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Finance Receivables Undiscounted Future Cash Payments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Financing Receivable, Impaired [Line Items]      
Financing Receivable, Gross $ 119,763 $ 119,403 $ 121,536
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Next Twelve Months 2,065    
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Two 1,955    
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Three 1,646    
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Rolling Year Four 691    
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Five 124    
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Thereafter 2    
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received 6,483    
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount (315)    
Sales-type and Direct Financing Leases, Lease Receivable 6,168    
Finance leases [Domain]      
Financing Receivable, Impaired [Line Items]      
Financing Receivable, Gross 9,012    
Automobile Loan [Member]      
Financing Receivable, Impaired [Line Items]      
Related Party Transaction Unearned Interest Supplements From Transactions With Related Party $ 340