CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Premiums	$ 9,166	$ 8,849	$ 18,941	$ 17,616
Services	434	344	784	679
Investment income	99	91	193	180
Total revenues	9,699	9,284	19,918	18,475
Operating expenses:
Benefits	7,652	7,269	16,002	14,614
Operating costs	1,384	1,193	2,767	2,449
Depreciation and amortization	73	68	143	134
Total operating expenses	9,109	8,530	18,912	17,197
Income from operations	590	754	1,006	1,278
Interest expense	26	28	52	55
Income before income taxes	564	726	954	1,223
Provision for income taxes	208	266	350	448
Net income	$ 356	$ 460	$ 604	$ 775
Basic earnings per common share	$ 2.19	$ 2.76	$ 3.70	$ 4.64
Diluted earnings per common share	$ 2.16	$ 2.71	$ 3.65	$ 4.57
Dividends declared per common share	$ 0.26	$ 0.25	$ 0.51	$ 0.25