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Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 7,633   $ 7,459
Construction Loan $ 50   $ 46
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00%   100.00%
Real Estate Owned, Transfer to Real Estate Owned $ 21 $ 17  
Financial Asset, Equal to or Greater than 90 Days Past Due      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 23 $ 19  
Mortgage Loans By Credit Quality Indicator Range One [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 4,208   $ 4,017
Construction Loan $ 50   $ 46
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 55.10%   53.90%
Mortgage Loans By Credit Quality Indicator Range Two [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 2,148   $ 2,145
Construction Loan $ 0   $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 28.20%   28.80%
Mortgage Loans By Credit Quality Indicator Range Three [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 924   $ 929
Construction Loan $ 0   $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 12.10%   12.40%
Mortgage Loans By Credit Quality Indicator Range Four [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 353   $ 368
Construction Loan $ 0   $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 4.60%   4.90%
Debt Service Coverage Ratio Range One [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 6,808   $ 6,660
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 3,820   3,672
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,950   1,947
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 849   843
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 189   198
Debt Service Coverage Ratio Range Two [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 541   548
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 298   272
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 160   154
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 28   52
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 55   70
Debt Service Coverage Ratio Range Three [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 234   205
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 40   27
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 38   44
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 47   34
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 109   $ 100