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Commitments and Contingencies (Environmental) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Site Contingency [Line Items]    
Accruals for environmental remediation, dismantling, and decontamination $ 14 $ 14
Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]    
Site Contingency [Line Items]    
Accruals for environmental remediation, dismantling, and decontamination 8 7
Accruals for environmental remediation, dismantling, and decontamination, undiscounted 11 10
Former TEL Plant Site, Louisiana [Member]    
Site Contingency [Line Items]    
Accrual for remediation of groundwater and soil 4 3
Houston, Texas Plant Site [Member]    
Site Contingency [Line Items]    
Accrual for remediation of groundwater and soil $ 4 $ 4
Minimum [Member] | Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]    
Site Contingency [Line Items]    
Discount rate 3.00% 4.00%
Maximum [Member] | Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]    
Site Contingency [Line Items]    
Discount rate 9.00% 9.00%