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Policyholder Account Balances - Range of Guaranteed Minimum Crediting Rate (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 212,569 $ 210,597     $ 211,737
Group Insurance Policy | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 7,965 8,028 $ 8,034 $ 7,893 7,586
Group Insurance Policy | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 5,652   $ 5,644    
Group Insurance Policy | Equal to or greater than 0% but less than 2% | U.S. | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 0.00%   0.00%    
Group Insurance Policy | Equal to or greater than 0% but less than 2% | U.S. | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Group Insurance Policy | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 1,352   $ 1,422    
Group Insurance Policy | Equal to or greater than 2% but less than 4% | U.S. | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Group Insurance Policy | Equal to or greater than 2% but less than 4% | U.S. | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Group Insurance Policy | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 836   $ 838    
Group Insurance Policy | Equal to or greater than 4% | U.S. | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Group Insurance Policy | Products with either a fixed rate or no guaranteed minimum crediting rate | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 125   $ 130    
Group Insurance Policy | At GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 2,036   7,481    
Group Insurance Policy | At GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   5,318    
Group Insurance Policy | At GMCR | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 1,277   1,355    
Group Insurance Policy | At GMCR | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 759   808    
Group Insurance Policy | Greater than 0% but less than 0.50% above GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 88   245    
Group Insurance Policy | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 77   194    
Group Insurance Policy | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 10   51    
Group Insurance Policy | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 1   0    
Group Insurance Policy | Equal to or greater than 0.50% but less than 1.50% above GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 1,041   16    
Group Insurance Policy | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 935   0    
Group Insurance Policy | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 63   16    
Group Insurance Policy | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 43   0    
Group Insurance Policy | Equal to or greater than 1.50% above GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 4,675   162    
Group Insurance Policy | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 4,640   132    
Group Insurance Policy | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 2   0    
Group Insurance Policy | Equal to or greater than 1.50% above GMCR | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 33   30    
CapitalMarketsInvestmentProductsandStableValueGICs | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 63,284 63,723 66,165 62,521 62,908
CapitalMarketsInvestmentProductsandStableValueGICs | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 1,836   $ 5,081    
CapitalMarketsInvestmentProductsandStableValueGICs | Equal to or greater than 0% but less than 2% | U.S. | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 0.00%   0.00%    
CapitalMarketsInvestmentProductsandStableValueGICs | Equal to or greater than 0% but less than 2% | U.S. | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
CapitalMarketsInvestmentProductsandStableValueGICs | Products with either a fixed rate or no guaranteed minimum crediting rate | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 61,448   $ 61,084    
CapitalMarketsInvestmentProductsandStableValueGICs | At GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
CapitalMarketsInvestmentProductsandStableValueGICs | At GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
CapitalMarketsInvestmentProductsandStableValueGICs | Greater than 0% but less than 0.50% above GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   300    
CapitalMarketsInvestmentProductsandStableValueGICs | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   300    
CapitalMarketsInvestmentProductsandStableValueGICs | Equal to or greater than 0.50% but less than 1.50% above GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 1   3,523    
CapitalMarketsInvestmentProductsandStableValueGICs | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 1   3,523    
CapitalMarketsInvestmentProductsandStableValueGICs | Equal to or greater than 1.50% above GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 1,835   1,258    
CapitalMarketsInvestmentProductsandStableValueGICs | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 1,835   1,258    
Annuities and Risk Solutions | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 16,128 15,549 14,385 14,431 13,643
Annuities and Risk Solutions | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 1,482   $ 608    
Annuities and Risk Solutions | Equal to or greater than 0% but less than 2% | U.S. | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 0.00%   0.00%    
Annuities and Risk Solutions | Equal to or greater than 0% but less than 2% | U.S. | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Annuities and Risk Solutions | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 835   $ 883    
Annuities and Risk Solutions | Equal to or greater than 2% but less than 4% | U.S. | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Annuities and Risk Solutions | Equal to or greater than 2% but less than 4% | U.S. | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Annuities and Risk Solutions | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 4,681   $ 4,606    
Annuities and Risk Solutions | Equal to or greater than 4% | U.S. | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Annuities and Risk Solutions | Products with either a fixed rate or no guaranteed minimum crediting rate | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 9,130   $ 8,288    
Annuities and Risk Solutions | At GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 4,690   4,722    
Annuities and Risk Solutions | At GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Annuities and Risk Solutions | At GMCR | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 230   301    
Annuities and Risk Solutions | At GMCR | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 4,460   4,421    
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 159   161    
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 39   36    
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 120   125    
Annuities and Risk Solutions | Equal to or greater than 0.50% but less than 1.50% above GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 279   296    
Annuities and Risk Solutions | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 58   115    
Annuities and Risk Solutions | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 125   125    
Annuities and Risk Solutions | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 96   56    
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 1,870   918    
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 1,424   493    
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 441   421    
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Equal to or greater than 4% | U.S.          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 5   4    
Universal And Variable Life Contracts [Member] | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 46,770 46,417 46,955 46,590 43,868
Universal And Variable Life Contracts [Member] | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 11,266   $ 11,455    
Universal And Variable Life Contracts [Member] | Equal to or greater than 0% but less than 2% | Asia | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 0.00%   0.00%    
Universal And Variable Life Contracts [Member] | Equal to or greater than 0% but less than 2% | Asia | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Universal And Variable Life Contracts [Member] | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 34,756   $ 34,768    
Universal And Variable Life Contracts [Member] | Equal to or greater than 2% but less than 4% | Asia | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Universal And Variable Life Contracts [Member] | Equal to or greater than 2% but less than 4% | Asia | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Universal And Variable Life Contracts [Member] | Equal to or greater than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 265   $ 282    
Universal And Variable Life Contracts [Member] | Equal to or greater than 4% | Asia | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Universal And Variable Life Contracts [Member] | Products with either a fixed rate or no guaranteed minimum crediting rate | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 483   $ 450    
Universal And Variable Life Contracts [Member] | At GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 32,499   33,424    
Universal And Variable Life Contracts [Member] | At GMCR | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 10,978   11,323    
Universal And Variable Life Contracts [Member] | At GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 21,256   21,819    
Universal And Variable Life Contracts [Member] | At GMCR | Equal to or greater than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 265   282    
Universal And Variable Life Contracts [Member] | Greater than 0% but less than 0.50% above GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 2,924   2,867    
Universal And Variable Life Contracts [Member] | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 67   132    
Universal And Variable Life Contracts [Member] | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 2,857   2,735    
Universal And Variable Life Contracts [Member] | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Universal And Variable Life Contracts [Member] | Equal to or greater than 0.50% but less than 1.50% above GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 5,866   5,480    
Universal And Variable Life Contracts [Member] | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 136   0    
Universal And Variable Life Contracts [Member] | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 5,730   5,480    
Universal And Variable Life Contracts [Member] | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Universal And Variable Life Contracts [Member] | Equal to or greater than 1.50% above GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 4,998   4,734    
Universal And Variable Life Contracts [Member] | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 85   0    
Universal And Variable Life Contracts [Member] | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 4,913   4,734    
Universal And Variable Life Contracts [Member] | Equal to or greater than 1.50% above GMCR | Equal to or greater than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Fixed Annuity | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 34,272 32,454 31,477 30,976 31,422
Fixed Annuity | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 12,818 13,286 14,182 14,398 15,234
Fixed Annuity | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 32,858   $ 29,881    
Fixed Annuity | Equal to or greater than 0% but less than 2% | Asia | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 0.00%   0.00%    
Fixed Annuity | Equal to or greater than 0% but less than 2% | Asia | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Fixed Annuity | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 908   $ 1,069    
Fixed Annuity | Equal to or greater than 0% but less than 2% | MetLife Holdings | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 0.00%   0.00%    
Fixed Annuity | Equal to or greater than 0% but less than 2% | MetLife Holdings | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Fixed Annuity | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 6   $ 8    
Fixed Annuity | Equal to or greater than 2% but less than 4% | Asia | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Fixed Annuity | Equal to or greater than 2% but less than 4% | Asia | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Fixed Annuity | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 10,132   $ 11,067    
Fixed Annuity | Equal to or greater than 2% but less than 4% | MetLife Holdings | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Fixed Annuity | Equal to or greater than 2% but less than 4% | MetLife Holdings | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Fixed Annuity | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 1,296   $ 1,341    
Fixed Annuity | Equal to or greater than 4% | MetLife Holdings | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Fixed Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 1,408   $ 1,588    
Fixed Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 482   705    
Fixed Annuity | At GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 377   378    
Fixed Annuity | At GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 8,139   12,935    
Fixed Annuity | At GMCR | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 377   370    
Fixed Annuity | At GMCR | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 658   1,038    
Fixed Annuity | At GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   8    
Fixed Annuity | At GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 6,517   10,601    
Fixed Annuity | At GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 964   1,296    
Fixed Annuity | Greater than 0% but less than 0.50% above GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 642   1,136    
Fixed Annuity | Greater than 0% but less than 0.50% above GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 3,614   329    
Fixed Annuity | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 636   1,136    
Fixed Annuity | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 90   7    
Fixed Annuity | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 6   0    
Fixed Annuity | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 3,203   282    
Fixed Annuity | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 321   40    
Fixed Annuity | Equal to or greater than 0.50% but less than 1.50% above GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 6,980   8,024    
Fixed Annuity | Equal to or greater than 0.50% but less than 1.50% above GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 523   201    
Fixed Annuity | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 6,980   8,024    
Fixed Annuity | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 136   13    
Fixed Annuity | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Fixed Annuity | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 376   183    
Fixed Annuity | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 11   5    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 24,865   20,351    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 60   12    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 24,865   20,351    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 24   11    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 36   1    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Variable Annuity [Member] | EMEA          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 2,845 2,802 3,769 4,215 4,779
Variable Annuity [Member] | Products with either a fixed rate or no guaranteed minimum crediting rate | EMEA          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 2,845   3,769    
Variable Annuity [Member] | At GMCR | EMEA          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Variable Annuity [Member] | Greater than 0% but less than 0.50% above GMCR | EMEA          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Variable Annuity [Member] | Equal to or greater than 0.50% but less than 1.50% above GMCR | EMEA          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Variable Annuity [Member] | Equal to or greater than 1.50% above GMCR | EMEA          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   0    
Life and Other | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 12,234 $ 12,402 12,676 $ 12,699 $ 12,856
Life and Other | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 75   $ 47    
Life and Other | Equal to or greater than 0% but less than 2% | MetLife Holdings | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 0.00%   0.00%    
Life and Other | Equal to or greater than 0% but less than 2% | MetLife Holdings | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Life and Other | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 5,900   $ 6,170    
Life and Other | Equal to or greater than 2% but less than 4% | MetLife Holdings | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 2.00%   2.00%    
Life and Other | Equal to or greater than 2% but less than 4% | MetLife Holdings | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Life and Other | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 5,758   $ 5,958    
Life and Other | Equal to or greater than 4% | MetLife Holdings | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Range of Guaranteed Minimum Credit Rating 4.00%   4.00%    
Life and Other | Products with either a fixed rate or no guaranteed minimum crediting rate | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 501   $ 501    
Life and Other | At GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 10,081   10,584    
Life and Other | At GMCR | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   39    
Life and Other | At GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 4,872   5,147    
Life and Other | At GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 5,209   5,398    
Life and Other | Greater than 0% but less than 0.50% above GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 299   284    
Life and Other | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 0   8    
Life and Other | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 172   145    
Life and Other | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 127   131    
Life and Other | Equal to or greater than 0.50% but less than 1.50% above GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 733   732    
Life and Other | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 20   0    
Life and Other | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 296   308    
Life and Other | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 417   424    
Life and Other | Equal to or greater than 1.50% above GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 620   575    
Life and Other | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 55   0    
Life and Other | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating 560   570    
Life and Other | Equal to or greater than 1.50% above GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder Account Balance, Guaranteed Minimum Credit Rating $ 5   $ 5