Quarterly financial data (unaudited)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly financial data (unaudited)

Quarterly financial data (unaudited)

	2016 Quarters ended
(In millions, except per share data)	December 31		September 30		June 30		March 31
Product sales	$	5,663	$	5,516	$	5,474	$	5,239
Gross profit from product sales	$	4,596	$	4,489	$	4,424	$	4,221
Net income	$	1,935	$	2,017	$	1,870	$	1,900
Earnings per share:
Basic	$	2.61	$	2.70	$	2.49	$	2.52
Diluted	$	2.59	$	2.68	$	2.47	$	2.50
	2015 Quarters ended
(In millions, except per share data)	December 31		September 30		June 30		March 31
Product sales	$	5,329	$	5,516	$	5,225	$	4,874
Gross profit from product sales	$	4,258	$	4,482	$	4,136	$	3,841
Net income	$	1,800	$	1,863	$	1,653	$	1,623
Earnings per share:
Basic	$	2.39	$	2.46	$	2.18	$	2.13
Diluted	$	2.37	$	2.44	$	2.15	$	2.11