Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net income (loss)	$ 435	$ 211
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	15	5
Trading securities purchases, sales and maturities, net	23	28
Change in premiums and fees receivable	(35)	(25)
Change in accrued investment income	(62)	(38)
Change in future contract benefits and other contract holder funds	(281)	262
Change in reinsurance related assets and liabilities	(13)	(286)
Change in federal income tax accruals	40	(38)
Realized (gain) loss	39	114
Amortization of deferred gain on business sold through reinsurance	(18)	(18)
Other	(34)	83
Net cash provided by (used in) operating activities	109	298
Cash Flows from Investing Activities
Purchases of available-for-sale securities	(3,158)	(3,291)
Sales of available-for-sale securities	503	1,502
Maturities of available-for-sale securities	1,298	1,269
Purchases of alternative investments	(53)	(71)
Sales and repayments of alternative investments	53	32
Issuance of mortgage loans on real estate	(341)	(421)
Repayment and maturities of mortgage loans on real estate	229	182
Issuance and repayment of policy loans, net	18	11
Net change in collateral on investments and derivatives	(32)	106
Other	(16)	(26)
Net cash provided by (used in) investing activities	(1,499)	(707)
Cash Flows from Financing Activities
Deposits of fixed account values, including the fixed portion of variable	2,713	2,672
Withdrawals of fixed account values, including the fixed portion of variable	(1,530)	(1,413)
Transfers to and from separate accounts, net	(356)	(549)
Common stock issued for benefit plans and excess tax benefits	29	(10)
Repurchase of common stock	(200)	(200)
Dividends paid to common stockholders	(65)	(60)
Net cash provided by (used in) financing activities	591	440
Net increase (decrease) in cash and invested cash	(799)	31
Cash and invested cash as of beginning-of-year	2,722	3,146
Cash and invested cash as of end-of-year	$ 1,923	$ 3,177