Variable Interest Entities (Details 2) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Unconsolidated Assets
Securities available for sale		$ 14,355	$ 13,724
Loans Held for Investment	[1]	76,641	76,804
Other Assets		4,961	4,630
Unconsolidated Liabilities
Other liabilities		2,060	1,897
Unconsolidated VIEs
Unconsolidated Assets
Securities available for sale		25	25
Loans Held for Investment		234	213
Other Assets		2,040	2,007
Total Assets		2,299	2,245
Unconsolidated Liabilities
Other liabilities		432	488
Total Liabilities		432	488
Maximum Exposure to Loss		2,321	2,263
Unconsolidated VIEs | LIHC investments
Unconsolidated Assets
Securities available for sale		25	25	[2]
Loans Held for Investment		184	163	[2]
Other Assets		1,074	1,101	[2]
Total Assets		1,283	1,289	[2]
Unconsolidated Liabilities
Other liabilities		371	433	[2]
Total Liabilities		371	433	[2]
Maximum Exposure to Loss		1,283	1,289	[2]
Unconsolidated VIEs | Leasing Investments
Unconsolidated Assets
Securities available for sale		0	0
Loans Held for Investment		20	21
Other Assets		948	886
Total Assets		968	907
Unconsolidated Liabilities
Other liabilities		61	55
Total Liabilities		61	55
Maximum Exposure to Loss		988	923
Unconsolidated VIEs | Other investments
Unconsolidated Assets
Securities available for sale		0	0
Loans Held for Investment		30	29
Other Assets		18	20
Total Assets		48	49
Unconsolidated Liabilities
Other liabilities		0	0
Total Liabilities		0	0
Maximum Exposure to Loss		$ 50	$ 51

[1] Includes $152 million and $151 million at September 30, 2015 and December 31, 2014, respectively, for net unamortized discounts and premiums and deferred fees and costs.

[2] Prior period amounts have been revised to reflect the January 1, 2015 adoption of Accounting Standards Update 2014-01 related to investments in qualified affordable housing projects.