Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 338	$ 539
Adjustments to reconcile net income to net cash provided by operating activities
Realized Investment Gains (Losses)	55	(102)
Amortization of deferred policy acquisition costs and present value of future profits	(731)	(742)
Increase (Decrease) in Deferred Policy Acquisition Costs	(695)	(708)
Depreciation and amortization	191	184
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	747	0
Other operating activities, net	291	114
Change in reinsurance recoverables	25	62
Increase (Decrease) in Deferred Income Taxes	40	(150)
Change in reserve for future policy benefits and unpaid losses and loss adjustment expenses and unearned premiums	443	301
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(1,162)	(370)
Net cash provided by operating activities	894	816
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Proceeds from Sale of Available-for-sale Securities, Debt	15,847	11,023
Proceeds from Sale and Maturity of Securities, Fair Value Option	76	85
Proceeds from Sale of Available-for-sale Securities, Equity	512	469
Proceeds from Sale and Collection of Mortgage Notes Receivable	351	201
Proceeds from Limited Partnership Investments	138	460
Payments for the purchase of investments [Abstract]
Fixed maturities, available-for-sale	(15,954)	(10,691)
Payments to Acquire Available-for-sale Securities, Fair Value Option		76
Equity securities, available-for-sale	(397)	(223)
Mortgage loans	(458)	(234)
Payments to Acquire Limited Partnership Interests	222	202
Derivatives, net	(40)	295
Payments for (Proceeds from) Policy Loans	(11)	(10)
Payments to Acquire Property, Plant, and Equipment	(92)	(137)
Proceeds from Sale of Short-term Investments	(1,453)	(666)
Other investing activities, net	(17)	27
Proceeds from Divestiture of Businesses	222	0
Net cash used for investing activities	(1,476)	341
Financing Activities
Additions to Contract Holders Funds	2,526	2,182
Withdrawals and other deductions from investment and universal life-type contracts	(7,076)	(8,070)
Net Change Contract Holders Funds	3,976	5,486
Repayments at maturity or settlement of consumer notes	(11)	(6)
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	1,346	136
Repayments of Short-term Debt	416
Proceeds from (Repayments of) Debt	500	0
Proceeds from (Repurchase of) Equity	(22)	10
Payments for Repurchase of Common Stock	(650)	(700)
Dividends paid on common stock	(173)	(170)
Net cash provided by (used for) financing activities	0	(1,132)
Foreign exchange rate effect on cash	62	(12)
Cash, Period Increase (Decrease)	(520)	13
Cash - beginning of period	882	448
Cash - end of period	362	461
Supplemental Disclosure of Cash Flow Information
Income taxes paid (received)	2	(130)
Interest paid	$ (164)	$ (168)