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Tax Matters - Deferred Taxes (Parenthetical) (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Taxes and other current assets	$ 3,600,000,000	$ 4,000,000,000
Taxes and other noncurrent assets	700,000,000	1,200,000,000
Other current liabilities	11,000,000	350,000,000
Noncurrent deferred tax liabilities	$ 21,593,000,000	$ 18,861,000,000

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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