OTHER COMPREHENSIVE INCOME (LOSS) - Components of Accumulated Other Comprehensive Income (Loss), Net of Tax, in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 5,654
Current period change	$ (42)	$ (414)	86	$ (807)
Ending balance	6,290	6,146	6,290	6,146
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(720)	(302)	(848)	91
Current period change	(42)	(414)	86	(807)
Ending balance	(762)	(716)	(762)	(716)
URA(D) on securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(695)	(270)	(816)	122
Current period change	(38)	(405)	83	(797)
Ending balance	(734)	(675)	(734)	(675)
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	8	18	2	20
Current period change	(4)	(10)	2	(12)
Ending balance	4	8	4	8
Benefit plan net gain (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(33)	(50)	(33)	(51)
Current period change	0	1	1	2
Ending balance	$ (32)	$ (49)	$ (32)	$ (49)