SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		$ 275			$ (1,408)			$ (1,109)	$ 239
Net investment income		1,067			1,006			3,103	3,100
Acquisition and operating expenses		(1,310)			(1,262)			(3,946)	(3,715)
Income tax (expense) or benefit		(355)			(185)			(694)	(741)
Net of tax		$ 1,639	$ 599	$ 29	$ (93)	$ 1,755	$ 1,879	$ 2,267	$ 3,541
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		$ 24			$ 41			$ 44	$ 213
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)		32			53			58	271
Income tax (expense) or benefit	[1]	(7)			(11)			(12)	(57)
Net of tax		25			42			46	214
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)
Income tax (expense) or benefit	[1]	0			0			1	1
Net of tax		(1)			(1)			(2)	(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			0			0	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			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			0			0	0
Net of tax		$ 0			$ 0			$ 0	$ 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).