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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Variable Interest Entity [Line Items]      
Investment in unconsolidated entities, maximum exposure $ 5   $ 4
Capital contributions, loans or advances 21 $ 30  
USCC EIP LLC      
Variable Interest Entity [Line Items]      
Capital contributions, loans or advances $ 9 $ 10