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Summary of Significant Accounting and Reporting Policies - Noncontrolling Interests (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Apr. 01, 2018
Jan. 01, 2018
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                    
Balances, beginning of period     $ 3,192,000,000 $ 0     $ 3,192,000,000      
Sale of Class B noncontrolling interest - net   $ 893,000,000                
Acquisition of subsidiaries with noncontrolling ownership interest $ 11,000,000 472,000,000                
Related party note receivable   1,000,000     $ 2,000,000 [1] $ 29,000,000 [1]        
Net income (loss) attributable to NCI (173,000,000)     71,000,000 [2]     (380,000,000) $ 176,000,000 [2]    
Related party contributions   11,000,000 1,000,000 1,000,000            
Related party distributions (71,000,000) (56,000,000) (51,000,000) (48,000,000) (41,000,000) [1] (64,000,000) [1]        
Changes in non-economic ownership interests (6,000,000)   (6,000,000) (1,000,000) [1] 1,000,000 [1] (6,000,000) [1]        
Payments to Class B noncontrolling interests investors (7,000,000) (3,000,000) (5,000,000)              
Adoption of accounting standards update [1]                 $ 0 $ 1,423,000,000
Other 0 1,000,000 1,000,000              
Balances, end of period 4,016,000,000       0   4,016,000,000      
Net income (loss) attributable to NCI (173,000,000)     71,000,000 [2]     (380,000,000) 176,000,000 [2]    
Net loss attributable to NEP – basic 72,000,000     (33,000,000) [2]     122,000,000 (189,000,000) [2]    
Accounting Standards Update 2017-05 [Member]                    
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                    
Income (loss) attributable to noncontrolling interest, before tax               231,000,000    
Noncontrolling Ownership Interests In NEP OpCo Subsidiary [Member]                    
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                    
Balances, beginning of period 1,673,000,000 758,000,000 751,000,000       751,000,000      
Sale of Class B noncontrolling interest - net   893,000,000                
Net income (loss) attributable to NCI 34,000,000 25,000,000 12,000,000              
Payments to Class B noncontrolling interests investors (7,000,000) (3,000,000) (5,000,000)              
Balances, end of period 1,700,000,000 1,673,000,000 758,000,000       1,700,000,000      
Net income (loss) attributable to NCI 34,000,000 25,000,000 12,000,000              
Differential Membership Interests [Member]                    
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                    
Balances, beginning of period 1,912,000,000 1,983,000,000 2,019,000,000 1,122,000,000 1,167,000,000 0 2,019,000,000 0    
Net income (loss) attributable to NCI (64,000,000) (63,000,000) (60,000,000) (28,000,000) (39,000,000) (269,000,000)        
Differential membership interests contributions, net of distributions 27,000,000 (8,000,000) 24,000,000 23,000,000 (6,000,000) 23,000,000        
Adoption of accounting standards update                   1,413,000,000
Balances, end of period 1,875,000,000 1,912,000,000 1,983,000,000 1,117,000,000 1,122,000,000 1,167,000,000 1,875,000,000 1,117,000,000    
Net income (loss) attributable to NCI (64,000,000) (63,000,000) (60,000,000) (28,000,000) (39,000,000) (269,000,000)        
Noncontrolling Ownership Interests in NEP OpCo and Texas Pipeline [Member]                    
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                    
Balances, beginning of period 671,000,000 307,000,000 422,000,000 473,000,000 165,000,000 34,000,000 422,000,000 34,000,000    
Sale of Class B noncontrolling interest - net         105,000,000          
Acquisition of subsidiaries with noncontrolling ownership interest (10,000,000) 472,000,000                
Related party note receivable   1,000,000     2,000,000 29,000,000        
Net income (loss) attributable to NCI (143,000,000) (64,000,000) (57,000,000) 99,000,000 243,000,000 170,000,000        
Other comprehensive income (loss)     (3,000,000) 15,000,000 (4,000,000) 1,000,000        
Related party contributions   11,000,000 1,000,000 1,000,000            
Related party distributions (71,000,000) (56,000,000) (51,000,000) (48,000,000) (41,000,000) (64,000,000)        
Changes in non-economic ownership interests (6,000,000)   (6,000,000) (1,000,000) 1,000,000 (6,000,000)        
Adoption of accounting standards update                 2,000,000 1,000,000
Other     1,000,000              
Balances, end of period 441,000,000 671,000,000 307,000,000 539,000,000 473,000,000 165,000,000 441,000,000 539,000,000    
Net income (loss) attributable to NCI (143,000,000) (64,000,000) (57,000,000) 99,000,000 243,000,000 170,000,000        
Non-controlling Interests [Member]                    
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                    
Balances, beginning of period 4,256,000,000 3,048,000,000 3,192,000,000 1,595,000,000 1,332,000,000 34,000,000 3,192,000,000 34,000,000    
Sale of Class B noncontrolling interest - net   893,000,000     105,000,000          
Acquisition of subsidiaries with noncontrolling ownership interest (10,000,000) 472,000,000                
Related party note receivable   1,000,000     2,000,000 29,000,000        
Net income (loss) attributable to NCI (173,000,000) (102,000,000) (105,000,000) 71,000,000 204,000,000 (99,000,000)        
Other comprehensive income (loss)     (3,000,000) 15,000,000 (4,000,000) 1,000,000        
Related party contributions   11,000,000 1,000,000 1,000,000            
Related party distributions (71,000,000) (56,000,000) (51,000,000) (48,000,000) (41,000,000) (64,000,000)        
Changes in non-economic ownership interests (6,000,000)   (6,000,000) (1,000,000) 1,000,000 (6,000,000)        
Differential membership interests contributions, net of distributions 27,000,000 (8,000,000) 24,000,000 23,000,000 (6,000,000) 23,000,000        
Payments to Class B noncontrolling interests investors (7,000,000) (3,000,000) (5,000,000)              
Adoption of accounting standards update                 $ 2,000,000 $ 1,414,000,000
Other     1,000,000              
Balances, end of period 4,016,000,000 4,256,000,000 3,048,000,000 1,656,000,000 1,595,000,000 1,332,000,000 $ 4,016,000,000 $ 1,656,000,000    
Net income (loss) attributable to NCI $ (173,000,000) $ (102,000,000) $ (105,000,000) $ 71,000,000 $ 204,000,000 $ (99,000,000)        
[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.