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Credit Quality (Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment) (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses        
Individually evaluated for impairment $ 160 $ 141    
Collectively evaluated for impairment 843 852    
Unallocated 112 110    
Total allowance for loan and lease losses 1,115 [1] 1,103 [1] $ 1,138 $ 1,196
Individually evaluated for impairment 1,352 1,291    
Collectively evaluated for impairment 107,477 93,795    
Purchased credit impaired 823      
Total portfolio loans and leases 109,652 95,086    
Commercial Portfolio Segment        
Financing Receivable, Allowance for Credit Losses        
Individually evaluated for impairment 62 [2] 42 [3]    
Collectively evaluated for impairment 592 [2] 603 [3]    
Unallocated 0 [2] 0 [3]    
Total allowance for loan and lease losses 654 [2] 645 [3] 713 753 [3]
Individually evaluated for impairment 346 [4] 277 [5]    
Collectively evaluated for impairment 70,659 [4] 59,294 [5]    
Purchased credit impaired 683      
Total portfolio loans and leases 71,688 [4] 59,571 [5]    
Residential Mortgage Loans        
Financing Receivable, Allowance for Credit Losses        
Individually evaluated for impairment 60 [2] 61 [3]    
Collectively evaluated for impairment 19 [2] 20 [3]    
Unallocated 0 [2] 0 [3]    
Total allowance for loan and lease losses 79 [2] 81 [3] 89 89 [3]
Individually evaluated for impairment 734 [4] 736 [5]    
Collectively evaluated for impairment 15,768 [4] 14,589 [5]    
Purchased credit impaired 119      
Total portfolio loans and leases 16,621 [4] 15,325 [5]    
Consumer Portfolio Segment        
Financing Receivable, Allowance for Credit Losses        
Individually evaluated for impairment 38 [2] 38 [3]    
Collectively evaluated for impairment 232 [2] 229 [3]    
Unallocated 0 [2] 0 [3]    
Total allowance for loan and lease losses 270 [2] 267 [3] 222 234 [3]
Individually evaluated for impairment 272 [4] 278 [5]    
Collectively evaluated for impairment 21,050 [4] 19,912 [5]    
Purchased credit impaired 21      
Total portfolio loans and leases 21,343 [4] 20,190 [5]    
Unallocated        
Financing Receivable, Allowance for Credit Losses        
Individually evaluated for impairment 0 [2] 0 [3]    
Collectively evaluated for impairment 0 [2] 0 [3]    
Unallocated 112 [2] 110 [3]    
Total allowance for loan and lease losses 112 [2] 110 [3] $ 114 $ 120 [3]
Individually evaluated for impairment 0 [4] 0 [5]    
Collectively evaluated for impairment 0 [4] 0 [5]    
Purchased credit impaired 0      
Total portfolio loans and leases $ 0 [4] $ 0 [5]    
[1]

Includes $ 39 and $ 40 of other short-term investments , $ 573 and $ 668 of portfolio loans and leases, $ (3) and $ (4) of ALLL, $ 3 and $ 5 of other assets, $ 1 and $ 1 of other liabilities, and $ 510 and $ 606 of long-term debt from consolidated VIEs that are included in their respe ctive captions above at March 31, 2019 and December 31, 2018 , respectively. For further information refer to Note 13 .

[2]

Includes $ 1 related to leveraged leases at March 31, 2019 .

[3]

Includes $ 1 related to leveraged leases at December 31, 2018 .

[4]

Excludes $ 190 of residential mortgage loans measured at fair value and includes $ 57 1 of leveraged leases, net of unearned income at March 31, 2019 .

[5]

Excludes $ 179 of residential mortgage loans measured at fair value and includes $ 62 4 of leveraged leases, net of unearned income at December 31, 2018 .