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Segment Information - Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Segment Financial Information          
Revenues [1] $ 2,622 $ 2,522 $ 5,348 $ 5,231  
Depreciation 323 321 646 638  
Amortization of regulatory assets, net 49 13 141 65  
DPA penalty (Note 9) 230 0 230 0  
Miscellaneous income (expense), net 108 103 243 203  
Interest expense 287 263 572 526  
Income taxes (benefits) 96 66 183 6  
Income (loss) from continuing operations 58 307 393 331  
Property additions 622 676 1,226 1,292  
Total assets 44,363   44,363   $ 44,464
Goodwill 5,618   5,618   5,618
External Customers          
Segment Financial Information          
Revenues 2,622 2,522 5,348 5,231  
Internal Customers          
Segment Financial Information          
Revenues 0 0 0 0  
Regulated Distribution          
Segment Financial Information          
Revenues 2,135 2,067 4,409 4,227  
Regulated Transmission          
Segment Financial Information          
Revenues 411 380 812 777  
Operating Segments | Regulated Distribution          
Segment Financial Information          
Revenues 2,258 2,188 4,628 4,546  
Depreciation 229 226 455 449  
Amortization of regulatory assets, net 43 10 130 59  
DPA penalty (Note 9) 0   0    
Miscellaneous income (expense), net 88 90 195 165  
Interest expense 131 123 259 250  
Income taxes (benefits) 71 67 153 35  
Income (loss) from continuing operations 274 251 587 387  
Property additions 346 386 667 724  
Total assets 30,943   30,943   30,855
Goodwill 5,004   5,004   5,004
Operating Segments | Regulated Distribution | External Customers          
Segment Financial Information          
Revenues 2,208 2,140 4,529 4,451  
Operating Segments | Regulated Distribution | Internal Customers          
Segment Financial Information          
Revenues 50 48 99 95  
Operating Segments | Regulated Transmission          
Segment Financial Information          
Revenues 419 384 824 785  
Depreciation 77 78 158 154  
Amortization of regulatory assets, net 6 3 11 6  
DPA penalty (Note 9) 0   0    
Miscellaneous income (expense), net 11 8 22 14  
Interest expense 63 55 124 107  
Income taxes (benefits) 37 34 70 68  
Income (loss) from continuing operations 116 114 225 231  
Property additions 257 270 530 539  
Total assets 12,779   12,779   12,592
Goodwill 614   614   614
Operating Segments | Regulated Transmission | External Customers          
Segment Financial Information          
Revenues 411 380 812 777  
Operating Segments | Regulated Transmission | Internal Customers          
Segment Financial Information          
Revenues 8 4 12 8  
Corporate/Other          
Segment Financial Information          
Revenues 3 2 7 3  
Depreciation 1 0 2 2  
Amortization of regulatory assets, net 0 0 0 0  
DPA penalty (Note 9) 230   230    
Miscellaneous income (expense), net 14 7 36 32  
Interest expense 98 87 199 177  
Income taxes (benefits) (12) (35) (40) (97)  
Income (loss) from continuing operations (332) (58) (419) (287)  
Property additions 19 20 29 29  
Total assets 641   641   1,017
Goodwill 0   0   0
Corporate/Other | External Customers          
Segment Financial Information          
Revenues 3 2 7 3  
Corporate/Other | Internal Customers          
Segment Financial Information          
Revenues 0 0 0 0  
Reconciling Adjustments          
Segment Financial Information          
Revenues (58) (52) (111) (103)  
Depreciation 16 17 31 33  
Amortization of regulatory assets, net 0 0 0 0  
DPA penalty (Note 9) 0   0    
Miscellaneous income (expense), net (5) (2) (10) (8)  
Interest expense (5) (2) (10) (8)  
Income taxes (benefits) 0 0 0 0  
Income (loss) from continuing operations 0 0 0 0  
Property additions 0 0 0 0  
Total assets 0   0   0
Goodwill 0   0   $ 0
Reconciling Adjustments | External Customers          
Segment Financial Information          
Revenues 0 0 0 0  
Reconciling Adjustments | Internal Customers          
Segment Financial Information          
Revenues $ (58) $ (52) $ (111) $ (103)  
[1] Includes excise and gross receipts tax collections of $85 million and $84 million during the three months ended June 30, 2021 and 2020, respectively, and $180 million and $176 million during the six months ended June 30, 2021 and 2020, respectively.