Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Consolidated Assets
Interest Bearing Deposits in Banks	$ 2,883	$ 4,329
Loans Held for Investment, net	69,376	67,744
Other assets	5,253	4,854
Consolidated Liabilities
Other Liabilities	1,611	1,675
Consolidated VIEs
Consolidated Assets
Interest Bearing Deposits in Banks	13
Loans Held for Investment, net	739
Other assets	353
Total assets	1,105
Consolidated Liabilities
Long-Term Debt	4
Other Liabilities	77
Total Liabilities	81
Consolidated VIEs | Low-income housing credit investments
Consolidated Assets
Interest Bearing Deposits in Banks	9
Other assets	260
Total assets	269
Consolidated Liabilities
Long-Term Debt	4
Total Liabilities	4
Number of LIHC investment fund	2
Consolidated VIEs | Leasing investments
Consolidated Assets
Interest Bearing Deposits in Banks	4
Loans Held for Investment, net	739
Other assets	93
Total assets	836
Consolidated Liabilities
Other Liabilities	77
Total Liabilities	$ 77