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Carrying and Estimated Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Instruments with off-balance sheet risk:
Asset derivative contracts	$ 0	$ 1
Carrying Amount [Member]
Carrying and estimated fair value
Long-term debt (including current maturities)	1,160	1,070
Instruments with off-balance sheet risk:
Asset derivative contracts	0	1
Fair Value [Member]
Carrying and estimated fair value
Long-term debt (including current maturities)	1,217	1,136
Instruments with off-balance sheet risk:
Asset derivative contracts	$ 0	$ 1

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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