CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net (loss) income		$ (2,884)	$ (2,678)	$ 178
Non-cash items included in net (loss) income:
Goodwill impairment	[1]	1,430	2,168
Depreciation and amortization		267	279	101
Intangible assets impairment		162
Loss on disposal of APP		101
Debt issuance cost amortization		313	36	13
Other asset impairments		18	58	1
Stock-based compensation charges		20	44	23
Deferred taxes		12	21	7
Actuarial pension loss (gain)		6	47	(5)
Other non-cash items				(6)
Changes in operating assets and liabilities, net of effects of businesses acquired (disposed):
Accounts receivable		(205)	300	91
Contracts in progress, net of advance billings on contracts		(627)	(278)	(450)
Inventory		(24)
Accounts payable		497	(156)	105
Other current and non-current assets		(16)	63	(22)
Investments in unconsolidated affiliates		(12)	(9)	14
Other current and non-current liabilities		(34)	34	86
Total cash (used in) provided by operating activities		(976)	(71)	136
Cash flows from investing activities:
Business combinations, net of cash acquired		(7)	(2,374)
Proceeds from asset disposals, net		83	69	56
Purchases of property, plant and equipment	[2]	(92)	(86)	(119)
Advances related to proportionately consolidated consortiums		(258)	(241)
Investments in unconsolidated affiliates		(4)	(16)	(2)
Total cash used in investing activities		(278)	(2,648)	(65)
Cash flows from financing activities:
Revolving credit facility borrowings		2,451
Revolving credit facility repayments		(1,650)
Proceeds from debt		800	3,560
Repayment of debt and finance lease obligations		(39)	(545)	(235)
Proceeds from issuance of redeemable preferred stock			290
Dividends paid to holders of redeemable preferred stock			(3)
Advances related to equity method joint ventures and proportionately consolidated consortiums		237	158
Debt and letter of credit issuance costs		(160)	(217)	(21)
Redeemable preferred stock issuance costs			(18)
Debt extinguishment costs			(10)
Repurchase of common stock		(4)	(14)	(7)
Acquisition of NCI				(11)
Distributions to joint venture members		(43)		(1)
Total cash provided by (used in) financing activities		1,624	3,201	(275)
Effects of exchange rate changes on cash, cash equivalents and restricted cash		(22)	(45)
Net increase in cash, cash equivalents and restricted cash		348	437	(204)
Cash, cash equivalents and restricted cash at beginning of period		845	408	612
Cash, cash equivalents and restricted cash at end of period		1,193	845	408
Supplemental Cash Flow Information:
Cash paid for interest		283	212	50
Cash paid for income taxes, net		96	141	45
Supplemental Disclosure of Noncash Investing Activities:
Assets acquired through capital lease			72
Supplemental Disclosure of Noncash Financing Activities:
Capital lease			$ 72
Vendor equipment financing				16
Note payable in connection with noncontrolling interest distribution				$ (5)
Structured Equipment Financing [Member]
Cash flows from financing activities:
Revolving credit facility borrowings		$ 32

[1] Represents impairment of goodwill associated with our NCSA and EARC reporting units in 2019 and our NCSA, EARC, APAC and Technology reporting units in 2018. See Note 9, Goodwill and Other Intangible Assets, for further discussion. The goodwill impairment values are included within the applicable operating group’s Operating loss.

[2] Capital expenditures reported represent cash purchases. At December 31, 2019, 2018 and 2017, we had approximately $160 million, $26 million and $8 million, respectively, of accrued and unpaid capital expenditures reported in PP&E and accrued liabilities.