Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net income from continuing operations	$ 317	$ 194
Net loss from discontinued operations	(94)	(223)
Gain on disposal of Global Connect, net of tax, within discontinued operations	534
Net income/(loss)	757	(29)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Share-based compensation expense	27	44
Gain on sale of discontinued operations, net of tax	(534)
Currency exchange rate differences on financial transactions and other losses	39	11
Equity in net loss of affiliates, net of dividends received		1
Depreciation and amortization	418	655
Impairment of other long-lived assets		53
Changes in operating assets and liabilities, net of effect of businesses acquired and divested:
Trade and other receivables, net	(131)	11
Prepaid expenses and other assets	(33)	137
Accounts payable and other current liabilities and deferred revenues	(112)	(129)
Other non-current liabilities	(35)	(37)
Interest payable	32	31
Income taxes	11	(86)
Net cash provided by operating activities	439	662
Investing Activities
Acquisition of subsidiaries and affiliates, net of cash acquired	(13)	(29)
Proceeds from the sale of subsidiaries and affiliates, net	2,269	13
Additions to property, plant and equipment and other assets	(41)	(26)
Additions to intangible assets	(197)	(319)
Proceeds from the sale of property, plant, equipment and other assets	3
Other investing activities		(4)
Net cash provided by/(used in) investing activities	2,021	(365)
Financing Activities
Proceeds from issuances of debt, net of issuance costs	1,231	2,974
Repayment of debt	(3,632)	(1,319)
Cash dividends paid to shareholders	(65)	(64)
Activity from share-based compensation plans	(10)	(6)
Proceeds from employee stock purchase plan	1	3
Finance leases	(34)	(43)
Other financing activities	(10)	(29)
Net cash (used in)/provided by financing activities	(2,519)	1,516
Effect of exchange-rate changes on cash and cash equivalents	(9)	(17)
Net decrease in cash and cash equivalents	(68)	1,796
Cash and cash equivalents at beginning of period	610	454
Cash and cash equivalents at end of period	542	2,250
Supplemental Cash Flow Information
Cash paid for income taxes	96	128
Cash paid for interest, net of amounts capitalized	$ 193	$ 246