Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net income	$ 249	$ 356
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	21	35
Currency exchange rate differences on financial transactions and other losses/(gains)	11	(25)
Equity in net loss of affiliates, net of dividends received	2	2
Depreciation and amortization	504	477
Changes in operating assets and liabilities, net of effect of businesses acquired and divested:
Trade and other receivables, net	(48)	(15)
Prepaid expenses and other assets	(70)	(8)
Accounts payable and other current liabilities and deferred revenues	(190)	(123)
Other non-current liabilities	(6)	(9)
Interest payable	53	63
Income taxes	(14)	51
Net cash provided by operating activities	512	804
Investing Activities
Acquisition of subsidiaries and affiliates, net of cash acquired	(39)	(595)
Additions to property, plant and equipment and other assets	(66)	(55)
Additions to intangible assets	(305)	(264)
Proceeds from the sale of property, plant and equipment and other assets	4	28
Other investing activities	3	(2)
Net cash used in investing activities	(403)	(888)
Financing Activities
Net borrowings under revolving credit facility	204
Proceeds from issuances of debt, net of issuance costs	781	2,745
Repayment of debt	(805)	(2,289)
Increase/(decrease) in other short-term borrowings	1	(5)
Cash dividends paid to stockholders	(370)	(353)
Repurchase of common stock	(70)	(117)
Proceeds from issuance of common stock	17	21
Proceeds from employee stock purchase plan	4	5
Capital leases	(60)	(42)
Other financing activities	(15)	(13)
Net cash used in financing activities	(313)	(48)
Effect of exchange-rate changes on cash and cash equivalents	(6)	40
Net decrease in cash and cash equivalents	(210)	(92)
Cash and cash equivalents at beginning of period	656	754
Cash and cash equivalents at end of period	446	662
Supplemental Cash Flow Information
Cash paid for income taxes	(156)	(175)
Cash paid for interest, net of amounts capitalized	$ (242)	$ (214)