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Summary of Significant Accounting and Reporting Policies - Narrative (Details)
$ in Millions, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 29, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
CAD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
solar_generation_facility
wind_generation_facility
MW
Sep. 30, 2019
USD ($)
pipeline
Sep. 30, 2018
USD ($)
solar_generation_facility
wind_generation_facility
MW
Dec. 31, 2018
USD ($)
Property, Plant and Equipment [Line Items]                
Restricted cash, current       $ 4   $ 4   $ 8
Restricted cash, noncurrent       11   11   $ 11
Proceeds from the sale of Canadian Holdings - net           0 $ 517 [1]  
Gain on disposal of Canadian Holdings       0 $ 0 [2] 0 153 [1],[2]  
Income before income taxes       $ (261) 125 [2] $ (523) 396 [2]  
Canadian Holdings [Member]                
Property, Plant and Equipment [Line Items]                
Income before income taxes             47  
Non Affiliated Party [Member]                
Property, Plant and Equipment [Line Items]                
Noncontrolling ownership interest       10.00%   10.00%    
Number Of Pipelines | pipeline           1    
NEP OpCo [Member]                
Property, Plant and Equipment [Line Items]                
Noncontrolling ownership interest       62.50%   62.50%    
Silver State [Member]                
Property, Plant and Equipment [Line Items]                
Noncontrolling ownership interest       50.00%   50.00%    
Canadian Holdings [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                
Property, Plant and Equipment [Line Items]                
Proceeds from the sale of Canadian Holdings - net $ 563   $ 740          
Post-closing working capital adjustments   $ 1            
Assumption of existing debt         $ 676   $ 676  
Number of wind generation facilities | wind_generation_facility         4   4  
Number of solar generation facilities | solar_generation_facility         2   2  
Generation facility capacity (mw) | MW         396   396  
Gain on disposal of Canadian Holdings   153            
Gain on disposal of Canadian Holdings, after tax   $ 201            
[1]
Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.
[2]
Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.