Variable Interest Entities (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Unconsolidated Assets
Trading Account Assets	$ 941	$ 851
Securities Available for Sale	14,670	15,817
Loans Held for Investment	72,369	68,312
Other Assets	5,034	4,854
Unconsolidated Liabilities
Other Liabilities	1,666	1,675
Unconsolidated VIEs
Unconsolidated Assets
Securities Available for Sale	26
Loans Held for Investment	197
Other Assets	1,918
Total Assets	2,141
Unconsolidated Liabilities
Other Liabilities	398
Total Liabilities	398
Maximum Exposure to Loss	2,159
Unconsolidated VIEs | LIHC investments
Unconsolidated Assets
Securities Available for Sale	26
Loans Held for Investment	132
Other Assets	1,053
Total Assets	1,211
Unconsolidated Liabilities
Other Liabilities	398
Total Liabilities	398
Maximum Exposure to Loss	1,211
Unconsolidated VIEs | Other investments
Unconsolidated Assets
Loans Held for Investment	21
Other Assets	27
Total Assets	48
Unconsolidated Liabilities
Maximum Exposure to Loss	50
Unconsolidated VIEs | Leasing investments
Unconsolidated Assets
Loans Held for Investment	44
Other Assets	838
Total Assets	882
Unconsolidated Liabilities
Maximum Exposure to Loss	$ 898