Consolidated Income Statements - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenue	$ 3,771	$ 3,653	$ 3,916
Cost of revenue	2,310	2,249	2,403
Gross profit	1,461	1,404	1,513
Selling, general and administrative expenses	915	854	920
Research and development expenses	110	95	104
Restructuring charges	30	6	26
Operating income	406	449	463
Interest expense	70	55	54
Other non-operating income, net	4	0	1
Gain from sale of business	0	9	11
Income before taxes	340	403	421
Income tax expense	80	63	84
Net income	$ 260	$ 340	$ 337
Earnings per share:
Basic (in dollars per share)	$ 1.45	$ 1.88	$ 1.84
Diluted (in dollars per share)	$ 1.45	$ 1.87	$ 1.83
Basic (in shares)	179,106	180,893	183,077
Weighted average common shares outstanding — Diluted	180,038	181,737	184,249
Dividends declared per share (in usd per share)	$ 0.006196	$ 0.005632	$ 0.005120