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Investments - Other Segments and Holding Company (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Schedule of Investments          
Investments $ 4,937   $ 4,937   $ 6,809
Other Segments and Holding Company          
Schedule of Investments          
Investments 116   116   90
Portion of unrealized (losses) gains that relates to equity securities still held 0 $ 3 0 $ 61  
Equity method investments | Other Segments and Holding Company          
Schedule of Investments          
Investments 102   102   76
Other investments | Other Segments and Holding Company          
Schedule of Investments          
Investments $ 14   $ 14   $ 14