Equity-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Williams Companies Incentive Plan [Member]
Equity-Based Compensation (Textuals) [Abstract]
Shares authorized for issuance	50,000
Shares reserved for future issuance	17,000
Shares available for future grants	9,000
Equity-based compensation expense	$ 99	$ 77	$ 73
Tax benefit from equity-based compensation expense	24	$ 19	$ 18
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Unrecognized equity-based compensation expense	$ 70
Unrecognized equity-based compensation expense, Weighted-average period of recognition in years	1 year 8 months 12 days
Williams Companies Incentive Plan [Member] | Nonvested Restricted Stock Units [Member]
Rollforward of nonvested restricted stock unit activity and related information
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	6,400	6,600
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 32.48	$ 28.34
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	3,100	3,800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 31.77	$ 27.43
Williams Companies Incentive Plan [Member] | Performance Shares [Member]
Rollforward of nonvested restricted stock unit activity and related information
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,800
Williams Companies Incentive Plan [Member] | Performance Shares [Member] | Minimum [Member]
Rollforward of nonvested restricted stock unit activity and related information
Range of vested shares based on extent to which certain financial targets are achieved	0.00%
Williams Companies Incentive Plan [Member] | Performance Shares [Member] | Maximum [Member]
Rollforward of nonvested restricted stock unit activity and related information
Range of vested shares based on extent to which certain financial targets are achieved	200.00%
Williams Companies Incentive Plan [Member] | Stock options [Member]
Rollforward of stock option activity and related information
Options, Granted	0	0	0
Options Outstanding, Ending Balance	400
Options Exercisable at Period End	400
Options, Weighted Average Exercise Price, Ending Balance	$ 29.99
Options, Weighted Average Exercise Price, Exercisable at Period End	$ 29.99
Stock Options Outstanding, Weighted Average Remaining Contractual Life	2 years 4 months 24 days
Stock Options Exercisable, Weighted Average Remaining Contractual Life	2 years 4 months 24 days
Proceeds from Stock Options Exercised	$ 5	$ 2
Tax benefits realized on options exercised	$ 2	$ 2
Employee Stock Purchase Plan [Member]
Equity-Based Compensation (Textuals) [Abstract]
Shares authorized for issuance	5,200
Shares available for future grants	700
No. of shares purchases by employees	240
Average price of shares purchased	$ 33.00