Income Taxes (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets
Deferred and refundable income taxes	$ 94us-gaap_DeferredTaxAssetsNet	$ 103us-gaap_DeferredTaxAssetsNet	$ 104us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities
Deferred income taxes and other liabilities	(668)us-gaap_DeferredTaxLiabilities	(500)us-gaap_DeferredTaxLiabilities	(535)us-gaap_DeferredTaxLiabilities
Deferred income taxes, net	$ (574)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (397)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (431)us-gaap_DeferredTaxAssetsLiabilitiesNet

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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