Consolidated Statements of Cash Flows - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities
Net Income		$ 1,403	$ 1,017
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization		286	310
Realized investment (gains) losses		(97)	(35)
Deferred income taxes (benefits)		31	(17)
Net changes in assets and liabilities, net of non-operating effects:
Premiums, accounts and notes receivable		(222)	(520)
Reinsurance recoverables		64	(4)
Deferred policy acquisition costs		(137)	(123)
Other assets		(71)	(83)
Insurance liabilities		973	607
Accounts payable, accrued expenses and other liabilities		(159)	(58)
Current income taxes		83	54
Distributions from partnership investments	[1]	74	71
Other, net		48	48
Net cash provided by (used in) operating activities	[1]	2,276	1,267
Proceeds from investments sold:
Fixed maturities and equity securities		930	712
Investment maturities and repayments:
Fixed maturities and equity securities		945	738
Commercial mortgage loans		118	69
Other sales, maturities and repayments (primarily short-term and other long-term investments)	[1]	1,059	285
Investments purchased or originated:
Fixed maturities and equity securities		(2,938)	(1,701)
Commercial mortgage loans		(194)	(16)
Other (primarily short-term and other long-term investments)		(444)	(401)
Property and equipment purchases, net		(194)	(254)
Acquisitions, net of cash acquired		(14)	(4)
Net cash provided by (used in) investing activities	[1]	(732)	(572)
Cash Flows from Financing Activities
Deposits and interest credited to contractholder deposit funds		686	779
Withdrawals and benefit payments from contractholder deposit funds		(733)	(703)
Net change in short-term debt		(14)	(111)
Repayment of long-term debt		(250)	0
Repurchase of common stock		(895)	(139)
Issuance of common stock		76	14
Other, net		(13)	(63)
Net cash provided by (used in) financing activities		(1,143)	(223)
Effect of foreign currency rate changes on cash and cash equivalents		25	14
Net increase / (decrease) in cash and cash equivalents		426	486
Cash and cash equivalents, January 1		3,185	1,968
Cash and cash equivalents, June 30		3,611	2,454
Supplemental Disclosure of Cash Information:
Income taxes paid, net of refunds		504	579
Interest paid		$ 123	$ 122

[1] As required in adopting Accounting Standard Update ("ASU") 2016-15, the Company retrospectively reclassified $71 million of cash distributions from partnership earnings from investing to operating activities for the six months ended June 30, 2016. The comparable amount reported in operating activities in 2017 was $74 million. See Note 2 for further discussion.