SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment gains (losses)		$ 468		$ (270)		$ (135)
Net investment income		3,818		3,638		3,578
Acquisition and operating expenses		(6,208)		(6,192)		(5,920)
Total before tax		5,322		4,159		4,445
Income tax (expense) benefit		(997)		619		(1,141)
Net of tax		$ 4,325		$ 4,778		$ 3,304
U.S. federal statutory corporate income tax rate		21.00%		21.00%		21.00%
Blended statutory income tax rate						26.00%
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax		$ (9)		$ (149)		$ 2
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)		31		(159)		18
Income tax (expense) benefit		(7)	[1]	33	[2]	(5)	[3]
Net of tax		24		(126)		13
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)		(5)
Net investment income		(1)
Total before tax		(6)
Income tax (expense) benefit		1
Net of tax		(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	[4]	(35)		(32)		(15)
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	[4]	0		3		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		7	[1]	6	[2]	4	[3]
Net of tax		$ (28)		$ (23)		$ (11)

[1] Based on 21% tax rate

[2] Based on 21% tax rate

[3] Based on 26% blended tax rate

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