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Tax - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Effective tax rate	30.90%	30.80%
U.S. federal statutory rate	35.00%
Unrecognized tax benefit	$ 128
Decrease in balance of unrecognized tax benefits associated with reduction in tax	55
Material changes in unrecognized tax benefits	$ 0

X

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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-Name Regulation S-X (SX)

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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-Publisher FASB

-Name Accounting Standards Codification

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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