Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Repayments of Short-term Debt	$ 416
Proceeds from (Repayments of) Debt	500	$ 0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	(26)	(10)
Operating Activities
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	378	323
Adjustments to reconcile net income to net cash provided by operating activities
Realized Investment Gains (Losses)	(20)	(155)
Amortization of deferred policy acquisition costs and present value of future profits	(363)	(374)
Increase (Decrease) in Deferred Policy Acquisition Costs	(352)	(354)
Depreciation and amortization	96	95
Other operating activities, net	111	81
Change in reinsurance recoverables	(7)	53
Increase (Decrease) in Deferred Income Taxes	256	(14)
Change in reserve for future policy benefits and unpaid losses and loss adjustment expenses and unearned premiums	293	158
Increase (Decrease) in Other Operating Assets and Liabilities, Net	(933)	(473)
Net cash provided by operating activities	225	398
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Proceeds from Sale of Available-for-sale Securities, Debt	8,020	5,460
Proceeds from Sale and Maturity of Securities, Fair Value Option	62	19
Proceeds from Sale of Available-for-sale Securities, Equity	216	414
Proceeds from Sale and Collection of Mortgage Notes Receivable	213	114
Proceeds from Limited Partnership Investments	83	235
Payments for the purchase of investments [Abstract]
Fixed maturities, available-for-sale	(7,809)	(5,752)
Payments to Acquire Available-for-sale Securities, Fair Value Option		38
Equity securities, available-for-sale	(278)	(130)
Mortgage loans	(199)	(128)
Payments to Acquire Limited Partnership Interests	86	88
Derivatives, net	(56)	189
Payments for (Proceeds from) Policy Loans	(2)	(2)
Payments to Acquire Property, Plant, and Equipment	(41)	(84)
Proceeds from Sale of Short-term Investments	(1,317)	(29)
Other investing activities, net	(18)	10
Net cash used for investing activities	(1,208)	194
Financing Activities
Additions to Contract Holders Funds	1,398	1,165
Withdrawals and other deductions from investment and universal life-type contracts	(3,773)	(4,174)
Net Change Contract Holders Funds	2,057	2,810
Repayments at maturity or settlement of consumer notes	(7)	(5)
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	1,115	64
Payments for Repurchase of Common Stock	(325)	(350)
Dividends paid on common stock	(87)	(85)
Net cash provided by (used for) financing activities	436	(565)
Foreign exchange rate effect on cash	2	4
Cash, Period Increase (Decrease)	(545)	31
Cash - beginning of period	882	448
Cash - end of period	337	479
Supplemental Disclosure of Cash Flow Information
Income taxes paid (received)	132	0
Interest paid	$ (71)	$ (71)