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Receivables, Net (Tables)
12 Months Ended
Mar. 31, 2019
Receivables, Net, Current [Abstract]  
Schedule of receivables
 
March 31,
(In millions)
2019
 
2018
Customer accounts
$
14,941

 
$
14,349

Other
3,584

 
3,578

Total
18,525

 
17,927

Allowances
(279
)
 
(216
)
Net
$
18,246

 
$
17,711