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Revenue (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
company
MW
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
company
MW
Jun. 30, 2019
USD ($)
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers $ 2,493 $ 2,448 $ 5,122 $ 5,254
Total revenues 2,522 [1] 2,516 [1] 5,231 5,399
Other Non-Customer Revenue        
Disaggregation of Revenue [Line Items]        
Late payment charges 6 9 16 20
Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,219 1,139 2,454 2,404
Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 811 792 1,700 1,836
Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 52 113 124 223
Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 380 367 777 719
Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 31 37 67 72
Derivative Revenue | Other Non-Customer Revenue        
Disaggregation of Revenue [Line Items]        
Total revenues 6 3 6 5
ARP        
Disaggregation of Revenue [Line Items]        
ARP   55 83 117
Total revenues 15      
Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Other non-customer revenue   13 26 28
Total revenues 14      
Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues $ 2,067 1,966 $ 4,227 4,310
Reduction in revenue       27
Number of existing utility operating companies | company 10   10  
Megawatts of net demonstrated capacity of competitive segment | MW 3,790   3,790  
Utility customer payment period     30 days  
Regulated Distribution | Residential        
Disaggregation of Revenue [Line Items]        
Total revenues $ 1,280 1,123 $ 2,599 2,607
Regulated Distribution | Commercial        
Disaggregation of Revenue [Line Items]        
Total revenues 507 572 1,051 1,159
Regulated Distribution | Industrial        
Disaggregation of Revenue [Line Items]        
Total revenues 259 251 536 500
Regulated Distribution | Other        
Disaggregation of Revenue [Line Items]        
Total revenues 21 20 41 44
Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues 380 367 777 719
Reduction in revenue       7
Regulated Transmission | Other        
Disaggregation of Revenue [Line Items]        
Total revenues 72 74 145 145
Regulated Transmission | ATSI        
Disaggregation of Revenue [Line Items]        
Total revenues 192 184 396 358
Regulated Transmission | TrAIL        
Disaggregation of Revenue [Line Items]        
Total revenues 58 59 121 117
Regulated Transmission | MAIT        
Disaggregation of Revenue [Line Items]        
Total revenues 58 50 115 99
Operating Segments        
Disaggregation of Revenue [Line Items]        
Reduction in revenue 22 2 45 34
Operating Segments | Regulated Distribution        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2,148 2,113 4,415 4,597
Total revenues 2,188 2,192 4,546 4,765
Operating Segments | Regulated Distribution | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 1,241 1,160 2,497 2,446
Operating Segments | Regulated Distribution | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 826 806 1,730 1,864
Operating Segments | Regulated Distribution | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 50 110 121 216
Operating Segments | Regulated Distribution | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Distribution | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 31 37 67 71
Operating Segments | Regulated Distribution | ARP        
Disaggregation of Revenue [Line Items]        
ARP 15 55   117
Total revenues     83  
Operating Segments | Regulated Distribution | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Other non-customer revenue 25 24   51
Total revenues     48  
Operating Segments | Regulated Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 380 367 777 719
Total revenues 384 372 785 728
Operating Segments | Regulated Transmission | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Transmission | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Transmission | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Transmission | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 380 367 777 719
Operating Segments | Regulated Transmission | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Operating Segments | Regulated Transmission | ARP        
Disaggregation of Revenue [Line Items]        
ARP 0 0   0
Total revenues     0  
Operating Segments | Regulated Transmission | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Other non-customer revenue 4 5   9
Total revenues     8  
Corporate/Other and Reconciling Adjustments        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (35) (32) (70) (62)
Total revenues (50) (48) (100) (94)
Corporate/Other and Reconciling Adjustments | Distribution services        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (22) (21) (43) (42)
Corporate/Other and Reconciling Adjustments | Retail generation        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers (15) (14) (30) (28)
Corporate/Other and Reconciling Adjustments | Wholesale sales        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 2 3 3 7
Corporate/Other and Reconciling Adjustments | Transmission        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 0
Corporate/Other and Reconciling Adjustments | Other        
Disaggregation of Revenue [Line Items]        
Total revenues from contracts with customers 0 0 0 1
Corporate/Other and Reconciling Adjustments | ARP        
Disaggregation of Revenue [Line Items]        
ARP 0 0   0
Total revenues     0  
Corporate/Other and Reconciling Adjustments | Other non-customer revenue        
Disaggregation of Revenue [Line Items]        
Other non-customer revenue $ (15) $ (16)   $ (32)
Total revenues     $ (30)  
[1] Includes excise and gross receipts tax collections of $84 million and $81 million during the three months ended June 30, 2020 and 2019, respectively, and $176 million and $183 million during the six months ended June 30, 2020 and 2019, respectively.