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Receivables - Narrative (Detail) - Finance and Financial Products [Member]
1 Months Ended 9 Months Ended
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
CAD
Jun. 30, 2017
CAD
Secured Revolving Credit Facility [Member] | Financial Institution Borrower [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Credit facility amount $ 1,600,000,000       CAD 2,000,000,000
Expiration period of credit facility 1 year        
Expiration date of credit facility Jun. 29, 2018        
Outstanding loan balance | CAD       CAD 0  
Loans and finance receivables [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provisions for loan losses   $ 124,000,000 $ 124,000,000    
Loan charge-offs, net of recoveries   $ 126,000,000 $ 123,000,000    
Percent of loan balances evaluated collectively for impairment       98.00%  
Percent of loan balances that are performing       99.00%  
Percent of loan balances that are current as to payment status       95.00%