Business Segments and Related Information, Gross Operating Margin (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Segments [Abstract]
Total segment gross operating margin		$ 10,018	$ 9,376	$ 9,356
Adjustments to reconcile total segment gross operating margin to income before income taxes (addition or subtraction indicated by sign):
Depreciation, amortization and accretion expense in operating costs and expenses	[1]	(2,343)	(2,215)	(2,107)
Asset impairment charges in operating costs and expenses		(57)	(30)	(53)
Net gains (losses) attributable to asset sales and related matters in operating costs and expenses		(2)	10	(1)
General and administrative costs		(244)	(231)	(241)
Non-refundable payments received from shippers attributable to make-up rights	[2]	(75)	(52)	(144)
Subsequent recognition of revenues attributable to make-up rights	[3]	41	71	97
Total other expense, net	[4]	(1,303)	(1,228)	(1,210)
Income before income taxes		$ 6,035	$ 5,701	$ 5,697

[1] Excludes amortization of major maintenance costs for reaction-based plants and amortization of finance lease right-of-use assets, 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.

[4] As presented on our Statements of Consolidated Operations, Total other expense, net is comprised of Interest expense, Interest income and Other, net.