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Finance Receivables and Allowance for Credit Losses Allowance for credit losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss $ 1,231 $ 513   $ 513 $ 589
Finance receivables, net 110,746     114,317  
Financing Receivable, Allowance for Credit Loss, Writeoff (146) (154)      
Financing Receivable, Allowance for Credit Loss, Recovery 45 45      
Provision for Loan, Lease, and Other Losses 586 33      
Financing Receivable, Allowance for Credit Losses, Other (19) 0      
Financing Receivable, before Allowance for Credit Loss 111,977     114,830  
Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss 1,157 496   496 566
Financing Receivable, Allowance for Credit Loss, Writeoff (145) (137)      
Financing Receivable, Allowance for Credit Loss, Recovery 43 43      
Provision for Loan, Lease, and Other Losses 534 24      
Financing Receivable, Allowance for Credit Losses, Other (18) 0      
Financing Receivable, before Allowance for Credit Loss 70,906        
Commercial Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss 74 17   17 $ 23
Financing Receivable, Allowance for Credit Loss, Writeoff (1) (17)      
Financing Receivable, Allowance for Credit Loss, Recovery 2 2      
Provision for Loan, Lease, and Other Losses 52 9      
Financing Receivable, Allowance for Credit Losses, Other (1) $ 0      
Financing Receivable, before Allowance for Credit Loss 41,071     40,855  
Accounting Standards Update 2016-13 [Member]          
Financing Receivable, Allowance for Credit Loss     $ 252    
Finance receivables, net     252    
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member]          
Finance receivables, net     247    
Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member]          
Finance receivables, net     5    
Retail Installment loans, dealer financing, and other financing [Domain] [Member]          
Finance receivables, net 103,048   105,901 $ 106,131  
Retail Installment loans, dealer financing, and other financing [Domain] [Member] | Accounting Standards Update 2016-13 [Member]          
Finance receivables, net     $ (230)    
Adverse impact [Member]          
Financing Receivable, Allowance for Credit Loss 718        
Global pandemic [Member]          
Financing Receivable, Allowance for Credit Loss $ 486