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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Effective income tax rate 23.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Amortization Period for Deferred Charge 25 years    
Prepaid taxes on intercompany profit transfer $ 15ma_PrepaidTaxesforDeferredCharge   $ 18ma_PrepaidTaxesforDeferredCharge
Non-current prepaid taxes on intercompany profit transfer $ 362ma_PrepaidTaxesNoncurrent   $ 407ma_PrepaidTaxesNoncurrent