EBP Asset rollforward and B.S. classification (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Amounts included in regulatory liabilities associated with Transco and Northwest Pipeline:
Net regulatory liabilities	$ 130	$ 150
Pension Benefits [Member]
Change in plan assets:
Fair value of plan assets at beginning of year	1,336	1,357
Actual return on plan assets	(132)	62
Employer contributions	3	4
Plan participants’ contributions	0	0
Benefits paid	(78)	(83)
Settlements	(12)	(4)
Net increase (decrease) in fair value of plan assets	(219)	(21)
Fair value of plan assets at end of year	1,117	1,336
Funded status — overfunded (underfunded)	177	203
Amounts recognized in the Consolidated Balance Sheet:
Noncurrent assets	201	229
Current liabilities	(2)	(3)
Noncurrent liabilities	(22)	(23)
Funded status - overfunded (underfunded)	177	203
Accumulated benefit obligation	930	1,118
Plans with a projected benefit obligation in excess of plan assets:
Projected benefit obligation	24	26
Plans with an accumulated benefit obligation in excess of plan assets:
Accumulated benefit obligation	22	22
Fair value of plan assets	0	0
Amounts recognized in Accumulated other comprehensive income (loss):
Net actuarial gain (loss)	(45)	(46)
Other Postretirement Benefits [Member]
Change in plan assets:
Fair value of plan assets at beginning of year	287	278
Actual return on plan assets	(27)	16
Employer contributions	3	5
Plan participants’ contributions	2	2
Benefits paid	(12)	(14)
Settlements	0	0
Net increase (decrease) in fair value of plan assets	(34)	9
Fair value of plan assets at end of year	253	287
Funded status — overfunded (underfunded)	101	87
Amounts recognized in the Consolidated Balance Sheet:
Noncurrent assets	105	91
Current liabilities	(4)	(4)
Noncurrent liabilities	0	0
Funded status - overfunded (underfunded)	101	87
Amounts recognized in Accumulated other comprehensive income (loss):
Net actuarial gain (loss)	$ 18	$ 4