Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Valuation allowance for deferred tax assets	$ (1,300)
Deferred tax assets		$ 18
Deferred tax liabilities:
Net deferred tax liabilities	(47)	(10)
Reportable Legal Entities [Member]
Deferred tax assets:
Net operating loss carryforward and other credits	294	209
State net operating loss carryforward and other credits	248	20
Non-U.S. net operating losses	189
Accounts receivable basis difference	161
Partnership investments	153
Depreciation and amortization	64
Disallowed interest	51
Pension liability	49	7
Accrued liabilities for incentive compensation	32	16
Contract Revenue & Cost/Long-term contracts	17
Insurance and legal reserves	17
Other	32	2
Total deferred tax assets	1,307	254
Valuation allowance for deferred tax assets	(1,307)	(200)
Deferred tax assets		54
Deferred tax liabilities:
Investments in foreign subsidiaries	33	22
Depreciation and amortization	7	26
Long-term contracts		14
Other	7	2
Total deferred tax liabilities	47	64
Net deferred tax liabilities	$ (47)	$ (10)