Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net income (loss)	$ 886	$ 1,641	$ 2,079
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Trading securities purchases, sales and maturities, net	(2,510)	(118)	121
Deferred acquisition costs, value of business acquired, deferred sales inducements and deferred front-end loads deferrals and interest, net of amortization	(409)	(81)	16
Change in premiums and fees receivable	105	(87)	34
Change in accrued investment income	(29)	(17)	(16)
Change in future contract benefits and other contract holder funds	(1,479)	(105)	(1,720)
Change in reinsurance related assets and liabilities	(134)	718	128
Change in accrued expenses	107	(101)	113
Change in federal income tax accruals	(227)	154	(1,119)
Realized (gain) loss	610	(141)	170
Amortization of deferred gain on business sold through reinsurance	(31)	(9)	(23)
Impairment of intangibles			905
Other	425	89	100
Net cash provided by (used in) operating activities	(2,686)	1,943	788
Cash Flows from Investing Activities
Purchases of available-for-sale securities and equity securities	(15,326)	(12,650)	(10,148)
Sales of available-for-sale securities and equity securities	6,807	3,668	1,612
Maturities of available-for-sale securities	6,571	6,004	5,886
Purchase of common stock in acquisition, net of cash acquired		(1,410)
Sale of business, net		(12)
Purchases of alternative investments	(433)	(314)	(357)
Sales and repayments of alternative investments	131	178	184
Issuance of mortgage loans on real estate	(4,262)	(2,927)	(2,058)
Repayment and maturities of mortgage loans on real estate	1,163	1,085	1,184
Issuance and repayment of policy loans, net	32	21	51
Net change in collateral on investments, derivatives and related settlements	79	735	(429)
Other	(261)	(193)	(113)
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)
Proceeds from sale-leaseback transactions		88	62
Payments related to sale-leaseback transactions	(83)
Proceeds from certain financing arrangements	107
Deposits of fixed account values, including the fixed portion of variable	16,069	13,638	10,797
Withdrawals of fixed account values, including the fixed portion of variable	(5,849)	(6,007)	(5,825)
Transfers to and from separate accounts, net	(1,362)	(2,469)	(1,787)
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	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	2,722
Cash, invested cash and restricted cash as of end-of-year	$ 2,563	$ 2,345	$ 1,628