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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax And Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 294	$ 253
Deferred Tax Assets, Valuation Allowance	970	740
Undistributed Earnings of Foreign Subsidiaries	118
Deferred Tax Assets, Investments	13
Tax benefit due to IRS settlements	80
Interest and penalties accrued for unrecognized tax benefits, current period	(62)	(10)	(8)
Interest and penalties accrued for unrecognized tax benefits, total	1	63	73
Unrecognized tax benefits that would impact the effective tax rate	48	91	219
General Business Tax Credit Carryforward [Member]
Income Tax And Carryforwards [Line Items]
Operating loss carryforward, amount to expire	39
State [Member]
Income Tax And Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	17
Foreign Tax Authority [Member]
Income Tax And Carryforwards [Line Items]
Operating loss carryforward, amount to expire	2
Deferred Tax Assets, Valuation Allowance	2
Foreign Tax Authority [Member]
Income Tax And Carryforwards [Line Items]
Operating loss carryforward	110	119
Tax Credit Carryforward, Amount	14	7
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	12
Federal [Member]
Income Tax And Carryforwards [Line Items]
Operating loss carryforward	4,200	3,700
Federal [Member] \| Capital Loss Carryforward [Member]
Income Tax And Carryforwards [Line Items]
Operating loss carryforward, amount to expire	364
State [Member]
Income Tax And Carryforwards [Line Items]
Operating loss carryforward	$ 8,200	$ 6,500