Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net income	$ 368	$ 473
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized capital gains	(1)	(5)
Stock-based compensation	33	32
Depreciation and amortization	107	102
Benefit for deferred income taxes	(26)	0
Changes in operating assets and liabilities, net of effect of businesses acquired:
Receivables	(524)	(588)
Other assets	(566)	(130)
Benefits payable	539	311
Other liabilities	684	190
Unearned revenues	57	13
Other, net	0	14
Net cash provided by operating activities	671	412
Cash flows from investing activities
Acquisitions, net of cash acquired	(6)	(5)
Proceeds from sale of business	72	0
Purchases of property and equipment	(106)	(90)
Purchases of investment securities	(507)	(783)
Maturities of investment securities	258	294
Proceeds from sales of investment securities	118	192
Net cash used in investing activities	(171)	(392)
Cash flows from financing activities
Receipts (withdrawals) from contract deposits, net	220	236
Change in book overdraft	(136)	(34)
Common stock repurchases	(49)	(94)
Dividends paid	(44)	(42)
Excess tax benefit from stock-based compensation	8	1
Proceeds from stock option exercises and other	25	5
Net cash provided by financing activities	24	72
Increase in cash and cash equivalents	524	92
Cash and cash equivalents at beginning of period	1,138	1,306
Cash and cash equivalents at end of period	1,662	1,398
Supplemental cash flow disclosures:
Interest payments	10	10
Income tax payments, net	$ 12	$ 1