Revenues - Additional Information (Detail) - USD ($)		3 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Revenue From Contract With Customer [Line Items]
Transaction price allocated to remaining performance obligations	$ 2,800,000,000	$ 2,800,000,000
Remaining revenue performance obligation, percentage of revenue expected to be recognized in 2018	25.00%
Remaining revenue performance obligation, percentage of revenue expected to be recognized in 2019	27.00%
Net trade accounts receivable	$ 1,700,000,000	1,700,000,000	$ 1,700,000,000
Contract assets	68,000,000	68,000,000	73,000,000
Contract liabilities	0	0	$ 0
Accounts and Other Current Receivables, Net
Revenue From Contract With Customer [Line Items]
Contract assets	41,000,000	41,000,000
Other
Revenue From Contract With Customer [Line Items]
Contract assets	$ 27,000,000	$ 27,000,000
Minimum
Revenue From Contract With Customer [Line Items]
Remaining performance obligations period		1 year
Maximum
Revenue From Contract With Customer [Line Items]
Remaining performance obligations period		1 year
Amortization period for cost incurred to obtain contract		1 year
Contract with customer period for goods or service transfers and customer pays for goods or service		1 year