Condensed Consolidated Statements Of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
Premiums	$ 11,607	$ 9,698	$ 34,274	$ 29,267
Services	536	528	1,620	1,581
Investment income	95	93	278	278
Total revenues	12,238	10,319	36,172	31,126
Operating expenses:
Benefits	9,666	8,075	28,417	24,361
Operating costs	1,898	1,540	5,518	4,447
Depreciation and amortization	85	83	246	243
Total operating expenses	11,649	9,698	34,181	29,051
Income from operations	589	621	1,991	2,075
Interest expense	38	35	108	105
Income before income taxes	551	586	1,883	1,970
Provision for income taxes	261	218	881	709
Net income	$ 290	$ 368	$ 1,002	$ 1,261
Basic earnings per common share (in dollars per share)	$ 1.87	$ 2.34	$ 6.46	$ 7.98
Diluted earnings per common share (in dollars per share)	$ 1.85	$ 2.31	$ 6.39	$ 7.90
Dividends per common share (in dollars per share)	$ 0.28	$ 0.27	$ 0.83	$ 0.80