Debt and Banking Arrangements (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

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

Long-Term Debt

	December 31,
	2021		2020
	(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	830		847
Other financing obligation — Leidy South	72		—
Other financing obligation — Dalton	254		257
Northwest Pipeline:
7.125% Debentures due 2025	85		85
4% Notes due 2027	500		500
Williams:
4% Notes due 2021	—		500
7.875% Notes due 2021	—		371
3.35% Notes due 2022	750		750
3.6% Notes due 2022	1,250		1,250
3.7% Notes due 2023	850		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		—
7.5% Debentures due 2031	339		339
7.75% Notes due 2031	252		252
8.75% Notes due 2032	445		445
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		—
Various — 7.7% to 9.375% Notes and Debentures due 2021 to 2027	2		3
Credit facility loans	—		—
Unamortized debt issuance costs	(131)		(125)
Net unamortized debt premium (discount)	(56)		(63)
Total long-term debt, including current portion	23,675		22,344
Long-term debt due within one year	(2,025)		(893)
Long-term debt	$	21,650	$	21,451

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, 2021
	(Millions)
2022	$	2,026
2023	1,478
2024	2,281
2025	1,619
2026	1,244

Schedule of Line of Credit Facilities [Table Text Block]

Credit Facility

	December 31, 2021
	Stated Capacity		Outstanding
	(Millions)
Long-term credit facility (1)	$	3,750	$	—
Letters of credit under certain bilateral bank agreements			16

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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.