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Supplemental Cash Flow Information (Tables) | 9 Months Ended
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Sep. 30, 2021
Supplemental Cash Flow Information [Abstract] |
Schedule of cash flows, supplemental disclosures | 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,
| 2021 |  | 2020
Decrease (increase) in current assets: |  |  |
Receivables, net | $ | (2,643) |  |  | $ | 3,229 |
Inventories | (232) |  |  | 1,577 |
Prepaid expenses and other | 28 |  |  | 70 |
Increase (decrease) in current liabilities: |  |  |
Accounts payable | 3,624 |  |  | (4,893) |
Accrued expenses | 538 |  |  | 17 |
Taxes other than income taxes payable | 200 |  |  | (24) |
Income taxes payable | 115 |  |  | (208) |
Changes in current assets and current liabilities | $ | 1,630 |  |  | $ | (232) |
Cash flows related to interest and income taxes were as follows (in millions):
| Nine Months Ended September 30,
| 2021 |  | 2020
Interest paid in excess of amount capitalized, including interest on finance leases | $ | 397 |  |  | $ | 338 |
Income taxes paid (refunded), net | (876) |  |  | 206 |
Supplemental cash flow information related to our operating and finance leases was as follows (in millions):
| Nine Months Ended September 30,
| 2021 |  | 2020
| Operating Leases |  | Finance Leases |  | Operating Leases |  | Finance Leases
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |  |
Operating cash flows | $ | 296 |  |  | $ | 53 |  |  | $ | 329 |  |  | $ | 74 |
Investing cash flows | 1 |  |  | — |  |  | 1 |  |  | — |
Financing cash flows | — |  |  | 97 |  |  | — |  |  | 51 |
Changes in lease balances resulting from new and modified leases (a) | 366 |  |  | 93 |  |  | 211 |  |  | 1,506 |
________________________ (a)Noncash activity for the nine months ended September 30, 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.

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