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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Operating activities      
Net income $ 15 $ 7  
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 95 103  
Stock-based compensation expense 50 51  
Deferred income taxes (11) (22)  
Changes in assets and liabilities:      
Receivables 182 182  
Inventories (15) (11)  
Current payables and accrued expenses (8) 0  
Deferred revenue 7 (2)  
Other assets and liabilities (58) (7)  
Net cash provided by operating activities 257 301  
Investing activities      
Expenditures for property and equipment (92) (59)  
Additions to capitalized software (5) (7)  
Business acquisitions and other investing activities, net 0 (18)  
Net cash used in investing activities (97) (84)  
Financing activities      
Repurchases of common stock (206) (351)  
Repayments of long-term borrowings (40) (23)  
Proceeds from credit facility borrowings 0 180  
Repayments of credit facility borrowings (240) 0  
Payment of capital lease (1) 0  
Other financing activities, net 23 20  
Net cash used in financing activities (464) (174)  
Effect of exchange rate changes on cash, cash equivalents and restricted cash (17) 8  
(Decrease) increase in cash, cash equivalents and restricted cash (321) 51  
Cash, cash equivalents and restricted cash at beginning of period 1,089 974 $ 974
Cash, cash equivalents and restricted cash at end of period 768 $ 1,025 1,089
Noncash or Part Noncash Acquisition, Value of Assets Acquired [Abstract]      
Assets acquired by capital lease $ 23   $ 0