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Revenue (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2020
USD ($)
company
MW
Mar. 31, 2019
USD ($)
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers $ 2,629 $ 2,806
Total revenues [1] 2,709 2,883
Other Non-Customer Revenue    
Disaggregation of Revenue [Line Items]    
Late payment charges 10 11
Distribution services    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 1,235 1,265
Retail generation    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 889 1,044
Wholesale sales    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 72 110
Transmission    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 397 352
Other    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 36 35
Derivative Revenue | Other Non-Customer Revenue    
Disaggregation of Revenue [Line Items]    
Total revenues   2
ARP    
Disaggregation of Revenue [Line Items]    
ARP   62
Total revenues 68  
Other non-customer revenue    
Disaggregation of Revenue [Line Items]    
Other non-customer revenue   15
Total revenues 12  
Regulated Distribution    
Disaggregation of Revenue [Line Items]    
Total revenues $ 2,160 2,344
Reduction in revenue   27
Number of existing utility operating companies | company 10  
Megawatts of net demonstrated capacity of competitive segment | MW 3,790  
Utility customer payment period 30 days  
Regulated Distribution | Residential    
Disaggregation of Revenue [Line Items]    
Total revenues $ 1,319 1,484
Regulated Distribution | Commercial    
Disaggregation of Revenue [Line Items]    
Total revenues 544 587
Regulated Distribution | Industrial    
Disaggregation of Revenue [Line Items]    
Total revenues 277 249
Regulated Distribution | Other    
Disaggregation of Revenue [Line Items]    
Total revenues 20 24
Regulated Transmission    
Disaggregation of Revenue [Line Items]    
Total revenues 397 352
Reduction in revenue   5
Regulated Transmission | Other    
Disaggregation of Revenue [Line Items]    
Total revenues 73 71
Regulated Transmission | ATSI    
Disaggregation of Revenue [Line Items]    
Total revenues 204 174
Regulated Transmission | TrAIL    
Disaggregation of Revenue [Line Items]    
Total revenues 63 58
Regulated Transmission | MAIT    
Disaggregation of Revenue [Line Items]    
Total revenues 57 49
Operating Segments    
Disaggregation of Revenue [Line Items]    
Reduction in revenue 23 32
Operating Segments | Regulated Distribution    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 2,267 2,484
Total revenues 2,358 2,573
Operating Segments | Regulated Distribution | Distribution services    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 1,256 1,286
Operating Segments | Regulated Distribution | Retail generation    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 904 1,058
Operating Segments | Regulated Distribution | Wholesale sales    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 71 106
Operating Segments | Regulated Distribution | Transmission    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 0 0
Operating Segments | Regulated Distribution | Other    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 36 34
Operating Segments | Regulated Distribution | ARP    
Disaggregation of Revenue [Line Items]    
ARP   62
Total revenues 68  
Operating Segments | Regulated Distribution | Other non-customer revenue    
Disaggregation of Revenue [Line Items]    
Other non-customer revenue   27
Total revenues 23  
Operating Segments | Regulated Transmission    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 397 352
Total revenues 401 356
Operating Segments | Regulated Transmission | Distribution services    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 0 0
Operating Segments | Regulated Transmission | Retail generation    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 0 0
Operating Segments | Regulated Transmission | Wholesale sales    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 0 0
Operating Segments | Regulated Transmission | Transmission    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 397 352
Operating Segments | Regulated Transmission | Other    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 0 0
Operating Segments | Regulated Transmission | ARP    
Disaggregation of Revenue [Line Items]    
ARP   0
Total revenues 0  
Operating Segments | Regulated Transmission | Other non-customer revenue    
Disaggregation of Revenue [Line Items]    
Other non-customer revenue   4
Total revenues 4  
Corporate/Other and Reconciling Adjustments    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers (35) (30)
Total revenues (50) (46)
Corporate/Other and Reconciling Adjustments | Distribution services    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers (21) (21)
Corporate/Other and Reconciling Adjustments | Retail generation    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers (15) (14)
Corporate/Other and Reconciling Adjustments | Wholesale sales    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 1 4
Corporate/Other and Reconciling Adjustments | Transmission    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 0 0
Corporate/Other and Reconciling Adjustments | Other    
Disaggregation of Revenue [Line Items]    
Total revenues from contracts with customers 0 1
Corporate/Other and Reconciling Adjustments | ARP    
Disaggregation of Revenue [Line Items]    
ARP   0
Total revenues 0  
Corporate/Other and Reconciling Adjustments | Other non-customer revenue    
Disaggregation of Revenue [Line Items]    
Other non-customer revenue   $ (16)
Total revenues $ (15)  
[1] Includes excise and gross receipts tax collections of $92 million and $102 million during the three months ended March 31, 2020 and 2019, respectively.