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New Accounting Pronouncements (Details) - New Accounting Pronouncement, Early Adoption, Effect - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Decrease in deferred tax asset   $ 75
Decrease in deferred tax liability   2
Assets | Pro Forma    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt issuance cost $ (74) (73)
Liability | Pro Forma    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Debt issuance cost $ (36) $ (35)