Intangible Assets - Schedule of Other Intangible Assets (Detail) - Other Intangible Assets [Member] $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,049	[1]
Accumulated amortization	(10)	[1]
Process Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	515
Accumulated amortization	$ (3)
Weighted average life	27 years
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 420
Accumulated amortization	$ (6)
Weighted average life	12 years
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 87
Accumulated amortization	$ (1)
Weighted average life	9 years
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 27
Weighted average life	10 years

[1] All other intangible assets at June 30, 2018 resulted from the Combination. Amortization expense was $10 million for the three months ended June 30, 2018 and is anticipated to be $45 million, $81 million, $81 million, $77 million and $73 million for the remainder of 2018, 2019, 2020, 2021 and 2022, respectively.