INVESTMENTS - Credit Quality (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Commercial Mortgage Loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	$ 480		$ 3,272
Fiscal year before current fiscal year	3,273		2,114
Two years before current fiscal year	2,113		1,369
Three years before current fiscal year	1,369		642
Four years before current fiscal year	640		1,201
Prior	6,220		5,043
Revolving Loans Amortized Cost Basis	296		328
Revolving Loans Converted to Term Loans Amortized Cost Basis	128		34
Total	14,519		14,003
Total	14,428		14,003
Non-accruing Loans	91		0
Non-accruing Loans with No Allowance	0		0
Interest Income on Non-accruing Loans	1	$ 0
Commercial Mortgage Loans | Past Due
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	62		56
Commercial Mortgage Loans | 30-59 Days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	62		56
Commercial Mortgage Loans | 60-89 Days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	0		0
Commercial Mortgage Loans | 90 Days or More
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	0		0
Commercial Mortgage Loans | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	14,366		13,947
Commercial Mortgage Loans | Greater than 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	0		771
Fiscal year before current fiscal year	783		1,159
Two years before current fiscal year	1,160		1,113
Three years before current fiscal year	1,113		102
Four years before current fiscal year	102		571
Prior	2,622		1,911
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	5,780		5,627
Commercial Mortgage Loans | 1.8x to 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	0		158
Fiscal year before current fiscal year	94		215
Two years before current fiscal year	180		164
Three years before current fiscal year	164		197
Four years before current fiscal year	288		186
Prior	600		477
Revolving Loans Amortized Cost Basis	242		279
Revolving Loans Converted to Term Loans Amortized Cost Basis	94		0
Total	1,662		1,676
Commercial Mortgage Loans | 1.5x to 1.8x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	0		337
Fiscal year before current fiscal year	400		390
Two years before current fiscal year	490		32
Three years before current fiscal year	32		153
Four years before current fiscal year	195		176
Prior	1,234		1,175
Revolving Loans Amortized Cost Basis	0		4
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	2,351		2,267
Commercial Mortgage Loans | 1.2x to 1.5x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	307		1,041
Fiscal year before current fiscal year	1,041		259
Two years before current fiscal year	194		0
Three years before current fiscal year	0		92
Four years before current fiscal year	0		73
Prior	854		917
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	2,396		2,382
Commercial Mortgage Loans | 1.0x to 1.2x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	166		507
Fiscal year before current fiscal year	496		43
Two years before current fiscal year	41		60
Three years before current fiscal year	60		98
Four years before current fiscal year	55		160
Prior	840		492
Revolving Loans Amortized Cost Basis	54		45
Revolving Loans Converted to Term Loans Amortized Cost Basis	34		34
Total	1,746		1,439
Commercial Mortgage Loans | Less than 1.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	7		458
Fiscal year before current fiscal year	459		48
Two years before current fiscal year	48		0
Three years before current fiscal year	0		0
Four years before current fiscal year	0		35
Prior	70		71
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	584		612
Commercial Mortgage Loans | 0% - 50%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	0		624
Fiscal year before current fiscal year	679		130
Two years before current fiscal year	130		0
Three years before current fiscal year	0		0
Four years before current fiscal year	0		119
Prior	1,449		1,242
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	2,258		2,115
Commercial Mortgage Loans | 50% - 70%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	237		2,285
Fiscal year before current fiscal year	2,230		1,569
Two years before current fiscal year	1,568		906
Three years before current fiscal year	906		313
Four years before current fiscal year	312		623
Prior	2,911		2,254
Revolving Loans Amortized Cost Basis	268		328
Revolving Loans Converted to Term Loans Amortized Cost Basis	94		0
Total	8,526		8,278
Commercial Mortgage Loans | 70% - 90%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	243		363
Fiscal year before current fiscal year	364		415
Two years before current fiscal year	382		463
Three years before current fiscal year	463		329
Four years before current fiscal year	328		424
Prior	1,635		1,314
Revolving Loans Amortized Cost Basis	28		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	34		34
Total	3,477		3,342
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	33		0
Three years before current fiscal year	0		0
Four years before current fiscal year	0		35
Prior	225		233
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	258		268
Agricultural Mortgage Loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	21		353
Fiscal year before current fiscal year	352		367
Two years before current fiscal year	364		450
Three years before current fiscal year	445		197
Four years before current fiscal year	195		215
Prior	1,195		1,008
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	2,572		2,590
Total	2,553		2,574
Non-accruing Loans	19		16
Non-accruing Loans with No Allowance	3		0
Interest Income on Non-accruing Loans	0	0
Agricultural Mortgage Loans | Past Due
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	43		21
Agricultural Mortgage Loans | 30-59 Days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	17		3
Agricultural Mortgage Loans | 60-89 Days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	11		5
Agricultural Mortgage Loans | 90 Days or More
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	15		13
Agricultural Mortgage Loans | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	2,510		2,553
Agricultural Mortgage Loans | Greater than 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	2		51
Fiscal year before current fiscal year	51		40
Two years before current fiscal year	40		62
Three years before current fiscal year	61		21
Four years before current fiscal year	21		12
Prior	189		193
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	364		379
Agricultural Mortgage Loans | 1.8x to 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	0		16
Fiscal year before current fiscal year	16		58
Two years before current fiscal year	57		35
Three years before current fiscal year	33		24
Four years before current fiscal year	24		14
Prior	67		51
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	197		198
Agricultural Mortgage Loans | 1.5x to 1.8x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	6		69
Fiscal year before current fiscal year	69		42
Two years before current fiscal year	31		111
Three years before current fiscal year	110		18
Four years before current fiscal year	18		19
Prior	213		196
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	447		455
Agricultural Mortgage Loans | 1.2x to 1.5x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	4		107
Fiscal year before current fiscal year	107		147
Two years before current fiscal year	156		177
Three years before current fiscal year	177		98
Four years before current fiscal year	97		99
Prior	391		298
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	932		926
Agricultural Mortgage Loans | 1.0x to 1.2x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	5		91
Fiscal year before current fiscal year	90		80
Two years before current fiscal year	80		61
Three years before current fiscal year	60		30
Four years before current fiscal year	29		60
Prior	310		257
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	574		579
Agricultural Mortgage Loans | Less than 1.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	4		19
Fiscal year before current fiscal year	19		0
Two years before current fiscal year	0		4
Three years before current fiscal year	4		6
Four years before current fiscal year	6		11
Prior	25		13
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	58		53
Agricultural Mortgage Loans | 0% - 50%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	10		163
Fiscal year before current fiscal year	164		182
Two years before current fiscal year	182		228
Three years before current fiscal year	237		129
Four years before current fiscal year	128		132
Prior	847		725
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	1,568		1,559
Agricultural Mortgage Loans | 50% - 70%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	11		190
Fiscal year before current fiscal year	188		185
Two years before current fiscal year	182		222
Three years before current fiscal year	208		68
Four years before current fiscal year	67		83
Prior	332		267
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	988		1,015
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		16
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	16		16
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	501		3,625
Fiscal year before current fiscal year	3,625		2,481
Two years before current fiscal year	2,477		1,819
Three years before current fiscal year	1,814		839
Four years before current fiscal year	835		1,416
Prior	7,415		6,051
Revolving Loans Amortized Cost Basis	296		328
Revolving Loans Converted to Term Loans Amortized Cost Basis	128		34
Total	17,091		16,593
Total	16,981		16,577
Non-accruing Loans	110		16
Non-accruing Loans with No Allowance	3		0
Interest Income on Non-accruing Loans	1	$ 0
Mortgages Loan | Past Due
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	105		77
Mortgages Loan | 30-59 Days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	79		59
Mortgages Loan | 60-89 Days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	11		5
Mortgages Loan | 90 Days or More
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	15		13
Mortgages Loan | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	16,876		16,500
Mortgages Loan | Greater than 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	2		822
Fiscal year before current fiscal year	834		1,199
Two years before current fiscal year	1,200		1,175
Three years before current fiscal year	1,174		123
Four years before current fiscal year	123		583
Prior	2,811		2,104
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	6,144		6,006
Mortgages Loan | 1.8x to 2.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	0		174
Fiscal year before current fiscal year	110		273
Two years before current fiscal year	237		199
Three years before current fiscal year	197		221
Four years before current fiscal year	312		200
Prior	667		528
Revolving Loans Amortized Cost Basis	242		279
Revolving Loans Converted to Term Loans Amortized Cost Basis	94		0
Total	1,859		1,874
Mortgages Loan | 1.5x to 1.8x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	6		406
Fiscal year before current fiscal year	469		432
Two years before current fiscal year	521		143
Three years before current fiscal year	142		171
Four years before current fiscal year	213		195
Prior	1,447		1,371
Revolving Loans Amortized Cost Basis	0		4
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	2,798		2,722
Mortgages Loan | 1.2x to 1.5x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	311		1,148
Fiscal year before current fiscal year	1,148		406
Two years before current fiscal year	350		177
Three years before current fiscal year	177		190
Four years before current fiscal year	97		172
Prior	1,245		1,215
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	3,328		3,308
Mortgages Loan | 1.0x to 1.2x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	171		598
Fiscal year before current fiscal year	586		123
Two years before current fiscal year	121		121
Three years before current fiscal year	120		128
Four years before current fiscal year	84		220
Prior	1,150		749
Revolving Loans Amortized Cost Basis	54		45
Revolving Loans Converted to Term Loans Amortized Cost Basis	34		34
Total	2,320		2,018
Mortgages Loan | Less than 1.0x
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	11		477
Fiscal year before current fiscal year	478		48
Two years before current fiscal year	48		4
Three years before current fiscal year	4		6
Four years before current fiscal year	6		46
Prior	95		84
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	642		665
Mortgages Loan | 0% - 50%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	10		787
Fiscal year before current fiscal year	843		312
Two years before current fiscal year	312		228
Three years before current fiscal year	237		129
Four years before current fiscal year	128		251
Prior	2,296		1,967
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	3,826		3,674
Mortgages Loan | 50% - 70%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	248		2,475
Fiscal year before current fiscal year	2,418		1,754
Two years before current fiscal year	1,750		1,128
Three years before current fiscal year	1,114		381
Four years before current fiscal year	379		706
Prior	3,243		2,521
Revolving Loans Amortized Cost Basis	268		328
Revolving Loans Converted to Term Loans Amortized Cost Basis	94		0
Total	9,514		9,293
Mortgages Loan | 70% - 90%
Financing Receivable, before Allowance for Credit Loss [Abstract]
Current fiscal year	243		363
Fiscal year before current fiscal year	364		415
Two years before current fiscal year	382		463
Three years before current fiscal year	463		329
Four years before current fiscal year	328		424
Prior	1,651		1,330
Revolving Loans Amortized Cost Basis	28		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	34		34
Total	3,493		3,358
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	33		0
Three years before current fiscal year	0		0
Four years before current fiscal year	0		35
Prior	225		233
Revolving Loans Amortized Cost Basis	0		0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0		0
Total	$ 258		$ 268