REVISION OF PRIOR PERIOD FINANCIAL STATEMENTS - Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2020		Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Other invested assets	$ 1,802	[1]	$ 2,280	$ 2,124	$ 2,780	[1]
Deferred policy acquisition costs	4,171		4,090	4,697	5,837					$ 6,705
GMIB reinsurance contract asset, at fair value	2,818				2,139					1,734
Other assets	4,476	[1]			3,800	[1]				3,147
Total Assets	262,496		254,018	240,681	249,818					220,779
LIABILITIES
Future policy benefits and other policyholders' liabilities	41,139		41,506	38,001	34,635					31,077
Current and deferred income taxes	1,648		1,822	2,327	528					35
Total Liabilities	243,549		234,893	218,889	234,406					205,224
EQUITY
Retained earnings	12,032		12,899	17,007	11,744					13,937
Accumulated other comprehensive income (loss)	4,188				844					(1,408)
Total equity attributable to Holdings	17,300		17,498	19,981	13,456					13,802
Total Equity	18,852		19,038	21,535	15,047		$ 16,482	$ 16,217	$ 14,591	15,368	$ 16,411
Total Liabilities, Redeemable Noncontrolling Interest and Equity	$ 262,496		254,018	240,681	249,818					220,779
As Previously Reported
ASSETS
Other invested assets			2,280	2,112
Deferred policy acquisition costs			4,182	4,809	5,890					6,745
GMIB reinsurance contract asset, at fair value					2,139					1,732
Other assets					3,799					3,127
Total Assets			254,110	240,781	249,870					220,797
LIABILITIES
Future policy benefits and other policyholders' liabilities			41,476	37,968	34,587					30,998
Current and deferred income taxes			1,848	2,355	549					68
Total Liabilities			234,889	218,884	234,379					205,178
EQUITY
Retained earnings			12,995	17,112	11,827					13,989
Accumulated other comprehensive income (loss)					840					(1,396)
Total equity attributable to Holdings			17,594	20,086	13,535					13,866
Total Equity			19,134	21,640	15,126		16,478	16,388	14,682	15,432	16,518
Total Liabilities, Redeemable Noncontrolling Interest and Equity			254,110	240,781	249,870					220,797
Impact of Revisions
ASSETS
Other invested assets			0	12
Deferred policy acquisition costs			(92)	(112)	(53)					(40)
GMIB reinsurance contract asset, at fair value					0					2
Other assets					1					20
Total Assets			(92)	(100)	(52)					(18)
LIABILITIES
Future policy benefits and other policyholders' liabilities			30	33	48					79
Current and deferred income taxes			(26)	(28)	(21)					(33)
Total Liabilities			4	5	27					46
EQUITY
Retained earnings			(96)	(105)	(83)					(52)
Accumulated other comprehensive income (loss)					4					(12)
Total equity attributable to Holdings			(96)	(105)	(79)					(64)
Total Equity			(96)	(105)	(79)		$ 4	$ (171)	$ (91)	(64)	$ (107)
Total Liabilities, Redeemable Noncontrolling Interest and Equity			$ (92)	$ (100)	$ (52)					$ (18)

[1] See Note 2 for details of balances with variable interest entities.