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Derivative Instruments - Derivatives and Hedges (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
MMBTU
Jun. 30, 2015
USD ($)
MMBTU
Jun. 30, 2016
USD ($)
MMBTU
Jun. 30, 2015
USD ($)
MMBTU
Commodity forward contracts | Cash Flow Hedges        
Derivatives and Hedges        
Coverage of commodity forward contracts (in MM BTUs) | MMBTU 11,300,000 5,900,000 11,300,000 5,900,000
Unrecognized (loss) gain included in Accumulated OCI $ 3 $ (1) $ 3 $ (1)
Commodity forward contracts gain (loss) recognized in OCI 7   3  
Commodity forward contracts gain (loss) reclassified from accumulated OCI into income (2) 2   2
Foreign exchange derivative contracts | Derivatives not designated as hedging instruments | Other Expenses.        
Derivatives and Hedges        
Foreign exchange contracts gain (loss) recognized in income (1) (5) 4 6
Forward exchange contracts | Derivatives not designated as hedging instruments        
Derivatives and Hedges        
Foreign exchange contracts in various currencies $ 524 $ 606 $ 524 $ 606