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Receivables, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Receivables, Net, Current [Abstract]    
Customer accounts $ 17,201 $ 14,941
Other 3,014 3,584
Total 20,215 18,525
Allowances (265) (279)
Net $ 19,950 $ 18,246