Fair Value Measurements (Details 1) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Debt Instruments [Abstract]
Long-term Debt, Gross	$ 14,543	$ 15,442
Debt Instrument, Unamortized Discount (Premium), Net	(793)	(935)
Net carrying amount	13,750	14,507
Debt Instrument, Fair Value Disclosure	$ 14,200	$ 15,400

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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