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Organization and Basis of Presentation (Non-Consolidated Variable Interest Entities) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Investments in equity method investees $ 186 $ 177
Notes receivable 304 261
Variable interest entity, non-consolidated    
Variable Interest Entity [Line Items]    
Investments in equity method investees 170 159
Notes receivable 16 21
Future funding commitments $ 3 $ 6