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INVESTMENTS - Credit Quality (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   $ 16,610 $ 14,095
Total   16,594 14,079
Non-accruing Loans   16 16
Non-accruing Loans with No Allowance   0 0
Interest Income on Non-accruing Loans $ 0 0  
Past Due      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   77 27
30-59 Days      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   59 1
60-89 Days      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   5 1
90 Days Or Greater      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   13 25
Current      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   16,517 14,052
Commercial Mortgage Loans      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   3,272 2,134
Fiscal year before current fiscal year   2,114 1,522
Two years before current fiscal year   1,369 751
Three years before current fiscal year   642 1,253
Four years before current fiscal year   1,201 1,065
Prior   5,060 4,587
Revolving Loans Amortized Cost Basis   328 139
Revolving Loans Converted to Term Loans Amortized Cost Basis   34 0
Total   14,020 11,451
Total   14,020 11,451
Non-accruing Loans   0 0
Non-accruing Loans with No Allowance   0 0
Interest Income on Non-accruing Loans 0 0  
Commercial Mortgage Loans | Past Due      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   56 0
Commercial Mortgage Loans | 30-59 Days      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   56 0
Commercial Mortgage Loans | 60-89 Days      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   0 0
Commercial Mortgage Loans | 90 Days Or Greater      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   0 0
Commercial Mortgage Loans | Current      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   13,964 11,451
Commercial Mortgage Loans | Greater than 2.0x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   771 1,143
Fiscal year before current fiscal year   1,159 1,243
Two years before current fiscal year   1,113 210
Three years before current fiscal year   102 772
Four years before current fiscal year   571 485
Prior   1,923 2,235
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   5,639 6,088
Commercial Mortgage Loans | 1.8x to 2.0x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   158 185
Fiscal year before current fiscal year   215 135
Two years before current fiscal year   164 182
Three years before current fiscal year   197 46
Four years before current fiscal year   186 161
Prior   482 372
Revolving Loans Amortized Cost Basis   279 68
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   1,681 1,149
Commercial Mortgage Loans | 1.5x to 1.8x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   337 275
Fiscal year before current fiscal year   390 49
Two years before current fiscal year   32 284
Three years before current fiscal year   153 211
Four years before current fiscal year   176 166
Prior   1,175 919
Revolving Loans Amortized Cost Basis   4 48
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   2,267 1,952
Commercial Mortgage Loans | 1.2x to 1.5x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   1,041 264
Fiscal year before current fiscal year   259 95
Two years before current fiscal year   0 75
Three years before current fiscal year   92 101
Four years before current fiscal year   73 253
Prior   917 701
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   2,382 1,489
Commercial Mortgage Loans | 1.0x to 1.2x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   507 267
Fiscal year before current fiscal year   43 0
Two years before current fiscal year   60 0
Three years before current fiscal year   98 88
Four years before current fiscal year   160 0
Prior   492 287
Revolving Loans Amortized Cost Basis   45 23
Revolving Loans Converted to Term Loans Amortized Cost Basis   34 0
Total   1,439 665
Commercial Mortgage Loans | Less than 1.0x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   458 0
Fiscal year before current fiscal year   48 0
Two years before current fiscal year   0 0
Three years before current fiscal year   0 35
Four years before current fiscal year   35 0
Prior   71 73
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   612 108
Commercial Mortgage Loans | 0% - 50%      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   624 0
Fiscal year before current fiscal year   130 0
Two years before current fiscal year   0 0
Three years before current fiscal year   0 184
Four years before current fiscal year   119 293
Prior   1,259 1,009
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   2,132 1,486
Commercial Mortgage Loans | 50% - 70%      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   2,285 1,944
Fiscal year before current fiscal year   1,569 1,286
Two years before current fiscal year   906 339
Three years before current fiscal year   313 619
Four years before current fiscal year   623 491
Prior   2,254 2,533
Revolving Loans Amortized Cost Basis   328 139
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   8,278 7,351
Commercial Mortgage Loans | 70% - 90%      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   363 190
Fiscal year before current fiscal year   415 236
Two years before current fiscal year   463 412
Three years before current fiscal year   329 415
Four years before current fiscal year   424 276
Prior   1,314 972
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   34 0
Total   3,342 2,501
Commercial Mortgage Loans | 90% plus      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   0 0
Fiscal year before current fiscal year   0 0
Two years before current fiscal year   0 0
Three years before current fiscal year   0 35
Four years before current fiscal year   35 5
Prior   233 73
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   268 113
Agricultural Mortgage Loans      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   353 380
Fiscal year before current fiscal year   367 480
Two years before current fiscal year   450 230
Three years before current fiscal year   197 255
Four years before current fiscal year   215 206
Prior   1,008 1,093
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   2,590 2,644
Total   2,574 2,628
Non-accruing Loans   16 16
Non-accruing Loans with No Allowance   0 0
Interest Income on Non-accruing Loans $ 0 0  
Agricultural Mortgage Loans | Past Due      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   21 27
Agricultural Mortgage Loans | 30-59 Days      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   3 1
Agricultural Mortgage Loans | 60-89 Days      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   5 1
Agricultural Mortgage Loans | 90 Days Or Greater      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   13 25
Agricultural Mortgage Loans | Current      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Total   2,553 2,601
Agricultural Mortgage Loans | Greater than 2.0x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   51 49
Fiscal year before current fiscal year   40 64
Two years before current fiscal year   62 25
Three years before current fiscal year   21 22
Four years before current fiscal year   12 24
Prior   193 210
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   379 394
Agricultural Mortgage Loans | 1.8x to 2.0x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   16 52
Fiscal year before current fiscal year   58 37
Two years before current fiscal year   35 25
Three years before current fiscal year   24 14
Four years before current fiscal year   14 14
Prior   51 70
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   198 212
Agricultural Mortgage Loans | 1.5x to 1.8x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   69 43
Fiscal year before current fiscal year   42 113
Two years before current fiscal year   111 28
Three years before current fiscal year   18 22
Four years before current fiscal year   19 41
Prior   196 193
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   455 440
Agricultural Mortgage Loans | 1.2x to 1.5x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   107 161
Fiscal year before current fiscal year   147 179
Two years before current fiscal year   177 112
Three years before current fiscal year   98 116
Four years before current fiscal year   99 72
Prior   298 355
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   926 995
Agricultural Mortgage Loans | 1.0x to 1.2x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   91 75
Fiscal year before current fiscal year   80 83
Two years before current fiscal year   61 31
Three years before current fiscal year   30 77
Four years before current fiscal year   60 54
Prior   257 226
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   579 546
Agricultural Mortgage Loans | Less than 1.0x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   19 0
Fiscal year before current fiscal year   0 4
Two years before current fiscal year   4 9
Three years before current fiscal year   6 4
Four years before current fiscal year   11 1
Prior   13 39
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   53 57
Agricultural Mortgage Loans | 0% - 50%      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   163 180
Fiscal year before current fiscal year   182 212
Two years before current fiscal year   228 128
Three years before current fiscal year   129 129
Four years before current fiscal year   132 119
Prior   725 738
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   1,559 1,506
Agricultural Mortgage Loans | 50% - 70%      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   190 200
Fiscal year before current fiscal year   185 268
Two years before current fiscal year   222 102
Three years before current fiscal year   68 126
Four years before current fiscal year   83 87
Prior   267 338
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   1,015 1,121
Agricultural Mortgage Loans | 70% - 90%      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   0 0
Fiscal year before current fiscal year   0 0
Two years before current fiscal year   0 0
Three years before current fiscal year   0 0
Four years before current fiscal year   0 0
Prior   16 17
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   16 17
Agricultural Mortgage Loans | 90% plus      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   0 0
Fiscal year before current fiscal year   0 0
Two years before current fiscal year   0 0
Three years before current fiscal year   0 0
Four years before current fiscal year   0 0
Prior   0 0
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   0 0
Mortgages Loan      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   3,625 2,514
Fiscal year before current fiscal year   2,481 2,002
Two years before current fiscal year   1,819 981
Three years before current fiscal year   839 1,508
Four years before current fiscal year   1,416 1,271
Prior   6,068 5,680
Revolving Loans Amortized Cost Basis   328 139
Revolving Loans Converted to Term Loans Amortized Cost Basis   34 0
Total   16,610 14,095
Mortgages Loan | Greater than 2.0x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   822 1,192
Fiscal year before current fiscal year   1,199 1,307
Two years before current fiscal year   1,175 235
Three years before current fiscal year   123 794
Four years before current fiscal year   583 509
Prior   2,116 2,445
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   6,018 6,482
Mortgages Loan | 1.8x to 2.0x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   174 237
Fiscal year before current fiscal year   273 172
Two years before current fiscal year   199 207
Three years before current fiscal year   221 60
Four years before current fiscal year   200 175
Prior   533 442
Revolving Loans Amortized Cost Basis   279 68
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   1,879 1,361
Mortgages Loan | 1.5x to 1.8x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   406 318
Fiscal year before current fiscal year   432 162
Two years before current fiscal year   143 312
Three years before current fiscal year   171 233
Four years before current fiscal year   195 207
Prior   1,371 1,112
Revolving Loans Amortized Cost Basis   4 48
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   2,722 2,392
Mortgages Loan | 1.2x to 1.5x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   1,148 425
Fiscal year before current fiscal year   406 274
Two years before current fiscal year   177 187
Three years before current fiscal year   190 217
Four years before current fiscal year   172 325
Prior   1,215 1,056
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   3,308 2,484
Mortgages Loan | 1.0x to 1.2x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   598 342
Fiscal year before current fiscal year   123 83
Two years before current fiscal year   121 31
Three years before current fiscal year   128 165
Four years before current fiscal year   220 54
Prior   749 513
Revolving Loans Amortized Cost Basis   45 23
Revolving Loans Converted to Term Loans Amortized Cost Basis   34 0
Total   2,018 1,211
Mortgages Loan | Less than 1.0x      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   477 0
Fiscal year before current fiscal year   48 4
Two years before current fiscal year   4 9
Three years before current fiscal year   6 39
Four years before current fiscal year   46 1
Prior   84 112
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   665 165
Mortgages Loan | 0% - 50%      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   787 180
Fiscal year before current fiscal year   312 212
Two years before current fiscal year   228 128
Three years before current fiscal year   129 313
Four years before current fiscal year   251 412
Prior   1,984 1,747
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   3,691 2,992
Mortgages Loan | 50% - 70%      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   2,475 2,144
Fiscal year before current fiscal year   1,754 1,554
Two years before current fiscal year   1,128 441
Three years before current fiscal year   381 745
Four years before current fiscal year   706 578
Prior   2,521 2,871
Revolving Loans Amortized Cost Basis   328 139
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   9,293 8,472
Mortgages Loan | 70% - 90%      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   363 190
Fiscal year before current fiscal year   415 236
Two years before current fiscal year   463 412
Three years before current fiscal year   329 415
Four years before current fiscal year   424 276
Prior   1,330 989
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   34 0
Total   3,358 2,518
Mortgages Loan | 90% plus      
Financing Receivable, before Allowance for Credit Loss [Abstract]      
Current fiscal year   0 0
Fiscal year before current fiscal year   0 0
Two years before current fiscal year   0 0
Three years before current fiscal year   0 35
Four years before current fiscal year   35 5
Prior   233 73
Revolving Loans Amortized Cost Basis   0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis   0 0
Total   $ 268 $ 113