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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Variable Interest Entity [Line Items]          
Other comprehensive income (loss), net of tax $ (418) $ (1,350) $ (893) $ 1,248  
Other investments 5,652   5,652   $ 5,015
Variable Interest Entity, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Other comprehensive income (loss), net of tax 0 $ 0 0 $ 0  
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Other investments $ 4,700   $ 4,700   $ 4,200