Reorganization - Schedule of Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 1,177	$ 790
Restricted cash and cash equivalents	397	393
Current assets of discontinued operations held for sale	2,451	306
Other current assets	192	210
Total current assets	6,241	3,555
Property, plant and equipment, net	1,224	2,066
Other non-current assets	175	171
Total assets	8,300	8,737
Current liabilities:
Debt	2,038	5,107
Current liabilities of discontinued operations held for sale	426	383
Total current liabilities	5,885	9,444
Other non-current liabilities	804	717
Total liabilities not subject to compromise	7,023	10,590
Liabilities subject to compromise	4,578
Mezzanine equity: Redeemable preferred stock	294	290
Debtor entities total McDermott stockholders' equity	(3,602)	(2,143)
Noncontrolling interest	7
Total stockholders' equity	(3,595)	(2,143)	$ 675	$ 823
Total liabilities and stockholders' equity	8,300	$ 8,737
Debtor in Possession [Member]
Current assets:
Cash and cash equivalents	990
Restricted cash and cash equivalents	397
Current assets of discontinued operations held for sale	2,451
Other current assets	2,015
Total current assets	5,853
Property, plant and equipment, net	1,171
Other non-current assets	1,695
Total assets	8,719
Current liabilities:
Debt	2,038
Current liabilities of discontinued operations held for sale	426
Advance billings on contracts, accounts payable, accrued and other current liabilities	3,149
Total current liabilities	5,613
Intercompany accounts payable	727
Other non-current liabilities	1,051
Total liabilities not subject to compromise	7,391
Liabilities subject to compromise	4,578
Mezzanine equity: Redeemable preferred stock	294
Debtor entities total McDermott stockholders' equity	(3,551)
Noncontrolling interest	7
Total stockholders' equity	(3,544)
Total liabilities and stockholders' equity	$ 8,719