Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Effective Income Tax Rate Reconciliation (Details)

v3.8.0.1
INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                      
Provision for income taxes computed at the statutory rate                 $ 488 $ 322 $ 320
Increases (decreases):                      
Tax-exempt income                 (31) (27) (21)
Tax-exempt bank owned life insurance income                 (23) (20) (18)
General business credits                 (71) (64) (48)
Impact from TCJA                 (67) (46) (46)
Effective Income Tax Rate Reconciliation, Impact om TCJA, Amount                 (123) 0 0
Affordable housing investment amortization, net of tax benefits                 46 37 32
State deferred tax asset valuation allowance adjustment, net                 11 5 5
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount                 (13) (4) 0
Other                 (9) 5 (3)
Provision (benefit) for income taxes $ (20) $ 90 $ 79 $ 59 $ 74 $ 25 $ 54 $ 55 $ 208 $ 208 $ 221