INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Other comprehensive income	$ 409	$ 241
Allowance for credit losses	471	465
State net operating loss carryforwards	75	137
Accrued expenses not currently deductible	129	135
Investment and other tax credit carryforwards	52	0
Deferred income	22	40
Fair value adjustments	40	36
Other	0	5
Total deferred tax assets	1,198	1,059
Valuation allowance	(107)	(123)
Deferred tax assets, net of valuation allowance	1,091	936
Deferred tax liabilities:
Leasing transactions	881	882
Amortization of intangibles	522	455
Depreciation	234	213
Pension and other employee compensation plans	103	69
MSRs	49	47
Other	16	0
Total deferred tax liabilities	1,805	1,666
Net deferred tax liability	$ 714	$ 730