Business Segments, Gross Operating Margin (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Segments [Abstract]
Operating income		$ 6,929	$ 6,907	$ 6,103
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]	2,215	2,107	2,011
Asset impairment charges in operating costs and expenses		30	53	233
Net losses (gains) attributable to asset sales and related matters in operating costs and expenses		(10)	1	5
General and administrative costs		231	241	209
Non-refundable payments received from shippers attributable to make-up rights	[2]	52	144	85
Subsequent recognition of revenues attributable to make-up rights	[3]	(71)	(97)	(138)
Total segment gross operating margin		$ 9,376	$ 9,356	$ 8,508

[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.