SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		$ (963)	$ 951
Net investment income		955	1,000
Acquisition and operating expenses		(1,308)	(1,256)
Income tax (expense) or benefit		(116)	(291)
Net of tax		$ 29	$ 1,879
U.S. federal statutory income tax rate		21.00%	21.00%
Reclassification Out Of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax		$ 32	$ 132
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)		40	168
Income tax (expense) or benefit	[1]	(8)	(35)
Net of tax		32	133
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)
Income tax (expense) or benefit	[1]	0	0
Net of tax		(1)	$ (1)
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]	1
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
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
Net of tax		$ 1

[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).