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Income Taxes - Deferred income taxes (assets and liabilities netted by jurisdiction) as classified in the Consolidated Statements of Financial Position (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income taxes    
Deferred tax assets - current $ 212us-gaap_DeferredTaxAssetsNetCurrent [1] $ 93us-gaap_DeferredTaxAssetsNetCurrent [1]
Deferred tax assets — non-current 144us-gaap_DeferredTaxAssetsNetNoncurrent 193us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred tax liabilities - current (2)us-gaap_DeferredTaxLiabilitiesCurrent [1] (48)us-gaap_DeferredTaxLiabilitiesCurrent [1]
Deferred tax liabilities — non-current (313)us-gaap_DeferredTaxLiabilitiesNoncurrent (420)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax asset (liability) $ 41us-gaap_DeferredTaxAssetsLiabilitiesNet $ (182)us-gaap_DeferredTaxAssetsLiabilitiesNet
[1] Included in Other current assets and Other current liabilities.