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Credit Quality (Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment) (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses            
Individually evaluated for impairment $ 168   $ 200      
Collectively evaluated for impairment 814   876      
Unallocated 109   120      
Total allowance for loan and lease losses 1,091 [1] $ 1,077 1,196 [1] $ 1,205 $ 1,226 $ 1,253
Individually evaluated for impairment 1,387   1,545      
Collectively evaluated for impairment 91,884   90,286      
Loans acquired with deteriorated credit quality 0   2      
Total portfolio loans and leases 93,271   91,833      
Commercial Portfolio Segment            
Financing Receivable, Allowance for Credit Losses            
Individually evaluated for impairment 66 [2]   94 [3]      
Collectively evaluated for impairment 590 [2]   659 [3]      
Unallocated 0 [2]   0 [3]      
Total allowance for loan and lease losses 656 [2] 654 [2] 753 [3] 777 817 831 [3]
Individually evaluated for impairment 345 [4]   560 [5]      
Collectively evaluated for impairment 57,570 [4]   55,835 [5]      
Loans acquired with deteriorated credit quality [5]     0      
Total portfolio loans and leases 57,915 [4]   56,395 [5]      
Residential Mortgage Loans            
Financing Receivable, Allowance for Credit Losses            
Individually evaluated for impairment 64 [2]   64 [3]      
Collectively evaluated for impairment 19 [2]   25 [3]      
Unallocated 0 [2]   0 [3]      
Total allowance for loan and lease losses 83 [2] 86 [2] 89 [3] 90 93 96 [3]
Individually evaluated for impairment 757 [4]   665 [5]      
Collectively evaluated for impairment 14,656 [4]   14,787 [5]      
Loans acquired with deteriorated credit quality [5]     2      
Total portfolio loans and leases 15,413 [4]   15,454 [5]      
Consumer Portfolio Segment            
Financing Receivable, Allowance for Credit Losses            
Individually evaluated for impairment 38 [2]   42 [3]      
Collectively evaluated for impairment 205 [2]   192 [3]      
Unallocated 0 [2]   0 [3]      
Total allowance for loan and lease losses 243 [2] 229 [2] 234 [3] 218 206 214 [3]
Individually evaluated for impairment 285 [4]   320 [5]      
Collectively evaluated for impairment 19,658 [4]   19,664 [5]      
Loans acquired with deteriorated credit quality [5]     0      
Total portfolio loans and leases 19,943 [4]   19,984 [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 109 [2]   120 [3]      
Total allowance for loan and lease losses 109 [2] $ 108 [2] 120 [3] $ 120 $ 110 $ 112 [3]
Individually evaluated for impairment 0 [4]   0 [5]      
Collectively evaluated for impairment 0 [4]   0 [5]      
Loans acquired with deteriorated credit quality [5]     0      
Total portfolio loans and leases $ 0 [4]   $ 0 [5]      
[1]

Includes $ 41 and $ 62 of other short-term investments , $ 793 and $ 1,297 of portfolio loans and leases, $ (4) and $ (6) of ALLL, $ 5 and $ 7 of other assets, $ 1 and $ 2 of other liabilities, and $ 710 and $ 1,190 of long-term debt from consolidated VIEs that are included in their respe ctive captions above at September 30, 2018 and December 31, 2017 , respectively. For further information refer to Note 10 .

[2]

Includes $ 1 related to leveraged leases at September 30, 2018 .

[3]

Includes $ 1 related to leveraged leases at December 31, 2017 .

[4]

Excludes $ 172 of residential mortgage loans measured at fair value and includes $ 638 of leveraged leases, net of unearned income at September 30, 2018 .

[5]

Excludes $ 137 of residential mortgage loans measured at fair value and includes $ 674 of leveraged leases, net of unearned income at December 31, 2017 .