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Related Party Transactions - Narratives (Details) - USD ($)
$ in Millions
Apr. 29, 2021
Dec. 31, 2020
Cardinal Holdings    
Related Party Transaction    
Ownership percentage   36.00%
Equity method investments   $ 137
Cardinal Holdings | Discontinued Operations, Disposed of by Sale    
Related Party Transaction    
Cash proceeds $ 367  
Gain in other income (expense) $ 225