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Accounting Policies (Details) (USD $)	3 Months Ended		9 Months Ended
Accounting Policies (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value of Financial Instruments
Minimum initial maturities of short-term investments (in months)			3 months
Total long-term debt	$ 9,400,000,000		$ 9,400,000,000
Estimated fair value of long-term debt	10,300,000,000		10,300,000,000
Related Party Transactions
Related Party Transaction, Amounts of Transaction	$ 12,000,000	$ 8,000,000	$ 35,000,000	$ 26,000,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

Amount of transactions with related party during the financial reporting period.

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