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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
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, 2021 and 2020. 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 on the balance sheet.
| December 31, 2021
|  |  |  |  |  |  | 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 | $ | 522 |  |  | $ | — |  |  | $ | — |  |  | $ | 522 |  |  | $ | (444) |  |  | $ | (15) |  |  | $ | 63 |  |  | $ | — |
Physical purchase contracts | — |  |  | 4 |  |  | — |  |  | 4 |  |  | n/a |  | n/a |  | 4 |  |  | n/a
Foreign currency contracts | 1 |  |  | — |  |  | — |  |  | 1 |  |  | n/a |  | n/a |  | 1 |  |  | n/a
Investments of certain benefit plans | 83 |  |  | — |  |  | 6 |  |  | 89 |  |  | n/a |  | n/a |  | 89 |  |  | n/a
Total | $ | 606 |  |  | $ | 4 |  |  | $ | 6 |  |  | $ | 616 |  |  | $ | (444) |  |  | $ | (15) |  |  | $ | 157 |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | 472 |  |  | $ | — |  |  | $ | — |  |  | $ | 472 |  |  | $ | (444) |  |  | $ | (28) |  |  | $ | — |  |  | $ | (41) |
Blending program obligations | — |  |  | 57 |  |  | — |  |  | 57 |  |  | n/a |  | n/a |  | 57 |  |  | n/a
Physical purchase contracts | — |  |  | 5 |  |  | — |  |  | 5 |  |  | n/a |  | n/a |  | 5 |  |  | n/a
Foreign currency contracts | 10 |  |  | — |  |  | — |  |  | 10 |  |  | n/a |  | n/a |  | 10 |  |  | n/a
Total | $ | 482 |  |  | $ | 62 |  |  | $ | — |  |  | $ | 544 |  |  | $ | (444) |  |  | $ | (28) |  |  | $ | 72 |  |  |
| December 31, 2020
|  |  | 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 | $ | 403 |  |  | $ | — |  |  | $ | — |  |  | $ | 403 |  |  | $ | (373) |  |  | $ | (18) |  |  | $ | 12 |  |  | $ | — |
Physical purchase contracts | — |  |  | 13 |  |  | — |  |  | 13 |  |  | n/a |  | n/a |  | 13 |  |  | n/a
Investments of certain benefit plans | 74 |  |  | — |  |  | 8 |  |  | 82 |  |  | n/a |  | n/a |  | 82 |  |  | n/a
Total | $ | 477 |  |  | $ | 13 |  |  | $ | 8 |  |  | $ | 498 |  |  | $ | (373) |  |  | $ | (18) |  |  | $ | 107 |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts | $ | 405 |  |  | $ | — |  |  | $ | — |  |  | $ | 405 |  |  | $ | (373) |  |  | $ | (32) |  |  | $ | — |  |  | $ | (44) |
Blending program obligations | — |  |  | 96 |  |  | — |  |  | 96 |  |  | n/a |  | n/a |  | 96 |  |  | n/a
Foreign currency contracts | 4 |  |  | — |  |  | — |  |  | 4 |  |  | n/a |  | n/a |  | 4 |  |  | n/a
Total | $ | 409 |  |  | $ | 96 |  |  | $ | — |  |  | $ | 505 |  |  | $ | (373) |  |  | $ | (32) |  |  | $ | 100 |  |  |
Carrying amounts and estimated fair value of financial instruments | Financial instruments that we recognize in our balance sheets at their carrying amounts are shown in the following table along with their associated fair values (in millions):
|  |  | December 31, 2021 |  | December 31, 2020
| Fair Value Hierarchy |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | Level 1 |  | $ | 4,122 |  |  | $ | 4,122 |  |  | $ | 3,313 |  |  | $ | 3,313 |
Financial liabilities: |  |  |  |  |  |  |  |  |
Debt (excluding finance leases) | Level 2 |  | 11,950 |  |  | 13,668 |  |  | 13,013 |  |  | 15,103 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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