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Segment Information - Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Financial Information          
Revenues $ 3,022 [1] $ 2,963 [1] $ 8,253 $ 8,362  
Depreciation 316 304 954 910  
Amortization (deferral) of regulatory assets, net (91) 43 (26) 85  
Miscellaneous income (expense), net 100 57 303 191  
Interest expense 266 261 792 773  
Income taxes (benefits) 116 107 122 281  
Income (loss) from continuing operations 460 389 791 1,085  
Property additions 687 684 1,979 1,912  
Total assets 42,938   42,938   $ 42,301
Goodwill 5,618   5,618   5,618
External Customers          
Segment Financial Information          
Revenues 3,022 2,963 8,253 8,362  
Internal Customers          
Segment Financial Information          
Revenues 0 0 0 0  
Regulated Distribution          
Segment Financial Information          
Revenues 2,508 2,446 6,735 6,756  
Regulated Transmission          
Segment Financial Information          
Revenues 408 371 1,185 1,090  
Operating Segments | Regulated Distribution          
Segment Financial Information          
Revenues 2,661 2,636 7,207 7,401  
Depreciation 223 215 672 644  
Amortization (deferral) of regulatory assets, net (91) 42 (32) 79  
Miscellaneous income (expense), net 81 36 246 128  
Interest expense 124 124 374 370  
Income taxes (benefits) 109 103 144 259  
Income (loss) from continuing operations 413 370 800 957  
Property additions 391 365 1,115 1,037  
Total assets 30,249   30,249   29,642
Goodwill 5,004   5,004   5,004
Operating Segments | Regulated Distribution | External Customers          
Segment Financial Information          
Revenues 2,611 2,590 7,062 7,261  
Operating Segments | Regulated Distribution | Internal Customers          
Segment Financial Information          
Revenues 50 46 145 140  
Operating Segments | Regulated Transmission          
Segment Financial Information          
Revenues 413 375 1,198 1,103  
Depreciation 79 71 233 211  
Amortization (deferral) of regulatory assets, net 0 1 6 6  
Miscellaneous income (expense), net 7 4 21 12  
Interest expense 55 49 162 142  
Income taxes (benefits) 35 26 103 87  
Income (loss) from continuing operations 115 113 346 333  
Property additions 278 304 817 835  
Total assets 12,078   12,078   11,611
Goodwill 614   614   614
Operating Segments | Regulated Transmission | External Customers          
Segment Financial Information          
Revenues 408 371 1,185 1,091  
Operating Segments | Regulated Transmission | Internal Customers          
Segment Financial Information          
Revenues 5 4 13 12  
Corporate/Other          
Segment Financial Information          
Revenues 3 2 6 10  
Depreciation 0 0 2 3  
Amortization (deferral) of regulatory assets, net 0 0 0 0  
Miscellaneous income (expense), net 13 24 45 73  
Interest expense 88 95 265 283  
Income taxes (benefits) (28) (22) (125) (65)  
Income (loss) from continuing operations (68) (94) (355) (205)  
Property additions 18 15 47 40  
Total assets 611   611   1,015
Goodwill 0   0   0
Corporate/Other | External Customers          
Segment Financial Information          
Revenues 3 2 6 10  
Corporate/Other | Internal Customers          
Segment Financial Information          
Revenues 0 0 0 0  
Reconciling Adjustments          
Segment Financial Information          
Revenues (55) (50) (158) (152)  
Depreciation 14 18 47 52  
Amortization (deferral) of regulatory assets, net 0 0 0 0  
Miscellaneous income (expense), net (1) (7) (9) (22)  
Interest expense (1) (7) (9) (22)  
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   33
Goodwill 0   0   $ 0
Reconciling Adjustments | External Customers          
Segment Financial Information          
Revenues 0 0 0 0  
Reconciling Adjustments | Internal Customers          
Segment Financial Information          
Revenues $ (55) $ (50) $ (158) $ (152)  
[1] Includes excise and gross receipts tax collections of $100 million during each of the three months ended September 30, 2020 and 2019, and $276 million and $283 million during the nine months ended September 30, 2020 and 2019, respectively.