INVESTMENTS - Fixed Maturities Available-for-sale (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than Twelve Months, Fair Value	$ 41,257	$ 17,425
Less than 12 Months, Gross Unrealized Losses	2,522	223
12 Months or Longer, Fair Value	3,432	1,975
12 Months or Longer, Gross Unrealized Losses	341	91
Total Fair Value	44,689	19,400
Total Gross Unrealized Losses	2,863	314
Corporate Debt Securities [Member]
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than Twelve Months, Fair Value	28,350	10,571
Less than 12 Months, Gross Unrealized Losses	2,094	163
12 Months or Longer, Fair Value	2,863	1,633
12 Months or Longer, Gross Unrealized Losses	292	75
Total Fair Value	31,213	12,204
Total Gross Unrealized Losses	2,386	238
U.S. government, agencies and authorities
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than Twelve Months, Fair Value	2,884	993
Less than 12 Months, Gross Unrealized Losses	82	11
12 Months or Longer, Fair Value	94	105
12 Months or Longer, Gross Unrealized Losses	9	4
Total Fair Value	2,978	1,098
Total Gross Unrealized Losses	91	15
States and political subdivisions
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than Twelve Months, Fair Value	257	120
Less than 12 Months, Gross Unrealized Losses	28	2
12 Months or Longer, Fair Value	12	11
12 Months or Longer, Gross Unrealized Losses	3	0
Total Fair Value	269	131
Total Gross Unrealized Losses	31	2
Foreign governments
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than Twelve Months, Fair Value	606	349
Less than 12 Months, Gross Unrealized Losses	39	6
12 Months or Longer, Fair Value	120	92
12 Months or Longer, Gross Unrealized Losses	15	8
Total Fair Value	726	441
Total Gross Unrealized Losses	54	14
Asset-backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than Twelve Months, Fair Value	6,300	3,865
Less than 12 Months, Gross Unrealized Losses	110	20
12 Months or Longer, Fair Value	178	38
12 Months or Longer, Gross Unrealized Losses	3	0
Total Fair Value	6,478	3,903
Total Gross Unrealized Losses	113	20
Commercial mortgage-backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less than Twelve Months, Fair Value	2,860	1,527
Less than 12 Months, Gross Unrealized Losses	169	21
12 Months or Longer, Fair Value	165	96
12 Months or Longer, Gross Unrealized Losses	19	4
Total Fair Value	3,025	1,623
Total Gross Unrealized Losses	$ 188	$ 25