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Income Taxes (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Tax Expense (Benefits) [Line Items]
Federal and foreign income tax expense (benefit)	$ 236	$ 235	$ 733	$ 765
Effective tax rate on earnings from continuing operations	34.00%	31.10%	33.70%	33.20%
Research and Development Tax Credits and Manufacturing Deductions [Member]
Income Tax Expense (Benefits) [Line Items]
Federal and foreign income tax expense (benefit)		$ (14)

- Definition

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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