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Commitments and Contingencies Level 4 - (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Document Period End Date Jun. 30, 2015  
Recognized obligations $ 13 $ 13
Non-environmental legal accrual 4 $ 5
Waterford, NY site [Domain]    
Loss Contingencies [Line Items]    
Accrual for Environmental Loss Contingencies $ 8  
Accrual for Environmental Loss Contingencies, Discount Rate 3.00%  
Accrual for Environmental Loss Contingencies, Payment Period 49 years  
Site Contingency, Accrual, Undiscounted Amount $ 17  
Accrual for Environmental Loss Contingencies, Undiscounted, Due in Next Five Years $ 2