Business Segments and Related Information (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Segment	Jun. 30, 2022 USD ($)
Business Segments [Abstract]
Number of reportable segments | Segment				4
Gross Operating Margin
Operating income		$ 1,579	$ 1,764	$ 3,313	$ 3,430
Adjustments to reconcile operating income to total segment gross operating margin (addition or subtraction indicated by sign):
Depreciation, amortization and accretion expense in operating costs and expenses	[1]	545	531	1,078	1,045
Asset impairment charges in operating costs and expenses		3	5	16	19
Net losses (gains) attributable to asset sales and related matters in operating costs and expenses		(2)	0	(4)	2
General and administrative costs		56	62	113	124
Non-refundable payments received from shippers attributable to make-up rights	[2]	(3)	39	24	73
Subsequent recognition of revenues attributable to make-up rights	[3]	(25)	(17)	(45)	(45)
Total segment gross operating margin		$ 2,153	$ 2,384	$ 4,495	$ 4,648

[1] Excludes amortization of major maintenance costs for reaction-based plants, which are a component of gross operating margin.

[2] Since make-up rights entail a future performance obligation by the pipeline to the shipper, these receipts are recorded as deferred revenue for GAAP purposes; however, these receipts are included in gross operating margin in the period of receipt since they are nonrefundable to the shipper.

[3] As deferred revenues attributable to make-up rights are subsequently recognized as revenue under GAAP, gross operating margin must be adjusted to remove such amounts to prevent duplication since the associated non-refundable payments were previously included in gross operating margin.