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Credit Quality (Summary of the Bancorp's Nonperforming Loans and Leases by Class) (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Modifications    
Loans and leases held for sale $ 663 [1] $ 492
Portfolio loans and leases 93,271 91,833
Commercial Portfolio Segment    
Financing Receivable, Modifications    
Portfolio loans and leases 57,915 56,395
Nonaccrual    
Financing Receivable, Modifications    
Loans and leases held for sale 35 6
Portfolio loans and leases 125 131
Nonaccrual | Government Insured    
Financing Receivable, Modifications    
Portfolio loans and leases 4 3
Restructured nonaccrual loans and leases $ 2 $ 3
[1]

Includes $ 563 and $ 399 of residential mortgage loans held for sale measured at fair value and $ 6 and $ 0 of commercial loans held for sale measured at fair value at September 30, 2018 and December 31, 2017 , respectively.