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Sale of Receivables (Tables)
 6 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
Summary of Transfer of Assets Accounted for as Sales, Deferred Purchase Price
The following table is a reconciliation of the beginning and ending balances of the DPP:
 
 
As of and for the
(in millions)
 
Three Months Ended September 30, 2017
 
Six Months Ended
September 30, 2017
Beginning balance
 
$
242

 
$
252

    Transfers of receivables
 
606

 
1,154

Collections
 
(579
)
 
(1,124
)
Fair value adjustment
 
3

 
(10
)
Ending balance
 
$
272

 
$
272