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Other Assets - Balances (Details) - Investment Management - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Equity Method Investments          
Investments $ 1,885   $ 1,885   $ 1,915
Income (loss) $ 54 $ 61 $ 110 $ 86