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Carrying and Estimated Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Instruments with off-balance sheet risk:
Asset derivative contracts	$ 0	$ 0
Reported Value Measurement [Member]
Carrying and estimated fair value
Long-term debt (including current maturities)	1,188	1,021
Instruments with off-balance sheet risk:
Asset derivative contracts	0	0
Estimate of Fair Value Measurement [Member]
Carrying and estimated fair value
Long-term debt (including current maturities)	1,226	1,089
Instruments with off-balance sheet risk:
Asset derivative contracts	$ 0	$ 0

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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