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


	Three Months Ended March 31,
	2021		2020
Decrease (increase) in current assets:
Receivables, net	$	(2,946)	$	2,968
Inventories	175		627

Prepaid expenses and other	(24)		(8)
Increase (decrease) in current liabilities:
Accounts payable	2,992		(4,222)
Accrued expenses	105		(79)
Taxes other than income taxes payable	(144)		(241)
Income taxes payable	26		(152)
Changes in current assets and current liabilities	$	184	$	(1,107)

Changes in current assets and current liabilities for the three months ended March 31, 2021 were primarily due to the following:

•the increase in receivables was primarily due to an increase in commodity prices in March 2021 compared to December 2020 combined with an increase in sales volumes;

•the decrease in inventories was primarily due to lower inventory levels in March 2021 compared to December 2020; and

•the increase in accounts payable was due to an increase in commodity prices in March 2021 compared to December 2020 combined with an increase in crude oil and other feedstock volumes purchased.

Changes in current assets and current liabilities for the three months ended March 31, 2020 were primarily due to the following:

•the decrease in receivables was due to (i) a decrease of $3.4 billion as a result of a decrease in commodity prices in March 2020 compared to December 2019 combined with a decrease in sales volumes and (ii) an increase in income taxes receivable of $430 million primarily due to the recognition of the current portion of the income tax benefit described in Note 8;

•the decrease in inventories was due to a decrease in commodity prices in March 2020 compared to December 2019 combined with lower inventory levels;

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

•the decrease in taxes other than income taxes payable was mainly due to the payment of ad valorem, value-added, and motor fuel taxes.


	Three Months Ended March 31,
	2021		2020
Interest paid in excess of amount capitalized, including interest on finance leases	$	103	$	88
Income taxes paid, net	36		121

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


	Three Months Ended March 31,
	2021				2020
	Operating Leases		Finance Leases		Operating Leases		Finance Leases
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows	$	100	$	18	$	106	$	22

Financing cash flows	—		31		—		15
Changes in lease balances resulting from new and modified leases (a)	72		7		92		1,441

(a)Noncash activity for the three months ended March 31, 2020 primarily included $1.4 billion for a finance lease right-of-use asset and related liability recognized in connection with the terminaling agreement with MVP.