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Receivables - Narrative (Detail) - Finance and Financial Products [Member]
1 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
CAD
Jun. 30, 2017
CAD
Loans and finance receivables [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provisions for loan losses   $ 160,000,000 $ 144,000,000    
Loan charge-offs, net of recoveries   $ 162,000,000 $ 144,000,000    
Percent of loan balances evaluated collectively for impairment       98.00%  
Percent of loan balances considered to be performing       99.00%  
Percent of loan balances considered to be current as to payment status       95.00%  
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