975	2,615
Related Allowance	222	164
Loans held for investment \| Multi-family
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Non-accrual loans with no related allowance:	1,141	1,092
Non-accrual loans with an allowance recorded:	1,120	663
Total non-accrual loans	2,261	1,755
Related Allowance	99	77
Loans held for investment \| Commercial real estate
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Non-accrual loans with no related allowance:	319	429
Non-accrual loans with an allowance recorded:	170	135
Total non-accrual loans	489	564
Related Allowance	60	31
Loans held for investment \| One-to-four family first mortgage
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Non-accrual loans with no related allowance:	40	61
Non-accrual loans with an allowance recorded:	24	9
Total non-accrual loans	64	70
Related Allowance	2	1
Commercial and industrial
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Non-accrual loans with no related allowance:	0	3
Non-accrual loans with an allowance recorded:	31	21
Total non-accrual loans	31	24
Related Allowance	29	55
Commercial and industrial \| Commercial and industrial
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Non-accrual loans with no related allowance:	37	51
Non-accrual loans with an allowance recorded:	93	151
Total non-accrual loans	130	202
Related Allowance	$ 32	$ 0