INVESTMENT OPERATIONS - Amortized Cost and Fair Value of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	$ 66,042	$ 63,220
Gross Unrealized Gains	5,289	7,053
Gross Unrealized Losses	(295)	(131)
Allowance for Expected Credit Losses	(1)	(23)
Fair Value	71,035	70,119
Residential mortgage-backed securities
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	6,876	6,510
Gross Unrealized Gains	31	159
Gross Unrealized Losses	(102)	(1)
Allowance for Expected Credit Losses	0	0
Fair Value	6,805	6,668
Commercial mortgage-backed securities
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	2,239	2,429
Gross Unrealized Gains	75	128
Gross Unrealized Losses	(7)	(19)
Allowance for Expected Credit Losses	0	(4)	$ 0
Fair Value	2,307	2,534
Other asset-backed securities
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	1,391	1,546
Gross Unrealized Gains	31	40
Gross Unrealized Losses	(2)	(7)
Allowance for Expected Credit Losses	0	(1)	0
Fair Value	1,420	1,578
U.S. government-related securities
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	821	1,492
Gross Unrealized Gains	12	26
Gross Unrealized Losses	(25)	(3)
Allowance for Expected Credit Losses	0	0
Fair Value	808	1,515
Other government-related securities
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	680	622
Gross Unrealized Gains	75	96
Gross Unrealized Losses	(2)	(1)
Allowance for Expected Credit Losses	0	0
Fair Value	753	717
States, municipals, and political subdivisions
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	3,747	3,902
Gross Unrealized Gains	410	519
Gross Unrealized Losses	(1)	(1)
Allowance for Expected Credit Losses	0	0
Fair Value	4,156	4,420
Corporate securities
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	49,211	46,150
Gross Unrealized Gains	4,645	6,074
Gross Unrealized Losses	(156)	(99)
Allowance for Expected Credit Losses	(1)	(18)	0
Fair Value	53,699	52,107
Preferred Stock
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	297	183
Gross Unrealized Gains	10	11
Gross Unrealized Losses	0	0
Allowance for Expected Credit Losses	0	0
Fair Value	307	194
Total fixed maturity securities - AFS
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	65,262	62,834
Gross Unrealized Gains	5,289	7,053
Gross Unrealized Losses	(295)	(131)
Allowance for Expected Credit Losses	(1)	(23)	$ 0
Fair Value	70,255	69,733
Short-term investments
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	780	386
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for Expected Credit Losses	0	0
Fair Value	780	386
Public utility securities
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	6,500	6,300
Fair Value	7,000	7,000
Foreign government securities
Debt Securities, Trading and Available-for-sale [Abstract]
Amortized Cost	620	557
Fair Value	$ 687	$ 644

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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