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Policyholder Account Balances - Range of Guaranteed Minimum Crediting Rate (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 221,445 $ 219,269      
Group Life - Term | Group Benefits          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 7,632 7,692 $ 8,028 $ 7,893  
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 $ 5,430 $ 5,507 $ 5,680    
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 $ 1,409 $ 1,269 $ 1,376    
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 $ 758 $ 805 $ 845    
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 GMCR | Group Benefits          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 35 $ 111 $ 127    
Group Life - Term | At GMCR | Group Benefits          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 2,385 1,923 2,106    
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 456 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 1,247 1,196 1,303    
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 682 727 803    
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 172 96 1,026    
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 72 86 973    
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 100 9 52    
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 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 916 968 4,503    
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 816 863 4,471    
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 61 62 21    
Group Life - Term | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 4% | Group Benefits          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 39 43 11    
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 4,124 4,594 266    
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 4,086 4,558 236    
Group Life - Term | Equal to or greater than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Group Benefits          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 1 2 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 37 34 30    
Capital Markets Investment Products and Stable Value GICs | RIS          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 63,715 64,140 63,723 62,521  
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 $ 2,675 $ 2,622 $ 3,554    
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% 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% 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 $ 61,040 $ 61,518 $ 60,169    
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 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 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 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 0    
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0.50% but less than 1.50% above GMCR | RIS          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 1 1    
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 0% but less than 2% | RIS          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 0 1 1    
Capital Markets Investment Products and Stable Value GICs | Equal to or greater than 1.50% above GMCR | RIS          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 2,675 2,621 3,553    
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 2,675 2,621 3,553    
Annuities and Risk Solutions | RIS          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 20,699 17,711 15,549 14,431 $ 144
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 $ 2,457 $ 1,671 $ 1,296    
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% 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% 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 $ 1,344 $ 820 $ 839    
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% 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% 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 $ 4,633 $ 4,633 $ 4,635    
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% 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 $ 12,265 $ 10,587 $ 8,779    
Annuities and Risk Solutions | At GMCR | RIS          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 4,528 4,595 4,747    
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 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 195 249 301    
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 4,333 4,346 4,446    
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 32 34 161    
Annuities and Risk Solutions | Greater than 0% but less than 0.50% above GMCR | Equal to or greater than 0% but less than 2% | RIS          
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% | RIS          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 32 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 0 122    
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 761 407 251    
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 11 20 64    
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 456 105 124    
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 294 282 63    
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 3,113 2,088 1,611    
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 2,446 1,651 1,232    
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 661 432 375    
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 6 5 4    
Universal and Variable Universal Life | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 50,801 49,739 46,417 46,590  
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 $ 11,618 $ 11,896 $ 11,254    
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 $ 38,464 $ 37,036 $ 34,460    
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 $ 239 $ 250 $ 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% 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 $ 480 $ 557 $ 438    
Universal and Variable Universal Life | At GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 17,415 16,822 32,414    
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 9,789 10,640 10,965    
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 7,387 5,932 21,184    
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 239 250 265    
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 15,822 15,658 2,923    
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 15 24 76    
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 15,807 15,634 2,847    
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 5,452 8,032 5,721    
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 240 231 138    
Universal and Variable Universal Life | Equal to or greater than 0.50% but less than 1.50% above GMCR | Equal to or greater than 2% but less than 4% | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 5,212 7,801 5,583    
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 11,632 8,670 4,921    
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 1,574 1,001 75    
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 10,058 7,669 4,846    
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 38,421 36,863 32,454 30,976  
Fixed Annuity | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 10,142 11,537 13,286 14,398  
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 $ 37,242 $ 35,523 $ 31,017    
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 $ 658 $ 973 $ 962    
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 $ 4 $ 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% 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 $ 7,946 $ 8,899 $ 10,483    
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 $ 1,139 $ 1,231 $ 1,309    
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 GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 1,175 $ 1,335 $ 1,431    
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 399 434 532    
Fixed Annuity | At GMCR | Asia          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 328 322 438    
Fixed Annuity | At GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 2,369 1,857 11,583    
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 328 322 438    
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 2 36 934    
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 0    
Fixed Annuity | At GMCR | Equal to or greater than 2% but less than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 1,639 1,033 9,388    
Fixed Annuity | At GMCR | Equal to or greater than 4% | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 728 788 1,261    
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 538 589 670    
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 6,214 7,923 939    
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 534 584 664    
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 140 307 4    
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 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 5,675 7,205 892    
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 399 411 43    
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 4,808 6,274 7,160    
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 978 869 204    
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 4,808 6,274 7,160    
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 441 378 8    
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 525 459 191    
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 12 32 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 31,572 28,343 22,755    
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 182 454 28    
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 31,572 28,343 22,755    
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 75 252 16    
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 107 202 12    
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 2,337 2,720 2,802 4,215  
Life and Other | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 11,132 11,641 12,402 $ 12,699  
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 $ 64 $ 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% 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 $ 5,028 $ 5,453 $ 6,020    
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 $ 5,407 $ 5,616 $ 5,806    
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 GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance $ 633 $ 501 $ 501    
Life and Other | At GMCR | MetLife Holdings          
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]          
Policyholder account balance 8,922 9,519 10,278    
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 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 4,062 4,453 5,025    
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 4,860 5,066 5,253    
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 297 295 292    
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 20    
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 175 171 144    
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 122 124 128    
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 677 709 911    
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 14 16 50    
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 260 280 441    
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 403 413 420    
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 603 617 420    
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 50 55 5    
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 531 549 410    
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 $ 22 $ 13 $ 5