Business Segments and Related Information (Details) $ in Millions		3 Months Ended
		Mar. 31, 2024 USD ($) Segment	Mar. 31, 2023 USD ($)
Business Segments [Abstract]
Number of reportable segments | Segment		4
Gross Operating Margin
Operating income		$ 1,822	$ 1,734
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]	582	533
Asset impairment charges in operating costs and expenses		20	13
Net gains attributable to asset sales and related matters in operating costs and expenses		0	(2)
General and administrative costs		66	57
Non-refundable payments received from shippers attributable to make-up rights	[2]	25	27
Subsequent recognition of revenues attributable to make-up rights	[3]	(8)	(20)
Total segment gross operating margin		$ 2,507	$ 2,342

[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.