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Segment Information - Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Financial Information      
Revenues [1] $ 2,726 $ 2,709  
Depreciation 323 317  
Amortization of regulatory assets, net 92 52  
Miscellaneous income (expense), net 135 100  
Interest expense 285 263  
Income taxes (benefits) 87 (60)  
Income (loss) from continuing operations 335 24  
Property additions 604 616  
Total assets 44,117   $ 44,464
Goodwill 5,618   5,618
External Customers      
Segment Financial Information      
Revenues 2,726 2,709  
Internal Customers      
Segment Financial Information      
Revenues 0 0  
Regulated Distribution      
Segment Financial Information      
Revenues 2,274 2,160  
Regulated Transmission      
Segment Financial Information      
Revenues 401 397  
Operating Segments | Regulated Distribution      
Segment Financial Information      
Revenues 2,370 2,358  
Depreciation 226 223  
Amortization of regulatory assets, net 87 49  
Miscellaneous income (expense), net 107 75  
Interest expense 128 127  
Income taxes (benefits) 82 (32)  
Income (loss) from continuing operations 313 136  
Property additions 321 338  
Total assets 30,331   30,855
Goodwill 5,004   5,004
Operating Segments | Regulated Distribution | External Customers      
Segment Financial Information      
Revenues 2,321 2,311  
Operating Segments | Regulated Distribution | Internal Customers      
Segment Financial Information      
Revenues 49 47  
Operating Segments | Regulated Transmission      
Segment Financial Information      
Revenues 405 401  
Depreciation 81 76  
Amortization of regulatory assets, net 5 3  
Miscellaneous income (expense), net 11 6  
Interest expense 61 52  
Income taxes (benefits) 33 34  
Income (loss) from continuing operations 109 117  
Property additions 273 269  
Total assets 12,753   12,592
Goodwill 614   614
Operating Segments | Regulated Transmission | External Customers      
Segment Financial Information      
Revenues 401 397  
Operating Segments | Regulated Transmission | Internal Customers      
Segment Financial Information      
Revenues 4 4  
Corporate/Other      
Segment Financial Information      
Revenues 4 1  
Depreciation 1 2  
Amortization of regulatory assets, net 0 0  
Miscellaneous income (expense), net 22 25  
Interest expense 101 90  
Income taxes (benefits) (28) (62)  
Income (loss) from continuing operations (87) (229)  
Property additions 10 9  
Total assets 1,033   1,017
Goodwill 0   0
Corporate/Other | External Customers      
Segment Financial Information      
Revenues 4 1  
Corporate/Other | Internal Customers      
Segment Financial Information      
Revenues 0 0  
Reconciling Adjustments      
Segment Financial Information      
Revenues (53) (51)  
Depreciation 15 16  
Amortization of regulatory assets, net 0 0  
Miscellaneous income (expense), net (5) (6)  
Interest expense (5) (6)  
Income taxes (benefits) 0 0  
Income (loss) from continuing operations 0 0  
Property additions 0 0  
Total assets 0   0
Goodwill 0   $ 0
Reconciling Adjustments | External Customers      
Segment Financial Information      
Revenues 0 0  
Reconciling Adjustments | Internal Customers      
Segment Financial Information      
Revenues $ (53) $ (51)  
[1] Includes excise and gross receipts tax collections of $95 million and $92 million during the three months ended March 31, 2021 and 2020, respectively.