Variable Interest Entities - Assets and Liabilities of Consolidated VIEs (Details) $ in Millions	Dec. 31, 2019 USD ($) investment	Dec. 31, 2018 USD ($)
Consolidated Assets
Interest Bearing Deposits in Banks	$ 7,184	$ 6,289
Loans Held for Investment, Net	87,675	86,033
Other assets	10,200	9,620
Consolidated Liabilities
Other liabilities	2,837	2,048
Consolidated VIEs
Consolidated Assets
Interest Bearing Deposits in Banks	0	0
Loans Held for Investment, Net	349	570
Other assets	213	165
Total Assets	562	735
Consolidated Liabilities
Other liabilities	45	17
Total Liabilities	45	17
Consolidated VIEs | LIHC investments
Consolidated Assets
Interest Bearing Deposits in Banks	0	0
Loans and Leases Receivable, Net of Deferred Income	0	0
Other assets	96	43
Total Assets	96	43
Consolidated Liabilities
Other liabilities	36	0
Total Liabilities	$ 36	0
Number of LIHC investment fund | investment	2
Consolidated VIEs | Leasing investments
Consolidated Assets
Interest Bearing Deposits in Banks	$ 0	0
Loans and Leases Receivable, Net of Deferred Income	349	570
Other assets	117	122
Total Assets	466	692
Consolidated Liabilities
Other liabilities	9	17
Total Liabilities	$ 9	$ 17