Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net income	$ 73	$ 101
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	15	13
Currency exchange rate differences on financial transactions and other losses	2	1
Depreciation and amortization	155	147
Changes in operating assets and liabilities, net of effect of businesses acquired and divested:
Trade and other receivables, net	(53)	3
Prepaid expenses and other assets	(65)	(45)
Accounts payable and other current liabilities and deferred revenues	(133)	(191)
Other non-current liabilities	(1)	(7)
Interest payable	56	50
Income taxes	(9)	15
Net cash provided by operating activities	40	87
Investing Activities
Acquisition of subsidiaries and affiliates, net of cash acquired	(572)	(47)
Additions to property, plant and equipment and other assets	(17)	(28)
Additions to intangible assets	(97)	(81)
Net cash used in investing activities	(686)	(156)
Financing Activities
Net payments under revolving credit facility		(164)
Proceeds from issuances of debt, net of issuance costs	495	496
Repayment of debt	(6)	(25)
Decrease in other short-term borrowings	(5)
Cash dividends paid to stockholders	(111)	(101)
Repurchase of common stock	(42)	(83)
Proceeds from exercise of stock options	11	18
Proceeds from employee stock purchase plan	2
Capital leases	(12)	(8)
Other financing activities	(3)	(3)
Net cash provided by financing activities	329	130
Effect of exchange-rate changes on cash and cash equivalents	14	14
Net (decrease)/increase in cash and cash equivalents	(303)	75
Cash and cash equivalents at beginning of period	754	357
Cash and cash equivalents at end of period	451	432
Supplemental Cash Flow Information
Cash paid for income taxes	(52)	(29)
Cash paid for interest, net of amounts capitalized	$ (34)	$ (29)