Variable Interest Entities - Consolidated VIEs (Details) $ in Millions	Sep. 30, 2019 USD ($) investment	Dec. 31, 2018 USD ($)
Variable Interest Entities
Interest bearing deposits in banks	$ 8,465	$ 6,289
Consolidated Assets
Other Assets	10,002	9,620
Consolidated Liabilities
Other Liabilities	2,948	2,048
Consolidated VIEs
Variable Interest Entities
Interest bearing deposits in banks	0	0
Consolidated Assets
Loans Held for Investment, Net	391	570
Other Assets	148	165
Total Assets	539	735
Consolidated Liabilities
Other Liabilities	8	17
Total Liabilities	8	17
Consolidated VIEs | LIHC investments
Variable Interest Entities
Interest bearing deposits in banks	0	0
Consolidated Assets
Loans Held for Investment, Net	0	0
Other Assets	30	43
Total Assets	30	43
Consolidated Liabilities
Other Liabilities	0	0
Total Liabilities	$ 0	0
Number of LIHC investment fund | investment	2
Consolidated VIEs | Leasing investments
Variable Interest Entities
Interest bearing deposits in banks	$ 0	0
Consolidated Assets
Loans Held for Investment, Net	391	570
Other Assets	118	122
Total Assets	509	692
Consolidated Liabilities
Other Liabilities	8	17
Total Liabilities	$ 8	$ 17