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Income Taxes - Domestic and Foreign Components of Income Before Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income before income taxes, Domestic	$ 1,415nov_IncomeBeforeIncomeTaxesDomestic	$ 1,362nov_IncomeBeforeIncomeTaxesDomestic	$ 1,697nov_IncomeBeforeIncomeTaxesDomestic
Income before income taxes, Foreign	2,079nov_IncomeBeforeIncomeTaxesForeign	1,762nov_IncomeBeforeIncomeTaxesForeign	1,643nov_IncomeBeforeIncomeTaxesForeign
Income before income taxes	$ 3,494nov_IncomeBeforeIncomeTaxes	$ 3,124nov_IncomeBeforeIncomeTaxes	$ 3,340nov_IncomeBeforeIncomeTaxes