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Investments - Investments - Past-Due Mortgage Loans (Details) - Commercial Loan [Member] - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 6,405 $ 6,138
Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Financing Receivable, before Allowance for Credit Loss $ 0 $ 0