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Loans - Delinquency Ratio for Consumer Loan (Detail) - Consumer Loans [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]    
Delinquent Loans $ 416 $ 405
Delinquency Ratio 2.04% 2.05%
Residential Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Delinquent Loans [1],[2] $ 350 $ 347
Delinquency Ratio [1],[2] 1.96% 1.99%
Home Equity Mortgages [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Delinquent Loans [1],[2] $ 25 $ 30
Delinquency Ratio [1],[2] 2.93% 3.05%
Credit Cards [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Delinquent Loans $ 34 $ 20
Delinquency Ratio 2.42% 1.96%
Other consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Delinquent Loans $ 7 $ 8
Delinquency Ratio 2.47% 2.62%
[1] At December 31, 2019 and 2018, consumer mortgage loan delinquency includes $256 million and $254 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.
[2] At December 31, 2019 and 2018, consumer mortgage loans include $142 million and $125 million, respectively, of loans that were in the process of foreclosure.