Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Activities
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 539	$ 880
Adjustments to reconcile net income to net cash provided by operating activities
Realized Investment Gains (Losses)	(102)	14
Amortization of deferred policy acquisition costs and present value of future profits	(742)	(778)
Increase (Decrease) in Deferred Policy Acquisition Costs	(708)	(703)
Depreciation and amortization	184	173
Gains (Losses) on Extinguishment of Debt	0	(21)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	0	8
Other operating activities, net	114	32
Change in reinsurance recoverables	62	(36)
Increase (Decrease) in Deferred Income Taxes	150	(204)
Change in reserve for future policy benefits and unpaid losses and loss adjustment expenses and unearned premiums	301	368
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(370)	(586)
Net cash provided by operating activities	816	1,109
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Proceeds from Sale of Available-for-sale Securities, Debt	11,023	13,325
Proceeds from Sale and Maturity of Securities, Fair Value Option	85	58
Proceeds from Sale of Available-for-sale Securities, Equity	469	1,043
Proceeds from Sale and Collection of Mortgage Notes Receivable	201	308
Proceeds from Limited Partnership Investments	460	253
Payments for the purchase of investments [Abstract]
Fixed maturities, available-for-sale	(10,691)	(14,075)
Payments to Acquire Available-for-sale Securities, Fair Value Option	76	148
Equity securities, available-for-sale	(223)	(860)
Mortgage loans	(234)	(464)
Payments to Acquire Limited Partnership Interests	202	296
Derivatives, net	295	(131)
Payments for (Proceeds from) Policy Loans	(10)	23
Payments to Acquire Property, Plant, and Equipment	(137)	(102)
Proceeds from Sale of Short-term Investments	(666)	1,579
Other investing activities, net	27	1
Net cash used for investing activities	341	468
Financing Activities
Additions to Contract Holders Funds	2,182	3,203
Withdrawals and other deductions from investment and universal life-type contracts	(8,070)	(8,724)
Net Change Contract Holders Funds	5,486	4,975
Repayments at maturity or settlement of consumer notes	(6)	(13)
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	136	311
Repayment of long-term debt		(585)
Return of shares under incentive and stock compensation plans and other to treasury stock	(10)	(18)
Payments for Repurchase of Common Stock	(700)	(500)
Dividends paid on common stock	(170)	(153)
Net cash provided by (used for) financing activities	(1,132)	(1,468)
Foreign exchange rate effect on cash	(12)	(15)
Cash, Period Increase (Decrease)	13	94
Cash - beginning of period	448	399
Cash - end of period	461	493
Supplemental Disclosure of Cash Flow Information
Income taxes paid (received)	(130)	47
Interest paid	$ (168)	$ (187)