Business Segments and Related Information (Details) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) Segment	Jun. 30, 2021 USD ($)
Business Segments [Abstract]
Number of reportable segments | Segment				4
Gross Operating Margin
Operating income		$ 1,764	$ 1,492	$ 3,430	$ 3,187
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]	531	500	1,045	995
Asset impairment charges in operating costs and expenses		5	18	19	84
Net losses attributable to asset sales and related matters in operating costs and expenses		0	0	2	11
General and administrative costs		62	52	124	108
Non-refundable payments received from shippers attributable to make-up rights	[2]	39	22	73	41
Subsequent recognition of revenues attributable to make-up rights	[3]	(17)	(39)	(45)	(78)
Total segment gross operating margin		$ 2,384	$ 2,045	$ 4,648	$ 4,348

[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.