Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities
Net income (loss)	$ 1,192	$ 1,154	$ 1,515
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	143	(119)	(517)
Trading securities purchases, sales and maturities, net	168	146	309
Change in premiums and fees receivable	(54)	97	(53)
Change in accrued investment income	8	(21)	(20)
Change in future contract benefits and other contract holder funds	(1,024)	991	524
Change in reinsurance related assets and liabilities	226	(252)	(9)
Change in federal income tax accruals	69	61	229
Realized (gain) loss	339	151
Amortization of deferred gain on business sold through reinsurance	(73)	(74)	(74)
Proceeds From Reinsurance Recapture			422
Other	278	109	200
Net cash provided by (used in) operating activities	1,272	2,243	2,526
Cash Flows from Investing Activities
Purchases of available-for-sale securities	(11,113)	(9,429)	(8,636)
Sales of available-for-sale securities	2,959	1,351	1,118
Maturities of available-for-sale securities	5,364	4,408	5,212
Purchases of alternative investments	(302)	(324)	(370)
Sales and repayments of alternative investments	238	177	238
Issuance of mortgage loans on real estate	(2,155)	(1,959)	(1,374)
Repayment and maturities of mortgage loans on real estate	942	853	1,009
Issuance and repayment of policy loans, net	92	125	8
Net change in collateral on investments and derivatives	415	578	1,052
Proceeds from sale of subsidiary/business		75
Other	(106)	(78)	(62)
Net cash provided by (used in) investing activities	(3,666)	(4,223)	(1,805)
Cash Flows from Financing Activities
Payment of long-term debt, including current maturities	(600)	(250)	(500)
Issuance of long-term debt, net of issuance costs	395	298
Payment related to early extinguishment of debt	(59)
Proceeds from sales leaseback transaction	85	47	83
Deposits of fixed account values, including the fixed portion of variable	10,053	10,769	10,388
Withdrawals of fixed account values, including the fixed portion of variable	(5,505)	(6,126)	(5,840)
Transfers to and from separate accounts, net	(1,308)	(2,474)	(2,509)
Common stock issued for benefit plans and excess tax benefits	26	47	32
Repurchase of common stock	(879)	(900)	(650)
Dividends paid to common stockholders	(238)	(204)	(170)
Net cash provided by (used in) financing activities	1,970	1,207	834
Net increase (decrease) in cash and invested cash	(424)	(773)	1,555
Cash and invested cash as of beginning-of-year	3,146	3,919	2,364
Cash and invested cash as of end-of-year	$ 2,722	$ 3,146	$ 3,919