Condensed Consolidating Supplemental Guarantor Information - Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 416	$ 235
Expenditures for property, plant and equipment	(47)	(88)
Additions to capitalized software	(117)	(109)
Business acquisitions, net	0	(1,647)
Proceeds from (payment of) of intercompany notes	0	0
Changes in restricted cash	0	1,114
Investments in equity affiliates	0	0
Other investing activities, net	0	4
Net cash used in investing activities	(164)	(726)
Tax withholding payments on behalf of employees	(10)	(28)
Short term borrowings, net	0	2
Payments on term credit facility	(312)	(20)
Borrowings on term credit facility	0	250
Payments on revolving credit facility	(977)	(528)
Borrowings on revolving credit facility	881	690
Debt issuance costs	0	(3)
Proceeds from employee stock plans	12	10
Other financing activities	0	(3)
Equity contribution	0	0
Dividend distribution to consolidated subsidiaries	0	0
Borrowings (repayments from) intercompany notes	0	0
Net cash provided by financing activities	(406)	370
Net cash (used in) provided by operating activities	(27)	28
Effect of exchange rate changes on cash and cash equivalents	(27)	(11)
Increase (decrease) in cash and cash equivalents	(208)	(104)
Cash and cash equivalents	303	424	$ 511	$ 528
Parent Company [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	236	146
Expenditures for property, plant and equipment	(15)	(40)
Additions to capitalized software	(72)	(62)
Business acquisitions, net		(1,647)
Proceeds from (payment of) of intercompany notes	169	40
Changes in restricted cash		1,114
Investments in equity affiliates	(1)	(2)
Other investing activities, net	(7)	(3)
Net cash used in investing activities	74	(600)
Tax withholding payments on behalf of employees	(10)	(28)
Short term borrowings, net	0	0
Payments on term credit facility	(307)	(20)
Borrowings on term credit facility		250
Payments on revolving credit facility	(404)	(528)
Borrowings on revolving credit facility	404	690
Debt issuance costs		(3)
Proceeds from employee stock plans	12	10
Other financing activities	0	0
Equity contribution	0	0
Dividend distribution to consolidated subsidiaries	0	0
Borrowings (repayments from) intercompany notes	0	0
Net cash provided by financing activities	(305)	371
Net cash (used in) provided by operating activities	(27)	28
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	(22)	(55)
Cash and cash equivalents	18	20	40	75
Guarantor Subsidiary [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(226)	(90)
Expenditures for property, plant and equipment	0	0
Additions to capitalized software	0	0
Business acquisitions, net		0
Proceeds from (payment of) of intercompany notes	227	87
Changes in restricted cash		0
Investments in equity affiliates	0	0
Other investing activities, net	0	0
Net cash used in investing activities	227	87
Tax withholding payments on behalf of employees	0	0
Short term borrowings, net	0	0
Payments on term credit facility	0	0
Borrowings on term credit facility		0
Payments on revolving credit facility	0	0
Borrowings on revolving credit facility	0	0
Debt issuance costs		0
Proceeds from employee stock plans	0	0
Other financing activities	0	0
Equity contribution	0	0
Dividend distribution to consolidated subsidiaries	0	0
Borrowings (repayments from) intercompany notes	0	0
Net cash provided by financing activities	0	0
Net cash (used in) provided by operating activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	1	(3)
Cash and cash equivalents	10	8	9	11
Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	450	208
Expenditures for property, plant and equipment	(32)	(48)
Additions to capitalized software	(45)	(47)
Business acquisitions, net		0
Proceeds from (payment of) of intercompany notes	0	0
Changes in restricted cash		0
Investments in equity affiliates	0	0
Other investing activities, net	7	7
Net cash used in investing activities	(70)	(88)
Tax withholding payments on behalf of employees	0	0
Short term borrowings, net	0	2
Payments on term credit facility	(5)	0
Borrowings on term credit facility		0
Payments on revolving credit facility	(573)	0
Borrowings on revolving credit facility	477	0
Debt issuance costs		0
Proceeds from employee stock plans	0	0
Other financing activities	0	(3)
Equity contribution	1	2
Dividend distribution to consolidated subsidiaries	(44)	(29)
Borrowings (repayments from) intercompany notes	(396)	(127)
Net cash provided by financing activities	(540)	(155)
Net cash (used in) provided by operating activities	0	0
Effect of exchange rate changes on cash and cash equivalents	(27)	(11)
Increase (decrease) in cash and cash equivalents	(187)	(46)
Cash and cash equivalents	275	396	462	442
Consolidation, Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(44)	(29)
Expenditures for property, plant and equipment	0	0
Additions to capitalized software	0	0
Business acquisitions, net		0
Proceeds from (payment of) of intercompany notes	(396)	(127)
Changes in restricted cash		0
Investments in equity affiliates	1	2
Other investing activities, net	0	0
Net cash used in investing activities	(395)	(125)
Tax withholding payments on behalf of employees	0	0
Short term borrowings, net	0	0
Payments on term credit facility	0	0
Borrowings on term credit facility		0
Payments on revolving credit facility	0	0
Borrowings on revolving credit facility	0	0
Debt issuance costs		0
Proceeds from employee stock plans	0	0
Other financing activities	0	0
Equity contribution	(1)	(2)
Dividend distribution to consolidated subsidiaries	44	29
Borrowings (repayments from) intercompany notes	396	127
Net cash provided by financing activities	439	154
Net cash (used in) provided by operating activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents	$ 0	$ 0	$ 0	$ 0