Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities
Net income	$ 712	$ 893
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized capital gains	(3)	(10)
Stock-based compensation	55	51
Depreciation and amortization	213	206
Benefit for deferred income taxes	(39)	(8)
Changes in operating assets and liabilities, net of effect of businesses acquired:
Receivables	(1,137)	(860)
Other assets	(914)	(108)
Benefits payable	885	378
Other liabilities	641	52
Unearned revenues	42	(37)
Other, net	16	28
Net cash provided by operating activities	471	585
Cash flows from investing activities
Acquisitions, net of cash acquired	(3)	(12)
Proceeds from sale of business	72	33
Purchases of property and equipment	(216)	(187)
Purchases of investment securities	(968)	(1,385)
Maturities of investment securities	512	549
Proceeds from sales of investment securities	1,007	854
Net cash provided by (used in) investing activities	404	(148)
Cash flows from financing activities
Receipts (withdrawals) from contract deposits, net	(127)	132
Change in book overdraft	(109)	(78)
Common stock repurchases	(152)	(231)
Dividends paid	(86)	(83)
Excess tax benefit from stock-based compensation	9
Proceeds from stock option exercises and other	45	36
Net cash used in financing activities	(420)	(224)
Increase in cash and cash equivalents	455	213
Cash and cash equivalents at beginning of period	1,138	1,306
Cash and cash equivalents at end of period	1,593	1,519
Supplemental cash flow disclosures:
Interest payments	73	72
Income tax payments, net	$ 601	$ 511