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Allowance for Credit Losses - Allowance for Credit Losses and Finance Receivables by Portfolio Segment (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]      
Provision for credit losses $ 426 $ 590 $ 372
Finance Receivables, Net [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Allowance for credit losses at beginning of period 727 499  
Charge-offs (287) (370)  
Recoveries 57 50  
Provision for credit losses 426 548  
Allowance for credit losses at end of period 1,215 727 499
Finance Receivables, Net [Member] | ASU 2016-13 [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Adoption of ASU 2016-13 1 292    
Finance Receivables, Net [Member] | Retail loan [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Allowance for credit losses at beginning of period 486 304  
Charge-offs (287) (358)  
Recoveries 48 50  
Provision for credit losses 547 490  
Allowance for credit losses at end of period 1,075 486 304
Finance Receivables, Net [Member] | Retail loan [Member] | ASU 2016-13 [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Adoption of ASU 2016-13 1 281    
Finance Receivables, Net [Member] | Dealer products [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Allowance for credit losses at beginning of period 241 195  
Charge-offs 0 (12)  
Recoveries 9 0  
Provision for credit losses (121) 58  
Allowance for credit losses at end of period 140 $ 241 $ 195
Finance Receivables, Net [Member] | Dealer products [Member] | ASU 2016-13 [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Adoption of ASU 2016-13 1 $ 11