Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Premiums	$ 32,307	$ 30,626	$ 29,642
Fees and other revenues	4,867	4,760	4,488
Net investment income	1,226	1,147	1,153
Mail order pharmacy revenues	2,979	2,966	2,536
Realized investment gains (losses):
Other-than-temporary impairments on fixed maturities	(27)	(35)	(112)
Other realized investment gains (losses), net	264	204	169
Net realized investment gains (losses)	237	169	57
Total revenues	41,616	39,668	37,876
Benefits and Expenses
Global Health Care medical costs	19,967	19,009	18,354
Other benefit expenses	5,439	5,477	4,936
Mail order pharmacy costs	2,456	2,468	2,134
Other operating expenses	10,033	9,584	8,982
Amortization of other acquired intangible assets, net	115	151	143
Total benefits and expenses	38,010	36,689	34,549
Income before Income Taxes	3,606	2,979	3,327
Income taxes (benefits):
Current	1,132	1,062	1,229
Deferred	242	74	21
Total income taxes	1,374	1,136	1,250
Net Income	2,232	1,843	2,077
Less: Net Income (Loss) Attributable to Noncontrolling Interests	(5)	(24)	(17)
Shareholders' Net Income	$ 2,237	$ 1,867	$ 2,094
Shareholders' Net Income Per Share:
Basic	$ 8.92	$ 7.31	$ 8.17
Diluted	8.77	7.19	8.04
Dividends Declared Per Share	$ 0.04	$ 0.04	$ 0.04