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Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Other layoff cost including reclassification in pension cost	$ 246us-gaap_OtherRestructuringCosts	$ 185us-gaap_OtherRestructuringCosts	$ 26us-gaap_OtherRestructuringCosts
Restructuring and other charges	1,168us-gaap_RestructuringCharges	782us-gaap_RestructuringCharges	172us-gaap_RestructuringCharges
Pension Costs [Member]
Restructuring Cost and Reserve [Line Items]
Other layoff cost including reclassification in pension cost	26	92
Asset Retirement Obligations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	95	58
Environmental Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 47	$ 12

- Definition

Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

+ References+ Details

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details