Condensed Consolidating Supplemental Guarantor Information - Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Net cash provided by (used in) operating activities	$ 163	$ 270
Expenditures for property, plant and equipment	(104)	(81)
Additions to capitalized software	(130)	(125)
Proceeds from Sale of Property, Plant, and Equipment	3	6
Proceeds from (payment of) of intercompany notes	0	0
Investments in equity affiliates		0
Other investing activities, net	(4)	0
Net cash used in investing activities	(235)	(200)
Short term borrowings, net	7	10
Payments on term credit facility	(51)	(37)
Payments on revolving credit facility	(1,433)	(1,110)
Borrowings on revolving credit facility	1,608	1,335
Repurchases of Company common stock	(210)	(350)
Proceeds from employee stock plans	16	11
Proceeds from (Payments for) Other Financing Activities	0	(1)
Equity contribution		0
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries	0	0
Borrowings (repayments from) intercompany notes	0	0
Tax withholding payments on behalf of employees	(30)	(24)
Net cash used in financing activities	(93)	(166)
Net cash used in operating activities	(23)	(14)
Effect of exchange rate changes on cash and cash equivalents	(12)	16
Decrease in cash, cash equivalents, and restricted cash	(200)	(94)
Cash and Cash Equivalents, at Carrying Value	334	405	$ 537
Restricted Cash	9	8
Cash, cash equivalents and restricted cash at beginning of period	543	507
Cash, cash equivalents and restricted cash at end of period	343	413
Eliminations
Net cash provided by (used in) operating activities	(14)	(7)
Expenditures for property, plant and equipment	0	0
Additions to capitalized software	0	0
Proceeds from Sale of Property, Plant, and Equipment	0	0
Proceeds from (payment of) of intercompany notes	(352)	(237)
Investments in equity affiliates		2
Other investing activities, net	0	0
Net cash used in investing activities	(352)	(235)
Short term borrowings, net	0	0
Payments on term credit facility	0	0
Payments on revolving credit facility	0	0
Borrowings on revolving credit facility	0	0
Repurchases of Company common stock		0
Proceeds from employee stock plans	0	0
Proceeds from (Payments for) Other Financing Activities		0
Equity contribution		(2)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries	14	7
Borrowings (repayments from) intercompany notes	352	237
Tax withholding payments on behalf of employees	0	0
Net cash used in financing activities	366	242
Net cash used in operating activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Decrease in cash, cash equivalents, and restricted cash	0	0
Cash and Cash Equivalents, at Carrying Value	0	0	0
Restricted Cash	0	0
Cash, cash equivalents and restricted cash at beginning of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0
Parent Issuer
Net cash provided by (used in) operating activities	226	332
Expenditures for property, plant and equipment	(85)	(55)
Additions to capitalized software	(111)	(101)
Proceeds from Sale of Property, Plant, and Equipment	1	0
Proceeds from (payment of) of intercompany notes	207	182
Investments in equity affiliates		(2)
Other investing activities, net	(4)	(1)
Net cash used in investing activities	8	23
Short term borrowings, net	(1)	0
Payments on term credit facility	(51)	(34)
Payments on revolving credit facility	(1,055)	(1,070)
Borrowings on revolving credit facility	1,055	1,095
Repurchases of Company common stock	(210)	(350)
Proceeds from employee stock plans	16	11
Proceeds from (Payments for) Other Financing Activities		(1)
Equity contribution		0
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries	0	0
Borrowings (repayments from) intercompany notes	0	0
Tax withholding payments on behalf of employees	(30)	(24)
Net cash used in financing activities	(276)	(373)
Net cash used in operating activities	(23)	(14)
Effect of exchange rate changes on cash and cash equivalents	0	0
Decrease in cash, cash equivalents, and restricted cash	(65)	(32)
Cash and Cash Equivalents, at Carrying Value	31	35	97
Restricted Cash	1	0
Cash, cash equivalents and restricted cash at beginning of period	97	67
Cash, cash equivalents and restricted cash at end of period	32	35
Guarantor Subsidiary
Net cash provided by (used in) operating activities	(151)	(58)
Expenditures for property, plant and equipment	0	0
Additions to capitalized software	0	0
Proceeds from Sale of Property, Plant, and Equipment	0	0
Proceeds from (payment of) of intercompany notes	145	55
Investments in equity affiliates		0
Other investing activities, net	0	0
Net cash used in investing activities	145	55
Short term borrowings, net	0	0
Payments on term credit facility	0	0
Payments on revolving credit facility	0	0
Borrowings on revolving credit facility	0	0
Repurchases of Company common stock		0
Proceeds from employee stock plans	0	0
Proceeds from (Payments for) Other Financing Activities		0
Equity contribution		0
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries	0	0
Borrowings (repayments from) intercompany notes	0	0
Tax withholding payments on behalf of employees	0	0
Net cash used in financing activities	0	0
Net cash used in operating activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	1
Decrease in cash, cash equivalents, and restricted cash	(6)	(2)
Cash and Cash Equivalents, at Carrying Value	5	10	11
Restricted Cash	0	0
Cash, cash equivalents and restricted cash at beginning of period	11	12
Cash, cash equivalents and restricted cash at end of period	5	10
Non-Guarantor Subsidiaries
Net cash provided by (used in) operating activities	102	3
Expenditures for property, plant and equipment	(19)	(26)
Additions to capitalized software	(19)	(24)
Proceeds from Sale of Property, Plant, and Equipment	2	6
Proceeds from (payment of) of intercompany notes	0	0
Investments in equity affiliates		0
Other investing activities, net	0	1
Net cash used in investing activities	(36)	(43)
Short term borrowings, net	8	10
Payments on term credit facility	0	(3)
Payments on revolving credit facility	(378)	(40)
Borrowings on revolving credit facility	553	240
Repurchases of Company common stock		0
Proceeds from employee stock plans	0	0
Proceeds from (Payments for) Other Financing Activities		0
Equity contribution		2
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries	(14)	(7)
Borrowings (repayments from) intercompany notes	(352)	(237)
Tax withholding payments on behalf of employees	0	0
Net cash used in financing activities	(183)	(35)
Net cash used in operating activities	0	0
Effect of exchange rate changes on cash and cash equivalents	(12)	15
Decrease in cash, cash equivalents, and restricted cash	(129)	(60)
Cash and Cash Equivalents, at Carrying Value	298	360	$ 429
Restricted Cash	8	8
Cash, cash equivalents and restricted cash at beginning of period	435	428
Cash, cash equivalents and restricted cash at end of period	$ 306	$ 368