Variable Interest Entities - Assets and Liabilities of Consolidated VIEs (Details) $ in Millions	Dec. 31, 2016 USD ($) investment	Dec. 31, 2015 USD ($)
Consolidated Assets
Interest Bearing Deposits in Banks	$ 3,844	$ 2,749
Loans Held for Investment, net	76,912	78,534
Other assets	8,496	6,537
Total Assets	0
Consolidated Liabilities
Other liabilities	2,520	2,251
Consolidated VIEs
Consolidated Assets
Interest Bearing Deposits in Banks	0	30
Loans Held for Investment, net	641	694
Other assets	286	375
Total Assets	927	1,099
Consolidated Liabilities
Other liabilities	54	59
Total Liabilities	54	59
Consolidated VIEs | LIHC investments
Consolidated Assets
Interest Bearing Deposits in Banks	0	9
Loans Held for Investment, net	0	0
Other assets	112	178
Total Assets	112	187
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	$ 0	21
Loans Held for Investment, net	641	694
Other assets	174	197
Total Assets	815	912
Consolidated Liabilities
Other liabilities	54	59
Total Liabilities	$ 54	$ 59