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Related-Party Transactions - (Narrative) (Details) - Cardinal holdings - USD ($)
$ in Millions
Apr. 29, 2021
Mar. 31, 2021
Dec. 31, 2020
Related Party Transaction      
Ownership percentage     36.00%
Equity method investment   $ 140 $ 137
Subsequent Event      
Related Party Transaction      
Proceeds from Sale of Equity Method Investments $ 367