INVESTMENTS - Schedule of Allowance for Credit Losses for AFS Debt Securities (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period		$ 8	$ 5	$ 8	$ 5
Gross write-offs		0	0	0	0
Gross recoveries		0	0	0	0
Net credit losses (NCLs)		0	0	0	0
Credit losses on securities without previous credit losses		0	0	0	0
Net reserve builds (releases) on securities with previous credit losses		(2)	0	(2)	0
Total provision for credit losses	[1]	(2)	0	(2)	0
Initial allowance on newly purchased credit-deteriorated securities during the period		0	0	0	0
Allowance for credit losses at end of period		6	5	6	5
Mortgage-backed securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period				0
Allowance for credit losses at end of period		0		0
U.S. Treasury and federal agency securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period				0
Allowance for credit losses at end of period		0		0
State and municipal securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period				0
Allowance for credit losses at end of period		0		0
Foreign government
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period				0
Allowance for credit losses at end of period		0		0
Corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at beginning of period		8	5	8	5
Gross write-offs		0	0	0	0
Gross recoveries		0	0	0	0
Net credit losses (NCLs)		0	0	0	0
Credit losses on securities without previous credit losses		0	0	0	0
Net reserve builds (releases) on securities with previous credit losses		(2)	0	(2)	0
Total provision for credit losses		(2)	0	(2)	0
Initial allowance on newly purchased credit-deteriorated securities during the period		0	0	0	0
Allowance for credit losses at end of period		$ 6	$ 5	$ 6	$ 5

[1] In accordance with ASC 326, which requires the provision for credit losses on AFS securities to be included in revenue.