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Leases - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Dec. 13, 2019
Operating Leased Assets [Line Items]        
Rental expense   $ 56 $ 44  
Capital Leases, Income Statement, Interest Expense   20 $ 12  
Operating leases not yet commenced $ 27      
Financing leases not yet commenced 5      
Future minimum lease payments $ 191      
Minimum        
Operating Leased Assets [Line Items]        
Term of contracts not yet commenced 1 year      
Maximum        
Operating Leased Assets [Line Items]        
Term of contracts not yet commenced 8 years      
Herndon, Virginia        
Operating Leased Assets [Line Items]        
Assets held for sale   23    
Gain on sale of assets $ 33      
Clarksville, Virginia        
Operating Leased Assets [Line Items]        
Assets held for sale       $ 26
Future minimum lease payments   $ 15    
Sale leaseback, term   7 years