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Long-Term Debt (Components Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 13,878	$ 13,689
Less current portion of long-term debt	1,459	600
Long-term debt excluding current portion	12,419	13,089
Notes, 4.125% to 10.20%, Due Through 2039 [Member]
Debt Instrument [Line Items]
Long-term debt	13,836	13,647
Debenture, 7.75% Due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 42	$ 42

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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