Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair value of financial assets and liabilities measured on recurring basis

The following tables present information (in millions) about our assets and liabilities recognized at their fair values in our balance sheets categorized according to the fair value hierarchy of the inputs utilized by us to determine the fair values as of December 31, 2023 and 2022.

We have elected to offset the fair value amounts recognized for multiple similar derivative contracts executed with the same counterparty, including any related cash collateral assets or obligations as shown below; however, fair value amounts by hierarchy level are presented in the following tables on a gross basis. We have no derivative contracts that are subject to master netting arrangements that are reflected gross in our balance sheets.


	December 31, 2023
							Total Gross Fair Value		Effect of Counter- party Netting		Effect of Cash Collateral Netting		Net Carrying Value on Balance Sheet		Cash Collateral Paid or Received Not Offset
	Fair Value Hierarchy
	Level 1		Level 2		Level 3
Assets
Commodity derivative contracts	$	803	$	—	$	—	$	803	$	(642)	$	(66)	$	95	$	—


Investments of certain benefit plans	76		—		4		80		n/a		n/a		80		n/a
Investments in AFS debt securities	36		75		—		111		n/a		n/a		111		n/a
Total	$	915	$	75	$	4	$	994	$	(642)	$	(66)	$	286

Liabilities
Commodity derivative contracts	$	643	$	—	$	—	$	643	$	(642)	$	(1)	$	—	$	(67)
Blending program obligations	—		58		—		58		n/a		n/a		58		n/a
Physical purchase contracts	—		6		—		6		n/a		n/a		6		n/a
Foreign currency contracts	7		—		—		7		n/a		n/a		7		n/a
Total	$	650	$	64	$	—	$	714	$	(642)	$	(1)	$	71


	December 31, 2022
							Total Gross Fair Value		Effect of Counter- party Netting		Effect of Cash Collateral Netting		Net Carrying Value on Balance Sheet		Cash Collateral Paid or Received Not Offset
	Fair Value Hierarchy
	Level 1		Level 2		Level 3
Assets
Commodity derivative contracts	$	830	$	—	$	—	$	830	$	(705)	$	(8)	$	117	$	—
Physical purchase contracts	—		4		—		4		n/a		n/a		4		n/a

Investments of certain benefit plans	72		—		6		78		n/a		n/a		78		n/a
Investments in AFS debt securities	56		165		—		221		n/a		n/a		221		n/a
Total	$	958	$	169	$	6	$	1,133	$	(705)	$	(8)	$	420

Liabilities
Commodity derivative contracts	$	705	$	—	$	—	$	705	$	(705)	$	—	$	—	$	(149)
Blending program obligations	—		55		—		55		n/a		n/a		55		n/a
Physical purchase contracts	—		4		—		4		n/a		n/a		4		n/a
Foreign currency contracts	2		—		—		2		n/a		n/a		2		n/a
Total	$	707	$	59	$	—	$	766	$	(705)	$	—	$	61

Carrying amounts and estimated fair value of financial instruments

The estimated fair values of cash and cash equivalents, receivables, payables, and operating and finance lease obligations approximate their carrying amounts; the carrying value and fair value of debt is shown in the table below (in millions).


		December 31, 2023				December 31, 2022
	Fair Value Hierarchy	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial liabilities:
Debt (excluding finance lease obligations)	Level 2	$	9,218	$	9,109	$	9,241	$	8,902