SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Statements Of Cash Flows) (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
Cash Flows from Operating Activities
Net income (loss)		$ 431	$ (161)	$ 363	$ 252	$ 399	$ 490	$ 385	$ 367	$ 886	$ 1,641	$ 2,079
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Other										425	89	100
Net cash provided by (used in) operating activities										(2,686)	1,943	788
Cash Flows from Investing Activities
Net change in collateral on investments, derivatives and related settlements										79	735	(429)
Sales of available-for-sale securities and equity securities										6,807	3,668	1,612
Sale of business, net											(12)
Net cash provided by (used in) investing activities										(5,499)	(5,815)	(4,188)
Cash Flows from Financing Activities
Payment of long-term debt, including current maturities										(308)	(537)
Issuance of long-term debt, net of issuance costs										744	1,094
Payment related to early extinguishment of debt										(42)	(23)
Repurchase of common stock										(550)	(900)	(725)
Dividends paid to common stockholders										(303)	(289)	(262)
Net cash provided by (used in) financing activities										8,403	4,589	2,306
Net increase (decrease) in cash, invested cash and restricted cash										218	717	(1,094)
Cash, invested cash and restricted cash as of beginning-of-year					2,345				1,628	2,345	1,628	2,722
Cash, invested cash and restricted cash as of end-of-year		2,563				2,345				2,563	2,345	1,628
Parent Company [Member]
Cash Flows from Operating Activities
Net income (loss)										886	1,641	2,079
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity in (income) loss of subsidiaries greater than distributions	[1]									(243)	(756)	(1,166)
Realized (gain) loss										(2)	(3)	3
Change in federal income tax accruals										24	15	107
Other										106	(27)	20
Net cash provided by (used in) operating activities										771	870	1,043
Cash Flows from Investing Activities
Capital contribution to subsidiaries	[1]									(50)	(502)	(60)
Net change in collateral on investments, derivatives and related settlements										(279)	89	(42)
Net cash provided by (used in) investing activities										(329)	(413)	(102)
Cash Flows from Financing Activities
Payment of long-term debt, including current maturities										(308)	(537)
Issuance of long-term debt, net of issuance costs										744	1,094
Payment related to early extinguishment of debt										(42)	(23)
Increase (decrease) in loans from subsidiaries, net	[1]									264	52	(230)
Increase (decrease) in loans to subsidiaries, net	[1]									(70)	(48)	239
Common stock issued for benefit plans										(20)	(6)	46
Repurchase of common stock										(550)	(900)	(725)
Dividends paid to common stockholders										(303)	(289)	(262)
Net cash provided by (used in) financing activities										(285)	(657)	(932)
Net increase (decrease) in cash, invested cash and restricted cash										157	(200)	9
Cash, invested cash and restricted cash as of beginning-of-year					$ 420				$ 620	420	620	611
Cash, invested cash and restricted cash as of end-of-year		$ 577				$ 420				$ 577	$ 420	$ 620

[1] Eliminated in consolidation.