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Cash Flows (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash paid for:    
Interest $ 33 $ 4
Taxes on income, net of refunds 19 46
Non-cash activities, Investing:    
Equipment acquired through capital lease obligations 83 10
Non-cash activities, Financing:    
Dividends declared but not yet paid 8 0
Stock issued for the acquisition of Vencore $ 578 $ 0