Variable Interest Entities (Details) $ in Millions	Sep. 30, 2015 USD ($) investment	Dec. 31, 2014 USD ($)
Consolidated Assets
Interest Bearing Deposits in Banks	$ 2,692	$ 3,930
Loans Held for Investment, net	76,094	76,267
Other assets	4,961	4,630
Consolidated Liabilities
Other liabilities	2,060	1,897
Consolidated VIEs
Consolidated Assets
Interest Bearing Deposits in Banks	21	19
Loans Held for Investment, net	601	653
Other assets	354	377
Total assets	976	1,049
Consolidated Liabilities
Other liabilities	63	80
Total Liabilities	63	80
Consolidated VIEs | Low-income housing credit investments
Consolidated Assets
Interest Bearing Deposits in Banks	9	9
Loans Held for Investment, net	0	0
Other assets	196	230
Total assets	205	239
Consolidated Liabilities
Other liabilities	0	0
Total Liabilities	$ 0	0
Number of LIHC investment fund | investment	2
Consolidated VIEs | Leasing Investments
Consolidated Assets
Interest Bearing Deposits in Banks	$ 12	10
Loans Held for Investment, net	601	653
Other assets	158	147
Total assets	771	810
Consolidated Liabilities
Other liabilities	63	80
Total Liabilities	$ 63	$ 80