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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest income - held-to-maturity securities - taxable $ 52 $ 49 $ 159 $ 138
Noninterest income - net gains (losses) on sale of securities (2) 0 (2) 4
Interest income - loans and leases 848 724 2,414 2,100
Noninterest income - other income 44 42 131 138
Noninterest expense - personnel costs (388) (377) (1,160) (1,151)
Income before income taxes 440 365 1,237 982
Provision for income taxes (62) (90) (178) (228)
Net income applicable to common shares 360 256 1,008 697
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 (3) (1) (9) (7)
Noninterest income - net gains (losses) on sale of securities 0 (8) (12) (8)
Accumulated OTTI | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Noninterest income - net gains (losses) on sale of securities 0 0 0 (4)
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 (3) (9) (21) (19)
Provision for income taxes 1 4 4 7
Net income applicable to common shares (2) (5) (17) (12)
Unrealized gains and (losses) on cash flow hedging derivatives | Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest income - loans and leases     0 (1)
Noninterest income - other income     0 0
Income before income taxes     0 (1)
Provision for income taxes     0 1
Net income applicable to common shares     0 0
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) (1) (6) (4)
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 0 (1) 2 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 (2) (2) (4) (3)
Provision for income taxes 1 1 1 1
Net income applicable to common shares $ (1) $ (1) $ (3) $ (2)