Loans - Wholesale Loan Portfolio - Real Estate Class of Loans (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	$ 724,177	$ 726,835	$ 718,997
Wholesale-related [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	308,263	306,222	278,395
Wholesale-related [Member] | Wholesale Real Estate Multifamily [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	44,389	38,030
% of total criticized to total retained loans	2.57%	5.57%
% of nonaccrual loans to total retained loans	0.43%	0.65%
Wholesale-related [Member] | Wholesale Real Estate Commercial Lessors [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	15,949	14,668
% of total criticized to total retained loans	8.30%	13.30%
% of nonaccrual loans to total retained loans	0.90%	1.41%
Wholesale-related [Member] | Wholesale Real Estate Commercial Construction and Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	3,674	2,989
% of total criticized to total retained loans	2.20%	3.98%
% of nonaccrual loans to total retained loans	0.08%	0.70%
Wholesale-related [Member] | Wholesale Real Estate Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	5,139	5,053
% of total criticized to total retained loans	0.56%	3.74%
% of nonaccrual loans to total retained loans	0.18%	0.85%
Wholesale-related [Member] | Real estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	69,151	60,740
% of total criticized to total retained loans	3.72%	7.21%
% of nonaccrual loans to total retained loans	0.50%	0.86%
Wholesale-related [Member] | Criticized [Member] | Wholesale Real Estate Multifamily [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,142	2,118
Wholesale-related [Member] | Criticized [Member] | Wholesale Real Estate Commercial Lessors [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	1,323	1,951
Wholesale-related [Member] | Criticized [Member] | Wholesale Real Estate Commercial Construction and Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	81	119
Wholesale-related [Member] | Criticized [Member] | Wholesale Real Estate Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	29	189
Wholesale-related [Member] | Criticized [Member] | Real estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	2,575	4,377
Wholesale-related [Member] | Criticized Nonaccrual [Member] | Wholesale Real Estate Multifamily [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	191	249
Wholesale-related [Member] | Criticized Nonaccrual [Member] | Wholesale Real Estate Commercial Lessors [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	143	207
Wholesale-related [Member] | Criticized Nonaccrual [Member] | Wholesale Real Estate Commercial Construction and Development [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	3	21
Wholesale-related [Member] | Criticized Nonaccrual [Member] | Wholesale Real Estate Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	9	43
Wholesale-related [Member] | Criticized Nonaccrual [Member] | Real estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total retained loans	$ 346	$ 520