Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income	$ 1,175	$ 1,002
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of business	(267)	0
Net realized capital gains	(88)	(9)
Stock-based compensation	92	76
Depreciation	263	240
Other intangible amortization	72	85
Provision (benefit) for deferred income taxes	13	(30)
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	56	(68)
Other assets	(1,080)	(960)
Benefits payable	447	783
Other liabilities	(140)	238
Unearned revenues	(64)	40
Other, net	52	28
Net cash provided by operating activities	531	1,425
Cash flows from investing activities
Proceeds from sale of business	1,055	72
Acquisitions, net of cash acquired	(38)	(3)
Purchases of property and equipment	(384)	(361)
Purchases of investment securities	(4,345)	(1,949)
Maturities of investment securities	881	702
Proceeds from sales of investment securities	3,448	1,171
Net cash provided by (used in) investing activities	617	(368)
Cash flows from financing activities
Receipts (withdrawals) from contract deposits, net	(984)	(743)
Proceeds from issuance of senior notes, net	0	1,733
Proceeds from issuance of commercial paper, net	10	0
Change in book overdraft	(38)	(136)
Common stock repurchases	(380)	(270)
Dividends paid	(129)	(129)
Excess tax benefit from stock-based compensation	15	10
Proceeds from stock option exercises and other	20	45
Net cash (used in) provided by financing activities	(1,486)	510
(Decrease) increase in cash and cash equivalents	(338)	1,567
Cash and cash equivalents at beginning of period	1,935	1,138
Cash and cash equivalents at end of period	1,597	2,705
Supplemental cash flow disclosures:
Interest payments	105	83
Income tax payments, net	$ 1,038	$ 852