Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
United States	$ 173	$ 594	$ 605
International	3,358	2,872	2,479
Income before income taxes	3,531	3,466	3,084
Current
Federal	492us-gaap_CurrentFederalTaxExpenseBenefit	455us-gaap_CurrentFederalTaxExpenseBenefit	327us-gaap_CurrentFederalTaxExpenseBenefit
State and local	20	(4)	63
Foreign	165us-gaap_CurrentForeignTaxExpenseBenefit	190us-gaap_CurrentForeignTaxExpenseBenefit	120us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax expense (benefit)	677us-gaap_CurrentIncomeTaxExpenseBenefit	641us-gaap_CurrentIncomeTaxExpenseBenefit	510us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
Federal	2,808	18	34
State and local	14	(22)	(24)
Foreign	(14)	(27)	(45)
Deferred income tax expense (benefit)	2,808us-gaap_DeferredIncomeTaxExpenseBenefit	(31)us-gaap_DeferredIncomeTaxExpenseBenefit	(35)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit)	$ 3,485us-gaap_IncomeTaxExpenseBenefit	$ 610us-gaap_IncomeTaxExpenseBenefit	$ 475us-gaap_IncomeTaxExpenseBenefit
Federal statutory rate	35.00%	35.00%	35.00%

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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