Hedging Activities and Fair Value Measurements (Details) bbl in Millions, $ in Millions, ft³ in Billions		1 Months Ended			12 Months Ended
		Jan. 31, 2024 USD ($)	Jan. 31, 2023 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) TWh ft³ bbl	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)	Jan. 02, 2024 USD ($)	Jan. 03, 2023 USD ($)
Derivative [Line Items]
Accumulated other comprehensive income					$ 307	$ 365	$ 286
Proceeds (payments) from the settlement of interest rate derivative instruments					21	0	75
Carrying amount of hedged asset					2	12
Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income					115	201	(946)
Interest Rate Derivatives [Member] | Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income					5	$ (19)	$ (38)
Designated as Hedging Instrument [Member] | Treasury Lock - Settled January 2024 [Member] | Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Proceeds (payments) from the settlement of interest rate derivative instruments		$ (29)
Designated as Hedging Instrument [Member] | Treasury Lock - Fourth Quarter 2023 [Member] | Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Notional Amount					$ 600
Credit-risk related contingent features in derivative instruments [Abstract]
Treasury rate, fixed rate					4.48%
Designated as Hedging Instrument [Member] | Treasury Lock - January 2024 A [Member] | Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Notional Amount									$ 400
Credit-risk related contingent features in derivative instruments [Abstract]
Treasury rate, fixed rate									3.97%
Designated as Hedging Instrument [Member] | Treasury Lock - January 2024 B [Member] | Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Notional Amount									$ 750
Credit-risk related contingent features in derivative instruments [Abstract]
Treasury rate, fixed rate									4.11%
Designated as Hedging Instrument [Member] | Treasury Lock [Member] | Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Notional Amount										$ 1,500
Proceeds (payments) from the settlement of interest rate derivative instruments			$ 21
Designated as Hedging Instrument [Member] | Forward Starting Swaps [Member] | Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Notional amount of settled derivative instruments				$ 1,100
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income				2
Cumulative gains on forward-starting swaps recognized in accumulated other comprehensive income				123
Proceeds (payments) from the settlement of interest rate derivative instruments				75
Designated as Hedging Instrument [Member] | Forward Starting Swaps A [Member] | Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Life of associated future debt							30 years
Accumulated other comprehensive income				99
Designated as Hedging Instrument [Member] | Forward Starting Swaps B [Member] | Derivatives in cash flow hedging relationships [Member]
Derivative [Line Items]
Accumulated other comprehensive income				$ 22
Designated as Hedging Instrument [Member] | Natural gas processing: Forecasted natural gas purchases for plant thermal reduction (PTR) [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | ft³	[1],[2]				7.1
Designated as Hedging Instrument [Member] | Natural gas processing: Forecasted sales of natural gas [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | ft³	[1],[2]				36.5
Designated as Hedging Instrument [Member] | Natural gas processing: Forecasted sales of NGLs [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				2.7
Designated as Hedging Instrument [Member] | Octane enhancement: Forecasted sales of octane enhancement products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				4.9
Designated as Hedging Instrument [Member] | Octane enhancement: Forecasted sales of octane enhancement products [Member] | Derivatives in cash flow hedging relationships [Member] | Long-term [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				0.4
Designated as Hedging Instrument [Member] | Natural gas marketing: Natural gas storage inventory management activities [Member] | Derivatives in fair value hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | ft³	[1],[2]				1.0
Designated as Hedging Instrument [Member] | NGL marketing: Forecasted purchases of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				71.5
Designated as Hedging Instrument [Member] | NGL marketing: Forecasted purchases of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member] | Long-term [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				3.1
Designated as Hedging Instrument [Member] | NGL marketing: Forecasted sales of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				65.3
Designated as Hedging Instrument [Member] | NGL marketing: Forecasted sales of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member] | Long-term [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				11.2
Designated as Hedging Instrument [Member] | Refined products marketing: Forecasted purchases of refined products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				1.2
Designated as Hedging Instrument [Member] | Refined products marketing: Forecasted purchases of refined products [Member] | Derivatives in cash flow hedging relationships [Member] | Long-term [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				0.1
Designated as Hedging Instrument [Member] | Crude oil marketing: Forecasted purchases of crude oil [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				16.1
Designated as Hedging Instrument [Member] | Crude oil marketing: Forecasted sales of crude oil [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				25.2
Designated as Hedging Instrument [Member] | Petrochemical marketing: Forecasted sales of petrochemical products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2]				0.1
Designated as Hedging Instrument [Member] | Commercial energy: Forecasted purchases of power related to asset operations [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | TWh	[1],[2]				1.4
Designated as Hedging Instrument [Member] | Commercial energy: Forecasted purchases of power related to asset operations [Member] | Derivatives in cash flow hedging relationships [Member] | Long-term [Member]
Derivative [Line Items]
Volume | TWh	[1],[2]				1.5
Not Designated as Hedging Instrument [Member] | Derivatives in mark-to-market relationships [Member]
Derivative [Line Items]
Mark-to-market loss in interest expense								$ (48)
Not Designated as Hedging Instrument [Member] | Natural gas risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | ft³	[1],[2],[3]				19.1
Not Designated as Hedging Instrument [Member] | NGL risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2],[3]				12.5
Not Designated as Hedging Instrument [Member] | NGL risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Long-term [Member]
Derivative [Line Items]
Volume | bbl	[1],[2],[3]				7.8
Not Designated as Hedging Instrument [Member] | Refined products risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2],[3]				5.1
Not Designated as Hedging Instrument [Member] | Crude oil risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Current [Member]
Derivative [Line Items]
Volume | bbl	[1],[2],[3]				102.5
Not Designated as Hedging Instrument [Member] | Crude oil risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Long-term [Member]
Derivative [Line Items]
Volume | bbl	[1],[2],[3]				25.2

[1] The maximum term for derivatives designated as cash flow hedges, derivatives designated as fair value hedges and derivatives not designated as hedging instruments is December 2025, February 2024 and December 2025, respectively.

[2] Volume for derivatives designated as hedging instruments reflects the total amount of volumes hedged whereas volume for derivatives not designated as hedging instruments reflects the absolute value of derivative notional volumes.

[3] Reflects the use of derivative instruments to manage risks associated with our transportation, processing and storage assets.