INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Other comprehensive income	$ 227	$ 29
Allowance for credit losses	448	622
State net operating loss carryforwards	50	71
Accrued expenses not currently deductible	676	77
Investment and other tax credit carryforwards	110	99
Total deferred tax assets	1,511	898
Valuation allowance	(103)	(98)
Deferred tax assets, net of valuation allowance	1,408	800
Deferred tax liabilities:
Leasing transactions	331	459
Amortization of intangibles	379	376
Depreciation	256	262
Pension and other employee compensation plans	132	107
Partnerships	95	76
Deferred Income	85	62
MSRs	130	87
Total deferred tax liabilities	1,408	1,429
Net deferred tax liability	$ 0	$ 629