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Debt and Banking Arrangements (Tables)
 12 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-Term Debt by Issuing Entity
December 31,
 20242023

(Millions)
Transco:
7.08% Debentures due 2026
$8 $8 
7.25% Debentures due 2026
200 200 
7.85% Notes due 2026
1,000 1,000 
4% Notes due 2028
400 400 
3.25% Notes due 2030
700 700 
5.4% Notes due 2041
375 375 
4.45% Notes due 2042
400 400 
4.6% Notes due 2048
600 600 
3.95% Notes due 2050
500 500 
Other financing obligation — Atlantic Sunrise764 790 
Other financing obligation — Leidy South75 76 
Other financing obligation — Dalton247 250 
Unamortized debt issuance costs
(23)(26)
Net unamortized debt premium (discount)
(11)(12)
Total debt — Transco
$5,235 $5,261 
MountainWest:
3.53% Notes due 2028 (Note 3)
$100 $100 
3.91% Notes due 2038 (Note 3)
150 150 
4.875% Notes due 2041 (Note 3)
180 180 
Net unamortized debt premium (discount)
(58)(61)
Total debt — MountainWest
$372 $369 
NWP:
7.125% Debentures due 2025
$85 $85 
4% Notes due 2027
500 500 
Unamortized debt issuance costs
(1)(2)
Net unamortized debt premium (discount)
(2)(2)
Total debt — NWP
$582 $581 
Williams:
4.3% Notes due 2024
$— $1,000 
4.55% Notes due 2024
— 1,250 
3.9% Notes due 2025
750 750 
4% Notes due 2025
750 750 
5.4% Notes due 2026
1,100 1,100 
7.7% Notes due 2027
2 2 
3.75% Notes due 2027
1,450 1,450 
5.3% Notes due 2028
900 900 
4.9% Notes due 2029
1,100 — 
4.8% Notes due 2029
450 — 
3.5% Notes due 2030
1,000 1,000 
2.6% Notes due 2031
1,500 1,500 
7.5% Debentures due 2031
339 339 
7.75% Notes due 2031
252 252 
8.75% Notes due 2032
445 445 
4.65% Notes due 2032
1,000 1,000 
5.65% Notes due 2033
750 750 
5.15% Notes due 2034
1,300 — 
6.3% Notes due 2040
1,250 1,250 
5.8% Notes due 2043
400 400 
December 31,
 20242023

(Millions)
5.4% Notes due 2044
500 500 
5.75% Notes due 2044
650 650 
4.9% Notes due 2045
500 500 
5.1% Notes due 2045
1,000 1,000 
4.85% Notes due 2048
800 800 
3.5% Notes due 2051
650 650 
5.3% Notes due 2052
750 750 
5.8% Notes due 2054
750 — 
Unamortized debt issuance costs
(130)(112)
Net unamortized debt premium (discount)
(41)(39)
Total debt — Williams
$20,167 $18,837 
RMM deferred consideration obligation (Note 3)— 665 
Gulf Coast Storage deferred consideration obligation (Note 3)
100 — 
Total debt
$26,456 $25,713 
Long-term debt due within one year — Williams
(1,600)(2,305)
Long-term debt due within one year — Transco
(35)(32)
Long-term debt due within one year — NWP
(85)— 
Long-term debt$24,736 $23,376 
Schedule of Maturities of Long-term Debt [Table Text Block]
The following table presents aggregate minimum maturities of long-term debt, other financing obligations, and the Gulf Coast Storage deferred consideration obligation, excluding net unamortized debt premium (discount) and debt issuance costs, for each of the next five years: 
December 31, 2024
 (Millions)
Williams:
2025$1,720 
20262,345 
20271,994 
20281,445 
20291,600 
Transco:
2025$35 
20261,245 
202741 
2028445 
202950 
NWP:
2025$85 
2027500 
Schedule of Debt Issuances
Williams senior unsecured public debt issuances for the past three years and subsequent to the balance sheet date are as follows:
Issue Date
Maturity Date
Amount
Rate
(Millions)
January 9, 2025
March 15, 2035$1,000 5.600%
January 9, 2025
March 15, 2055500 6.000%
August 13, 2024November 15, 2029450 4.800%
August 13, 2024 (1)March 15, 2034300 5.150%
August 13, 2024November 15, 2054750 5.800%
January 5, 2024March 15, 20291,100 4.900%
January 5, 2024March 15, 20341,000 5.150%
August 10, 2023 (2)March 2, 2026350 5.400%
August 10, 2023August 15, 2028900 5.300%
March 2, 2023March 2, 2026750 5.400%
March 2, 2023March 15, 2033750 5.650%
August 8, 2022August 15, 20321,000 4.650%
August 8, 2022August 15, 2052750 5.300%
________________
(1)    Additional issuance of the 5.15 percent senior notes due 2034 issued on January 5, 2024, and trade interchangeably with such notes.
(2)    Additional issuance of the 5.40 percent senior notes due 2026 issued on March 2, 2023, and trade interchangeably with such notes.
Schedule of Extinguishment of Debt
Williams’ senior unsecured public debt retirements for the past three years and subsequent to the balance sheet date are as follows:
Date of Retirement
Maturity Date
Amount
Rate
(Millions)
January 15, 2025January 15, 2025$750 3.900%
June 24, 2024June 24, 20241,250 4.550%
March 4, 2024March 4, 20241,000 4.300%
November 15, 2023November 15, 2023600 4.500%
October 17, 2022January 15, 2023850 3.700%
May 16, 2022August 15, 2022750 3.350%
January 18, 2022March 15, 20221,250 3.600%
Schedule of Line of Credit Facilities [Table Text Block]
Credit Facility
December 31, 2024
Stated CapacityOutstanding
(Millions)
Long-term credit facility (1)$3,750 $— 
Letters of credit under certain bilateral bank agreements15 
________________
(1)    In managing its available liquidity, Williams does not expect a maximum outstanding amount in excess of the capacity of its credit facility inclusive of any outstanding amounts under the commercial paper program.
Interest Income and Interest Expense Disclosure
Cash Payments for Interest by Registrant (Net of Amounts Capitalized)
Year Ended December 31,
202420232022
(Millions)
Williams$1,293 $1,152 $1,117 
Transco302 307 326 
NWP24 26 26