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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Taxes Details [Abstract]
Provision for income taxes	$ 256	$ 228	$ 490	$ 429
Effective tax rate	34.60%	32.90%	33.90%	33.20%
Expected decrease, including accrued interest, to the reserve for uncertain tax positions due to settlment of audits	$ 15		$ 15

- 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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