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Financial Instruments (Narative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value Disclosures [Abstract]    
Short-term investments $ 2,354 $ 5,444
Time Deposits 1,600 3,000
Commercial Paper 765 2,400
Marketable Securities, Equity Securities 57 $ 46
Repayments of Accounts Receivable Securitization $ 385