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Investments - Mortgage Loans, Loan to Value Ratio (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans   $ 24,148
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans $ 20,108 16,897
Financing Receivable, Year One, Originated, Current Fiscal Year   6,055
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year   1,852
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year   4,129
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year   2,731
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year   1,042
Financing Receivable, Originated, More than Five Years before Current Fiscal Year   1,255
Financing Receivable, before Allowance for Credit Loss   17,064
Commercial Real Estate Portfolio Segment [Member] | Commercial mortgage loans, excluding loans under development    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year   5,808
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year   1,738
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year   4,054
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year   2,668
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year   1,042
Financing Receivable, Originated, More than Five Years before Current Fiscal Year   1,255
Financing Receivable, before Allowance for Credit Loss $ 21,061 16,565
Commercial Real Estate Portfolio Segment [Member] | Commercial mortgage loans, excluding loans under development | LTV 81 to 100 Percent [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year   0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year   0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year   0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year   0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year   25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year   0
Financing Receivable, before Allowance for Credit Loss   25
Commercial Real Estate Portfolio Segment [Member] | Commercial mortgage loans, excluding loans under development | LTV 61 to 70 Percent [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year   1,748
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year   544
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year   1,786
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year   1,326
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year   369
Financing Receivable, Originated, More than Five Years before Current Fiscal Year   71
Financing Receivable, before Allowance for Credit Loss   5,844
Commercial Real Estate Portfolio Segment [Member] | Commercial mortgage loans, excluding loans under development | LTV Less Than 50 Percent [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year   491
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year   211
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year   633
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year   293
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year   166
Financing Receivable, Originated, More than Five Years before Current Fiscal Year   957
Financing Receivable, before Allowance for Credit Loss   2,751
Commercial Real Estate Portfolio Segment [Member] | Commercial mortgage loans, excluding loans under development | LTV 50 to 60 Percent [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year   2,127
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year   566
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year   1,275
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year   629
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year   381
Financing Receivable, Originated, More than Five Years before Current Fiscal Year   191
Financing Receivable, before Allowance for Credit Loss   5,169
Commercial Real Estate Portfolio Segment [Member] | Commercial mortgage loans, excluding loans under development | LTV 71 to 80 Percent [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year   1,442
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year   417
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year   360
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year   420
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year   101
Financing Receivable, Originated, More than Five Years before Current Fiscal Year   0
Financing Receivable, before Allowance for Credit Loss   2,740
Commercial Real Estate Portfolio Segment [Member] | Commercial mortgage loans, excluding loans under development | LTV Greater than 100 Percent [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year   0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year   0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year   0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year   0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year   0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year   36
Financing Receivable, before Allowance for Credit Loss   $ 36