Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities
Net income (loss)	$ 1,264	$ 1,002
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	38	183
Trading securities purchases, sales and maturities, net	83	128
Change in premiums and fees receivable	60	21
Change in accrued investment income	(75)	(47)
Change in future contract benefits and other contract holder funds	(1,152)	(807)
Change in reinsurance related assets and liabilities	80	(276)
Change in accrued expenses	(21)	(124)
Change in federal income tax accruals	154	143
Realized (gain) loss	105	121
Amortization of deferred gain on business sold through reinsurance	(22)	(55)
Other	95	391
Net cash provided by (used in) operating activities	609	680
Cash Flows from Investing Activities
Purchases of available-for-sale securities	(7,465)	(8,278)
Sales of available-for-sale securities	1,104	2,411
Maturities of available-for-sale securities	4,100	4,001
Purchases of alternative investments	(228)	(222)
Sales and repayments of alternative investments	140	173
Issuance of mortgage loans on real estate	(1,342)	(1,402)
Repayment and maturities of mortgage loans on real estate	849	649
Issuance and repayment of policy loans, net	34	72
Net change in collateral on investments and derivatives	90	1,064
Other	(66)	(80)
Net cash provided by (used in) investing activities	(2,784)	(1,612)
Cash Flows from Financing Activities
Proceeds from sales leaseback transaction	45
Deposits of fixed account values, including the fixed portion of variable	7,625	7,432
Withdrawals of fixed account values, including the fixed portion of variable	(4,309)	(4,138)
Transfers to and from separate accounts, net	(1,183)	(1,200)
Common stock issued for benefit plans	38	(9)
Repurchase of common stock	(600)	(675)
Dividends paid to common stockholders	(198)	(180)
Net cash provided by (used in) financing activities	1,418	1,230
Net increase (decrease) in cash and invested cash	(757)	298
Cash and invested cash as of beginning-of-year	2,722	3,146
Cash and invested cash as of end-of-period	$ 1,965	$ 3,444