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Loans - Status of Consumer Loan Portfolio (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Financing Receivable, Recorded Investment [Line Items]      
Accruing Loans Contractually Past Due 90 days or More $ 17 $ 18  
Total loans 66,399 72,563 $ 68,063
Consumer Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 19,072 19,030  
Nonaccrual Loans 468 481  
Accruing Loans Contractually Past Due 90 days or More 16 17  
Total loans 19,556 19,528  
Consumer Loans [Member] | Residential Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 16,921 16,859  
Nonaccrual Loans [1],[2],[3] 405 414  
Accruing Loans Contractually Past Due 90 days or More 0 0  
Total loans 17,326 17,273 17,119
Consumer Loans [Member] | Home Equity Mortgages [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 1,023 1,124  
Nonaccrual Loans [1],[3] 63 67  
Accruing Loans Contractually Past Due 90 days or More 0 0  
Total loans 1,086 1,191 1,285
Consumer Loans [Member] | Credit Cards [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 830 712  
Nonaccrual Loans 0 0  
Accruing Loans Contractually Past Due 90 days or More 11 9  
Total loans 841 721 647
Consumer Loans [Member] | Other consumer [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Performing Loans 298 335  
Nonaccrual Loans 0 0  
Accruing Loans Contractually Past Due 90 days or More 5 8  
Total loans $ 303 $ 343 $ 424
[1] At June 30, 2018 and December 31, 2017, nonaccrual consumer mortgage loans held for investment include $348 million and $360 million, respectively, of loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell.
[2] Nonaccrual consumer mortgage loans for all periods does not include guaranteed loans purchased from the Government National Mortgage Association. Repayment of these loans is predominantly insured by the Federal Housing Administration and as such, these loans have different risk characteristics from the rest of our consumer loan portfolio.
[3] Nonaccrual consumer mortgage loans held for investment include all loans which are 90 or more days contractually delinquent as well as loans discharged under Chapter 7 bankruptcy and not re-affirmed and second lien loans where the first lien loan that we own or service is 90 or more days contractually delinquent.