SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Statements of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Net investment income										$ 5,223	$ 5,085	$ 4,990
Other revenues										604	602	539
Total revenues		$ 4,344	$ 4,638	$ 4,310	$ 3,965	$ 4,531	$ 4,264	$ 4,020	$ 3,609	17,258	16,424	14,257
Expenses
Operating and administrative expenses										2,210	1,953	1,766
Total expenses		3,863	4,888	3,889	3,697	4,064	3,732	3,569	3,174	16,339	14,539	13,127
Income (loss) before federal income taxes, equity in income (loss) of subsidiaries, less dividends										919	1,885	1,130
Federal income tax expense (benefit)										33	244	(949)
Net income (loss)		$ 431	$ (161)	$ 363	$ 252	$ 399	$ 490	$ 385	$ 367	886	1,641	2,079
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Unrealized investment gains (losses)										5,288	(3,449)	1,643
Foreign currency translation adjustment										6	(9)	13
Funded status of employee benefit plans										(28)	(7)	8
Total other comprehensive income (loss), net of tax										5,266	(3,465)	1,664
Comprehensive income (loss)										6,152	(1,824)	3,743
Parent Company [Member]
Revenues
Dividends from subsidiaries	[1]									830	1,025	1,069
Interest from subsidiaries	[1]									158	148	133
Net investment income										11	7	2
Realized gain (loss)										2	3	(3)
Total revenues										1,001	1,183	1,201
Expenses
Operating and administrative expenses										51	18	40
Interest - subsidiaries	[1]									48	34	21
Interest - other										311	288	247
Total expenses										410	340	308
Income (loss) before federal income taxes, equity in income (loss) of subsidiaries, less dividends										591	843	893
Federal income tax expense (benefit)										(52)	(42)	(20)
Income (loss) before equity in income (loss) of subsidiaries, less dividends										643	885	913
Equity in income (loss) of subsidiaries, less dividends	[1]									243	756	1,166
Net income (loss)										886	1,641	2,079
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Unrealized investment gains (losses)										5,288	(3,449)	1,643
Foreign currency translation adjustment										6	(9)	13
Funded status of employee benefit plans										(28)	(7)	8
Total other comprehensive income (loss), net of tax										5,266	(3,465)	1,664
Comprehensive income (loss)										$ 6,152	$ (1,824)	$ 3,743

[1] Eliminated in consolidation.