Discontinued Operations - General Information (Details) - MCC Business - Discontinued Operations, Disposed of by Sale - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Discontinued Operations
Disposal Group, Including Discontinued Operation, Consideration	$ 850	$ 850
Disposal Group, Including Discontinued Operation, Consideration, Closing Adjustments	$ 158	$ 158

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