Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income/(loss)	$ (403)	$ (700)	$ 440
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Share-based compensation expense	50	35	45
Deferred income tax	5	(514)	162
Currency exchange rate differences on financial transactions and other (gains)/losses	178	17	(20)
Equity in net income/(loss) of affiliates, net of dividends received	1		2
Depreciation and amortization	756	675	640
Impairment of goodwill and other long-lived assets	1,004	1,413
Changes in operating assets and liabilities, net of effect of businesses acquired and divested:
Trade and other receivables, net	4	95	10
Prepaid expenses and other assets	64	(76)	(28)
Accounts payable and other current liabilities and deferred revenues	(20)	(21)	41
Other non-current liabilities	(95)	(6)	2
Interest payable	11	14	22
Income taxes	(489)	126	(6)
Net cash provided by operating activities	1,066	1,058	1,310
Investing Activities
Acquisition of subsidiaries and affiliates, net of cash acquired	(61)	(43)	(778)
Proceeds from the sale of subsidiaries and affiliates, net	17	51	2
Additions to property, plant and equipment and other assets	(116)	(106)	(119)
Additions to intangible assets	(403)	(414)	(370)
Proceeds from the sale of property, plant and equipment and other assets		4	42
Other investing activities	(19)	2	(13)
Net cash used in by investing activities	(582)	(506)	(1,236)
Financing Activities
Proceeds from issuances of debt, net of issuance costs		781	2,745
Repayment of debt	(57)	(819)	(2,296)
Cash dividends paid to shareholders	(395)	(494)	(474)
Repurchase of common stock		(70)	(140)
Activity from share-based compensation plans	(8)	15	21
Proceeds from employee stock purchase plan	4	5	6
Finance leases	(60)	(76)	(55)
Other financing activities	(28)	(18)	(22)
Net cash used in financing activities	(544)	(676)	(215)
Effect of exchange-rate changes on cash and cash equivalents	(10)	(8)	43
Net increase/(decrease) in cash and cash equivalents	(70)	(132)	(98)
Cash and cash equivalents at beginning of period	524	656	754
Cash and cash equivalents at end of period	454	524	656
Supplemental Cash Flow Information
Cash paid for income taxes	(224)	(206)	(232)
Cash paid for interest, net of amounts capitalized	$ (386)	$ (380)	$ (352)