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Commitments and Contingencies - Commitments (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
project
Operating Leased Assets [Line Items]  
Payments for acquisition holdback $ 200
Genesis [Member] | Surety Bond [Member]  
Operating Leased Assets [Line Items]  
Surety bond $ 23
Minimum Required Domestic Content Level [Member]  
Operating Leased Assets [Line Items]  
Number of projects | project 2
Minimum MRDCL for two projects (as a percent) 25.00%
Minimum MRDCL for two Canadian FIT contracts (as a percent) 50.00%
MRDCL supply period 7 years