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Credit Quality (Summary of Subsequent Defaults) (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Financing Receivable, Modifications        
Number of contracts [1] 201 424 496 938
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 42 $ 22 $ 51 $ 35
Commercial Portfolio Segment | Commercial and Industrial Loans        
Financing Receivable, Modifications        
Number of contracts [1] 2 2 3 4
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 28 $ 15 $ 29 $ 16
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied        
Financing Receivable, Modifications        
Number of contracts [1]     2  
Recorded Investment in Loans Modified in a TDR During the Period [1]     $ 0  
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied        
Financing Receivable, Modifications        
Number of contracts [1]   3   3
Recorded Investment in Loans Modified in a TDR During the Period [1]   $ 1   $ 1
Residential Mortgage Loans        
Financing Receivable, Modifications        
Number of contracts [1] 62 26 110 83
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 13 $ 3 $ 20 $ 12
Consumer Portfolio Segment | Home Equity        
Financing Receivable, Modifications        
Number of contracts [1]   6 2 11
Recorded Investment in Loans Modified in a TDR During the Period [1]   $ 1 $ 0 $ 2
Consumer Portfolio Segment | Credit Card        
Financing Receivable, Modifications        
Number of contracts [1] 137 387 379 837
Recorded Investment in Loans Modified in a TDR During the Period [1] $ 1 $ 2 $ 2 $ 4
[1]

(a) Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.