The following table summarizes Devon's other expenses (income) presented in the accompanying consolidated comprehensive statement of earnings.


	Three Months Ended June 30,					Six Months Ended June 30,
	2022		2021			2022			2021
Estimated future obligation under a performance guarantee	$	—	$	(18	)	$	(96	)	$	(18	)
Ukraine charitable pledge		—		—			20			—
Asset retirement obligation accretion		6		7			13			14
Severance and other non-income tax refunds		—		(3	)		(3	)		(39	)
Other		4		—			15			—
Total	$	10	$	(14	)	$	(51	)	$	(43	)

The first six months of 2022 includes a $96 million benefit related to the revision of a future obligation under a performance guarantee liability for previously divested assets. Due to improved commodity prices and market conditions, the purchaser of these assets was able to fully satisfy a $35 million obligation due in the first quarter of 2022. Further, during the first quarter of 2022, Devon also reduced the estimated future exposure of the performance guarantee by $61 million based on probability-weighted cash flows for the remainder of the contract term of four years. Additionally, the first six months of 2021 included an $18 million benefit related to the revision of a future obligation under a performance guarantee liability for which the purchaser of these assets was able to partially satisfy an obligation.

The first six months of 2022 also includes a $20 million pledge for humanitarian relief for the Ukrainian people and surrounding countries supporting refugees.

During the first six months of 2021, Devon received severance and other non-income tax refunds of $39 million.