Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]
Revenue	$ 873	$ 797	$ 2,422	$ 2,246
Cost of services rendered and products sold	481	419	1,309	1,180
Selling and administrative expenses	229	199	651	592
Amortization expense	8	7	20	20
401(k) Plan corrective contribution		(4)		(3)
Fumigation related matters	1		1	2
Impairment of software and other related costs				2
Restructuring charges	1	14	13	17
American Home Shield spin-off charges	8	7	23	7
Interest expense	40	38	115	113
Interest and net investment income	(3)	(1)	(5)	(3)
Loss on extinguishment of debt	10	3	10	6
Income from Continuing Operations before Income Taxes	100	114	285	313
Provision for income taxes	29	34	77	109
Income from Continuing Operations	71	80	207	204
Gain from discontinued operations, net of income taxes				1
Net Income	71	80	207	204
Total Comprehensive Income	$ 73	$ 83	$ 224	$ 208
Weighted-average common shares outstanding - Basic	135.6	134.3	135.4	134.2
Weighted-average common shares outstanding - Diluted	136.0	135.2	135.8	135.4
Basic Earnings Per Share:
Income from Continuing Operations (in dollars per share)	$ 0.52	$ 0.60	$ 1.53	$ 1.52
Gain from discontinued operations, net of income taxes (in dollars per share)
Net Income (in dollars per share)	0.52	0.60	1.53	1.52
Diluted Earnings Per Share:
Income from Continuing Operations (in dollars per share)	0.52	0.59	1.53	1.50
Gain from discontinued operations, net of income taxes (in dollars per share)
Net Income (in dollars per share)	$ 0.52	$ 0.59	$ 1.52	$ 1.51