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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:              
Net income (loss) $ 19 $ (8) $ 27 $ (194) $ 32 $ (131)  
Adjustments to reconcile net income (loss) to net cash provided by operating activities:              
Depreciation 20   21   59 62  
Amortization 32   31   95 134  
Impairment of goodwill and intangible assets         197  
Deferred taxes         (1) (49)  
Share-based compensation expense         8 4  
Profit-sharing expense         11 6  
Non-cash lease expense         24 22  
Loss on extinguishment of debt         9  
Other, net         5 3  
Changes in operating assets and liabilities, net of effects of business acquisitions:              
Accounts receivable         (76) 93  
Contract assets         (81) (27)  
Inventories         (5) 1  
Prepaid expenses and other current assets         (11) (19)  
Accounts payable         54 (14)  
Accrued liabilities and income taxes payable         (11) 46  
Contract liabilities         16 57  
Other assets and liabilities         (60) (56)  
Net cash provided by operating activities         68 329  
Cash flows from investing activities:              
Acquisitions, net of cash acquired         (51) (6)  
Purchases of property and equipment         (43) (24)  
Proceeds from sales of property, equipment, held for sale assets, and businesses         13 13  
Net cash used in investing activities         (81) (17)  
Cash flows from financing activities:              
Proceeds from long-term borrowings         350 2  
Payments on long-term borrowings         (320) (16)  
Payments of debt issuance costs         (4)  
Proceeds from share issuance and warrant exercises         676 3  
Payments of acquisition-related consideration         (72) (90)  
Restricted shares tendered for taxes         (1)  
Net cash provided by (used in) financing activities         629 (101)  
Effect of foreign currency exchange rate change on cash and cash equivalents         (1)  
Net increase in cash and cash equivalents         615 211  
Cash, cash equivalents, and restricted cash, beginning of period   $ 515   $ 256 515 256 $ 256
Cash, cash equivalents, and restricted cash, end of period $ 1,130   $ 467   1,130 467 $ 515
Supplemental cash flow disclosures:              
Cash paid for interest         32 37  
Cash paid for income taxes, net of refunds         55 19  
Accrued consideration issued in business combinations         13 5  
Shares issued to profit sharing plan         $ 13