Long-Term Debt (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022	Nov. 15, 2023	Aug. 10, 2023		Mar. 02, 2023	Aug. 08, 2022	Oct. 08, 2021		Mar. 02, 2021
Long-term Debt
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
RMM Acquisition
Long-term Debt
Business Combination, Consideration Transferred, Liabilities Incurred		665	0
Transcontinental Gas Pipe Line Company, LLC [Member] | 7.08% Debentures Due 2026 [Member]
Long-term Debt
Long-term debt		$ 8	8
Long-term debt interest rate		7.08%
Transcontinental Gas Pipe Line Company, LLC [Member] | 7.25% Debentures Due 2026 [Member]
Long-term Debt
Long-term debt		$ 200	200
Long-term debt interest rate		7.25%
Transcontinental Gas Pipe Line Company, LLC [Member] | 7.85% Senior Unsecured Notes Due 2026 [Member]
Long-term Debt
Long-term debt		$ 1,000	1,000
Long-term debt interest rate		7.85%
Transcontinental Gas Pipe Line Company, LLC [Member] | 4% Senior Unsecured Notes Due 2028 [Member]
Long-term Debt
Long-term debt		$ 400	400
Long-term debt interest rate		4.00%
Transcontinental Gas Pipe Line Company, LLC [Member] | 3.25 Percent Senior Unsecured Notes Due 2030 [Member]
Long-term Debt
Long-term debt		$ 700	700
Long-term debt interest rate		3.25%
Transcontinental Gas Pipe Line Company, LLC [Member] | 5.4% Senior Unsecured Notes Due 2041 [Member]
Long-term Debt
Long-term debt		$ 375	375
Long-term debt interest rate		5.40%
Transcontinental Gas Pipe Line Company, LLC [Member] | 4.45% Senior Unsecured Notes Due 2042 [Member]
Long-term Debt
Long-term debt		$ 400	400
Long-term debt interest rate		4.45%
Transcontinental Gas Pipe Line Company, LLC [Member] | 4.6% Senior Unsecured Notes Due 2048 [Member]
Long-term Debt
Long-term debt		$ 600	600
Long-term debt interest rate		4.60%
Transcontinental Gas Pipe Line Company, LLC [Member] | 3.95 Percent Senior Unsecured Notes Due 2050 [Member]
Long-term Debt
Long-term debt		$ 500	500
Long-term debt interest rate		3.95%
Transcontinental Gas Pipe Line Company, LLC [Member] | Atlantic Sunrise [Member]
Long-term Debt
Other financing obligations		$ 790	809
Long-term debt interest rate		9.00%
Transcontinental Gas Pipe Line Company, LLC [Member] | Leidy South
Long-term Debt
Other financing obligations		$ 76	77
Long-term debt interest rate		13.00%
Transcontinental Gas Pipe Line Company, LLC [Member] | Dalton [Member]
Long-term Debt
Other financing obligations		$ 250	252
Long-term debt interest rate		9.00%
MountainWest [Member] | 3.53 Percent Senior Unsecured Notes due 2028
Long-term Debt
Long-term debt		$ 100	0
Long-term debt interest rate		3.53%
MountainWest [Member] | 3.91 Percent Senior Unsecured Notes due 2038
Long-term Debt
Long-term debt		$ 150	0
Long-term debt interest rate		3.91%
MountainWest [Member] | 4.875 Percent Senior Unsecured Notes due 2041
Long-term Debt
Long-term debt		$ 180	0
Long-term debt interest rate		4.875%
Northwest Pipeline LLC [Member] | 7.125% Debentures Due 2025 [Member]
Long-term Debt
Long-term debt		$ 85	85
Long-term debt interest rate		7.125%
Northwest Pipeline LLC [Member] | 4% Senior Unsecured Notes Due 2027 [Member]
Long-term Debt
Long-term debt		$ 500	500
Long-term debt interest rate		4.00%
The Williams Companies, Inc. [Member]
Long-term Debt
Credit facility loans	[1]	$ 0
The Williams Companies, Inc. [Member] | 4.5% Senior Unsecured Notes Due 2023 [Member]
Long-term Debt
Long-term debt		$ 0	600
Long-term debt interest rate		4.50%		4.50%
The Williams Companies, Inc. [Member] | 4.3% Senior Unsecured Notes Due 2024 [Member]
Long-term Debt
Long-term debt		$ 1,000	1,000
Long-term debt interest rate		4.30%
The Williams Companies, Inc. [Member] | 4.55% Senior Unsecured Notes Due 2024 [Member]
Long-term Debt
Long-term debt		$ 1,250	1,250
Long-term debt interest rate		4.55%
The Williams Companies, Inc. [Member] | 3.9% Senior Unsecured Notes Due 2025 [Member]
Long-term Debt
Long-term debt		$ 750	750
Long-term debt interest rate		3.90%
The Williams Companies, Inc. [Member] | 4% Senior Unsecured Notes Due 2025 [Member]
Long-term Debt
Long-term debt		$ 750	750
Long-term debt interest rate		4.00%
The Williams Companies, Inc. [Member] | 5.40 Percent Senior Unsecured Notes Due 2026
Long-term Debt
Long-term debt		$ 1,100	0
Long-term debt interest rate		5.40%			5.40%	[2]	5.40%
The Williams Companies, Inc. [Member] | 3.75% Senior Unsecured Notes Due 2027 [Member]
Long-term Debt
Long-term debt		$ 1,450	1,450
Long-term debt interest rate		3.75%
The Williams Companies, Inc. [Member] | 5.30 Percent Senior Unsecured Notes Due 2028
Long-term Debt
Long-term debt		$ 900	0
Long-term debt interest rate		5.30%			5.30%
The Williams Companies, Inc. [Member] | 3.5 Percent Senior Unsecured Notes Due 2030 [Member]
Long-term Debt
Long-term debt		$ 1,000	1,000
Long-term debt interest rate		3.50%
The Williams Companies, Inc. [Member] | 2.6 Percent Senior Unsecured Notes Due 2031
Long-term Debt
Long-term debt		$ 1,500	1,500
Long-term debt interest rate		2.60%							2.60%	[3]	2.60%
The Williams Companies, Inc. [Member] | 7.5% Debentures Due 2031 [Member]
Long-term Debt
Long-term debt		$ 339	339
Long-term debt interest rate		7.50%
The Williams Companies, Inc. [Member] | 7.75% Senior Unsecured Notes Due 2031 [Member]
Long-term Debt
Long-term debt		$ 252	252
Long-term debt interest rate		7.75%
The Williams Companies, Inc. [Member] | 8.75% Senior Unsecured Notes Due 2032 [Member]
Long-term Debt
Long-term debt		$ 445	445
Long-term debt interest rate		8.75%
The Williams Companies, Inc. [Member] | 4.65 Percent Senior Unsecured Notes Due 2032
Long-term Debt
Long-term debt		$ 1,000	1,000
Long-term debt interest rate		4.65%						4.65%
The Williams Companies, Inc. [Member] | 5.65 Percent Senior Unsecured Notes Due 2033
Long-term Debt
Long-term debt		$ 750	0
Long-term debt interest rate		5.65%					5.65%
The Williams Companies, Inc. [Member] | 6.3% Senior Unsecured Notes Due 2040 [Member]
Long-term Debt
Long-term debt		$ 1,250	1,250
Long-term debt interest rate		6.30%
The Williams Companies, Inc. [Member] | 5.8% Senior Unsecured Notes Due 2043 [Member]
Long-term Debt
Long-term debt		$ 400	400
Long-term debt interest rate		5.80%
The Williams Companies, Inc. [Member] | 5.4% Senior Unsecured Notes Due 2044 [Member]
Long-term Debt
Long-term debt		$ 500	500
Long-term debt interest rate		5.40%
The Williams Companies, Inc. [Member] | 5.75% Senior Unsecured Notes Due 2044 [Member]
Long-term Debt
Long-term debt		$ 650	650
Long-term debt interest rate		5.75%
The Williams Companies, Inc. [Member] | 4.9% Senior Unsecured Notes Due 2045 [Member]
Long-term Debt
Long-term debt		$ 500	500
Long-term debt interest rate		4.90%
The Williams Companies, Inc. [Member] | 5.1% Senior Unsecured Notes Due 2045 [Member]
Long-term Debt
Long-term debt		$ 1,000	1,000
Long-term debt interest rate		5.10%
The Williams Companies, Inc. [Member] | 4.85 Percent Senior Unsecured Notes Due 2048 [Member]
Long-term Debt
Long-term debt		$ 800	800
Long-term debt interest rate		4.85%
The Williams Companies, Inc. [Member] | 3.5 Percent Senior Unsecured Notes Due 2051
Long-term Debt
Long-term debt		$ 650	650
Long-term debt interest rate		3.50%							3.50%
The Williams Companies, Inc. [Member] | 5.3 Percent Senior Unsecured Notes Due 2052
Long-term Debt
Long-term debt		$ 750	750
Long-term debt interest rate		5.30%						5.30%
The Williams Companies, Inc. [Member] | 7.7% Notes due 2027
Long-term Debt
Long-term debt		$ 2	$ 2
Long-term debt interest rate		7.70%

[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.

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

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