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SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Financial Information      
Total revenues [1] $ 10,790 $ 11,035 $ 11,261
Provision for depreciation 1,274 1,220 1,136
Deferral of regulatory assets, net (53) (79) (150)
Miscellaneous income, net 432 243 205
Interest expense 1,065 1,033 1,116
Income taxes (benefits) 126 213 490
Income (loss) from continuing operations 1,003 904 1,022
Property additions 2,657 2,665 2,675
Total assets 44,464 42,301  
Total goodwill 5,618 5,618  
External revenues      
Segment Financial Information      
Total revenues 10,790 11,035 11,261
Internal revenues      
Segment Financial Information      
Total revenues 0 0 0
Utilities and FET      
Segment Financial Information      
Total goodwill 5,004    
Regulated Transmission      
Segment Financial Information      
Total revenues 1,613 1,510 1,335
Operating Segments | Utilities and FET      
Segment Financial Information      
Total revenues 9,363 9,698 10,103
Provision for depreciation 896 863 812
Deferral of regulatory assets, net (64) (89) (163)
Miscellaneous income, net 332 174 192
Interest expense 501 495 514
Income taxes (benefits) 113 271 422
Income (loss) from continuing operations 959 1,076 1,242
Property additions 1,514 1,473 1,411
Total assets 30,855 29,642  
Total goodwill 5,004 5,004  
Operating Segments | Utilities and FET | External revenues      
Segment Financial Information      
Total revenues 9,168 9,511 9,900
Operating Segments | Utilities and FET | Internal revenues      
Segment Financial Information      
Total revenues 195 187 203
Operating Segments | Regulated Transmission      
Segment Financial Information      
Total revenues 1,630 1,526 1,353
Provision for depreciation 313 284 252
Deferral of regulatory assets, net 11 10 13
Miscellaneous income, net 30 15 14
Interest expense 219 192 167
Income taxes (benefits) 138 113 122
Income (loss) from continuing operations 464 447 397
Property additions 1,067 1,090 1,104
Total assets 12,592 11,611  
Total goodwill 614 614  
Operating Segments | Regulated Transmission | External revenues      
Segment Financial Information      
Total revenues 1,613 1,510 1,335
Operating Segments | Regulated Transmission | Internal revenues      
Segment Financial Information      
Total revenues 17 16 18
Corporate/ Other      
Segment Financial Information      
Total revenues 9 14 34
Provision for depreciation 4 5 3
Deferral of regulatory assets, net 0 0 0
Miscellaneous income, net 83 80 32
Interest expense 358 372 468
Income taxes (benefits) (125) (171) (54)
Income (loss) from continuing operations (420) (619) (617)
Property additions 76 102 133
Total assets 1,017 1,015  
Total goodwill 0 0  
Corporate/ Other | External revenues      
Segment Financial Information      
Total revenues 9 14 26
Corporate/ Other | Internal revenues      
Segment Financial Information      
Total revenues 0 0 8
Reconciling Adjustments      
Segment Financial Information      
Total revenues (212) (203) (229)
Provision for depreciation 61 68 69
Deferral of regulatory assets, net 0 0 0
Miscellaneous income, net (13) (26) (33)
Interest expense (13) (26) (33)
Income taxes (benefits) 0 0 0
Income (loss) from continuing operations 0 0 0
Property additions 0 0 27
Total assets 0 33  
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 $ (212) $ (203) $ (229)
[1] Includes excise and gross receipts tax collections of $362 million, $373 million and $386 million in 2020, 2019 and 2018, respectively.