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Comprehensive Income - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Comprehensive Income (Loss) [Line Items] | |||
| Change in Defined benefit pension and postretirement plans, net of tax | $ 22,000,000 | $ 936,000,000 | $ 316,000,000 |
| Change in Defined benefit pension and postretirement plans, tax portion | $ 600,000,000 | ||