Consolidated Statements Of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Premiums	$ 23,501	$ 21,248	$ 46,344	$ 42,151
Administrative fees and other revenue	1,676	1,467	3,221	2,906
Total operating revenue	25,177	22,715	49,565	45,057
Net investment income	285	229	495	458
Net realized gains (losses) on financial instruments	11	4	89	(22)
Other-than-temporary impairment losses on investments:
Total other-than-temporary impairment losses on investments	(9)	(4)	(22)	(12)
Portion of other-than-temporary impairment losses recognized in other comprehensive income	2	0	5	0
Other-than-temporary impairment losses recognized in income	(7)	(4)	(17)	(12)
Total revenues	25,466	22,944	50,132	45,481
Expenses
Benefit expense	20,368	17,728	39,650	34,774
Cost of products sold	98	0	98	0
Selling, general and administrative expense	3,278	3,428	6,444	6,856
Interest expense	184	192	371	376
Amortization of other intangible assets	85	93	172	173
(Gain) loss on extinguishment of debt	0	(1)	(1)	18
Total expenses	24,013	21,440	46,734	42,197
Income before income tax expense	1,453	1,504	3,398	3,284
Income tax expense	314	450	708	918
Net income	$ 1,139	$ 1,054	$ 2,690	$ 2,366
Net income per share
Basic net income per share	$ 4.44	$ 4.07	$ 10.47	$ 9.20
Diluted net income per share	4.36	3.98	10.28	8.97
Dividends per share	$ 0.80	$ 0.75	$ 1.60	$ 1.50