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Receivables - Reconciliation of DPP (Details) - DE Purchasers
$ in Millions
9 Months Ended
Dec. 31, 2020
USD ($)
Transfer of Financial Assets Accounted for as Sales, Deferred Purchase Price [Roll Forward]  
Beginning balance $ 103
Transfers of receivables 417
Collections (420)
Change in funding availability 2
Facility amendments (102)
Ending balance $ 0