Condensed Consolidated Statements Of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Premiums	$ 13,713	$ 13,203	$ 27,524	$ 26,601
Services	382	230	709	483
Investment income	164	101	305	212
Total revenues	14,259	13,534	28,538	27,296
Operating expenses:
Benefits	11,536	10,889	23,206	22,215
Operating costs	1,761	1,453	3,510	3,006
Merger termination fee and related costs, net	0	0	0	(947)
Depreciation and amortization	100	92	200	184
Total operating expenses	13,397	12,434	26,916	24,458
Income (loss) from operations	862	1,100	1,622	2,838
Loss on business held-for-sale	(790)		(790)	0
Interest expense	53	58	106	107
Income (loss) before income taxes	19	1,042	726	2,731
(Benefit) provision for income taxes	(174)	392	42	966
Net income	$ 193	$ 650	$ 684	$ 1,765
Basic earnings per common share (in dollars per share)	$ 1.40	$ 4.49	$ 4.96	$ 12.07
Diluted earnings per common share (in dollars per share)	1.39	4.46	4.93	11.98
Dividends declared per common share (in dollars per share)	$ 0.5	$ 0.40	$ 1	$ 0.8