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Financing Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]            
Financing receivable $ 119   $ 119     $ 194
Argentina [Member]            
Financing Receivable Recorded Investment [Line Items]            
Financing receivable 83   83     177
Other Entity [Member]            
Financing Receivable Recorded Investment [Line Items]            
Financing receivable 9   9     17
PANAMA            
Financing Receivable Recorded Investment [Line Items]            
Financing receivable 27   27     $ 0
Fluence [Member]            
Financing Receivable Recorded Investment [Line Items]            
Business Acquisition, Percentage of Voting Interests Acquired         50.00%  
Other Expense [Member]            
Financing Receivable Recorded Investment [Line Items]            
Allowance for other receivables $ 0 $ 15 $ 0 $ 15