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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2019
Apr. 01, 2017
Income Tax Contingency [Line Items]              
Effective income tax rate 24.60%   19.60% 46.00% 16.20%    
Foreign earnings not indefinitely reinvested $ 518     $ 518      
Potential federal and state cost from tax examinations       438      
Increase in liability for uncertain tax positions   $ 29          
Reasonably possible reduction in liability for uncertain tax positions $ 43     $ 43      
HPES              
Income Tax Contingency [Line Items]              
Tax indemnification receivable, uncertain tax positions             $ 34
Tax indemnification receivable, tax indemnification payable             68
Tax indemnification payable             $ 120
Perspecta              
Income Tax Contingency [Line Items]              
Tax indemnification payable           $ 29  
Tax indemnification receivable           $ 73