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INVESTMENTS - Credit Quality (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Commercial Mortgage Loans        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     $ 119  
2019     852  
2018     1,240  
2017     1,406  
2016     2,773  
Prior     3,074  
Total $ 9,464 $ 9,390 9,464 $ 9,390
Age Analysis of Past Due Mortgage Loan        
Total Past Due     0 0
Current     9,464 9,390
Total     9,464 9,390
Non-accruing Loans     0 0
Total 9,464 9,390    
Non-accruing Loans with No allowance     0 0
Interest Income on Non-accruing Loans 0 0    
Commercial Mortgage Loans | 30-59 Days        
Age Analysis of Past Due Mortgage Loan        
Total Past Due     0 0
Commercial Mortgage Loans | 60-89 Days        
Age Analysis of Past Due Mortgage Loan        
Total Past Due     0 0
Commercial Mortgage Loans | 90 Days Or Greater        
Age Analysis of Past Due Mortgage Loan        
Total Past Due     0 0
Commercial Mortgage Loans | Greater than 2.0x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     119  
2019     373  
2018     680  
2017     583  
2016     2,242  
Prior     1,340  
Total 5,337   5,337  
Age Analysis of Past Due Mortgage Loan        
Total     5,337 5,251
Total 5,337      
Commercial Mortgage Loans | 1.8x to 2.0x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     184  
2018     48  
2017     379  
2016     40  
Prior     451  
Total 1,102   1,102  
Age Analysis of Past Due Mortgage Loan        
Total     1,102 1,331
Total 1,102      
Commercial Mortgage Loans | 1.5x to 1.8x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     242  
2018     223  
2017     332  
2016     491  
Prior     577  
Total 1,865   1,865  
Age Analysis of Past Due Mortgage Loan        
Total     1,865 1,546
Total 1,865      
Commercial Mortgage Loans | 1.2x to 1.5x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     0  
2018     207  
2017     75  
2016     0  
Prior     590  
Total 872   872  
Age Analysis of Past Due Mortgage Loan        
Total     872 974
Total 872      
Commercial Mortgage Loans | 1.0x to 1.2x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     53  
2018     82  
2017     37  
2016     0  
Prior     116  
Total 288   288  
Age Analysis of Past Due Mortgage Loan        
Total     288 288
Total 288      
Commercial Mortgage Loans | Less than 1.0x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     0  
2018     0  
2017     0  
2016     0  
Prior     0  
Total 0   0  
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total 0      
Commercial Mortgage Loans | 0% - 50%        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     0  
2018     28  
2017     324  
2016     213  
Prior     637  
Total 1,202   1,202  
Age Analysis of Past Due Mortgage Loan        
Total     1,202 1,180
Total 1,202      
Commercial Mortgage Loans | 0% - 50% | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     942 903
Commercial Mortgage Loans | 0% - 50% | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     21 38
Commercial Mortgage Loans | 0% - 50% | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     214 214
Commercial Mortgage Loans | 0% - 50% | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     25 25
Commercial Mortgage Loans | 0% - 50% | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Commercial Mortgage Loans | 0% - 50% | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Commercial Mortgage Loans | 50% - 70%        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     119  
2019     767  
2018     1,003  
2017     1,072  
2016     2,501  
Prior     2,046  
Total 7,508   7,508  
Age Analysis of Past Due Mortgage Loan        
Total     7,508 7,447
Total 7,508      
Commercial Mortgage Loans | 50% - 70% | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     4,143 4,097
Commercial Mortgage Loans | 50% - 70% | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     983 1,195
Commercial Mortgage Loans | 50% - 70% | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     1,437 1,118
Commercial Mortgage Loans | 50% - 70% | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     704 795
Commercial Mortgage Loans | 50% - 70% | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     241 242
Commercial Mortgage Loans | 50% - 70% | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Commercial Mortgage Loans | 70% - 90%        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     85  
2018     209  
2017     10  
2016     59  
Prior     391  
Total 754   754  
Age Analysis of Past Due Mortgage Loan        
Total     754 763
Total 754      
Commercial Mortgage Loans | 70% - 90% | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     252 251
Commercial Mortgage Loans | 70% - 90% | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     98 98
Commercial Mortgage Loans | 70% - 90% | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     214 214
Commercial Mortgage Loans | 70% - 90% | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     143 154
Commercial Mortgage Loans | 70% - 90% | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     47 46
Commercial Mortgage Loans | 70% - 90% | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Commercial Mortgage Loans | 90% plus        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     0  
2018     0  
2017     0  
2016     0  
Prior     0  
Total 0   0  
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total 0      
Commercial Mortgage Loans | 90% plus | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Commercial Mortgage Loans | 90% plus | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Commercial Mortgage Loans | 90% plus | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Commercial Mortgage Loans | 90% plus | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Commercial Mortgage Loans | 90% plus | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Commercial Mortgage Loans | 90% plus | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     68  
2019     301  
2018     354  
2017     297  
2016     415  
Prior     1,270  
Total 2,705 2,717 2,705 2,717
Age Analysis of Past Due Mortgage Loan        
Total Past Due     87 124
Current     2,618 2,593
Total     2,705 2,717
Non-accruing Loans     0 0
Total 2,705 2,717    
Non-accruing Loans with No allowance     0 0
Interest Income on Non-accruing Loans 0 0    
Agricultural Mortgage Loans | 30-59 Days        
Age Analysis of Past Due Mortgage Loan        
Total Past Due     7 57
Agricultural Mortgage Loans | 60-89 Days        
Age Analysis of Past Due Mortgage Loan        
Total Past Due     17 1
Agricultural Mortgage Loans | 90 Days Or Greater        
Age Analysis of Past Due Mortgage Loan        
Total Past Due     63 66
Agricultural Mortgage Loans | Greater than 2.0x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     3  
2019     38  
2018     41  
2017     37  
2016     77  
Prior     189  
Total 385   385  
Age Analysis of Past Due Mortgage Loan        
Total     385 404
Total 385      
Agricultural Mortgage Loans | 1.8x to 2.0x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     7  
2019     30  
2018     15  
2017     17  
2016     22  
Prior     102  
Total 193   193  
Age Analysis of Past Due Mortgage Loan        
Total     193 191
Total 193      
Agricultural Mortgage Loans | 1.5x to 1.8x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     26  
2019     39  
2018     47  
2017     49  
2016     62  
Prior     249  
Total 472   472  
Age Analysis of Past Due Mortgage Loan        
Total     472 477
Total 472      
Agricultural Mortgage Loans | 1.2x to 1.5x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     12  
2019     127  
2018     150  
2017     121  
2016     174  
Prior     413  
Total 997   997  
Age Analysis of Past Due Mortgage Loan        
Total     997 990
Total 997      
Agricultural Mortgage Loans | 1.0x to 1.2x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     17  
2019     57  
2018     92  
2017     72  
2016     61  
Prior     276  
Total 575   575  
Age Analysis of Past Due Mortgage Loan        
Total     575 572
Total 575      
Agricultural Mortgage Loans | Less than 1.0x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     3  
2019     10  
2018     9  
2017     1  
2016     19  
Prior     41  
Total 83   83  
Age Analysis of Past Due Mortgage Loan        
Total     83 83
Total 83      
Agricultural Mortgage Loans | 0% - 50%        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     30  
2019     136  
2018     164  
2017     171  
2016     270  
Prior     834  
Total 1,605   1,605  
Age Analysis of Past Due Mortgage Loan        
Total     1,605 1,583
Total 1,605      
Agricultural Mortgage Loans | 0% - 50% | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     304 322
Agricultural Mortgage Loans | 0% - 50% | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     110 104
Agricultural Mortgage Loans | 0% - 50% | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     252 241
Agricultural Mortgage Loans | 0% - 50% | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     558 545
Agricultural Mortgage Loans | 0% - 50% | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     333 321
Agricultural Mortgage Loans | 0% - 50% | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     48 50
Agricultural Mortgage Loans | 50% - 70%        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     38  
2019     165  
2018     187  
2017     126  
2016     145  
Prior     420  
Total 1,081   1,081  
Age Analysis of Past Due Mortgage Loan        
Total     1,081 1,115
Total 1,081      
Agricultural Mortgage Loans | 50% - 70% | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     81 82
Agricultural Mortgage Loans | 50% - 70% | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     83 87
Agricultural Mortgage Loans | 50% - 70% | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     220 236
Agricultural Mortgage Loans | 50% - 70% | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     420 426
Agricultural Mortgage Loans | 50% - 70% | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     242 251
Agricultural Mortgage Loans | 50% - 70% | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     35 33
Agricultural Mortgage Loans | 70% - 90%        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     0  
2018     3  
2017     0  
2016     0  
Prior     16  
Total 19   19  
Age Analysis of Past Due Mortgage Loan        
Total     19 19
Total 19      
Agricultural Mortgage Loans | 70% - 90% | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 70% - 90% | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 70% - 90% | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 70% - 90% | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     19 19
Agricultural Mortgage Loans | 70% - 90% | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 70% - 90% | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 90% plus        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     0  
2018     0  
2017     0  
2016     0  
Prior     0  
Total 0   0  
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total 0      
Agricultural Mortgage Loans | 90% plus | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 90% plus | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 90% plus | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 90% plus | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 90% plus | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Agricultural Mortgage Loans | 90% plus | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total Mortgages Loan        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     187  
2019     1,153  
2018     1,594  
2017     1,703  
2016     3,188  
Prior     4,344  
Total 12,169 12,107 12,169 12,107
Age Analysis of Past Due Mortgage Loan        
Total Past Due     87 124
Current     12,082 11,983
Total     12,169 12,107
Non-accruing Loans     0 0
Total 12,169 12,107    
Non-accruing Loans with No allowance     0 0
Interest Income on Non-accruing Loans 0 $ 0    
Total Mortgages Loan | 30-59 Days        
Age Analysis of Past Due Mortgage Loan        
Total Past Due     7 57
Total Mortgages Loan | 60-89 Days        
Age Analysis of Past Due Mortgage Loan        
Total Past Due     17 1
Total Mortgages Loan | 90 Days Or Greater        
Age Analysis of Past Due Mortgage Loan        
Total Past Due     63 66
Total Mortgages Loan | Greater than 2.0x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     122  
2019     411  
2018     721  
2017     620  
2016     2,319  
Prior     1,529  
Total 5,722   5,722  
Age Analysis of Past Due Mortgage Loan        
Total     5,722 5,655
Total 5,722      
Total Mortgages Loan | 1.8x to 2.0x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     7  
2019     214  
2018     63  
2017     396  
2016     62  
Prior     553  
Total 1,295   1,295  
Age Analysis of Past Due Mortgage Loan        
Total     1,295 1,522
Total 1,295      
Total Mortgages Loan | 1.5x to 1.8x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     26  
2019     281  
2018     270  
2017     381  
2016     553  
Prior     826  
Total 2,337   2,337  
Age Analysis of Past Due Mortgage Loan        
Total     2,337 2,023
Total 2,337      
Total Mortgages Loan | 1.2x to 1.5x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     12  
2019     127  
2018     357  
2017     196  
2016     174  
Prior     1,003  
Total 1,869   1,869  
Age Analysis of Past Due Mortgage Loan        
Total     1,869 1,964
Total 1,869      
Total Mortgages Loan | 1.0x to 1.2x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     17  
2019     110  
2018     174  
2017     109  
2016     61  
Prior     392  
Total 863   863  
Age Analysis of Past Due Mortgage Loan        
Total     863 860
Total 863      
Total Mortgages Loan | Less than 1.0x        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     3  
2019     10  
2018     9  
2017     1  
2016     19  
Prior     41  
Total 83   83  
Age Analysis of Past Due Mortgage Loan        
Total     83 83
Total 83      
Total Mortgages Loan | 0% - 50%        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     30  
2019     136  
2018     192  
2017     495  
2016     483  
Prior     1,471  
Total 2,807   2,807  
Age Analysis of Past Due Mortgage Loan        
Total     2,807 2,763
Total 2,807      
Total Mortgages Loan | 0% - 50% | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     1,246 1,225
Total Mortgages Loan | 0% - 50% | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     131 142
Total Mortgages Loan | 0% - 50% | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     466 455
Total Mortgages Loan | 0% - 50% | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     583 570
Total Mortgages Loan | 0% - 50% | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     333 321
Total Mortgages Loan | 0% - 50% | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     48 50
Total Mortgages Loan | 50% - 70%        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     157  
2019     932  
2018     1,190  
2017     1,198  
2016     2,646  
Prior     2,466  
Total 8,589   8,589  
Age Analysis of Past Due Mortgage Loan        
Total     8,589 8,562
Total 8,589      
Total Mortgages Loan | 50% - 70% | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     4,224 4,179
Total Mortgages Loan | 50% - 70% | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     1,066 1,282
Total Mortgages Loan | 50% - 70% | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     1,657 1,354
Total Mortgages Loan | 50% - 70% | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     1,124 1,221
Total Mortgages Loan | 50% - 70% | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     483 493
Total Mortgages Loan | 50% - 70% | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     35 33
Total Mortgages Loan | 70% - 90%        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     85  
2018     212  
2017     10  
2016     59  
Prior     407  
Total 773   773  
Age Analysis of Past Due Mortgage Loan        
Total     773 782
Total 773      
Total Mortgages Loan | 70% - 90% | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     252 251
Total Mortgages Loan | 70% - 90% | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     98 98
Total Mortgages Loan | 70% - 90% | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     214 214
Total Mortgages Loan | 70% - 90% | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     162 173
Total Mortgages Loan | 70% - 90% | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     47 46
Total Mortgages Loan | 70% - 90% | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total Mortgages Loan | 90% plus        
Financing Receivable, before Allowance for Credit Loss [Abstract]        
2020     0  
2019     0  
2018     0  
2017     0  
2016     0  
Prior     0  
Total 0   0  
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total $ 0      
Total Mortgages Loan | 90% plus | Greater than 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total Mortgages Loan | 90% plus | 1.8x to 2.0x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total Mortgages Loan | 90% plus | 1.5x to 1.8x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total Mortgages Loan | 90% plus | 1.2x to 1.5x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total Mortgages Loan | 90% plus | 1.0x to 1.2x        
Age Analysis of Past Due Mortgage Loan        
Total     0 0
Total Mortgages Loan | 90% plus | Less than 1.0x        
Age Analysis of Past Due Mortgage Loan        
Total     $ 0 $ 0