Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Premiums	$ 94,173	$ 85,421	$ 83,648
Administrative fees and other revenue	8,968	5,920	5,413
Total operating revenue	103,141	91,341	89,061
Net investment income	1,005	970	867
Net realized gains (losses) on financial instruments	114	(180)	145
Other than temporary impairment losses on investments:
Total other-than-temporary impairment losses on investments	(53)	(29)	(35)
Portion of other-than-temporary impairment losses recognized in other comprehensive income	6	3	2
Other-than-temporary impairment losses recognized in income	(47)	(26)	(33)
Total revenues	104,213	92,105	90,040
Expenses
Benefit expense	81,786	71,895	72,236
Cost of products sold	1,992	0	0
Selling, general and administrative expense	13,364	14,020	12,650
Interest expense	746	753	739
Amortization of other intangible assets	338	358	169
Loss on extinguishment of debt	2	11	282
Total expenses	98,228	87,037	86,076
Income before income tax expense	5,985	5,068	3,964
Income tax expense	1,178	1,318	121
Net income	$ 4,807	$ 3,750	$ 3,843
Net income per share
Basic net income per share	$ 18.81	$ 14.53	$ 14.70
Diluted net income per share:
Diluted net income per share	18.47	14.19	14.35
Dividends per share	$ 3.20	$ 3.00	$ 2.70