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Restructuring Restructuring and Cost Reduction Programs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]            
Accelerated depreciation $ 14 $ 21 $ 14 $ 127    
Restructuring Reserve 3   3     $ 31
Restructuring Reserve, Period Increase (Decrease)     (28)      
Payments for Restructuring     23      
RestructuringReserveIncludedInAccountsPayable 5   5      
Asset Retirement Obligation         $ 30  
Norco [Member]            
Restructuring Cost and Reserve [Line Items]            
Norco Restructuring and Related Cost, Accelerated Depreciation       76    
Loss on Contract Termination 0     30    
Restructuring and Related Cost, Incurred Cost $ 1   $ 23 $ 3