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Non-Consolidated Affiliates - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2018
Fair Value Measured at Net Asset Value Per Share    
Related Party Transaction [Line Items]    
Investments $ 7 $ 15
Equity method investments $ 2  
YFVIC    
Related Party Transaction [Line Items]    
Equity method investment, ownership percentage 50.00%