Condensed Consolidating Supplemental Guarantor Information - Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 144	$ 246
Expenditures for property, plant and equipment	(24)	(31)
Additions to capitalized software	(74)	(79)
Proceeds from (payment of) of intercompany notes	0	0
Investments in equity affiliates	0	0
Proceeds from divestiture	47	0
Other investing activities, net	(8)	(3)
Net cash used in investing activities	(59)	(113)
Short term borrowings, net	1	28
Payments on term credit facility	(73)	(116)
Payments on revolving credit facility	(431)	(608)
Borrowings on revolving credit facility	706	512
Repurchase of common shares	250	0
Debt issuance costs	(8)	0
Proceeds from employee stock plans	6	11
Equity contribution	0	0
Dividend distribution to consolidated subsidiaries	0	0
Borrowings (repayments from) intercompany notes	0	0
Tax withholding payments on behalf of employees	(7)	(10)
Net cash provided by financing activities	(56)	(183)
Net cash (used in) provided by operating activities	(20)	(17)
Effect of exchange rate changes on cash and cash equivalents	(5)	(19)
Increase (decrease) in cash and cash equivalents	4	(86)
Cash and cash equivalents	332	425	$ 328	$ 511
Parent Company [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	203	62
Expenditures for property, plant and equipment	(9)	(8)
Additions to capitalized software	(45)	(48)
Proceeds from (payment of) of intercompany notes	123	96
Investments in equity affiliates	(9)	(1)
Proceeds from divestiture	22
Other investing activities, net	(8)	(7)
Net cash used in investing activities	74	32
Short term borrowings, net	(4)	15
Payments on term credit facility	(67)	(111)
Payments on revolving credit facility	(351)	(223)
Borrowings on revolving credit facility	426	223
Repurchase of common shares	250
Debt issuance costs	(8)
Proceeds from employee stock plans	6	11
Equity contribution	0	0
Dividend distribution to consolidated subsidiaries	0	0
Borrowings (repayments from) intercompany notes	0	0
Tax withholding payments on behalf of employees	(7)	(10)
Net cash provided by financing activities	(255)	(95)
Net cash (used in) provided by operating activities	(20)	(17)
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	2	(18)
Cash and cash equivalents	17	26	15	44
Guarantor Subsidiary [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(74)	(75)
Expenditures for property, plant and equipment	0	0
Additions to capitalized software	0	0
Proceeds from (payment of) of intercompany notes	78	80
Investments in equity affiliates	0	0
Proceeds from divestiture	0
Other investing activities, net	0	0
Net cash used in investing activities	78	80
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
Repurchase of common shares	0
Debt issuance costs	0
Proceeds from employee stock plans	0	0
Equity contribution	0	0
Dividend distribution to consolidated subsidiaries	0	0
Borrowings (repayments from) intercompany notes	0	0
Tax withholding payments on behalf of employees	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	(2)	0
Increase (decrease) in cash and cash equivalents	2	5
Cash and cash equivalents	22	14	20	9
Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	17	300
Expenditures for property, plant and equipment	(15)	(23)
Additions to capitalized software	(29)	(31)
Proceeds from (payment of) of intercompany notes	0	0
Investments in equity affiliates	0	0
Proceeds from divestiture	25
Other investing activities, net	0	4
Net cash used in investing activities	(19)	(50)
Short term borrowings, net	5	13
Payments on term credit facility	(6)	(5)
Payments on revolving credit facility	(80)	(385)
Borrowings on revolving credit facility	280	289
Repurchase of common shares	0
Debt issuance costs	0
Proceeds from employee stock plans	0	0
Equity contribution	9	1
Dividend distribution to consolidated subsidiaries	(2)	(41)
Borrowings (repayments from) intercompany notes	(201)	(176)
Tax withholding payments on behalf of employees	0	0
Net cash provided by financing activities	5	(304)
Net cash (used in) provided by operating activities	0	0
Effect of exchange rate changes on cash and cash equivalents	(3)	(19)
Increase (decrease) in cash and cash equivalents	0	(73)
Cash and cash equivalents	293	385	293	458
Consolidation, Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(2)	(41)
Expenditures for property, plant and equipment	0	0
Additions to capitalized software	0	0
Proceeds from (payment of) of intercompany notes	(201)	(176)
Investments in equity affiliates	9	1
Proceeds from divestiture	0
Other investing activities, net	0	0
Net cash used in investing activities	(192)	(175)
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
Repurchase of common shares	0
Debt issuance costs	0
Proceeds from employee stock plans	0	0
Equity contribution	(9)	(1)
Dividend distribution to consolidated subsidiaries	2	41
Borrowings (repayments from) intercompany notes	201	176
Tax withholding payments on behalf of employees	0	0
Net cash provided by financing activities	194	216
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