Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities
Net Income	$ 1,725	$ 1,403
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	276	286
Realized investment (gains) losses	36	(97)
Deferred income taxes (benefits)	6	31
Net changes in assets and liabilities, net of non-operating effects:
Premiums, accounts and notes receivable	(5)	(222)
Reinsurance recoverables	60	64
Deferred policy acquisition costs	(139)	(137)
Other assets	244	(71)
Insurance liabilities	955	973
Accounts payable, accrued expenses and other liabilities	(246)	(159)
Current income taxes	70	83
Distributions from partnership investments	71	74
Other, net	(33)	48
Net cash provided by (used in) operating activities	3,020	2,276
Proceeds from investments sold:
Fixed maturities and equity securities	1,273	930
Investment maturities and repayments:
Fixed maturities and equity securities	887	945
Commercial mortgage loans	88	118
Other sales, maturities and repayments (primarily short-term and other long-term investments)	412	1,059
Investments purchased or originated:
Fixed maturities and equity securities	(3,544)	(2,938)
Commercial mortgage loans	(194)	(194)
Other (primarily short-term and other long-term investments)	(501)	(444)
Property and equipment purchases	(220)	(194)
Acquisitions, net of cash acquired	0	(14)
Net cash provided by (used in) investing activities	(1,799)	(732)
Cash Flows from Financing Activities
Deposits and interest credited to contractholder deposit funds	574	686
Withdrawals and benefit payments from contractholder deposit funds	(594)	(733)
Net change in short-term debt	(5)	(14)
Repayment of long-term debt	(131)	(250)
Repurchase of common stock	(310)	(895)
Issuance of common stock	27	76
Other, net	(103)	(13)
Net cash provided by (used in) financing activities	(542)	(1,143)
Effect of foreign currency rate changes on cash and cash equivalents	(17)	25
Net increase / (decrease) in cash and cash equivalents	662	426
Cash and cash equivalents, January 1,	2,972	3,185
Cash and cash equivalents, June 30,	3,634	3,611
Supplemental Disclosure of Cash Information:
Income taxes paid, net of refunds	519	504
Interest paid	$ 127	$ 123