Income Taxes - Deferred Income Taxes Included in Other Assets in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for loan and lease losses	$ 515	$ 252
Deferred compensation	107	103
Reserves	40	32
Reserve for unfunded commitments	36	30
State net operating loss carryforwards	3	9
State deferred taxes	1	0
Other	160	154
Total deferred tax assets	862	580
Deferred tax liabilities:
Other comprehensive income	779	352
Lease financing	638	650
MSRs and related economic hedges	120	144
Bank premises and equipment	91	73
Investments in joint ventures and partnership interests	58	25
State deferred taxes	0	47
Other	128	127
Total deferred tax liabilities	1,814	1,418
Total net deferred tax liability	$ (952)	$ (838)