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Policyholder Account Balances - Range of Guaranteed Minimum Crediting Rate (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 219,543 $ 219,269    
Group Life - Term | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 7,644 7,692 $ 7,875 $ 8,028
Group Life - Term | Equal to or greater than 0% but less than 2% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 5,550   $ 5,604  
Group Life - Term | Equal to or greater than 0% but less than 2% | Group Benefits | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance range of guaranteed minimum credit rating 0.00%   0.00%  
Group Life - Term | Equal to or greater than 0% but less than 2% | Group Benefits | Maximum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance range of guaranteed minimum credit rating 2.00%   2.00%  
Group Life - Term | Equal to or greater than 2% but less than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 1,286   $ 1,327  
Group Life - Term | Equal to or greater than 2% but less than 4% | Group Benefits | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance range of guaranteed minimum credit rating 2.00%   2.00%  
Group Life - Term | Equal to or greater than 2% but less than 4% | Group Benefits | Maximum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance range of guaranteed minimum credit rating 4.00%   4.00%  
Group Life - Term | Equal to or greater than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 770   $ 824  
Group Life - Term | Equal to or greater than 4% | Group Benefits | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance range of guaranteed minimum credit rating 4.00%   4.00%  
Group Life - Term | Products with either a fixed rate or no GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 38   $ 120  
Group Life - Term | At GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 1,914   1,998  
Group Life - Term | At GMCR | Equal to or greater than 0% but less than 2% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   0  
Group Life - Term | At GMCR | Equal to or greater than 2% but less than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 1,217   1,252  
Group Life - Term | At GMCR | Equal to or greater than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 697   746  
Group Life - Term | Greater than 0% but less than 0.50% above GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 166   90  
Group Life - Term | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 157   79  
Group Life - Term | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 9   10  
Group Life - Term | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   1  
Group Life - Term | Equal to or greater than 0.50% but less than 1.50% above GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 917   1,016  
Group Life - Term | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 819   910  
Group Life - Term | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 59   63  
Group Life - Term | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 39   43  
Group Life - Term | Equal to or greater than 1.50% above GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 4,609   4,651  
Group Life - Term | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 4,574   4,615  
Group Life - Term | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 1   2  
Group Life - Term | Equal to or greater than 1.50% above GMCR | Equal to or greater than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 34   34  
Capital Markets Investment Products and Stable Value GICs | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 64,945 64,140 64,103 63,723
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0% but less than 2% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 2,647   $ 2,596  
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0% but less than 2% | RIS | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance range of guaranteed minimum credit rating 0.00%   0.00%  
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0% but less than 2% | RIS | Maximum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance range of guaranteed minimum credit rating 2.00%   2.00%  
Capital Markets Investment Products and Stable Value GICs | Products with either a fixed rate or no GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 62,298   $ 61,507  
Capital Markets Investment Products and Stable Value GICs | At GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   0  
Capital Markets Investment Products and Stable Value GICs | At GMCR | Equal to or greater than 0% but less than 2% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   0  
Capital Markets Investment Products and Stable Value GICs | Greater than 0% but less than 0.50% above GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   0  
Capital Markets Investment Products and Stable Value GICs | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   0  
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0.50% but less than 1.50% above GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   1  
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   1  
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 1.50% above GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 2,647   2,595  
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 2,647   2,595  
Annuities and Risk Solutions | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 18,797 17,711 16,693 15,549
Annuities and Risk Solutions | Equal to or greater than 0% but less than 2% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 2,067   $ 1,525  
Annuities and Risk Solutions | Equal to or greater than 0% but less than 2% | RIS | 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% | RIS | 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% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 766   $ 840  
Annuities and Risk Solutions | Equal to or greater than 2% but less than 4% | RIS | 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% | RIS | 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% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 4,641   $ 4,669  
Annuities and Risk Solutions | Equal to or greater than 4% | RIS | 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 GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 11,323   $ 9,659  
Annuities and Risk Solutions | At GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 4,440   4,666  
Annuities and Risk Solutions | At GMCR | Equal to or greater than 0% but less than 2% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   0  
Annuities and Risk Solutions | At GMCR | Equal to or greater than 2% but less than 4% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 201   227  
Annuities and Risk Solutions | At GMCR | Equal to or greater than 4% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 4,239   4,439  
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 35   152  
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 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% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 35   35  
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 4% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 0   117  
Annuities and Risk Solutions | Equal to or greater than 0.50% but less than 1.50% above GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 525   290  
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% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 19   53  
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% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 109   130  
Annuities and Risk Solutions | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 4% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 397   107  
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 2,474   1,926  
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 2,048   1,472  
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 421   448  
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Equal to or greater than 4% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 5   6  
Universal and Variable Universal Life | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 49,229 49,739 46,851 46,417
Universal and Variable Universal Life | Equal to or greater than 0% but less than 2% | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 10,960   $ 10,633  
Universal and Variable Universal Life | 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 Universal Life | 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 Universal Life | Equal to or greater than 2% but less than 4% | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 37,501   $ 35,445  
Universal and Variable Universal Life | 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 Universal Life | 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 Universal Life | Equal to or greater than 4% | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 242   $ 261  
Universal and Variable Universal Life | 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 Universal Life | Products with either a fixed rate or no GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 526   $ 512  
Universal and Variable Universal Life | At GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 17,086   31,331  
Universal and Variable Universal Life | 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 9,431   10,211  
Universal and Variable Universal Life | 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 7,413   20,859  
Universal and Variable Universal Life | At GMCR | Equal to or greater than 4% | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 242   261  
Universal and Variable Universal Life | Greater than 0% but less than 0.50% above GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 15,631   2,964  
Universal and Variable Universal Life | 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 18   45  
Universal and Variable Universal Life | 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 15,613   2,919  
Universal and Variable Universal Life | 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 0   0  
Universal and Variable Universal Life | 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 5,716   5,921  
Universal and Variable Universal Life | 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 230   138  
Universal and Variable Universal Life | 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 5,486   5,783  
Universal and Variable Universal Life | 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 0   0  
Universal and Variable Universal Life | Equal to or greater than 1.50% above GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 10,270   6,123  
Universal and Variable Universal Life | 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 1,281   239  
Universal and Variable Universal Life | 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 8,989   5,884  
Universal and Variable Universal Life | 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 0   0  
Fixed Annuity | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 37,629 36,863 35,124 32,454
Fixed Annuity | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 10,747 11,537 12,410 13,286
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 $ 36,427   $ 33,798  
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 $ 683   $ 846  
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 $ 5   $ 6  
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 $ 8,479   $ 9,831  
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 $ 1,187   $ 1,278  
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 GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 1,197   $ 1,320  
Fixed Annuity | Products with either a fixed rate or no GMCR | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 398   455  
Fixed Annuity | At GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 394   343  
Fixed Annuity | At GMCR | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 1,812   5,343  
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 394   343  
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 4   444  
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 0   0  
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 1,049   3,917  
Fixed Annuity | At GMCR | Equal to or greater than 4% | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 759   982  
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 492   609  
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 7,359   5,882  
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 487   603  
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 195   158  
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 5   6  
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 6,760   5,447  
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 404   277  
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 5,486   6,795  
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 942   633  
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 5,486   6,795  
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 446   219  
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 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 472   395  
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 24   19  
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 30,060   26,057  
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 236   97  
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 30,060   26,057  
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 38   25  
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 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 198   72  
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 0   0  
Variable Annuity | EMEA        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 2,552 2,720 2,761 2,802
Life and Other | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 11,303 $ 11,641 12,044 $ 12,402
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 $ 72   $ 77  
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 $ 5,224   $ 5,754  
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 $ 5,506   $ 5,712  
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 GMCR | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 501   $ 501  
Life and Other | At GMCR | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 9,202   9,893  
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 0   0  
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 4,242   4,735  
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 4,960   5,158  
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 296   299  
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 0   0  
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 172   172  
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 124   127  
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 695   725  
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 18   21  
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 270   289  
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 407   415  
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 609   626  
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 54   56  
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 540   558  
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 $ 15   $ 12