Condensed Consolidated Statements Of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Premiums	$ 13,811	$ 13,398
Services	327	253
Investment income	141	111
Total revenues	14,279	13,762
Operating expenses:
Benefits	11,670	11,326
Operating costs	1,749	1,553
Merger termination fee and related costs, net	0	(947)
Depreciation and amortization	100	92
Total operating expenses	13,519	12,024
Income (loss) from operations	760	1,738
Interest expense	53	49
Income (loss) before income taxes	707	1,689
Provision for income taxes	216	574
Net income	$ 491	$ 1,115
Basic earnings per common share (in dollars per share)	$ 3.56	$ 7.54
Diluted earnings per common share (in dollars per share)	3.53	7.49
Dividends declared per common share (in dollars per share)	$ 0.5	$ 0.40