Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net income	$ 507	$ 575	$ 381
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	51	48	47
Deferred income tax	88	213	105
Currency exchange rate differences on financial transactions and other losses	(19)	(167)	174
Equity in net loss of affiliates, net of dividends received	2	4	5
Depreciation and amortization	603	574	573
Changes in operating assets and liabilities, net of effect of businesses acquired and divested:
Trade and other receivables, net	53	(35)	(93)
Prepaid expenses and other assets	4	(63)	(76)
Accounts payable and other current liabilities and deferred revenues	(63)	36	(4)
Other non-current liabilities	(8)	(2)	(2)
Interest payable	14	15	6
Income taxes	64	11	(23)
Net cash provided by operating activities	1,296	1,209	1,093
Investing Activities
Acquisition of subsidiaries and affiliates, net of cash acquired	(285)	(246)	(314)
Proceeds from the sale of subsidiaries and affiliates, net	34	30	(6)
Additions to property, plant and equipment and other assets	(109)	(134)	(163)
Additions to intangible assets	(324)	(274)	(249)
Proceeds from the sale of property, plant and equipment and other assets	42	7
Other investing activities		36
Net cash used in by investing activities	(642)	(581)	(732)
Financing Activities
Net (payments)/borrowings under revolving credit facility	(164)	(116)	280
Proceeds from issuances of debt, net of issuance costs	2,502	746	4,544
Repayment of debt	(1,765)	(98)	(4,598)
Increase in short term borrowings	4
Cash dividends paid to stockholders	(434)	(408)	(356)
Repurchase of common stock	(418)	(667)	(466)
Proceeds from exercise of stock options	81	72	103
Capital leases	(40)	(22)	(14)
Other financing activities	(14)	1	(78)
Net cash used in financing activities	(248)	(492)	(585)
Effect of exchange-rate changes on cash and cash equivalents	(9)	(52)	(67)
Net increase(decrease) in cash and cash equivalents	397	84	(291)
Cash and cash equivalents at beginning of period	357	273	564
Cash and cash equivalents at end of period	754	357	273
Supplemental Cash Flow Information
Cash paid for income taxes	(157)	(159)	(154)
Cash paid for interest, net of amounts capitalized	$ (319)	$ (296)	$ (294)