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Policyholder Account Balances - Range of Guaranteed Minimum Crediting Rate (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 235,312 $ 221,445    
Group Life | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 7,557 7,632 $ 7,676 $ 7,692
Group Life | Equal to or greater than 0% but less than 2% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 5,427   $ 5,546  
Group Life | Equal to or greater than 0% but less than 2% | Group Benefits | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Range of Guaranteed Minimum Credit Rating 0.00%   0.00%  
Group Life | Equal to or greater than 0% but less than 2% | Group Benefits | Maximum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Range of Guaranteed Minimum Credit Rating 2.00%   2.00%  
Group Life | Equal to or greater than 2% but less than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 1,333   $ 1,334  
Group Life | Equal to or greater than 2% but less than 4% | Group Benefits | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Range of Guaranteed Minimum Credit Rating 2.00%   2.00%  
Group Life | Equal to or greater than 2% but less than 4% | Group Benefits | Maximum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Range of Guaranteed Minimum Credit Rating 4.00%   4.00%  
Group Life | Equal to or greater than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 763   $ 759  
Group Life | Equal to or greater than 4% | Group Benefits | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Range of Guaranteed Minimum Credit Rating 4.00%   4.00%  
Group Life | Products with either a fixed rate or no GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 34   $ 37  
Group Life | At GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 2,352   2,406  
Group Life | 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 489   456  
Group Life | 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 1,180   1,266  
Group Life | At GMCR | Equal to or greater than 4% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 683   684  
Group Life | Greater than 0% but less than 0.50% above GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 195   80  
Group Life | 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 77   72  
Group Life | 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 93   8  
Group Life | 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 25   0  
Group Life | 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 825   975  
Group 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% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 762   877  
Group 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% | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 60   59  
Group Life | 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 3   39  
Group Life | Equal to or greater than 1.50% above GMCR | Group Benefits        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 4,151   4,178  
Group Life | 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 4,099   4,141  
Group Life | 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 0   1  
Group Life | 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 52   36  
Capital Markets Investment Products and Stable Value GICs | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 66,052 63,715 65,330 64,140
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 $ 2,728   $ 2,754  
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]        
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]        
Range of Guaranteed Minimum Credit Rating 2.00%   2.00%  
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 2% but less than 4% | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance $ 0   $ 148  
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 2% but less than 4% | RIS | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Range of Guaranteed Minimum Credit Rating 2.00%   2.00%  
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 2% but less than 4% | RIS | Maximum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Range of Guaranteed Minimum Credit Rating 4.00%   4.00%  
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 $ 63,324   $ 62,428  
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 | 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 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 | 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 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   0  
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   0  
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 2% but less than 4% | 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 1.50% above GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 2,728   2,902  
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 2,728   2,754  
Capital Markets Investment Products and Stable Value GICs | 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 0   148  
Annuities and Risk Solutions | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 22,824 20,699 19,572 17,711
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 $ 2,983   $ 2,422  
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]        
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]        
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 $ 1,880   $ 759  
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]        
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]        
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 $ 4,564   $ 4,609  
Annuities and Risk Solutions | Equal to or greater than 4% | RIS | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
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 $ 13,397   $ 11,782  
Annuities and Risk Solutions | At GMCR | RIS        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 4,284   4,329  
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 161   198  
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 4,123   4,131  
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 70   35  
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 59   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 11   0  
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 876   600  
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 8   19  
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 445   109  
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 423   472  
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 4,197   2,826  
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 2,975   2,403  
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 1,215   417  
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 7   6  
Universal and Variable Universal Life | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 54,666 50,801 51,756 49,739
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 $ 12,631   $ 12,383  
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]        
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]        
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 $ 39,945   $ 38,606  
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]        
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]        
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 $ 230   $ 241  
Universal and Variable Universal Life | Equal to or greater than 4% | Asia | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
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 $ 1,860   $ 526  
Universal and Variable Universal Life | At GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 18,067   18,751  
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 10,438   10,681  
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 7,399   7,829  
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 230   241  
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 16,045   15,748  
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 28   18  
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 16,017   15,730  
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 5,242   5,632  
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 248   235  
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 4,994   5,397  
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 13,452   11,099  
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 1,917   1,449  
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 11,535   9,650  
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 42,708 38,421 38,742 36,863
Fixed Annuity | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 9,451 10,142 10,437 11,537
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 $ 41,550   $ 37,448  
Fixed Annuity | Equal to or greater than 0% but less than 2% | Asia | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
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]        
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 $ 684   $ 665  
Fixed Annuity | Equal to or greater than 0% but less than 2% | MetLife Holdings | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
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]        
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 $ 4   $ 5  
Fixed Annuity | Equal to or greater than 2% but less than 4% | Asia | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
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]        
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 $ 7,324   $ 8,220  
Fixed Annuity | Equal to or greater than 2% but less than 4% | MetLife Holdings | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
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]        
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 $ 1,088   $ 1,166  
Fixed Annuity | Equal to or greater than 4% | MetLife Holdings | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
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 $ 1,154   $ 1,289  
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 355   386  
Fixed Annuity | At GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 268   385  
Fixed Annuity | At GMCR | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 3,510   2,126  
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 268   385  
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 40   3  
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 2,755   1,378  
Fixed Annuity | At GMCR | Equal to or greater than 4% | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 715   745  
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 430   465  
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 4,398   6,758  
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 426   460  
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 10   166  
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 4   5  
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 4,022   6,188  
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 366   404  
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 4,283   5,250  
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 929   962  
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 4,283   5,250  
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 473   444  
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 449   501  
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 7   17  
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Asia        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 36,573   31,353  
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 259   205  
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 36,573   31,353  
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 161   52  
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 98   153  
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 2,297 2,337 2,617 2,720
Life and Other | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 10,716 $ 11,132 11,284 $ 11,641
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 $ 67   $ 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]        
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]        
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 $ 4,766   $ 5,131  
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]        
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]        
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 $ 5,239   $ 5,447  
Life and Other | Equal to or greater than 4% | MetLife Holdings | Minimum        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
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 $ 644   $ 631  
Life and Other | At GMCR | MetLife Holdings        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder account balance 8,653   9,070  
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 3,828   4,159  
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 4,825   4,911  
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 569   293  
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 175   171  
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 394   122  
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 634   687  
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 12   17  
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 621   265  
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 1   405  
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 216   603  
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 55   58  
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 142   536  
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 $ 19   $ 9