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Organization and Basis of Presentation (Non-Consolidated Variable Interest Entities) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Investments in equity method investees $ 180 $ 165
Notes receivable 400 331
Variable interest entity, non-consolidated    
Variable Interest Entity [Line Items]    
Investments in equity method investees 125 137
Notes receivable 15 15
Future funding commitments $ 1 $ 2