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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2024
Accrued Liabilities, Current [Abstract]  
Other Current Liabilities [Table Text Block]
Williams
 December 31,
 20242023
 (Millions)
Interest on debt$350 $322 
Employee costs285 197 
Contract liabilities (Note 5)170 159 
Alaska refinery contamination litigation (Note 1)— 134 
Asset retirement obligations (Note 9)91 106 
Regulatory liabilities (Note 10)85 77 
Operating lease liabilities (Note 14)26 24 
Other, including accrued loss contingencies353 265 
$1,360 $1,284 

Transco
 December 31,
 20242023
 (Millions)
Interest on debt$76 $76 
Contract liabilities10 10 
Customer deposits38 35 
Other57 69 
$181 $190 

NWP
 December 31,
 20242023
 (Millions)
Interest on debt$6 $6 
Taxes, other than income taxes8 7 
Contract liabilities— 1 
Transportation and gas exchange payables10 5 
Other10 15 
$34 $34