SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		$ 363	$ 468	$ (270)
Net investment income		3,656	3,818	3,638
Acquisition and operating expenses		(5,745)	(6,208)	(6,192)
Total before tax		4,604	5,322	4,159
Income tax (expense) benefit		(403)	(997)	619
Net of tax		$ 4,201	$ 4,325	$ 4,778
U.S. federal statutory corporate income tax rate		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		$ 335	$ (9)	$ (149)
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)		453	31	(159)
Income tax (expense) benefit	[1]	(95)	(7)	33
Net of tax		358	24	(126)
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)		(4)	(5)
Net investment income		(1)	(1)
Total before tax		(5)	(6)
Income tax (expense) benefit	[1]	1	1
Net of tax		(4)	(5)
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]	(24)	(35)	(32)
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	3
Reclassification out of Accumulated Other Comprehensive Income | Pension liability adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax (expense) benefit	[1]	5	7	6
Net of tax		$ (19)	$ (28)	$ (23)

[1] Based on 21% tax rate

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 14 for additional details).