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Provision (Benefit) for Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2025
Income Tax Expense (Benefit), Continuing Operations [Abstract]  
Schedule of Components of Provision (benefit) for income taxes [Table Text Block]
Williams’ Provision (benefit) for income taxes includes:
Three Months Ended  
June 30,		Six Months Ended  
June 30,
2025202420252024
(Millions)
Current:
Federal$84 $19 $163 $54 
State11 4 18 10 
95 23 181 64 
Deferred:
Federal63 90 152 217 
State16 16 34 41 
79 106 186 258 
Provision (benefit) for income taxes$174 $129 $367 $322