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Loans and Leases - Loan Modifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	$ 3	$ 188	$ 32	$ 253
Loans and Leases Held for Investment: | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		$ 100	$ 2	$ 100
Percent of Total Loan class		0.95%	0.01%	0.95%
Loans and Leases Held for Investment: | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		$ 67	$ 12	$ 119
Percent of Total Loan class		0.64%	0.13%	1.13%
Loans and Leases Held for Investment: | One-to-four family first mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	$ 2	$ 6	$ 9	$ 12
Percent of Total Loan class	0.04%	0.10%	0.15%	0.20%
Other loans held for investment | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	$ 1	$ 14	$ 9	$ 21
Percent of Total Loan class	0.01%	0.07%	0.05%	0.10%
Other loans held for investment | Other Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		$ 1		$ 1
Percent of Total Loan class		0.04%		0.04%
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	$ 0	$ 171	$ 10	$ 223
Interest Rate Reduction | Loans and Leases Held for Investment: | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		$ 100	$ 2	$ 100
Interest Rate Reduction | Loans and Leases Held for Investment: | Multi-family | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate		7.73%	8.08%	7.73%
Interest Rate Reduction | Loans and Leases Held for Investment: | Multi-family | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate		6.17%	6.00%	6.17%
Interest Rate Reduction | Loans and Leases Held for Investment: | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		$ 67	$ 8	$ 119
Interest Rate Reduction | Loans and Leases Held for Investment: | Commercial real estate | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate		10.77%	8.13%	10.48%
Interest Rate Reduction | Loans and Leases Held for Investment: | Commercial real estate | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate		4.32%	7.00%	4.18%
Interest Rate Reduction | Loans and Leases Held for Investment: | One-to-four family first mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	$ 0	$ 3	$ 0	$ 3
Weighted-average Term (in years)	10 years 8 months 23 days	9 years 10 months 24 days	12 years 1 month 6 days	12 years
Interest Rate Reduction | Loans and Leases Held for Investment: | One-to-four family first mortgage | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate	0.00%	0.00%	4.69%	0.00%
Interest Rate Reduction | Loans and Leases Held for Investment: | One-to-four family first mortgage | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate	0.00%	0.00%	3.70%	0.00%
Interest Rate Reduction | Loans and Leases Held for Investment: | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average Term (in years)	1 year 10 months 24 days	4 months 9 days	7 months 6 days	5 months 15 days
Interest Rate Reduction | Loans and Leases Held for Investment: | Commercial and industrial | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate	0.00%	8.02%	7.81%	8.02%
Interest Rate Reduction | Loans and Leases Held for Investment: | Commercial and industrial | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate	0.00%	7.74%	6.10%	7.74%
Interest Rate Reduction | Loans and Leases Held for Investment: | Other Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average Term (in years)		4 years 9 months 18 days	1 year 9 months 18 days	4 years 9 months 18 days
Interest Rate Reduction | Loans and Leases Held for Investment: | Other Consumer | Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate		9.28%	10.73%	14.49%
Interest Rate Reduction | Loans and Leases Held for Investment: | Other Consumer | Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Weighted-average contractual interest rate		4.75%	4.30%	8.00%
Interest Rate Reduction | Other loans held for investment | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	$ 0	$ 1	$ 0	$ 1
Interest Rate Reduction | Other loans held for investment | Other Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		0		0
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	2	12	18	22
Term Extension | Loans and Leases Held for Investment: | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		0	0	0
Term Extension | Loans and Leases Held for Investment: | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		0	4	0
Term Extension | Loans and Leases Held for Investment: | One-to-four family first mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	1	1	6	4
Term Extension | Other loans held for investment | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	1	11	8	18
Term Extension | Other loans held for investment | Other Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		0		0
Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	0	5	3	8
Combination - Interest Rate Reduction & Term Extension | Loans and Leases Held for Investment: | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		0	0	0
Combination - Interest Rate Reduction & Term Extension | Loans and Leases Held for Investment: | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		0	0	0
Combination - Interest Rate Reduction & Term Extension | Loans and Leases Held for Investment: | One-to-four family first mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	0	2	2	5
Combination - Interest Rate Reduction & Term Extension | Other loans held for investment | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	0	2	1	2
Combination - Interest Rate Reduction & Term Extension | Other loans held for investment | Other Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		1		1
Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	1	0	1	0
Principal Forgiveness | Loans and Leases Held for Investment: | Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		0	0	0
Principal Forgiveness | Loans and Leases Held for Investment: | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		0	0	0
Principal Forgiveness | Loans and Leases Held for Investment: | One-to-four family first mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	1	0	1	0
Principal Forgiveness | Other loans held for investment | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost	$ 0	0	$ 0	0
Principal Forgiveness | Other loans held for investment | Other Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost		$ 0		$ 0

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- Definition

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