Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net income	$ 206	$ 215
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	27	26
Currency exchange rate differences on financial transactions and other (gains)/losses	(17)	6
Equity in net income of affiliates, net of dividends received	2	2
Depreciation and amortization	317	299
Changes in operating assets and liabilities, net of effect of businesses acquired and divested:
Trade and other receivables, net	(119)	(63)
Prepaid expenses and other assets	(41)	(44)
Accounts payable and other current liabilities and deferred revenues	(134)	(200)
Other non-current liabilities	(5)	(7)
Interest payable	18	5
Income taxes	12	58
Net cash provided by operating activities	266	297
Investing Activities
Acquisition of subsidiaries and affiliates, net of cash acquired	(581)	(252)
Additions to property, plant and equipment and other assets	(31)	(55)
Additions to intangible assets	(175)	(166)
Proceeds from the sale of property, plant and equipment and other assets	28
Other investing activities	(1)	1
Net cash used in investing activities	(760)	(472)
Financing Activities
Net borrowings under revolving credit facility	101	221
Proceeds from issuances of debt, net of issuance costs	2,745	496
Repayment of debt	(2,282)	(56)
Decrease in other short-term borrowings	(5)
Cash dividends paid to stockholders	(232)	(212)
Repurchase of common stock	(84)	(304)
Proceeds from exercise of stock options	16	29
Proceeds from employee stock purchase plan	3
Capital leases	(31)	(18)
Other financing activities	(8)	(5)
Net cash provided by financing activities	223	151
Effect of exchange-rate changes on cash and cash equivalents	27	13
Net decrease in cash and cash equivalents	(244)	(11)
Cash and cash equivalents at beginning of period	754	357
Cash and cash equivalents at end of period	510	346
Supplemental Cash Flow Information
Cash paid for income taxes	(122)	(68)
Cash paid for interest, net of amounts capitalized	$ (164)	$ (157)