SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		$ (511)	$ 423	$ 555	$ 123	$ (521)	$ 199	$ 564	$ 122	$ 590	$ 363	$ 468
Net investment income		865	1,004	999	943	896	920	937	903	3,811	3,656	3,818
Earnings before income taxes		289	1,805	1,825	1,342	538	1,329	1,708	1,294	5,262	4,869	5,208
Acquisition and operating expenses										(5,228)	(5,384)	(5,870)
Income tax (expense) benefit		$ (21)	$ (236)	$ (191)	$ (154)	$ (342)	$ 452	$ (314)	$ (247)	(603)	(451)	(977)
Net of tax										$ 4,659	$ 4,418	$ 4,231
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										$ 127	$ 335	$ (9)
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)										166	453	31
Income tax (expense) benefit	[1]									(35)	(95)	(7)
Net of tax										131	358	24
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)	(4)	(5)
Net investment income										(1)	(1)	(1)
Earnings before income taxes										(5)	(5)	(6)
Income tax (expense) benefit	[1]									1	1	1
Net of tax										(4)	(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]									0	(24)	(35)
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
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]									0	5	7
Net of tax										$ 0	$ (19)	$ (28)

[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 14 for additional details).