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Segment Information - Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment Financial Information      
Revenues [1] $ 2,989 $ 2,726  
Depreciation 340 323  
Amortization (deferral) of regulatory assets, net (37) 92  
Miscellaneous income (expense), net 106 135  
Interest expense 313 285  
Income taxes (benefits) 83 87  
Income (loss) from continuing operations 288 335  
Property additions 520 604  
Total assets 44,617   $ 45,432
Goodwill 5,618   5,618
External Customers      
Segment Financial Information      
Revenues 2,989 2,726  
Internal Customers      
Segment Financial Information      
Revenues 0 0  
Operating Segments | Regulated Distribution      
Segment Financial Information      
Revenues 2,589 2,370  
Depreciation 235 226  
Amortization (deferral) of regulatory assets, net (38) 87  
Miscellaneous income (expense), net 85 107  
Interest expense 129 128  
Income taxes (benefits) 69 82  
Income (loss) from continuing operations 265 313  
Property additions 317 321  
Total assets 30,883   30,812
Goodwill 5,004   5,004
Operating Segments | Regulated Distribution | External Customers      
Segment Financial Information      
Revenues 2,532 2,321  
Operating Segments | Regulated Distribution | Internal Customers      
Segment Financial Information      
Revenues 57 49  
Operating Segments | Regulated Transmission      
Segment Financial Information      
Revenues 453 405  
Depreciation 86 81  
Amortization (deferral) of regulatory assets, net 1 5  
Miscellaneous income (expense), net 6 11  
Interest expense 59 61  
Income taxes (benefits) 41 33  
Income (loss) from continuing operations 125 109  
Property additions 197 273  
Total assets 13,070   13,237
Goodwill 614   614
Operating Segments | Regulated Transmission | External Customers      
Segment Financial Information      
Revenues 451 401  
Operating Segments | Regulated Transmission | Internal Customers      
Segment Financial Information      
Revenues 2 4  
Corporate/Other      
Segment Financial Information      
Revenues 6 4  
Depreciation 2 1  
Amortization (deferral) of regulatory assets, net 0 0  
Miscellaneous income (expense), net 17 22  
Interest expense 127 101  
Income taxes (benefits) (27) (28)  
Income (loss) from continuing operations (102) (87)  
Property additions 6 10  
Total assets 664   1,383
Goodwill 0   0
Corporate/Other | External Customers      
Segment Financial Information      
Revenues 6 4  
Corporate/Other | Internal Customers      
Segment Financial Information      
Revenues 0 0  
Reconciling Adjustments      
Segment Financial Information      
Revenues (59) (53)  
Depreciation 17 15  
Amortization (deferral) of regulatory assets, net 0 0  
Miscellaneous income (expense), net (2) (5)  
Interest expense (2) (5)  
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 $ (59) $ (53)  
[1] Includes excise and gross receipts tax collections of $103 million and $95 million during the three months ended March 31, 2022 and 2021, respectively.