INVESTMENTS - Net Unrealized Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Beginning balance	$ 48	$ 4,082	$ (1,074)	$ 7,483
Net unrealized investment gains (losses)	(1,548)	(2,752)	(618)	(11,528)
Ending balance	(2,165)	1,092	(2,165)	1,092
Unrealized gains (losses) on investments
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Beginning balance			(8,873)
Ending balance	(9,385)		(9,385)
Unrealized gains (losses) on investments | Unrealized Investment Gains Losses, All Other | Net Unrealized Gains (Losses) on Investments
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Beginning balance	(8,187)	(6,647)	(9,116)	4,462
Net investment gains (losses) arising during the period	(2,329)	(3,811)	(1,514)	(15,466)
Included in net income (loss)	444	327	564	881
Impact of net unrealized investment gains (losses)	0	0	0	0
Ending balance	(10,071)	(10,130)	(10,071)	(10,130)
Unrealized gains (losses) on investments | Unrealized Investment Gains Losses, All Other | Policyholders’ Liabilities
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Beginning balance	11	25	21	(703)
Net investment gains (losses) arising during the period	0	0	0	0
Included in net income (loss)	0	0	0	0
Impact of net unrealized investment gains (losses)	8	8	(2)	736
Ending balance	19	33	19	33
Unrealized gains (losses) on investments | Unrealized Investment Gains Losses, All Other | Deferred Income Tax Asset (Liability)
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Beginning balance	1,717	1,391	420	(790)
Net investment gains (losses) arising during the period	0	0	0	0
Included in net income (loss)	0	0	0	0
Impact of net unrealized investment gains (losses)	394	730	1,690	2,909
Ending balance	2,111	2,121	2,111	2,121
Unrealized gains (losses) on investments | Unrealized Investment Gains Losses, All Other | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Beginning balance	(6,459)	(5,231)	(8,675)	2,969
Net investment gains (losses) arising during the period	(2,329)	(3,811)	(1,514)	(15,466)
Included in net income (loss)	444	327	564	881
Impact of net unrealized investment gains (losses)	402	738	1,688	3,645
Ending balance	(7,941)	(7,976)	(7,941)	(7,976)
Unrealized gains (losses) on investments | Net unrealized investment gains (losses) excluding credit losses | Net Unrealized Gains (Losses) on Investments
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses)	(10,072)	(10,131)	(10,066)	(10,123)
Unrealized gains (losses) on investments | Net unrealized investment gains (losses) excluding credit losses | Policyholders’ Liabilities
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses)	19	33	19	33
Unrealized gains (losses) on investments | Net unrealized investment gains (losses) excluding credit losses | Deferred Income Tax Asset (Liability)
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses)	2,111	2,121	2,110	2,119
Unrealized gains (losses) on investments | Net unrealized investment gains (losses) excluding credit losses | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses)	(7,942)	(7,977)	(7,937)	(7,971)
Unrealized gains (losses) on investments | Net unrealized investment gains (losses) with credit losses | Net Unrealized Gains (Losses) on Investments
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses)	1	1	(5)	(7)
Unrealized gains (losses) on investments | Net unrealized investment gains (losses) with credit losses | Policyholders’ Liabilities
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses)	0	0	0	0
Unrealized gains (losses) on investments | Net unrealized investment gains (losses) with credit losses | Deferred Income Tax Asset (Liability)
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses)	0	0	1	2
Unrealized gains (losses) on investments | Net unrealized investment gains (losses) with credit losses | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]
Net unrealized investment gains (losses)	$ 1	$ 1	$ (4)	$ (5)