Consolidated Statements of Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net Income		$ 593	$ 514
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization		146	158
Realized investment (gains) losses		(46)	32
Deferred income taxes		11	11
Net changes in assets and liabilities, net of non-operating effects:
Premiums, accounts and notes receivable		(55)	(237)
Reinsurance recoverables		41	24
Deferred policy acquisition costs		(76)	(62)
Other assets		(22)	(57)
Insurance liabilities		868	507
Accounts payable, accrued expenses and other liabilities		(186)	(263)
Current income taxes		291	262
Distributions from partnership investments	[1]	45	27
Other, net		(31)	5
Net cash provided by (used in) operating activities	[1]	1,579	921
Proceeds from investments sold:
Fixed maturities and equity securities		414	361
Investment maturities and repayments:
Fixed maturities and equity securities		475	255
Commercial mortgage loans		21	18
Other sales, maturities and repayments (primarily short-term and other long-term investments)	[1]	667	75
Investments purchased or originated:
Fixed maturities and equity securities		(1,240)	(758)
Commercial mortgage loans		(107)	(1)
Other (primarily short-term and other long-term investments)		(256)	(198)
Property and equipment purchases, net		(91)	(112)
Net cash provided by (used in) investing activities	[1]	(117)	(360)
Cash Flows from Financing Activities
Deposits and interest credited to contractholder deposit funds		374	383
Withdrawals and benefit payments from contractholder deposit funds		(385)	(343)
Net change in short-term debt		(10)	(6)
Repayment of long-term debt		(250)	0
Repurchase of common stock		(239)	(139)
Issuance of common stock		38	10
Other, net		(43)	(51)
Net cash provided by (used in) financing activities		(515)	(146)
Effect of foreign currency rate changes on cash and cash equivalents		23	18
Net increase / (decrease) in cash and cash equivalents		970	433
Cash and cash equivalents, January 1		3,185	1,968
Cash and cash equivalents, March 31		4,155	2,401
Supplemental Disclosure of Cash Information:
Income taxes paid, net of refunds		(8)	37
Interest paid		$ 70	$ 69

[1] As required in adopting Accounting Standard Update ("ASU") 2016-15, the Company retrospectively reclassified $27 million of cash distributions from partnership earnings from investing to operating activities for the first quarter of 2016. The comparable amount reported in operating activities in 2017 was $45 million. See Note 2 for further discussion.