INVESTMENTS - Credit Quality (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	$ 18,450	$ 16,610
Total	18,197	16,594
Non-accruing Loans	253	16
Non-accruing Loans with No Allowance	0	0
Interest Income on Non-accruing Loans	7	0
Past Due
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	84	77
30-59 Days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	39	59
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	40	13
Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	18,113	16,517
Commercial
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	1,481	3,272
Fiscal year before current fiscal year	3,277	2,114
Two years before current fiscal year	2,102	1,369
Three years before current fiscal year	1,362	642
Four years before current fiscal year	636	1,201
Prior	6,118	5,060
Revolving Loans Amortized Cost Basis	500	328
Revolving Loans Converted to Term Loans Amortized Cost Basis	131	34
Total	15,607	14,020
Total	15,373	14,020
Non-accruing Loans	234	0
Non-accruing Loans with No Allowance	0	0
Interest Income on Non-accruing Loans	7	0
Commercial \| Past Due
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	32	56
Commercial \| 30-59 Days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	32	56
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	15,341	13,964
Commercial \| Greater than 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	175	771
Fiscal year before current fiscal year	693	1,159
Two years before current fiscal year	1,125	1,113
Three years before current fiscal year	1,135	102
Four years before current fiscal year	249	571
Prior	3,273	1,923
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	6,650	5,639
Commercial \| 1.8x to 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	0	158
Fiscal year before current fiscal year	0	215
Two years before current fiscal year	182	164
Three years before current fiscal year	167	197
Four years before current fiscal year	171	186
Prior	662	482
Revolving Loans Amortized Cost Basis	383	279
Revolving Loans Converted to Term Loans Amortized Cost Basis	96	0
Total	1,661	1,681
Commercial \| 1.5x to 1.8x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	80	337
Fiscal year before current fiscal year	1,060	390
Two years before current fiscal year	234	32
Three years before current fiscal year	0	153
Four years before current fiscal year	162	176
Prior	924	1,175
Revolving Loans Amortized Cost Basis	0	4
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2,460	2,267
Commercial \| 1.2x to 1.5x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	690	1,041
Fiscal year before current fiscal year	687	259
Two years before current fiscal year	457	0
Three years before current fiscal year	0	92
Four years before current fiscal year	11	73
Prior	838	917
Revolving Loans Amortized Cost Basis	41	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2,724	2,382
Commercial \| 1.0x to 1.2x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	528	507
Fiscal year before current fiscal year	668	43
Two years before current fiscal year	38	60
Three years before current fiscal year	0	98
Four years before current fiscal year	43	160
Prior	317	492
Revolving Loans Amortized Cost Basis	76	45
Revolving Loans Converted to Term Loans Amortized Cost Basis	35	34
Total	1,705	1,439
Commercial \| Less than 1.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	8	458
Fiscal year before current fiscal year	169	48
Two years before current fiscal year	66	0
Three years before current fiscal year	60	0
Four years before current fiscal year	0	35
Prior	104	71
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	407	612
Commercial \| 0% - 50%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	249	624
Fiscal year before current fiscal year	164	130
Two years before current fiscal year	129	0
Three years before current fiscal year	35	0
Four years before current fiscal year	0	119
Prior	1,557	1,259
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2,134	2,132
Commercial \| 50% - 70%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	924	2,285
Fiscal year before current fiscal year	1,916	1,569
Two years before current fiscal year	671	906
Three years before current fiscal year	750	313
Four years before current fiscal year	299	623
Prior	2,319	2,254
Revolving Loans Amortized Cost Basis	463	328
Revolving Loans Converted to Term Loans Amortized Cost Basis	96	0
Total	7,438	8,278
Commercial \| 70% - 90%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	308	363
Fiscal year before current fiscal year	1,197	415
Two years before current fiscal year	1,236	463
Three years before current fiscal year	523	329
Four years before current fiscal year	245	424
Prior	1,384	1,314
Revolving Loans Amortized Cost Basis	37	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	35	34
Total	4,965	3,342
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	66	0
Three years before current fiscal year	54	0
Four years before current fiscal year	92	35
Prior	858	233
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	1,070	268
Agricultural
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	162	353
Fiscal year before current fiscal year	308	367
Two years before current fiscal year	343	450
Three years before current fiscal year	436	197
Four years before current fiscal year	190	215
Prior	1,106	1,008
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2,545	2,590
Total	2,526	2,574
Non-accruing Loans	19	16
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	52	21
Agricultural \| 30-59 Days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	7	3
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	40	13
Agricultural \| Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	2,474	2,553
Agricultural \| Greater than 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	7	51
Fiscal year before current fiscal year	50	40
Two years before current fiscal year	36	62
Three years before current fiscal year	59	21
Four years before current fiscal year	20	12
Prior	179	193
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	351	379
Agricultural \| 1.8x to 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	18	16
Fiscal year before current fiscal year	16	58
Two years before current fiscal year	56	35
Three years before current fiscal year	33	24
Four years before current fiscal year	23	14
Prior	61	51
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	207	198
Agricultural \| 1.5x to 1.8x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	12	69
Fiscal year before current fiscal year	50	42
Two years before current fiscal year	31	111
Three years before current fiscal year	109	18
Four years before current fiscal year	17	19
Prior	193	196
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	412	455
Agricultural \| 1.2x to 1.5x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	46	107
Fiscal year before current fiscal year	111	147
Two years before current fiscal year	148	177
Three years before current fiscal year	170	98
Four years before current fiscal year	98	99
Prior	365	298
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	938	926
Agricultural \| 1.0x to 1.2x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	47	91
Fiscal year before current fiscal year	57	80
Two years before current fiscal year	68	61
Three years before current fiscal year	57	30
Four years before current fiscal year	26	60
Prior	284	257
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	539	579
Agricultural \| Less than 1.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	32	19
Fiscal year before current fiscal year	24	0
Two years before current fiscal year	4	4
Three years before current fiscal year	8	6
Four years before current fiscal year	6	11
Prior	24	13
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	98	53
Agricultural \| 0% - 50%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	102	163
Fiscal year before current fiscal year	162	182
Two years before current fiscal year	191	228
Three years before current fiscal year	235	129
Four years before current fiscal year	132	132
Prior	802	725
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	1,624	1,559
Agricultural \| 50% - 70%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	60	190
Fiscal year before current fiscal year	146	185
Two years before current fiscal year	152	222
Three years before current fiscal year	201	68
Four years before current fiscal year	58	83
Prior	288	267
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	905	1,015
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
Total commercial and agricultural mortgage loans:
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	1,643	3,625
Fiscal year before current fiscal year	3,585	2,481
Two years before current fiscal year	2,445	1,819
Three years before current fiscal year	1,798	839
Four years before current fiscal year	826	1,416
Prior	7,224	6,068
Revolving Loans Amortized Cost Basis	500	328
Revolving Loans Converted to Term Loans Amortized Cost Basis	131	34
Total	18,152	16,610
Total commercial and agricultural mortgage loans: \| Greater than 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	182	822
Fiscal year before current fiscal year	743	1,199
Two years before current fiscal year	1,161	1,175
Three years before current fiscal year	1,194	123
Four years before current fiscal year	269	583
Prior	3,452	2,116
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	7,001	6,018
Total commercial and agricultural mortgage loans: \| 1.8x to 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	18	174
Fiscal year before current fiscal year	16	273
Two years before current fiscal year	238	199
Three years before current fiscal year	200	221
Four years before current fiscal year	194	200
Prior	723	533
Revolving Loans Amortized Cost Basis	383	279
Revolving Loans Converted to Term Loans Amortized Cost Basis	96	0
Total	1,868	1,879
Total commercial and agricultural mortgage loans: \| 1.5x to 1.8x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	92	406
Fiscal year before current fiscal year	1,110	432
Two years before current fiscal year	265	143
Three years before current fiscal year	109	171
Four years before current fiscal year	179	195
Prior	1,117	1,371
Revolving Loans Amortized Cost Basis	0	4
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2,872	2,722
Total commercial and agricultural mortgage loans: \| 1.2x to 1.5x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	736	1,148
Fiscal year before current fiscal year	798	406
Two years before current fiscal year	605	177
Three years before current fiscal year	170	190
Four years before current fiscal year	109	172
Prior	1,203	1,215
Revolving Loans Amortized Cost Basis	41	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,662	3,308
Total commercial and agricultural mortgage loans: \| 1.0x to 1.2x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	575	598
Fiscal year before current fiscal year	725	123
Two years before current fiscal year	106	121
Three years before current fiscal year	57	128
Four years before current fiscal year	69	220
Prior	601	749
Revolving Loans Amortized Cost Basis	76	45
Revolving Loans Converted to Term Loans Amortized Cost Basis	35	34
Total	2,244	2,018
Total commercial and agricultural mortgage loans: \| Less than 1.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	40	477
Fiscal year before current fiscal year	193	48
Two years before current fiscal year	70	4
Three years before current fiscal year	68	6
Four years before current fiscal year	6	46
Prior	128	84
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	505	665
Total commercial and agricultural mortgage loans: \| 0% - 50%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	351	787
Fiscal year before current fiscal year	326	312
Two years before current fiscal year	320	228
Three years before current fiscal year	270	129
Four years before current fiscal year	132	251
Prior	2,359	1,984
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,758	3,691
Total commercial and agricultural mortgage loans: \| 50% - 70%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	984	2,475
Fiscal year before current fiscal year	2,062	1,754
Two years before current fiscal year	823	1,128
Three years before current fiscal year	951	381
Four years before current fiscal year	357	706
Prior	2,607	2,521
Revolving Loans Amortized Cost Basis	463	328
Revolving Loans Converted to Term Loans Amortized Cost Basis	96	0
Total	8,343	9,293
Total commercial and agricultural mortgage loans: \| 70% - 90%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	308	363
Fiscal year before current fiscal year	1,197	415
Two years before current fiscal year	1,236	463
Three years before current fiscal year	523	329
Four years before current fiscal year	245	424
Prior	1,400	1,330
Revolving Loans Amortized Cost Basis	37	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	35	34
Total	4,981	3,358
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	66	0
Three years before current fiscal year	54	0
Four years before current fiscal year	92	35
Prior	858	233
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	1,070	268
Residential mortgages:
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	98
Fiscal year before current fiscal year	121
Two years before current fiscal year	74
Three years before current fiscal year	2
Four years before current fiscal year	1
Prior	2
Total	298	0
Total	298	0
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	$ 298	$ 0

INVESTMENTS - Credit Quality (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Financing Receivable, before Allowance for Credit Loss [Abstract]

Total

$ 18,450

$ 16,610

Total

18,197

16,594

Non-accruing Loans