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Investments - Other Segments and Holding Company (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Schedule of Investments          
Investments $ 3,300   $ 3,300   $ 6,809
Other Segments and Holding Company          
Schedule of Investments          
Investments 115   115   90
Portion of unrealized (losses) gains that relates to equity securities still held 0 $ 0 0 $ 61  
Equity method investments | Other Segments and Holding Company          
Schedule of Investments          
Investments 101   101   76
Held-to-maturity Securities [Member] | Other Segments and Holding Company          
Schedule of Investments          
Investments 11   11   11
Other investments measured at fair value | Other Segments and Holding Company          
Schedule of Investments          
Investments $ 3   $ 3   $ 3