CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Premiums	$ 9,088	$ 8,852	$ 28,029	$ 26,468
Services	467	356	1,251	1,035
Investment income	96	93	289	273
Total revenues	9,651	9,301	29,569	27,776
Operating expenses:
Benefits	7,467	7,147	23,469	21,761
Operating costs	1,408	1,361	4,175	3,810
Depreciation and amortization	75	67	218	201
Total operating expenses	8,950	8,575	27,862	25,772
Income from operations	701	726	1,707	2,004
Interest expense	26	27	78	82
Income before income taxes	675	699	1,629	1,922
Provision for income taxes	249	254	599	702
Net income	$ 426	$ 445	$ 1,030	$ 1,220
Basic earnings per common share	$ 2.65	$ 2.71	$ 6.34	$ 7.34
Diluted earnings per common share	$ 2.62	$ 2.67	$ 6.27	$ 7.24
Dividends declared per common share	$ 0.26	$ 0.25	$ 0.77	$ 0.50