Variable Interest Entities - Consolidated VIEs (Details) $ in Millions	Dec. 31, 2020 USD ($) investment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Consolidated Assets
Interest Bearing Deposits in Banks	$ 14,309	$ 7,184
Loans Held for Investment, Net	80,893	87,675
Other assets	9,916	10,200
Total assets	167,846	170,810	$ 168,100
Consolidated Liabilities
Other liabilities	2,906	2,837
Total liabilities	150,567	154,443
Consolidated VIEs
Consolidated Assets
Loans Held for Investment, Net	310	349
Other assets	192	213
Total assets	502	562
Consolidated Liabilities
Other liabilities	21	45
Total liabilities	21	45
Consolidated VIEs | LIHC investments
Consolidated Assets
Other assets	81	96
Total assets	81	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	$ 310	349
Other assets	111	117
Total assets	421	466
Consolidated Liabilities
Other liabilities	5	9
Total liabilities	$ 5	$ 9