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Financial Instruments, Excluding Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial Instruments Excluding Derivative Financial Instruments Disclosure [Abstract]
Long-term debt (excluding capital lease obligations), carrying values	$ 3,936	$ 3,617
Long-term debt (excluding capital lease obligations), fair values	$ 4,535	$ 4,154

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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