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Variable Interest Entities - Variable Interest Entities Information (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Total Assets $ 188,281 $ 189,813
Total Liabilities 173,644 176,359
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total Assets 1,149 1,798
Total Liabilities 1 1
Variable Interest Entity, Not Primary Beneficiary | LIHTC Investments    
Variable Interest Entity [Line Items]    
Total Assets 8,904 8,227
Total Liabilities 3,848 3,091
Maximum Exposure to Loss 2,768 2,370
Variable Interest Entity, Not Primary Beneficiary | Principal investments: Indirect    
Variable Interest Entity [Line Items]    
Total Assets 2,741 6,636
Total Liabilities 91 90
Maximum Exposure to Loss $ 18 $ 43