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Financial Instruments, Excluding Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial Instruments Excluding Derivative Financial Instruments Disclosure [Abstract]
Long-term debt (excluding capital lease obligations), carrying values	$ 3,324	$ 3,939
Long-term debt (excluding capital lease obligations), fair values	$ 3,865	$ 4,484

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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