Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities
Net income (loss)	$ 367	$ 435
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Deferred acquisition costs, value of business acquired, deferred sales inducements and deferred front-end loads deferrals and interest, net of amortization	6	15
Trading securities purchases, sales and maturities, net	39	23
Change in premiums and fees receivable	(84)	(35)
Change in accrued investment income	(59)	(62)
Change in future contract benefits and other contract holder funds	(104)	(281)
Change in reinsurance related assets and liabilities	(113)	(13)
Change in federal income tax accruals	68	40
Realized (gain) loss	(12)	39
Amortization of deferred gain on business sold through reinsurance		(18)
Other	32	(34)
Net cash provided by (used in) operating activities	140	109
Cash Flows from Investing Activities
Purchases of available-for-sale securities and equity securities	(2,020)	(3,158)
Sales of available-for-sale securities and equity securities	427	503
Maturities of available-for-sale securities	1,368	1,298
Purchases of alternative investments	(63)	(53)
Sales and repayments of alternative investments	31	53
Issuance of mortgage loans on real estate	(546)	(341)
Repayment and maturities of mortgage loans on real estate	261	229
Issuance and repayment of policy loans, net	11	18
Net change in collateral on investments, derivatives and related settlements	(32)	(32)
Other	(32)	(16)
Net cash provided by (used in) investing activities	(595)	(1,499)
Cash Flows from Financing Activities
Payment of long-term debt, including current maturities	(487)
Issuance of long-term debt, net of issuance costs	1,094
Payment related to early extinguishment of debt	(23)
Deposits of fixed account values, including the fixed portion of variable	2,765	2,713
Withdrawals of fixed account values, including the fixed portion of variable	(1,498)	(1,530)
Transfers to and from separate accounts, net	(686)	(356)
Common stock issued for benefit plans	(9)	29
Repurchase of common stock		(200)
Dividends paid to common stockholders	(72)	(65)
Net cash provided by (used in) financing activities	1,084	591
Net increase (decrease) in cash, invested cash and restricted cash	629	(799)
Cash, invested cash and restricted cash as of beginning-of-year	1,628	2,722
Cash, invested cash and restricted cash as of end-of-period	$ 2,257	$ 1,923