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Employee Severance and Termination Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Employees	Dec. 31, 2013 Employees	Dec. 31, 2012 Employees
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	$ 30us-gaap_SeveranceCosts1	$ 29us-gaap_SeveranceCosts1	$ 23us-gaap_SeveranceCosts1
Number of employees terminated	2,000lll_NumberOfEmployeeTerminated	2,000lll_NumberOfEmployeeTerminated	1,600lll_NumberOfEmployeeTerminated
Remaining balance of employee termination costs	11
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Payments for employee termination costs	$ 11

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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