Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities
Net Income	$ 565	$ 751
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	299	270
Realized investment (gains) losses	(165)	(9)
Deferred income taxes	196	43
Gains on sale of businesses (excluding discontinued operations)	(8)	(9)
Net changes in assets and liabilities, net of non-operating effects:
Premiums, accounts and notes receivable	(192)	(96)
Reinsurance recoverables	356	37
Deferred policy acquisition costs	(140)	(72)
Other assets	251	(69)
Insurance liabilities	779	731
Accounts payable, accrued expenses and other liabilities	(359)	143
Current income taxes	(89)	129
Cash used to effectively exit run-off reinsurance business	(2,196)	0
Other, net	(20)	28
Net cash (used in) / provided by operating activities	(723)	1,877
Proceeds from investments sold:
Fixed maturities	1,269	347
Equity securities	3	8
Commercial mortgage loans	241	286
Other (primarily short-term and other long-term investments)	411	429
Investment maturities and repayments:
Fixed maturities	821	670
Equity securities	18	0
Commercial mortgage loans	57	199
Investments purchased:
Fixed maturities	(914)	(1,330)
Equity securities	(28)	(4)
Commercial mortgage loans	(22)	(208)
Other (primarily short-term and other long-term investments)	(460)	(415)
Property and equipment purchases	(209)	(208)
Acquisitions and dispositions, net of cash acquired	(40)	(3,197)
Net cash provided by / (used in) investing activities	1,147	(3,423)
Cash Flows from Financing Activities
Deposits and interest credited to contractholder deposit funds	738	688
Withdrawals and benefit payments from contractholder deposit funds	(669)	(626)
Change in cash overdraft position	29	9
Net change in short-term debt	(48)	122
Repayment of long-term debt	0	(326)
Repurchase of common stock	(277)	0
Issuance of common stock	91	52
Common dividends paid	(11)	(11)
Distributions to redeemable noncontrolling interest	(7)	0
Net cash provided by / (used in) by financing activities	(154)	(92)
Effect of foreign currency rate changes on cash and cash equivalents	(39)	(7)
Net increase / (decrease) in cash and cash equivalents	231	(1,645)
Cash and cash equivalents, January 1,	2,978	4,690
Cash and cash equivalents, June 30,	3,209	3,045
Supplemental Disclosure of Cash Information:
Income taxes paid, net of refunds	154	211
Interest paid	$ 130	$ 116