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Capitalization (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Schedule of Capitalization [Line Items]
Carrying Amount	$ 11,071	$ 10,673
Fair Value	12,892	12,744
Level 2 [Member]
Schedule of Capitalization [Line Items]
Fair Value	12,256
Level 3 [Member]
Schedule of Capitalization [Line Items]
Fair Value	$ 636

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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