Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Operating Activities
Net income from continuing operations	$ 112	$ 88		$ 223	$ 197
Net income/(loss) from discontinued operations				5	(85)
Gain on disposal of Global Connect, net of tax, within discontinued operations			$ 542		542	$ 489
Net income	113	78		228	654
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Share-based compensation expense				18	17
(Gain) on sale of discontinued operations, net of tax			(542)		(542)	(489)
Currency exchange rate differences on financial transactions and other (gains)/losses				(8)	37
Equity in net income of affiliates, net of dividends received				(3)
Depreciation and amortization				257	289
Changes in operating assets and liabilities, net of effect of businesses acquired and divested:
Trade and other receivables, net				4	(57)
Prepaid expenses and other assets				22	(62)
Accounts payable and other current liabilities and deferred revenues				24	(134)
Other non-current liabilities				(16)	(28)
Interest payable				(2)	(4)
Income taxes				(40)	(2)
Net cash provided by operating activities				484	168
Investing Activities
Acquisitions of subsidiaries and affiliates, net of cash acquired				(6)
Proceeds from the sale of subsidiaries and affiliates, net				1	2,279
Additions to property, plant and equipment and other assets				(26)	(22)
Additions to intangible assets				(129)	(139)
Proceeds from the sale of property, plant and equipment and other assets					3
Other investing activities				(2)	(1)
Net cash (used in)/provided by investing activities				(162)	2,120
Financing Activities
Proceeds from the issuance of debt, net of issuance costs					1,232
Repayment of debt					(3,632)
Cash dividends paid to shareholders				(43)	(43)
Payments related to tax withholding for share-based payment arrangements				(6)	(9)
Proceeds from employee stock purchase plan				1	1
Finance leases				(18)	(27)
Other financing activities				(8)	(6)
Net cash used in financing activities				(74)	(2,484)
Effect of exchange-rate changes on cash and cash equivalents				(7)	(4)
Net increase/(decrease) in cash and cash equivalents				241	(200)
Cash and cash equivalents at beginning of period			$ 610	380	610	610
Cash and cash equivalents at end of period	$ 621	$ 410		621	410	$ 380
Supplemental Cash Flow Information
Cash paid for income taxes				106	76
Cash paid for interest, net of amounts capitalized				$ 136	$ 161