Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Effective Income Tax Rate Reconciliation (Details)

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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]                      
Provision for income taxes computed at the statutory rate                 $ 348 $ 342 $ 488
Increases (decreases):                      
Tax-exempt income                 (21) (23) (31)
Tax-exempt bank owned life insurance income                 (14) (14) (23)
General business credits                 (88) (80) (71)
Impact from TCJA                 (62) (60) (67)
Effective Income Tax Rate Reconciliation, Impact om TCJA, Amount                 0 (3) (123)
Affordable housing investment amortization, net of tax benefits                 70 64 46
State deferred tax asset valuation allowance adjustment, net                 11 10 11
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount                 (5) (14) (13)
Other                 9 13 (9)
Provision for income taxes $ 55 $ 67 $ 63 $ 63 $ 57 $ 62 $ 57 $ 59 $ 248 $ 235 $ 208