Condensed Consolidated Statements Of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Premiums	$ 13,203	$ 13,650	$ 26,601	$ 27,090
Services	230	262	483	522
Investment income	101	95	212	195
Total revenues	13,534	14,007	27,296	27,807
Operating expenses:
Benefits	10,889	11,509	22,215	22,906
Operating costs	1,453	1,699	3,006	3,433
Merger termination fee and related costs, net	0	27	(947)	61
Depreciation and amortization	92	89	184	177
Total operating expenses	12,434	13,324	24,458	26,577
Income from operations	1,100	683	2,838	1,230
Interest expense	58	47	107	94
Income before income taxes	1,042	636	2,731	1,136
Provision for income taxes	392	325	966	571
Net income	$ 650	$ 311	$ 1,765	$ 565
Basic earnings per common share (in dollars per share)	$ 4.49	$ 2.08	$ 12.07	$ 3.79
Diluted earnings per common share (in dollars per share)	4.46	2.06	11.98	3.75
Dividends per common share (in dollars per share)	$ 0.40	$ 0.29	$ 0.80	$ 0.58