Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - ALLL Attributable to Loans by Portfolio Segment (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Portion of ALLL balance:        
Attributable to loans collectively evaluated for impairment $ 676 $ 650    
Attributable to loans individually evaluated for impairment 45 41    
Total ALLL balance 721 691 $ 673 $ 638
Portion of loan and lease ending balance:        
Collectively evaluated for impairment 69,797 68,760    
Individually evaluated for impairment 1,280 1,223    
Financing Receivable Evaluated For Impairment 71,077 70,024    
Commercial        
Portion of ALLL balance:        
Attributable to loans collectively evaluated for impairment 479 450    
Attributable to loans individually evaluated for impairment 36 32    
Total ALLL balance 515 482 480 451
Portion of loan and lease ending balance:        
Collectively evaluated for impairment 35,364 34,684    
Individually evaluated for impairment 670 607    
Financing Receivable Evaluated For Impairment 36,034 35,332    
Consumer        
Portion of ALLL balance:        
Attributable to loans collectively evaluated for impairment 197 200    
Attributable to loans individually evaluated for impairment 9 9    
Total ALLL balance 206 209 $ 193 $ 187
Portion of loan and lease ending balance:        
Collectively evaluated for impairment 34,433 34,076    
Individually evaluated for impairment 610 616    
Financing Receivable Evaluated For Impairment $ 35,043 34,692    
Purchased credit-impaired        
Portion of ALLL balance:        
Attributable to loans collectively evaluated for impairment   0    
Portion of loan and lease ending balance:        
Collectively evaluated for impairment   41    
Purchased credit-impaired | Commercial        
Portion of ALLL balance:        
Attributable to loans collectively evaluated for impairment   0    
Portion of loan and lease ending balance:        
Collectively evaluated for impairment   41    
Purchased credit-impaired | Consumer        
Portion of ALLL balance:        
Attributable to loans collectively evaluated for impairment   0    
Portion of loan and lease ending balance:        
Collectively evaluated for impairment   $ 0