In order to determine net cash provided by operating activities, net income (loss) is adjusted by, among other things, changes in current assets and current liabilities as follows (in millions):


	Nine Months Ended September 30,
	2020		2019
Decrease (increase) in current assets:
Receivables, net	$	3,229	$	(241)
Inventories	1,577		126

Prepaid expenses and other	70		(55)
Increase (decrease) in current liabilities:
Accounts payable	(4,893)		914
Accrued expenses	17		(92)
Taxes other than income taxes payable	(24)		(25)
Income taxes payable	(208)		101
Changes in current assets and current liabilities	$	(232)	$	728

Changes in current assets and current liabilities for the nine months ended September 30, 2020 were as follows:

•the decrease in receivables was due to (i) a decrease of $3.6 billion as a result of a decrease in sales volumes combined with a decrease in commodity prices in September 2020 compared to December 2019, (ii) the collection of $449 million for a blender’s tax credit receivable attributable to volumes blended during 2019 and 2018, and (iii) an increase in income taxes receivable of $770 million primarily due to the recognition of a current income tax benefit;

•the decrease in inventories was primarily due to lower inventory levels in September 2020 compared to December 2019; and

•the decrease in accounts payable was due to a decrease in crude oil and other feedstock volumes purchased combined with a decrease in commodity prices in September 2020 compared to December 2019.

Changes in current assets and current liabilities for the nine months ended September 30, 2019 were as follows:

•the increase in receivables was due to an increase in commodity prices in September 2019 compared to December 2018 combined with an increase in sales volumes, partially offset by an income tax refund of $348 million, including interest, associated with the settlement of the combined audit related to our U.S. federal income tax returns for 2010 and 2011;

•the decrease in inventories was due to lower inventory levels in September 2019 compared to December 2018; and

•the increase in accounts payable was due to an increase in commodity prices in September 2019 compared to December 2018 combined with an increase in crude oil and other feedstock volumes purchased and the timing of payments of invoices.


	Nine Months Ended September 30,
	2020		2019
Interest paid in excess of amount capitalized, including interest on finance leases	$	338	$	303
Income taxes paid (refunded), net	206		(184)

Supplemental cash flow information related to our operating and finance leases was as follows (in millions):


	Nine Months Ended September 30,
	2020				2019
	Operating Leases		Finance Leases		Operating Leases		Finance Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows	$	329	$	74	$	329	$	38
Investing cash flows	1		—		1		—
Financing cash flows	—		51		—		31
Changes in lease balances resulting from new and modified leases (a)	211		1,506		1,673		221

(a)Noncash activity for the nine months ended September 30, 2020 primarily includes $1.4 billion for a finance lease ROU asset and related liability recognized in connection with the terminaling agreement with MVP described in Note 5. Noncash activity for the nine months ended September 30, 2019 included $1.3 billion for operating lease ROU assets and related liabilities recorded on January 1, 2019 upon adoption of Financial Accounting Standards Board Accounting Standards Codification Topic 842, “Leases.”

There were no significant noncash investing and financing activities during the nine months ended September 30, 2020, except as noted in the table above.

Noncash investing and financing activities during the nine months ended September 30, 2019 included the derecognition of the property, plant, and equipment and the related long-term liability associated with a build-to-suit lease arrangement with respect to the MVP Terminal, and the subsequent recognition of our investment in MVP, in addition to the activities noted in the table above.