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SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Financial Information      
Total revenues [1] $ 11,132 $ 10,790 $ 11,035
Provision for depreciation 1,302 1,274 1,220
Amortization (deferral) of regulatory assets, net 269 (53) (79)
DPA penalty (Note 13) 230 0 0
Miscellaneous income (expense), net 517 432 243
Interest expense 1,141 1,065 1,033
Income taxes (benefits) 320 126 213
Income (loss) from continuing operations 1,239 1,003 904
Property additions 2,445 2,657 2,665
Total assets 45,432 44,464  
Total goodwill 5,618 5,618  
External revenues      
Segment Financial Information      
Total revenues 11,132 10,790 11,035
Internal revenues      
Segment Financial Information      
Total revenues 0 0 0
Regulated Distribution      
Segment Financial Information      
Total goodwill 5,004    
Regulated Transmission      
Segment Financial Information      
Total revenues 1,608 1,613 1,510
Operating Segments | Regulated Distribution      
Segment Financial Information      
Total revenues 9,711 9,363 9,698
Provision for depreciation 911 896 863
Amortization (deferral) of regulatory assets, net 260 (64) (89)
DPA penalty (Note 13) 0    
Miscellaneous income (expense), net 399 332 174
Interest expense 523 501 495
Income taxes (benefits) 364 113 271
Income (loss) from continuing operations 1,288 959 1,076
Property additions 1,395 1,514 1,473
Total assets 30,812 30,855  
Total goodwill 5,004 5,004  
Operating Segments | Regulated Distribution | External revenues      
Segment Financial Information      
Total revenues 9,510 9,168 9,511
Operating Segments | Regulated Distribution | Internal revenues      
Segment Financial Information      
Total revenues 201 195 187
Operating Segments | Regulated Transmission      
Segment Financial Information      
Total revenues 1,618 1,630 1,526
Provision for depreciation 325 313 284
Amortization (deferral) of regulatory assets, net 9 11 10
DPA penalty (Note 13) 0    
Miscellaneous income (expense), net 41 30 15
Interest expense 248 219 192
Income taxes (benefits) 127 138 113
Income (loss) from continuing operations 408 464 447
Property additions 958 1,067 1,090
Total assets 13,237 12,592  
Total goodwill 614 614  
Operating Segments | Regulated Transmission | External revenues      
Segment Financial Information      
Total revenues 1,608 1,613 1,510
Operating Segments | Regulated Transmission | Internal revenues      
Segment Financial Information      
Total revenues 10 17 16
Corporate/ Other      
Segment Financial Information      
Total revenues 14 9 14
Provision for depreciation 3 4 5
Amortization (deferral) of regulatory assets, net 0 0 0
DPA penalty (Note 13) 230    
Miscellaneous income (expense), net 89 83 80
Interest expense 382 358 372
Income taxes (benefits) (171) (125) (171)
Income (loss) from continuing operations (457) (420) (619)
Property additions 92 76 102
Total assets 1,383 1,017  
Total goodwill 0 0  
Corporate/ Other | External revenues      
Segment Financial Information      
Total revenues 14 9 14
Corporate/ Other | Internal revenues      
Segment Financial Information      
Total revenues 0 0 0
Reconciling Adjustments      
Segment Financial Information      
Total revenues (211) (212) (203)
Provision for depreciation 63 61 68
Amortization (deferral) of regulatory assets, net 0 0 0
DPA penalty (Note 13) 0    
Miscellaneous income (expense), net (12) (13) (26)
Interest expense (12) (13) (26)
Income taxes (benefits) 0 0 0
Income (loss) from continuing operations 0 0 0
Property additions 0 0 0
Total assets 0 0  
Total goodwill 0 0  
Reconciling Adjustments | External revenues      
Segment Financial Information      
Total revenues 0 0 0
Reconciling Adjustments | Internal revenues      
Segment Financial Information      
Total revenues $ (211) $ (212) $ (203)
[1] Includes excise and gross receipts tax collections of $374 million, $362 million and $373 million in 2021, 2020 and 2019, respectively.