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, 2018
Mar. 31, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Interest income - held-to-maturity securities - taxable $ 54 $ 45
Noninterest income - net gains (losses) on sale of securities 0 0
Interest income - loans and leases 756 676
Noninterest income - other income 42 46
Noninterest expense - personnel costs (376) (382)
Income before income taxes 385 267
Provision for income taxes (59) (59)
Net income applicable to common shares 314 189
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) (4)
Noninterest income - net gains (losses) on sale of securities (12) (2)
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
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 (15) (6)
Provision for income taxes 3 2
Net income applicable to common shares (12) (4)
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)
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)
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 0
Provision for income taxes 0 0
Net income applicable to common shares $ 1 $ 0