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Investments - Other Segments and Holding Company (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Schedule of Investments          
Investments $ 4,877   $ 4,877   $ 9,151
Other Segments and Holding Company          
Schedule of Investments          
Investments 91   91   199
Portion of unrealized (losses) gains that relates to equity securities still held 0 $ (86) 61 $ (42)  
Equity method investments | Other Segments and Holding Company          
Schedule of Investments          
Investments 77   77   79
Other investments | Other Segments and Holding Company          
Schedule of Investments          
Investments $ 14   $ 14   $ 120