Loans - Wholesale Loan Portfolio, Loans Secured by Real Estate (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 1,408,905	$ 1,299,590	$ 1,280,870
Wholesale
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 792,367	$ 690,396	$ 672,472
% of criticized to total retained loans secured by real estate	3.63%	3.67%
% of criticized nonaccrual loans to total retained loans secured by real estate	0.56%	0.57%
Wholesale | Criticized nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 4,398	$ 3,942
Wholesale | Secured by real estate
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 165,545	$ 162,432
% of criticized to total retained loans secured by real estate	6.37%	6.61%
% of criticized nonaccrual loans to total retained loans secured by real estate	1.01%	0.89%
Wholesale | Secured by real estate | Commercial construction and development
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 12,400	$ 12,200
Wholesale | Secured by real estate | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	105,130	101,114
Wholesale | Secured by real estate | Other Commercial
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	60,415	61,318
Wholesale | Secured by real estate | Criticized
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 10,550	$ 10,730
% of criticized to total retained loans secured by real estate	6.37%	6.61%
Wholesale | Secured by real estate | Criticized | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 4,661	$ 4,700
% of criticized to total retained loans secured by real estate	4.43%	4.65%
Wholesale | Secured by real estate | Criticized | Other Commercial
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 5,889	$ 6,030
% of criticized to total retained loans secured by real estate	9.75%	9.83%
Wholesale | Secured by real estate | Criticized nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 1,678	$ 1,439
% of criticized nonaccrual loans to total retained loans secured by real estate	1.01%	0.89%
Wholesale | Secured by real estate | Criticized nonaccrual | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 422	$ 337
% of criticized nonaccrual loans to total retained loans secured by real estate	0.40%	0.33%
Wholesale | Secured by real estate | Criticized nonaccrual | Other Commercial
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 1,256	$ 1,102
% of criticized nonaccrual loans to total retained loans secured by real estate	2.08%	1.80%