Quarterly report pursuant to Section 13 or 15(d)

OTHER COMPREHENSIVE INCOME - Reclassifications (Details)

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OTHER COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Interest income - held-to-maturity securities - taxable $ 54 $ 54
Interest income - loans and leases 901 756
Noninterest income - other income 39 40
Noninterest expense - personnel costs (394) (376)
Income before income taxes 421 385
Provision for income taxes (63) (59)
Net income applicable to common shares 339 314
Unrealized gains and (losses) on debt securities | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Interest income - held-to-maturity securities - taxable (4) (3)
Noninterest income - net gains (losses) on sale of securities 0 (12)
Unrealized gains and (losses) on debt securities and Accumulated OTTI | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes (4) (15)
Provision for income taxes 1 3
Net income applicable to common shares (3) (12)
Amortization of defined benefit pension and post-retirement items: actuarial gains (losses) | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Noninterest expense - personnel costs (2) 2
Amortization of defined benefit pension and post-retirement items: Prior service credit | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Noninterest expense - personnel costs 1 (1)
Unrealized gains (losses) for pension and other post- retirement obligations | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes (1) 1
Provision for income taxes 0 0
Net income applicable to common shares $ (1) $ 1