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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Taxes [Line Items]
Effective income tax rate	24.00%	18.00%
Income tax benefit	$ 89	$ 44
Tax benefit for retroactive impact of U.S. tax law changes	10
Environmental Remediation Expense [Member]
Income Taxes [Line Items]
Income tax benefit		4
Business Restructuring Reserves [Member]
Income Taxes [Line Items]
Income tax benefit		5
Acquisition-related Costs [Member]
Income Taxes [Line Items]
Income tax benefit	$ 1	$ 1

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to changes in the income tax rates under enacted tax laws in the period.

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