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Policyholder Account Balances - Range of Guaranteed Minimum Crediting Rate (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 219,168 $ 219,269    
Group Life - Term | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 7,747 7,692 $ 7,965 $ 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 $ 5,621   $ 5,652  
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 $ 1,313   $ 1,352  
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 $ 774   $ 836  
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 $ 39   $ 125  
Group Life - Term | At GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 1,943   2,036  
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 1,242   1,277  
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 701   759  
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 163   88  
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 154   77  
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 939   1,041  
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 839   935  
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 60   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 40   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 4,663   4,675  
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 4,628   4,640  
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 2   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 33   33  
Capital Markets Investment Products and Stable Value GICs | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 64,269 64,140 63,284 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 $ 1,999   $ 1,836  
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 $ 62,270   $ 61,448  
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 1   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 1   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 1,998   1,835  
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 1,998   1,835  
Annuities and Risk Solutions | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 18,266 17,711 16,128 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 $ 1,854   $ 1,482  
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 $ 800   $ 835  
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 $ 4,655   $ 4,681  
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 $ 10,957   $ 9,130  
Annuities and Risk Solutions | At GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 4,504   4,690  
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 244   230  
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 4,260   4,460  
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 34   159  
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 34   39  
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   120  
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 516   279  
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 20   58  
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 106   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% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 390   96  
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 2,255   1,870  
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 1,834   1,424  
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 416   441  
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   5  
Universal and Variable Universal Life | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 49,484 49,739 46,770 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 $ 11,360   $ 11,266  
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 $ 37,313   $ 34,756  
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 $ 246   $ 265  
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 $ 565   $ 483  
Universal and Variable Universal Life | At GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 17,938   32,499  
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 9,960   10,978  
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 7,732   21,256  
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 246   265  
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 15,665   2,924  
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 21   67  
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 15,644   2,857  
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 5,780   5,866  
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   136  
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 5,550   5,730  
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 9,536   4,998  
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 1,149   85  
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 8,387   4,913  
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 36,969 36,863 34,272 32,454
Fixed Annuity | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 11,129 11,537 12,818 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 $ 35,704   $ 32,858  
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 $ 745   $ 908  
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 $ 8,764   $ 10,132  
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 $ 1,206   $ 1,296  
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 $ 1,260   $ 1,408  
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 414   482  
Fixed Annuity | At GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 331   377  
Fixed Annuity | At GMCR | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 1,645   8,139  
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 331   377  
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 6   658  
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 866   6,517  
Fixed Annuity | At GMCR | Equal to or greater than 4% | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 773   964  
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 526   642  
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 7,797   3,614  
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 521   636  
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 237   90  
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 7,157   3,203  
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 403   321  
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 5,821   6,980  
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 1,012   523  
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 5,821   6,980  
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 442   136  
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 540   376  
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 30   11  
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 29,031   24,865  
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 261   60  
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 29,031   24,865  
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 60   24  
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 201   36  
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 2,631 2,720 2,845 2,802
Life and Other | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 11,486 $ 11,641 12,234 $ 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 $ 71   $ 75  
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 $ 5,343   $ 5,900  
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 $ 5,571   $ 5,758  
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 9,373   10,081  
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 4,351   4,872  
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 5,022   5,209  
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 295   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 171   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 702   733  
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 17   20  
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 275   296  
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 410   417  
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 615   620  
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   55  
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 546   560  
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   $ 5