FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets:
Fixed maturity securities - AFS	$ 67,710	$ 70,119
Fixed maturity securities - trading	2,833	2,958
Total fixed maturity securities	69,859	72,595
Equity securities	741	667
Other long-term investments	1,624	1,636
Short-term investments	661	462
Assets related to separate accounts
Variable annuity	12,699	12,378
Variable universal life	1,646	1,287
Fixed maturities
Assets:
Fixed maturity securities - AFS	67,158	69,733
Fixed maturity securities - trading	2,701	2,862
Residential mortgage-backed securities
Assets:
Fixed maturity securities - AFS	6,903	6,668
Fixed maturity securities - trading	181	209
Commercial mortgage-backed securities
Assets:
Fixed maturity securities - AFS	2,425	2,534
Fixed maturity securities - trading	213	214
Other asset-backed securities
Assets:
Fixed maturity securities - AFS	1,536	1,578
Fixed maturity securities - trading	175	163
States, municipals, and political subdivisions
Assets:
Fixed maturity securities - AFS	4,119	4,420
Fixed maturity securities - trading	282	282
Other government-related securities
Assets:
Fixed maturity securities - AFS	642	717
Fixed maturity securities - trading	32	30
Corporate securities
Assets:
Fixed maturity securities - AFS	50,357	52,107
Fixed maturity securities - trading	1,772	1,860
Level 3 \| Commercial mortgage-backed securities
Assets:
Total investments	32	32
Level 3 \| Other asset-backed securities
Assets:
Total investments	440	435
Level 3 \| Corporate securities
Assets:
Total investments	1,406	1,432
Measured at fair value on a recurring basis
Assets:
Total fixed maturity securities	69,859	72,595
Equity securities	741	667
Other long-term investments	1,624	1,636
Short-term investments	661	462
Total investments	72,885	75,360
Cash	565	656
Assets related to separate accounts
Variable annuity	12,699	12,378
Variable universal life	1,646	1,287
Total assets measured at fair value on a recurring basis	87,795	89,681
Liabilities:
Annuity account balances	66	67
Other liabilities	2,651	3,119
Total liabilities measured at fair value on a recurring basis	2,717	3,186
Measured at fair value on a recurring basis \| Fixed maturities
Assets:
Fixed maturity securities - AFS	67,158	69,733
Fixed maturity securities - trading	2,701	2,862
Measured at fair value on a recurring basis \| Residential mortgage-backed securities
Assets:
Fixed maturity securities - AFS	6,903	6,668
Fixed maturity securities - trading	181	209
Measured at fair value on a recurring basis \| Commercial mortgage-backed securities
Assets:
Fixed maturity securities - AFS	2,425	2,534
Fixed maturity securities - trading	213	214
Measured at fair value on a recurring basis \| Other asset-backed securities
Assets:
Fixed maturity securities - AFS	1,536	1,578
Fixed maturity securities - trading	175	163
Measured at fair value on a recurring basis \| U.S. government-related securities
Assets:
Fixed maturity securities - AFS	960	1,515
Fixed maturity securities - trading	35	91
Measured at fair value on a recurring basis \| States, municipals, and political subdivisions
Assets:
Fixed maturity securities - AFS	4,119	4,420
Fixed maturity securities - trading	282	282
Measured at fair value on a recurring basis \| Other government-related securities
Assets:
Fixed maturity securities - AFS	642	717
Fixed maturity securities - trading	32	30
Measured at fair value on a recurring basis \| Corporate securities
Assets:
Fixed maturity securities - AFS	50,357	52,107
Fixed maturity securities - trading	1,772	1,860
Measured at fair value on a recurring basis \| Redeemable preferred stocks
Assets:
Fixed maturity securities - AFS	216	194
Fixed maturity securities - trading	11	13
Measured at fair value on a recurring basis \| Level 1
Assets:
Total fixed maturity securities	672	1,232
Equity securities	618	566
Other long-term investments	64	52
Short-term investments	484	403
Total investments	1,838	2,253
Cash	565	656
Assets related to separate accounts
Variable annuity	12,699	12,378
Variable universal life	1,646	1,287
Total assets measured at fair value on a recurring basis	16,748	16,574
Liabilities:
Annuity account balances	0	0
Other liabilities	26	14
Total liabilities measured at fair value on a recurring basis	26	14
Measured at fair value on a recurring basis \| Level 1 \| Fixed maturities
Assets:
Fixed maturity securities - AFS	633	1,140
Fixed maturity securities - trading	39	92
Measured at fair value on a recurring basis \| Level 1 \| Residential mortgage-backed securities
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Commercial mortgage-backed securities
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Other asset-backed securities
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| U.S. government-related securities
Assets:
Fixed maturity securities - AFS	483	1,015
Fixed maturity securities - trading	28	79
Measured at fair value on a recurring basis \| Level 1 \| States, municipals, and political subdivisions
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Other government-related securities
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Corporate securities
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 1 \| Redeemable preferred stocks
Assets:
Fixed maturity securities - AFS	150	125
Fixed maturity securities - trading	11	13
Measured at fair value on a recurring basis \| Level 2
Assets:
Total fixed maturity securities	67,181	69,375
Equity securities		0
Other long-term investments	1,271	1,285
Short-term investments	177	59
Total investments	68,629	70,719
Cash	0	0
Assets related to separate accounts
Variable annuity	0	0
Variable universal life	0	0
Total assets measured at fair value on a recurring basis	68,629	70,719
Liabilities:
Annuity account balances	0	0
Other liabilities	939	867
Total liabilities measured at fair value on a recurring basis	939	867
Measured at fair value on a recurring basis \| Level 2 \| Fixed maturities
Assets:
Fixed maturity securities - AFS	64,647	66,694
Fixed maturity securities - trading	2,534	2,681
Measured at fair value on a recurring basis \| Level 2 \| Residential mortgage-backed securities
Assets:
Fixed maturity securities - AFS	6,903	6,668
Fixed maturity securities - trading	181	209
Measured at fair value on a recurring basis \| Level 2 \| Commercial mortgage-backed securities
Assets:
Fixed maturity securities - AFS	2,393	2,502
Fixed maturity securities - trading	213	214
Measured at fair value on a recurring basis \| Level 2 \| Other asset-backed securities
Assets:
Fixed maturity securities - AFS	1,096	1,143
Fixed maturity securities - trading	74	91
Measured at fair value on a recurring basis \| Level 2 \| U.S. government-related securities
Assets:
Fixed maturity securities - AFS	477	500
Fixed maturity securities - trading	7	12
Measured at fair value on a recurring basis \| Level 2 \| States, municipals, and political subdivisions
Assets:
Fixed maturity securities - AFS	4,119	4,420
Fixed maturity securities - trading	282	282
Measured at fair value on a recurring basis \| Level 2 \| Other government-related securities
Assets:
Fixed maturity securities - AFS	642	717
Fixed maturity securities - trading	16	30
Measured at fair value on a recurring basis \| Level 2 \| Corporate securities
Assets:
Fixed maturity securities - AFS	48,951	50,675
Fixed maturity securities - trading	1,761	1,843
Measured at fair value on a recurring basis \| Level 2 \| Redeemable preferred stocks
Assets:
Fixed maturity securities - AFS	66	69
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3
Assets:
Total fixed maturity securities	2,006	1,988
Equity securities	123	101
Other long-term investments	289	299
Short-term investments	0	0
Total investments	2,418	2,388
Cash	0	0
Assets related to separate accounts
Variable annuity	0	0
Variable universal life	0	0
Total assets measured at fair value on a recurring basis	2,418	2,388
Liabilities:
Annuity account balances	66	67
Other liabilities	1,686	2,238
Total liabilities measured at fair value on a recurring basis	1,752	2,305
Measured at fair value on a recurring basis \| Level 3 \| Fixed maturities
Assets:
Fixed maturity securities - AFS	1,878	1,899
Fixed maturity securities - trading	128	89
Measured at fair value on a recurring basis \| Level 3 \| Residential mortgage-backed securities
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| Commercial mortgage-backed securities
Assets:
Fixed maturity securities - AFS	32	32
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| Other asset-backed securities
Assets:
Fixed maturity securities - AFS	440	435
Fixed maturity securities - trading	101	72
Measured at fair value on a recurring basis \| Level 3 \| U.S. government-related securities
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| States, municipals, and political subdivisions
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	0	0
Measured at fair value on a recurring basis \| Level 3 \| Other government-related securities
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	16	0
Measured at fair value on a recurring basis \| Level 3 \| Corporate securities
Assets:
Fixed maturity securities - AFS	1,406	1,432
Fixed maturity securities - trading	11	17
Measured at fair value on a recurring basis \| Level 3 \| Redeemable preferred stocks
Assets:
Fixed maturity securities - AFS	0	0
Fixed maturity securities - trading	$ 0	$ 0

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