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Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Asset Derivatives    
Derivatives, Fair Value [Line Items]    
Derivatives designated as hedging instruments - assets $ 4 $ 3
Derivatives not designated as hedging instruments - assets 97 139
Liability Derivatives    
Derivatives, Fair Value [Line Items]    
Derivatives designated as hedging instruments - liabilities 428 248
Derivatives not designated as hedging instruments - liabilities $ 105 $ 71