Income Taxes (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Reserves not yet deducted for tax purposes	$ 3,926,000,000	$ 3,813,000,000
Employee compensation and benefits	789,000,000	721,000,000
Other	266,000,000us-gaap_DeferredTaxAssetsOther	546,000,000us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets	4,981,000,000us-gaap_DeferredTaxAssetsGross	5,080,000,000us-gaap_DeferredTaxAssetsGross
Valuation allowance	(75,000,000)	(121,000,000)
Deferred tax assets after valuation allowance	4,906,000,000us-gaap_DeferredTaxAssetsNet	4,959,000,000us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Intangibles and fixed assets	1,597,000,000	1,465,000,000
Deferred revenue	498,000,000	453,000,000
Deferred interest	350,000,000	363,000,000
Asset Securitization	162,000,000	130,000,000
Investment in joint ventures	223,000,000	10,000,000
Foreign deferred tax liabilities	62,000,000us-gaap_DeferredTaxLiabilitiesOther	95,000,000us-gaap_DeferredTaxLiabilitiesOther
Gross deferred tax liabilities	2,892,000,000us-gaap_DeferredTaxLiabilities	2,516,000,000us-gaap_DeferredTaxLiabilities
Net deferred tax assets	$ 2,014,000,000us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 2,443,000,000us-gaap_DeferredTaxAssetsLiabilitiesNet

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of deferred tax liability attributable to taxable temporary differences from tax deferred revenue or other income not separately disclosed.

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