Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities
Net (loss) income	$ (243)	$ 155
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	84	84
Stock-based compensation expense	30	25
Excess tax benefit from stock-based compensation	0	(1)
Deferred income taxes	(18)	(12)
(Gain) loss on investments	(15)	9
Impairment of goodwill	340	0
Changes in assets and liabilities:
Receivables	109	168
Inventories	(8)	6
Current payables and accrued expenses	(28)	2
Deferred revenue	74	53
Other assets and liabilities	(23)	(8)
Net cash provided by operating activities	302	481
Investing activities
Expenditures for property and equipment	(29)	(21)
Additions to capitalized software	(30)	(37)
Business acquisitions and other investing activities, net	14	(7)
Net cash used in investing activities	(45)	(65)
Financing activities
Repurchases of common stock	(308)	(184)
Proceeds from long-term borrowings	600	0
Repayments of long-term borrowings	(247)	(11)
Repayments of credit facility borrowings	(220)	0
Excess tax benefit from stock-based compensation	0	1
Other financing activities, net	14	14
Net cash used in financing activities	(161)	(180)
Effect of exchange rate changes on cash and cash equivalents	(9)	3
Increase in cash and cash equivalents	87	239
Cash and cash equivalents at beginning of period	834	695
Cash and cash equivalents at end of period	$ 921	$ 934