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Policyholder Account Balances - Range of Guaranteed Minimum Crediting Rate (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 219,269 $ 210,597   $ 211,737  
Group Life - Term | Group Benefits          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 7,692 8,028 $ 7,893 7,586 $ 7,586
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 $ 5,507 $ 5,680 $ 5,495    
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% 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% 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 $ 1,269 $ 1,376 $ 1,447    
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% 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% 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 $ 805 $ 845 $ 822    
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% 4.00%    
Group Life - Term | Products with either a fixed rate or no guaranteed minimum crediting rate | Group Benefits          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 111 $ 127 $ 129    
Group Life - Term | At GMCR | Group Benefits          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 1,923 2,106 7,396    
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 5,229    
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 1,196 1,303 1,374    
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 727 803 793    
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 96 1,026 185    
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 86 973 135    
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 52 50    
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 1 1 0    
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 968 4,503 23    
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 863 4,471 0    
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 62 21 23    
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 43 11 0    
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 4,594 266 160    
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 4,558 236 131    
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 0 0    
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 30 29    
Capital Markets Investment Products and Stable Value GICs | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 64,140 63,723 62,521 62,908 62,908
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 2,622 $ 3,554 $ 4,784    
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance, range of guaranteed minimum credit rating 0.00% 0.00% 0.00%    
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance, range of guaranteed minimum credit rating 2.00% 2.00% 2.00%    
Capital Markets Investment Products and Stable Value GICs | Products with either a fixed rate or no guaranteed minimum crediting rate | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 61,518 $ 60,169 $ 57,737    
Capital Markets Investment Products and Stable Value GICs | At GMCR | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 0 0    
Capital Markets Investment Products and Stable Value GICs | At GMCR | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 0 0    
Capital Markets Investment Products and Stable Value GICs | Greater than 0% but less than 0.50% above GMCR | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 0 632    
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% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 0 632    
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0.50% but less than 1.50% above GMCR | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 1 1 4,142    
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% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 1 1 4,142    
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 1.50% above GMCR | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 2,621 3,553 10    
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% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 2,621 3,553 10    
Annuities and Risk Solutions | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 17,711 15,549 14,431 13,643 13,643
Annuities and Risk Solutions | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 1,671 $ 1,296 $ 605    
Annuities and Risk Solutions | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance, range of guaranteed minimum credit rating 0.00% 0.00% 0.00%    
Annuities and Risk Solutions | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance, range of guaranteed minimum credit rating 2.00% 2.00% 2.00%    
Annuities and Risk Solutions | Equal to or greater than 2% but less than 4% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 820 $ 839 $ 888    
Annuities and Risk Solutions | Equal to or greater than 2% but less than 4% | Retirement and Income Solutions | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance, range of guaranteed minimum credit rating 2.00% 2.00% 2.00%    
Annuities and Risk Solutions | Equal to or greater than 2% but less than 4% | Retirement and Income Solutions | Maximum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance, range of guaranteed minimum credit rating 4.00% 4.00% 4.00%    
Annuities and Risk Solutions | Equal to or greater than 4% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 4,633 $ 4,635 $ 4,620    
Annuities and Risk Solutions | Equal to or greater than 4% | Retirement and Income Solutions | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance, range of guaranteed minimum credit rating 4.00% 4.00% 4.00%    
Annuities and Risk Solutions | Products with either a fixed rate or no guaranteed minimum crediting rate | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 10,587 $ 8,779 $ 8,318    
Annuities and Risk Solutions | At GMCR | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 4,595 4,747 4,693    
Annuities and Risk Solutions | At GMCR | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 0 0    
Annuities and Risk Solutions | At GMCR | Equal to or greater than 2% but less than 4% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 249 301 258    
Annuities and Risk Solutions | At GMCR | Equal to or greater than 4% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 4,346 4,446 4,435    
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 34 161 162    
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 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% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 34 39 36    
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 4% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 122 126    
Annuities and Risk Solutions | Equal to or greater than 0.50% but less than 1.50% above GMCR | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 407 251 294    
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% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 20 64 115    
Annuities and Risk Solutions | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 105 124 125    
Annuities and Risk Solutions | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 4% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 282 63 54    
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 2,088 1,611 964    
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 1,651 1,232 490    
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 432 375 469    
Annuities and Risk Solutions | Equal to or greater than 1.50% above GMCR | Equal to or greater than 4% | Retirement and Income Solutions          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 5 4 5    
Universal and Variable Universal Life | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 49,739 46,417 46,590 43,868 43,868
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 $ 11,896 $ 11,254 $ 11,906    
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% 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% 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 $ 37,036 $ 34,460 $ 33,974    
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% 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% 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 $ 250 $ 265 $ 282    
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% 4.00%    
Universal and Variable Universal Life | Products with either a fixed rate or no guaranteed minimum crediting rate | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 557 $ 438 $ 428    
Universal and Variable Universal Life | At GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 16,822 32,414 33,708    
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 10,640 10,965 11,754    
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 5,932 21,184 21,672    
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 250 265 282    
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 15,658 2,923 2,777    
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 24 76 152    
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 15,634 2,847 2,625    
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 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 8,032 5,721 5,160    
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 231 138 0    
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 7,801 5,583 5,160    
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 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 8,670 4,921 4,517    
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 1,001 75 0    
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 7,669 4,846 4,517    
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 0    
Fixed Annuity | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 36,863 32,454 30,976 31,422 31,422
Fixed Annuity | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 11,537 13,286 14,398 15,234 15,234
Fixed Annuity | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 35,523 $ 31,017 $ 29,334    
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% 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% 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 $ 973 $ 962 $ 1,098    
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% 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% 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 $ 8    
Fixed Annuity | Equal to or greater than 2% but less than 4% | Asia | Minimum          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance, range of guaranteed minimum credit rating 2.00% 2.00% 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% 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 $ 8,899 $ 10,483 $ 11,176    
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% 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% 4.00%    
Fixed Annuity | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 1,231 $ 1,309 $ 1,352    
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% 4.00%    
Fixed Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 1,335 $ 1,431 $ 1,634    
Fixed Annuity | Products with either a fixed rate or no guaranteed minimum crediting rate | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 434 532 772    
Fixed Annuity | At GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 322 438 272    
Fixed Annuity | At GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 1,857 11,583 13,052    
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 322 438 264    
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 36 934 1,066    
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 8    
Fixed Annuity | At GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 1,033 9,388 10,679    
Fixed Annuity | At GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 788 1,261 1,307    
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 589 670 1,153    
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 7,923 939 346    
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 584 664 1,153    
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 307 4 7    
Fixed Annuity | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 5 6 0    
Fixed Annuity | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 7,205 892 299    
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 411 43 40    
Fixed Annuity | Equal to or greater than 0.50% but less than 1.50% above GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 6,274 7,160 8,100    
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 869 204 216    
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 6,274 7,160 8,100    
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 378 8 14    
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 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 459 191 197    
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 32 5 5    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 28,343 22,755 19,817    
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 454 28 12    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 28,343 22,755 19,817    
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 252 16 11    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 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 202 12 1    
Fixed Annuity | Equal to or greater than 1.50% above GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 0 0    
Variable Annuity | EMEA          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 2,720 2,802 4,215 4,779 4,779
Life and Other | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 11,641 12,402 12,699 $ 12,856 $ 12,856
Life and Other | Equal to or greater than 0% but less than 2% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 71 $ 75 $ 34    
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% 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% 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 $ 5,453 $ 6,020 $ 6,151    
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% 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% 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 $ 5,616 $ 5,806 $ 6,013    
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% 4.00%    
Life and Other | Products with either a fixed rate or no guaranteed minimum crediting rate | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 501 $ 501 $ 501    
Life and Other | At GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 9,519 10,278 10,596    
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 26    
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 4,453 5,025 5,122    
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 5,066 5,253 5,448    
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 295 292 285    
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 20 8    
Life and Other | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 171 144 145    
Life and Other | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 124 128 132    
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 709 911 740    
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 16 50 0    
Life and Other | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 280 441 313    
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 413 420 427    
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 617 420 577    
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 5 0    
Life and Other | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 549 410 571    
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 $ 13 $ 5 $ 6