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Investments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
May 01, 2020
Aug. 01, 2018
Investments [Line Items]            
Income (Loss) from Equity Method Investments     $ 2 $ 10    
Pre-Tax Gain on Divestiture     508      
naviHealth [Member]            
Investments [Line Items]            
Proceeds from Divestiture of Businesses $ 737          
Equity Method Investment, Ownership Percentage         40.00%  
Equity Method Investments     $ 334     $ 358
Partnership Indirect Ownership         100.00%  
Pre-Tax Gain on Divestiture   $ 508   $ 508    
Navi Ownership Interest Divested [Member] | naviHealth [Member]            
Investments [Line Items]            
Noncontrolling Interest, Ownership Percentage by Parent           98.00%