Long-Term Debt (Details) - USD ($) $ in Millions			12 Months Ended
		Jan. 03, 2024	Dec. 31, 2024	Dec. 31, 2023	Aug. 13, 2024		Jun. 24, 2024	Mar. 04, 2024	Jan. 05, 2024	Aug. 10, 2023		Mar. 02, 2023	Aug. 08, 2022
Long-term Debt
Long-term debt due within one year			$ (1,720)	$ (2,337)
Long-term debt			24,736	23,376
Debt, Long-Term and Short-Term, Combined Amount			26,456	25,713
RMM Acquisition
Long-term Debt
Business Combination, Consideration Transferred, Liabilities Incurred			0	665
Gulf Coast Storage Acquisition
Long-term Debt
Business Combination, Consideration Transferred, Liabilities Incurred		$ 100	100	0
Transcontinental Gas Pipe Line Company, LLC [Member]
Long-term Debt
Unamortized debt issuance costs			(23)	(26)
Debt Instrument, Unamortized Discount (Premium), Net			(11)	(12)
Total long-term debt, including current portion			5,235	5,261
Long-term debt due within one year			(35)	(32)
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			$ 764	790
Long-term debt interest rate			9.00%
Transcontinental Gas Pipe Line Company, LLC [Member] | Leidy South
Long-term Debt
Other financing obligations			$ 75	76
Long-term debt interest rate			13.00%
Transcontinental Gas Pipe Line Company, LLC [Member] | Dalton [Member]
Long-term Debt
Other financing obligations			$ 247	250
Long-term debt interest rate			9.00%
MountainWest [Member]
Long-term Debt
Debt Instrument, Unamortized Discount (Premium), Net			$ (58)	(61)
Total long-term debt, including current portion			372	369
MountainWest [Member] | 3.53 Percent Senior Unsecured Notes due 2028
Long-term Debt
Long-term debt			$ 100	100
Long-term debt interest rate			3.53%
MountainWest [Member] | 3.91 Percent Senior Unsecured Notes due 2038
Long-term Debt
Long-term debt			$ 150	150
Long-term debt interest rate			3.91%
MountainWest [Member] | 4.875 Percent Senior Unsecured Notes due 2041
Long-term Debt
Long-term debt			$ 180	180
Long-term debt interest rate			4.875%
Northwest Pipeline LLC [Member]
Long-term Debt
Unamortized debt issuance costs			$ (1)	(2)
Debt Instrument, Unamortized Discount (Premium), Net			(2)	(2)
Total long-term debt, including current portion			582	581
Long-term debt due within one year			(85)	0
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
Unamortized debt issuance costs			(130)	(112)
Debt Instrument, Unamortized Discount (Premium), Net			(41)	(39)
Total long-term debt, including current portion			20,167	18,837
Long-term debt due within one year			(1,600)	(2,305)
The Williams Companies, Inc. [Member] | 4.3% Senior Unsecured Notes Due 2024 [Member]
Long-term Debt
Long-term debt			$ 0	1,000
Long-term debt interest rate			4.30%					4.30%
The Williams Companies, Inc. [Member] | 4.55% Senior Unsecured Notes Due 2024 [Member]
Long-term Debt
Long-term debt			$ 0	1,250
Long-term debt interest rate			4.55%				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	1,100
Long-term debt interest rate			5.40%							5.40%	[2]	5.40%
The Williams Companies, Inc. [Member] | 7.7 Percent Senior Unsecured Notes Due 2027
Long-term Debt
Long-term debt			$ 2	2
Long-term debt interest rate			7.70%
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	900
Long-term debt interest rate			5.30%							5.30%
The Williams Companies, Inc. [Member] | 4.9 Percent Senior Unsecured Notes Due 2029
Long-term Debt
Long-term debt			$ 1,100	0
Long-term debt interest rate			4.90%						4.90%
The Williams Companies, Inc. [Member] | 4.8 Percent Senior Unsecured Notes Due 2029
Long-term Debt
Long-term debt			$ 450	0
Long-term debt interest rate			4.80%		4.80%
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%
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	750
Long-term debt interest rate			5.65%									5.65%
The Williams Companies, Inc. [Member] | 5.15 Percent Senior Unsecured Notes Due 2034
Long-term Debt
Long-term debt			$ 1,300	0
Long-term debt interest rate			5.15%		5.15%	[3]			5.15%
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%
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] | 5.8 Percent Senior Unsecured Notes Due 2054
Long-term Debt
Long-term debt			$ 750	$ 0
Long-term debt interest rate			5.80%		5.80%

[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.

[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 5.15 percent senior notes due 2034 issued on January 5, 2024, and trade interchangeably with such notes.