Variable Interest Entities - Consolidated VIEs (Details) $ in Millions	Sep. 30, 2020 USD ($) investment	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)
Variable Interest Entities
Interest bearing deposits in banks	$ 13,138	$ 7,184
Consolidated Assets
Other Assets	9,481	10,200
Total assets	164,029	170,810	$ 173,233
Consolidated Liabilities
Other Liabilities	2,892	2,837
Total liabilities	147,088	154,443
Consolidated VIEs
Consolidated Assets
Loans Held for Investment, Net	312	349
Other Assets	197	213
Total assets	509	562
Consolidated Liabilities
Other Liabilities	21	45
Total liabilities	21	45
Consolidated VIEs | LIHC investments
Consolidated Assets
Loans Held for Investment, Net	0	0
Other Assets	85	96
Total assets	85	96
Consolidated Liabilities
Other Liabilities	16	36
Total liabilities	$ 16	36
Number of LIHC investment fund | investment	2
Consolidated VIEs | Leasing investments
Consolidated Assets
Loans Held for Investment, Net	$ 312	349
Other Assets	112	117
Total assets	424	466
Consolidated Liabilities
Other Liabilities	5	9
Total liabilities	$ 5	$ 9