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Allowance for Credit Losses - Allowance for Credit Losses and Finance Receivables by Portfolio Segment (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable Allowance For Credit Losses [Line Items]    
Provision for credit losses $ (3) $ 183
Finance Receivables, Net [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses at beginning of period 1,215 727
Charge-offs (33) (69)
Recoveries 17 10
Provision for credit losses (3) 183
Allowance for credit losses at end of period 1,196 1,143
Finance Receivables, Net [Member] | ASU 2016-13 [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Adoption of ASU 2016-13   292
Finance Receivables, Net [Member] | Retail loan [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses at beginning of period 1,075 486
Charge-offs (33) (69)
Recoveries 17 9
Provision for credit losses (7) 226
Allowance for credit losses at end of period 1,052 933
Finance Receivables, Net [Member] | Retail loan [Member] | ASU 2016-13 [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Adoption of ASU 2016-13   281
Finance Receivables, Net [Member] | Dealer products [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Allowance for credit losses at beginning of period 140 241
Charge-offs 0 0
Recoveries 0 1
Provision for credit losses 4 (43)
Allowance for credit losses at end of period $ 144 210
Finance Receivables, Net [Member] | Dealer products [Member] | ASU 2016-13 [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Adoption of ASU 2016-13   $ 11