Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net income (loss)	$ 499	$ 886	$ 1,641
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Realized (gain) loss	513	610	(141)
Trading securities purchases, sales and maturities, net	266	(2,510)	(118)
Amortization of deferred gain on business sold through reinsurance	(41)	(31)	(9)
Change in:
Deferred acquisition costs, value of business acquired, deferred sales inducements and deferred front-end loads deferrals and interest, net of amortization	48	(409)	(81)
Premiums and fees receivable	(21)	105	(87)
Accrued investment income	(84)	(29)	(17)
Insurance liabilities and reinsurance-related balances	(699)	(1,613)	613
Accrued expenses	(18)	107	(101)
Federal income tax accruals	(98)	(227)	154
Other	169	425	89
Net cash provided by (used in) operating activities	534	(2,686)	1,943
Cash Flows from Investing Activities
Purchases of available-for-sale securities and equity securities	(16,761)	(15,326)	(12,650)
Sales of available-for-sale securities and equity securities	1,426	6,807	3,668
Maturities of available-for-sale securities	5,354	6,571	6,004
Purchase of common stock in acquisition, net of cash acquired			(1,410)
Sale of business, net			(12)
Purchases of alternative investments	(396)	(433)	(314)
Sales and repayments of alternative investments	171	131	178
Issuance of mortgage loans on real estate	(1,800)	(4,262)	(2,927)
Repayment and maturities of mortgage loans on real estate	1,154	1,163	1,085
Issuance (repayment) of policy loans, net	50	32	21
Net change in collateral on investments, derivatives and related settlements	1,474	79	735
Other	(153)	(261)	(193)
Net cash provided by (used in) investing activities	(9,481)	(5,499)	(5,815)
Cash Flows from Financing Activities
Payment of long-term debt, including current maturities	(1,096)	(308)	(537)
Issuance of long-term debt, net of issuance costs	1,289	744	1,094
Payment related to early extinguishment of debt	(13)	(42)	(23)
Proceeds from sale-leaseback transactions			88
Payment related to sale-leaseback transactions	(47)	(83)
Proceeds from certain financing arrangements	109	107
Deposits of fixed account values, including the fixed portion of variable	14,034	16,069	13,638
Withdrawals of fixed account values, including the fixed portion of variable	(6,113)	(5,849)	(6,007)
Transfers to and from separate accounts, net	528	(1,362)	(2,469)
Common stock issued for benefit plans	(7)	(20)	(6)
Repurchase of common stock	(275)	(550)	(900)
Dividends paid to common stockholders	(311)	(303)	(289)
Other	(6)
Net cash provided by (used in) financing activities	8,092	8,403	4,589
Net increase (decrease) in cash, invested cash and restricted cash	(855)	218	717
Cash, invested cash and restricted cash as of beginning-of-year	2,563	2,345	1,628
Cash, invested cash and restricted cash as of end-of-year	$ 1,708	$ 2,563	$ 2,345