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General - Discontinued Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
Jan. 04, 2021
Sep. 30, 2021
Dec. 31, 2020
Merger Agreement      
Discontinued Operations      
Cash price paid per share $ 95.00    
MCC Business | Discontinued Operations, Disposed of by Sale      
Discontinued Operations      
Disposal Group, Including Discontinued Operation, Consideration   $ 850 $ 850
Disposal Group, Including Discontinued Operation, Consideration, Closing Adjustments   $ 158 $ 158