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INVESTMENTS - Credit Quality (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total $ 18,867 $ 18,450
Total 18,614 18,197
Non-accruing Loans 253 253
Non-accruing Loans with No Allowance 0 0
Interest Income on Non-accruing Loans 0 7
Past Due    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 60 84
30-59 Days    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 1 39
60-89 Days    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 5 5
90 Days or More    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 54 40
Current    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 18,554 18,113
Commercial    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 195 1,481
Fiscal year before current fiscal year 1,468 3,277
Two years before current fiscal year 3,223 2,102
Three years before current fiscal year 2,101 1,362
Four years before current fiscal year 1,360 636
Prior 6,660 6,118
Revolving Loans Amortized Cost Basis 579 500
Revolving Loans Converted to Term Loans Amortized Cost Basis 132 131
Total 15,718 15,607
Total 15,484 15,373
Non-accruing Loans 234 234
Non-accruing Loans with No Allowance 0 0
Interest Income on Non-accruing Loans 0 7
Commercial | Past Due    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 0 32
Commercial | 30-59 Days    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 0 32
Commercial | 60-89 Days    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 0 0
Commercial | 90 Days or More    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 0 0
Commercial | Current    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 15,484 15,341
Commercial | Greater than 2.0x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 0 175
Fiscal year before current fiscal year 175 693
Two years before current fiscal year 693 1,125
Three years before current fiscal year 1,190 1,135
Four years before current fiscal year 1,133 249
Prior 3,573 3,273
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 6,764 6,650
Commercial | 1.8x to 2.0x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 40 0
Fiscal year before current fiscal year 75 0
Two years before current fiscal year 0 182
Three years before current fiscal year 208 167
Four years before current fiscal year 167 171
Prior 637 662
Revolving Loans Amortized Cost Basis 318 383
Revolving Loans Converted to Term Loans Amortized Cost Basis 96 96
Total 1,541 1,661
Commercial | 1.5x to 1.8x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 0 80
Fiscal year before current fiscal year 164 1,060
Two years before current fiscal year 911 234
Three years before current fiscal year 143 0
Four years before current fiscal year 0 162
Prior 1,016 924
Revolving Loans Amortized Cost Basis 100 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 2,334 2,460
Commercial | 1.2x to 1.5x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 82 690
Fiscal year before current fiscal year 612 687
Two years before current fiscal year 981 457
Three years before current fiscal year 427 0
Four years before current fiscal year 0 11
Prior 912 838
Revolving Loans Amortized Cost Basis 79 41
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 3,093 2,724
Commercial | 1.0x to 1.2x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 73 528
Fiscal year before current fiscal year 434 668
Two years before current fiscal year 281 38
Three years before current fiscal year 67 0
Four years before current fiscal year 0 43
Prior 464 317
Revolving Loans Amortized Cost Basis 82 76
Revolving Loans Converted to Term Loans Amortized Cost Basis 36 35
Total 1,437 1,705
Commercial | Less than 1.0x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 0 8
Fiscal year before current fiscal year 8 169
Two years before current fiscal year 357 66
Three years before current fiscal year 66 60
Four years before current fiscal year 60 0
Prior 58 104
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 549 407
Commercial | 0% - 50%    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 0 249
Fiscal year before current fiscal year 308 164
Two years before current fiscal year 155 129
Three years before current fiscal year 129 35
Four years before current fiscal year 35 0
Prior 1,532 1,557
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 2,159 2,134
Commercial | 50% - 70%    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 195 924
Fiscal year before current fiscal year 920 1,916
Two years before current fiscal year 1,871 671
Three years before current fiscal year 670 750
Four years before current fiscal year 749 299
Prior 2,522 2,319
Revolving Loans Amortized Cost Basis 517 463
Revolving Loans Converted to Term Loans Amortized Cost Basis 96 96
Total 7,540 7,438
Commercial | 70% - 90%    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 0 308
Fiscal year before current fiscal year 240 1,197
Two years before current fiscal year 1,197 1,236
Three years before current fiscal year 1,144 523
Four years before current fiscal year 576 245
Prior 1,657 1,384
Revolving Loans Amortized Cost Basis 62 37
Revolving Loans Converted to Term Loans Amortized Cost Basis 36 35
Total 4,912 4,965
Commercial | 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 66
Three years before current fiscal year 158 54
Four years before current fiscal year 0 92
Prior 949 858
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 1,107 1,070
Agricultural    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 54 162
Fiscal year before current fiscal year 162 308
Two years before current fiscal year 304 343
Three years before current fiscal year 340 436
Four years before current fiscal year 422 190
Prior 1,260 1,106
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 2,542 2,545
Total 2,523 2,526
Non-accruing Loans 19 19
Non-accruing Loans with No Allowance 0 0
Interest Income on Non-accruing Loans 0 0
Agricultural | Past Due    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 60 52
Agricultural | 30-59 Days    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 1 7
Agricultural | 60-89 Days    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 5 5
Agricultural | 90 Days or More    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 54 40
Agricultural | Current    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 2,463 2,474
Agricultural | Greater than 2.0x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 8 7
Fiscal year before current fiscal year 7 50
Two years before current fiscal year 50 36
Three years before current fiscal year 34 59
Four years before current fiscal year 59 20
Prior 196 179
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 354 351
Agricultural | 1.8x to 2.0x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 5 18
Fiscal year before current fiscal year 18 16
Two years before current fiscal year 16 56
Three years before current fiscal year 56 33
Four years before current fiscal year 29 23
Prior 83 61
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 207 207
Agricultural | 1.5x to 1.8x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 2 12
Fiscal year before current fiscal year 12 50
Two years before current fiscal year 49 31
Three years before current fiscal year 31 109
Four years before current fiscal year 110 17
Prior 209 193
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 413 412
Agricultural | 1.2x to 1.5x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 35 46
Fiscal year before current fiscal year 46 111
Two years before current fiscal year 110 148
Three years before current fiscal year 148 170
Four years before current fiscal year 159 98
Prior 433 365
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 931 938
Agricultural | 1.0x to 1.2x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 3 47
Fiscal year before current fiscal year 47 57
Two years before current fiscal year 55 68
Three years before current fiscal year 67 57
Four years before current fiscal year 57 26
Prior 307 284
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 536 539
Agricultural | Less than 1.0x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 1 32
Fiscal year before current fiscal year 32 24
Two years before current fiscal year 24 4
Three years before current fiscal year 4 8
Four years before current fiscal year 8 6
Prior 32 24
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 101 98
Agricultural | 0% - 50%    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 14 102
Fiscal year before current fiscal year 102 162
Two years before current fiscal year 160 191
Three years before current fiscal year 190 235
Four years before current fiscal year 242 132
Prior 910 802
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 1,618 1,624
Agricultural | 50% - 70%    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 40 60
Fiscal year before current fiscal year 60 146
Two years before current fiscal year 144 152
Three years before current fiscal year 150 201
Four years before current fiscal year 180 58
Prior 334 288
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 908 905
Agricultural | 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 16
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 16 16
Agricultural | 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
Residential mortgages:    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 0 98
Fiscal year before current fiscal year 373 121
Two years before current fiscal year 139 74
Three years before current fiscal year 90 2
Four years before current fiscal year 3 1
Prior 2 2
Total 607 298
Total 607 298
Non-accruing Loans 0 0
Non-accruing Loans with No Allowance 0 0
Interest Income on Non-accruing Loans 0 0
Residential mortgages: | Past Due    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 0 0
Residential mortgages: | 30-59 Days    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 0 0
Residential mortgages: | 60-89 Days    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 0 0
Residential mortgages: | 90 Days or More    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 0 0
Residential mortgages: | Current    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Total 607 298
Total commercial and agricultural mortgage loans:    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 249 1,643
Fiscal year before current fiscal year 1,630 3,585
Two years before current fiscal year 3,527 2,445
Three years before current fiscal year 2,441 1,798
Four years before current fiscal year 1,782 826
Prior 7,920 7,224
Revolving Loans Amortized Cost Basis 579 500
Revolving Loans Converted to Term Loans Amortized Cost Basis 132 131
Total 18,260 18,152
Total commercial and agricultural mortgage loans: | Greater than 2.0x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 8 182
Fiscal year before current fiscal year 182 743
Two years before current fiscal year 743 1,161
Three years before current fiscal year 1,224 1,194
Four years before current fiscal year 1,192 269
Prior 3,769 3,452
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 7,118 7,001
Total commercial and agricultural mortgage loans: | 1.8x to 2.0x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 45 18
Fiscal year before current fiscal year 93 16
Two years before current fiscal year 16 238
Three years before current fiscal year 264 200
Four years before current fiscal year 196 194
Prior 720 723
Revolving Loans Amortized Cost Basis 318 383
Revolving Loans Converted to Term Loans Amortized Cost Basis 96 96
Total 1,748 1,868
Total commercial and agricultural mortgage loans: | 1.5x to 1.8x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 2 92
Fiscal year before current fiscal year 176 1,110
Two years before current fiscal year 960 265
Three years before current fiscal year 174 109
Four years before current fiscal year 110 179
Prior 1,225 1,117
Revolving Loans Amortized Cost Basis 100 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 2,747 2,872
Total commercial and agricultural mortgage loans: | 1.2x to 1.5x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 117 736
Fiscal year before current fiscal year 658 798
Two years before current fiscal year 1,091 605
Three years before current fiscal year 575 170
Four years before current fiscal year 159 109
Prior 1,345 1,203
Revolving Loans Amortized Cost Basis 79 41
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 4,024 3,662
Total commercial and agricultural mortgage loans: | 1.0x to 1.2x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 76 575
Fiscal year before current fiscal year 481 725
Two years before current fiscal year 336 106
Three years before current fiscal year 134 57
Four years before current fiscal year 57 69
Prior 771 601
Revolving Loans Amortized Cost Basis 82 76
Revolving Loans Converted to Term Loans Amortized Cost Basis 36 35
Total 1,973 2,244
Total commercial and agricultural mortgage loans: | Less than 1.0x    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 1 40
Fiscal year before current fiscal year 40 193
Two years before current fiscal year 381 70
Three years before current fiscal year 70 68
Four years before current fiscal year 68 6
Prior 90 128
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 650 505
Total commercial and agricultural mortgage loans: | 0% - 50%    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 14 351
Fiscal year before current fiscal year 410 326
Two years before current fiscal year 315 320
Three years before current fiscal year 319 270
Four years before current fiscal year 277 132
Prior 2,442 2,359
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 3,777 3,758
Total commercial and agricultural mortgage loans: | 50% - 70%    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 235 984
Fiscal year before current fiscal year 980 2,062
Two years before current fiscal year 2,015 823
Three years before current fiscal year 820 951
Four years before current fiscal year 929 357
Prior 2,856 2,607
Revolving Loans Amortized Cost Basis 517 463
Revolving Loans Converted to Term Loans Amortized Cost Basis 96 96
Total 8,448 8,343
Total commercial and agricultural mortgage loans: | 70% - 90%    
Financing Receivable, before Allowance for Credit Loss [Abstract]    
Current fiscal year 0 308
Fiscal year before current fiscal year 240 1,197
Two years before current fiscal year 1,197 1,236
Three years before current fiscal year 1,144 523
Four years before current fiscal year 576 245
Prior 1,673 1,400
Revolving Loans Amortized Cost Basis 62 37
Revolving Loans Converted to Term Loans Amortized Cost Basis 36 35
Total 4,928 4,981
Total commercial and 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 66
Three years before current fiscal year 158 54
Four years before current fiscal year 0 92
Prior 949 858
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total $ 1,107 $ 1,070