Loans - Wholesale Loan Portfolio, Loans Secured by Real Estate (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 1,299,590	$ 1,280,870	$ 1,089,598
Wholesale
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 690,396	$ 672,472	$ 603,670
% of criticized to total retained loans secured by real estate	3.67%	3.51%
% of criticized nonaccrual loans to total retained loans secured by real estate	0.57%	0.35%
Wholesale | Criticized nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 3,942	$ 2,346
Wholesale | Secured by real estate
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 162,432	$ 162,338
% of criticized to total retained loans secured by real estate	6.61%	4.74%
% of criticized nonaccrual loans to total retained loans secured by real estate	0.89%	0.25%
Wholesale | Secured by real estate | Commercial construction and development
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 12,200	$ 10,200
Wholesale | Secured by real estate | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	101,114	100,725
Wholesale | Secured by real estate | Other Commercial
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	61,318	61,613
Wholesale | Secured by real estate | Criticized
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 10,730	$ 7,692
% of criticized to total retained loans secured by real estate	6.61%	4.74%
Wholesale | Secured by real estate | Criticized | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 4,700	$ 3,596
% of criticized to total retained loans secured by real estate	4.65%	3.57%
Wholesale | Secured by real estate | Criticized | Other Commercial
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 6,030	$ 4,096
% of criticized to total retained loans secured by real estate	9.83%	6.65%
Wholesale | Secured by real estate | Criticized nonaccrual
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 1,439	$ 401
% of criticized nonaccrual loans to total retained loans secured by real estate	0.89%	0.25%
Wholesale | Secured by real estate | Criticized nonaccrual | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 337	$ 76
% of criticized nonaccrual loans to total retained loans secured by real estate	0.33%	0.08%
Wholesale | Secured by real estate | Criticized nonaccrual | Other Commercial
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 1,102	$ 325
% of criticized nonaccrual loans to total retained loans secured by real estate	1.80%	0.53%