v3.26.3
SEGMENT INFORMATION (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting                  
Operating revenues $ 476     $ 454     $ 1,424 $ 1,338  
Depreciation and amortization 94     88     278 258  
Interest expense, net 102     92     299 272  
Other Segment Items 86     101     302 301  
Income before income taxes 194     173     545 507  
INCOME TAX PROVISION 45     40     124 120  
Subsidiary net earnings 0     0     0 0  
Net income 149 $ 135 $ 137 133 $ 127 $ 127 421 387  
Expenditures for property, plant and equipment             1,153 973  
Property, plant and equipment (net of accumulated depreciation and amortization of $3,067 and $2,892, respectively) 14,165           14,165   $ 13,196
Goodwill 950           950   950
Assets 15,900           15,900   14,834
Regulated Operating Subsidiaries | Regulated Operating Subsidiaries                  
Segment Reporting                  
Operating revenues 487     463     1,456 1,365  
Depreciation and amortization 94     88     278 258  
Interest expense, net 52     47     149 137  
Other Segment Items 97     101     307 306  
Income before income taxes 244     227     722 664  
INCOME TAX PROVISION 58     55     172 161  
Subsidiary net earnings 0     0     0 0  
Net income 186     172     550 503  
Expenditures for property, plant and equipment             1,153 974  
Property, plant and equipment (net of accumulated depreciation and amortization of $3,067 and $2,892, respectively) 14,158           14,158   13,189
Goodwill 950           950   950
Assets 15,728           15,728   14,680
ITC Holdings and Other                  
Segment Reporting                  
Operating revenues 1     0     1 0  
Depreciation and amortization 0     0     0 0  
Interest expense, net 51     45     152 135  
Other Segment Items 0     9     26 22  
Loss before Income Taxes, Noncontrolling Interest (50)     (54)     (177) (157)  
INCOME TAX PROVISION (13)     (15)     (48) (41)  
Subsidiary net earnings 186     172     550 503  
Net income 149     133     421 387  
Expenditures for property, plant and equipment             (1) 0  
Property, plant and equipment (net of accumulated depreciation and amortization of $3,067 and $2,892, respectively) 7           7   7
Goodwill 0           0   0
Assets 8,238           8,238   7,761
Reconciliations/Eliminations                  
Segment Reporting                  
Operating revenues (12)     (9)     (33) (27)  
Depreciation and amortization 0     0     0 0  
Interest expense, net (1)     0     (2) 0  
Other Segment Items (11)     (9)     (31) (27)  
Income before income taxes 0     0     0 0  
INCOME TAX PROVISION 0     0     0 0  
Subsidiary net earnings (186)     (172)     (550) (503)  
Net income (186)     $ (172)     (550) (503)  
Expenditures for property, plant and equipment             (1) $ (1)  
Property, plant and equipment (net of accumulated depreciation and amortization of $3,067 and $2,892, respectively) 0           0   0
Goodwill 0           0   0
Assets $ (8,066)           $ (8,066)   $ (7,607)