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Long-Term Debt (Details Textuals) (USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended		0 Months Ended
	Apr. 12, 2010	Jun. 30, 2011	Dec. 31, 2010	Jun. 23, 2009 2019 Notes [Member]	Apr. 12, 2010 2020 Notes [Member]	Apr. 12, 2010 2040 Notes [Member]
Long-Term Debt (Textuals) [Abstract]
Issuance of unsecured senior notes	$ 1,000			$ 750	$ 750	$ 250
Unsecured senior debt stated interest rate in %				8.125%	6.875%	8.125%
Minimum Incremental Increase in Interest rate on the Notes				0.25%
Maximum Incremental Increase in Interest rate on the Notes				2.00%
Offer to repurchase the Notes upon control triggering Event		101.00%
Number of days ceased to be rated investment grade for becoming change of control triggering event		60 days
Carrying value of the notes		1,780	1,769
Estimated fair value of the notes		$ 1,978	$ 1,865

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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