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Equity-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 18, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Total estimated compensation cost, not yet recognized, related to non-vested equity awards   $ 115
Minimum [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Weighted average future period unrecognized compensation cost related to equity based awards is expected to be recognized   1 year
Maximum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Weighted average future period unrecognized compensation cost related to equity based awards is expected to be recognized   2 years
Subsequent Event | Tranche One | Retention RSUs    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Equity awards vested, percentage 50.00%  
Subsequent Event | Tranche Two | Retention RSUs    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Equity awards converted, percentage 50.00%