Condensed Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Premiums	$ 11,083	$ 9,868
Services	538	525
Investment income	91	93
Total revenues	11,712	10,486
Operating expenses:
Benefits	9,124	8,195
Operating costs	1,785	1,446
Depreciation and amortization	82	80
Total operating expenses	10,991	9,721
Income from operations	721	765
Interest expense	35	35
Income before income taxes	686	730
Provision for income taxes	318	257
Net income	$ 368	$ 473
Basic earnings per common share	$ 2.37	$ 2.97
Diluted earnings per common share	$ 2.35	$ 2.95
Dividends per common share	$ 0.27	$ 0.26