v3.26.1
SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting              
Operating revenues $ 475   $ 444   $ 948 $ 884  
Depreciation and amortization 93   86   184 170  
Interest expense, net 104   91   197 180  
Other Segment Items 104   98   216 200  
Income before income taxes 174   169   351 334  
INCOME TAX PROVISION 39   42   79 80  
Subsidiary net earnings 0   0   0 0  
Net income 135 $ 137 127 $ 127 272 254  
Expenditures for property, plant and equipment         739 657  
Property, plant and equipment (net of accumulated depreciation and amortization of $3,010 and $2,892, respectively) 13,832       13,832   $ 13,196
Goodwill 950       950   950
Assets 15,590       15,590   14,834
Regulated Operating Subsidiaries | Regulated Operating Subsidiaries              
Segment Reporting              
Operating revenues 485   453   969 902  
Depreciation and amortization 93   86   184 170  
Interest expense, net 49   45   97 90  
Other Segment Items 102   101   210 205  
Income before income taxes 241   221   478 437  
INCOME TAX PROVISION 57   54   114 106  
Subsidiary net earnings 0   0   0 0  
Net income 184   167   364 331  
Expenditures for property, plant and equipment         729 648  
Property, plant and equipment (net of accumulated depreciation and amortization of $3,010 and $2,892, respectively) 13,825       13,825   13,189
Goodwill 950       950   950
Assets 15,418       15,418   14,680
ITC Holdings and Other              
Segment Reporting              
Operating revenues 0   0   0 0  
Depreciation and amortization 0   0   0 0  
Interest expense, net 56   46   101 90  
Other Segment Items 11   6   26 13  
Loss before Income Taxes, Noncontrolling Interest (67)   (52)   (127) (103)  
INCOME TAX PROVISION (18)   (12)   (35) (26)  
Subsidiary net earnings 184   167   364 331  
Net income 135   127   272 254  
Expenditures for property, plant and equipment         0 0  
Property, plant and equipment (net of accumulated depreciation and amortization of $3,010 and $2,892, respectively) 7       7   7
Goodwill 0       0   0
Assets 8,132       8,132   7,761
Reconciliations/Eliminations              
Segment Reporting              
Operating revenues (10)   (9)   (21) (18)  
Depreciation and amortization 0   0   0 0  
Interest expense, net (1)   0   (1) 0  
Other Segment Items (9)   (9)   (20) (18)  
Income before income taxes 0   0   0 0  
INCOME TAX PROVISION 0   0   0 0  
Subsidiary net earnings (184)   (167)   (364) (331)  
Net income (184)   $ (167)   (364) (331)  
Expenditures for property, plant and equipment         10 $ 9  
Property, plant and equipment (net of accumulated depreciation and amortization of $3,010 and $2,892, respectively) 0       0   0
Goodwill 0       0   0
Assets $ (7,960)       $ (7,960)   $ (7,607)