SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		$ 123	$ 122
Acquisition and operating expenses		(1,308)	(1,396)
Income tax (expense) or benefit		(154)	(247)
Net of tax		$ 1,188	$ 1,047
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		$ 44	$ 55
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)		57	77
Income tax (expense) or benefit	[1]	(12)	(16)
Net of tax		45	61
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]	0	(6)
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
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
Net of tax		$ 0	$ (5)

[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).