Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net income	$ 565	$ 861
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gain on sale of business	0	(267)
Net realized capital gains	(39)	(37)
Stock-based compensation	48	69
Depreciation	190	178
Other intangible amortization	41	50
Benefit for deferred income taxes	(24)	(28)
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(1,392)	(1,087)
Other assets	(678)	(1,437)
Benefits payable	282	306
Other liabilities	1,198	923
Unearned revenues	(53)	(70)
Other, net	68	38
Net cash provided by (used in) operating activities	206	(501)
Cash flows from investing activities
Proceeds from sale of business	0	1,055
Acquisitions, net of cash acquired	(1)	(38)
Purchases of property and equipment	(256)	(259)
Purchases of investment securities	(2,528)	(1,721)
Maturities of investment securities	635	615
Proceeds from sales of investment securities	1,853	1,570
Net cash (used in) provided by investing activities	(297)	1,222
Cash flows from financing activities
Receipts (withdrawals) from contract deposits, net	221	(259)
Proceeds from issuance of commercial paper, net	0	300
Change in book overdraft	(109)	(25)
Common stock repurchases	(73)	(371)
Dividends paid	(90)	(86)
Excess tax benefit from stock-based compensation	0	14
Proceeds from stock option exercises and other	0	21
Net cash used in financing activities	(51)	(406)
(Decrease) increase in cash and cash equivalents	(142)	315
Cash and cash equivalents at beginning of period	2,571	1,935
Cash and cash equivalents at end of period	2,429	2,250
Supplemental cash flow disclosures:
Interest payments	92	95
Income tax payments, net	$ 536	$ 736