Debt and Banking Arrangements (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-Term Debt

	December 31,
	2023		2022
	(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 Sunrise	790		809
Other financing obligation — Leidy South	76		77
Other financing obligation — Dalton	250		252
MountainWest:
3.53% Notes due 2028 (Note 3)	100		—
3.91% Notes due 2038 (Note 3)	150		—
4.875% Notes due 2041 (Note 3)	180		—
Northwest Pipeline:
7.125% Debentures due 2025	85		85
4% Notes due 2027	500		500
Williams:
4.5% Notes due 2023	—		600
4.3% Notes due 2024	1,000		1,000
4.55% Notes due 2024	1,250		1,250
3.9% Notes due 2025	750		750
4% Notes due 2025	750		750
5.4% Notes due 2026	1,100		—
3.75% Notes due 2027	1,450		1,450
5.3% Notes due 2028	900		—
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		—
6.3% Notes due 2040	1,250		1,250
5.8% Notes due 2043	400		400
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
7.7% Notes due 2027	2		2
RMM deferred consideration obligation (Note 3)	665		—
Unamortized debt issuance costs	(140)		(135)
Net unamortized debt premium (discount)	(114)		(55)
Total long-term debt, including current portion	25,713		22,554
Long-term debt due within one year	(2,337)		(627)
Long-term debt	$	23,376	$	21,927

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 RMM deferred consideration obligation, excluding net unamortized debt premium (discount) and debt issuance costs, for each of the next five years: 

	December 31, 2023
	(Millions)
2024	$	2,338
2025	2,263
2026	2,345
2027	1,993
2028	1,445

Schedule of Debt Issuances

Our 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 5, 2024	March 15, 2029	$	1,100	4.900%
January 5, 2024	March 15, 2034	1,000		5.150%
August 10, 2023 (1)	March 2, 2026	350		5.400%
August 10, 2023	August 15, 2028	900		5.300%
March 2, 2023	March 2, 2026	750		5.400%
March 2, 2023	March 15, 2033	750		5.650%
August 8, 2022	August 15, 2032	1,000		4.650%
August 8, 2022	August 15, 2052	750		5.300%
October 8, 2021 (2)	March 15, 2031	600		2.600%
October 8, 2021	October 15, 2051	650		3.500%
March 2, 2021	March 15, 2031	900		2.600%

(1)    Additional issuance of the 5.40 percent senior notes due 2026 issued on March 2, 2023, and trade interchangeably with such notes.

(2)    Additional issuance of the 2.6 percent senior notes due 2031 issued on March 2, 2021, and trade interchangeably with such notes.

Schedule of Extinguishment of Debt

Our senior unsecured public debt retirements for the past three years are as follows:

Date of Retirement	Maturity Date	Amount		Rate
		(Millions)
November 15, 2023	November 15, 2023	$	600	4.500%
October 17, 2022	January 15, 2023	850		3.700%
May 16, 2022	August 15, 2022	750		3.350%
January 18, 2022	March 15, 2022	1,250		3.600%
September 1, 2021	September 1, 2021	371		7.875%
August 16, 2021	November 15, 2021	500		4.000%

Schedule of Line of Credit Facilities [Table Text Block]

Credit Facility

	December 31, 2023
	Stated Capacity		Outstanding
	(Millions)
Long-term credit facility (1)	$	3,750	$	—
Letters of credit under certain bilateral bank agreements			16

________________

(1)    In managing our available liquidity, we do not expect a maximum outstanding amount in excess of the capacity of our credit facility inclusive of any outstanding amounts under our commercial paper program.