Business Segments and Related Information (Details) $ in Millions		3 Months Ended
		Mar. 31, 2025 USD ($) Segment	Mar. 31, 2024 USD ($)
Business Segments [Abstract]
Number of reportable segments | Segment		4
Total segment gross operating margin		$ 2,464	$ 2,507
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]	(602)	(582)
Asset impairment charges in operating costs and expenses		(10)	(20)
Net gains attributable to asset sales and related matters in operating costs and expenses		2	0
General and administrative costs		(60)	(66)
Non-refundable payments received from shippers attributable to make-up rights	[2]	(37)	(25)
Subsequent recognition of revenues attributable to make-up rights	[3]	4	8
Total other expense, net	[4]	(331)	(318)
Income before income taxes		$ 1,430	$ 1,504

[1] Excludes amortization of major maintenance costs for reaction-based plants and amortization of finance lease right-of-use (“ROU”) assets, which are components 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.