SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		$ 423			$ 199			$ 1,101	$ 885
Net investment income		1,004			920			2,946	2,760
Acquisition and operating expenses		(1,285)			(1,299)			(3,843)	(4,028)
Income tax (expense) or benefit		(236)			452			(581)	(109)
Net of tax		$ 1,569	$ 1,634	$ 1,188	$ 1,781	$ 1,394	$ 1,047	$ 4,391	$ 4,222
U.S. federal statutory income tax rate		21.00%			21.00%			21.00%	21.00%
Reclassification Out Of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax		$ 31			$ 39			$ 95	$ 183
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		41			58			125	252
Income tax (expense) or benefit	[1]	(9)			(12)			(26)	(53)
Net of tax		32			46			99	199
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		(1)			(1)			(3)	(3)
Net investment income								(1)
Earnings before income taxes								(4)
Income tax (expense) or benefit	[1]	0			0			1	1
Net of tax		(1)			(1)			(3)	(2)
Reclassification Out Of Accumulated Other Comprehensive Income | Pension liability adjustment, actuarial gains (losses)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Acquisition and operating expenses	[2]	0			(7)			(1)	(18)
Reclassification Out Of Accumulated Other Comprehensive Income | Pension liability adjustment, prior service (cost) credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Acquisition and operating expenses	[2]	0			0			0	0
Reclassification Out Of Accumulated Other Comprehensive Income | Pension Liability Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) or benefit	[1]	0			1			0	4
Net of tax		$ 0			$ (6)			$ (1)	$ (14)

[1] Based on 21% tax rate

[2] These accumulated other comprehensive income components are included in the computation of net periodic benefit cost (see Note 12 for additional details).