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Capitalization (Fair Value Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Capitalization [Abstract]
Long-Term, Carrying amount	$ 10,673	$ 10,676
Long-Term, Fair Value	$ 12,744	$ 11,761

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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