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Acquisitions Acquistions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 01, 2018
Business Acquisition [Line Items]                
Project Financing Disbursed         $ 0 $ 0 $ 119  
Other Income [Member]                
Business Acquisition [Line Items]                
Liquidation Basis of Accounting, Remeasurement, Gain (Loss) on Asset         0 0    
Distributed Energy [Member]                
Business Acquisition [Line Items]                
Payments to Acquire Businesses, Net of Cash Acquired             $ 23  
Business Combination, Ownership Percentage in Acquiree     100.00%       100.00%  
Business Combination, Equity Interest in Acquiree, Remeasurement Gain (Loss)     $ 5          
Na Pua Makani Power Partners [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired               100.00%
Business Combination, Consideration Transferred     11       $ 53  
Business Combination, Contingent Consideration     $ 5       48  
Na Pua Makani Power Partners [Member] | Other Income [Member]                
Business Acquisition [Line Items]                
Liquidation Basis of Accounting, Remeasurement, Gain (Loss) on Asset [1]             32  
Guaimbe Solar Complex [Member]                
Business Acquisition [Line Items]                
Project Financing Disbursed             $ 119  
Asset acquisition, additional cash paid       $ 33        
Asset Acquisition, Consideration Transferred       $ 152        
Los Cururos [Member]                
Business Acquisition [Line Items]                
Payments to Acquire Businesses, Gross   $ 5            
Asset Acquisition, Consideration Transferred           $ 143    
Penonome Wind [Member]                
Business Acquisition [Line Items]                
Asset Acquisition, Purchase Price         80      
Ventus Wind Complex [Member]                
Business Acquisition [Line Items]                
Business Combination, Consideration Transferred         91      
Payments to Acquire Businesses, Gross         $ 44      
Other Payments to Acquire Businesses $ 4              
[1] Related to the amendment of the Oahu purchase agreement. See Note 26—Acquisitions for further information.