INCOME TAXES - Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation
Expected income tax (expense) benefit	$ 291	$ 517	$ 309
Non-taxable investment income	91	73	104
Tax audit interest	(8)	(14)	(11)
Tax settlements/uncertain tax position release	231	0	12
Tax credits	21	0	0
Change in tax law	0	0	46
Other	1	3	(4)
Total	$ 627	$ 579	$ 456