Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income (loss)	$ 98	$ (78)	$ 564
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Loss from discontinued operations	0	72	50
Gain (Loss) on Extinguishment of Debt	42	20	0
Depreciation and amortization	517	364	333
Stock-based compensation expense	154	108	107
Deferred income taxes	89	(112)	(355)
Asset Impairment Charges	24	46	2
Gain (loss) on disposal of property, plant and equipment	0	(1)	(6)
Business Combination, Bargain Purchase, Gain Recognized, Amount	0	(7)	0
Changes in assets and liabilities:
Receivables	215	420	(144)
Inventories	(195)	168	5
Current payables and accrued expenses	255	(295)	(20)
Contract liabilities	(15)	2	31
Employee benefit plans	(147)	(51)	59
Other assets and liabilities	40	(15)	8
Net Cash Provided by (Used in) Operating Activities	1,077	641	634
Investing activities
Expenditures for property, plant and equipment	(106)	(31)	(91)
Proceeds from Sale of property, plant, and equipment	1	7	11
Additions to capitalized software	(242)	(232)	(238)
Business acquisitions, net of cash acquired	(2,473)	(25)	(203)
Net change in funds held for clients - investing	(13)	(20)	0
Proceeds from Sale, Maturity and Collection of Investments	14	27	0
Other investing activities, net	(7)	(3)	9
Net Cash Provided by (Used in) Investing Activities	(2,826)	(277)	(512)
Financing activities
Repayments of Unsecured Debt	(400)	(1,300)	(900)
Payments on term credit facilities	(107)	(12)	(761)
Payments on revolving credit facilities	(1,650)	(1,998)	(3,216)
Proceeds from Issuance of Secured Debt	1,505	4	750
Borrowings on revolving credit facilities	1,756	1,535	3,535
Proceeds from Issuance of Unsecured Debt	1,200	1,500	1,000
Debt issuance costs and bridge commitment fees	(53)	(21)	(32)
Payment for Debt Extinguishment or Debt Prepayment Cost	(37)	(15)	0
Series A Convertible Preferred Stock cash payments	(15)	(9)	0
Repurchase of company common stock	0	(41)	(96)
Tax withholding payments on behalf of employees	(50)	(28)	(29)
Proceeds from employee stock plans	44	17	16
Increase (Decrease) in Client Funds Held	4	12	(15)
Repurchase of Series A Convertible Preferred Stock	0	(144)	(302)
Finance Lease, Principal Payments	(17)	(13)	(4)
Payments for Repurchase of Redeemable Noncontrolling Interest	0	0	(3)
Other financing activities	(2)	(1)	(4)
Net Cash Provided by (Used in) Financing Activities	2,178	(514)	(61)
Cash flows from discontinued operations
Net cash provided by (used in) discontinued operations	(68)	0	(24)
Effect of Exchange Rate changes on cash and cash equivalents	(18)	(7)	(6)
Decrease in cash, cash equivalents, and restricted cash	343	(157)	31
Cash, Cash Equivalents, Restricted Cash and Restricted Cash at beginning of period	406	563	532
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	749	406	563
Income Taxes Paid, Net	84	82	61
Interest Paid, Excluding Capitalized Interest, Operating Activities	$ 215	$ 196	$ 168