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Stock-based Compensation - Narrative (Details) - USD ($)
1 Months Ended 5 Months Ended 12 Months Ended
May 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of incentive plan P10Y        
Incremental stock compensation expense as a result of modification of equity awards     $ 0    
Cash received from stock awards exercised during the period   $ 0 1,000,000 $ 3,000,000 $ 4,000,000
Total grant date fair value of restricted stock unit awards vested   15,000,000   3,000,000 2,000,000
Intrinsic value of options exercised   $ 1,000,000 1,000,000 $ 3,000,000 $ 2,000,000
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense     $ 26,000,000    
Recognition period for compensation expense     3 years    
Grant date fair value     $ 1,000,000    
Performance-based Restricted Stock Units (PSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense     $ 10,000,000    
Performance period     3 years    
Minimum | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     1 year    
Minimum | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     1 year    
Maximum | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     3 years    
Maximum | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     3 years    
2018 Employee Equity Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate amount of common stock granted (in shares)     7,345,900 9,500,000  
2018 Director Equity Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate amount of common stock granted (in shares)     254,400    
Maximum aggregate amount of shares to be issued (in shares)       310,000  
Principal Equity Plan | Minimum | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     3 years    
Principal Equity Plan | Maximum | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     4 years