Variable Interest Entities - Assets and Liabilities of Consolidated VIEs (Details) $ in Millions	Dec. 31, 2015 USD ($) investment	Dec. 31, 2014 USD ($)
Consolidated Assets
Interest Bearing Deposits in Banks	$ 2,749	$ 3,930
Loans Held for Investment, net	76,878	76,267
Other assets	5,377	4,630
Consolidated Liabilities
Other liabilities	2,023	1,897
Consolidated VIEs
Consolidated Assets
Interest Bearing Deposits in Banks	30	19
Loans Held for Investment, net	588	653
Other assets	334	377
Total assets	952	1,049
Consolidated Liabilities
Other liabilities	59	80
Total Liabilities	59	80
Consolidated VIEs | LIHC investments
Consolidated Assets
Interest Bearing Deposits in Banks	9	9
Loans Held for Investment, net	0	0
Other assets	178	230
Total assets	187	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	$ 21	10
Loans Held for Investment, net	588	653
Other assets	156	147
Total assets	765	810
Consolidated Liabilities
Other liabilities	59	80
Total Liabilities	$ 59	$ 80