Debt and Banking Arrangements (Tables)

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

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

Long-Term Debt

	December 31,
	2022		2021
	(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	809		830
Other financing obligation — Leidy South	77		72
Other financing obligation — Dalton	252		254
Northwest Pipeline:
7.125% Debentures due 2025	85		85
4% Notes due 2027	500		500
Williams:
3.35% Notes due 2022	—		750
3.6% Notes due 2022	—		1,250
3.7% Notes due 2023	—		850
4.5% Notes due 2023	600		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
3.75% Notes due 2027	1,450		1,450
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		—
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		—
Various — 7.7% to 8.72% Notes due 2022 to 2027	2		2
Unamortized debt issuance costs	(135)		(131)
Net unamortized debt premium (discount)	(55)		(56)
Total long-term debt, including current portion	22,554		23,675
Long-term debt due within one year	(627)		(2,025)
Long-term debt	$	21,927	$	21,650

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

The following table presents aggregate minimum maturities of long-term debt and other financing obligations, excluding net unamortized debt premium (discount) and debt issuance costs, for each of the next five years: 

	December 31, 2022
	(Millions)
2023	$	629
2024	2,281
2025	1,619
2026	1,245
2027	1,993

Schedule of Line of Credit Facilities [Table Text Block]

Credit Facility

	December 31, 2022
	Stated Capacity		Outstanding
	(Millions)
Long-term credit facility (1)	$	3,750	$	—
Letters of credit under certain bilateral bank agreements			30

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(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.