Quarterly financial data (unaudited)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly financial data (unaudited)

14.Quarterly financial data (unaudited)

	Quarter
2015	1st			2nd			3rd			4th
Revenue	$	3,150		$	3,232		$	3,429		$	3,189
Gross profit		1,816			1,881			1,997			1,866
Included in Operating profit:
Acquisition charges		83			82			83			81
Restructuring charges/other		(2	)		(1	)		—			(68	)
Operating profit		958			1,010			1,164			1,142
Net income		656			696			798			836
Earnings per common share:
Basic earnings per common share	$	0.62		$	0.66		$	0.77		$	0.81
Diluted earnings per common share		0.61			0.65			0.76			0.80
	Quarter
2014	1st			2nd			3rd			4th
Revenue	$	2,983		$	3,292		$	3,501		$	3,269
Gross profit		1,607			1,881			2,044			1,895
Included in Operating profit:
Acquisition charges		83			82			83			82
Restructuring charges/other		(11	)		(4	)		(9	)		(27	)
Operating profit		690			982			1,175			1,100
Net income		487			683			826			825
Earnings per common share:
Basic earnings per common share	$	0.44		$	0.63		$	0.77		$	0.78
Diluted earnings per common share		0.44			0.62			0.76			0.76