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Summary of Significant Accounting Policies - Credit loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Allowance activity |  |
Allowance for doubtful accounts, beginning balance | $ 33 | $ 28
Additions charged to expense | 35 | 51
Accounts written-off, net of recoveries | (36) | (44)
Acquisitions, divestitures and other, net | (7) | (1)
Allowance for doubtful accounts, ending balance | 25 | 33
Accounts receivable, net of allowance | $ 2,278 | $ 2,097
Receivables outstanding less than 60 days (as a percent) | 90.00% | 90.00%
Threshold period to measure receivables | 60 days | 60 days
Notes and other receivables, current and noncurrent | $ 451 | $ 703
Allowance for notes and other receivables, current and noncurrent | $ 10 | $ 8
Receivables classified as current (as a percent) | 60.00% | 75.00%
Receivables related to income tax payments in excess of our provision for income taxes | $ 166 | $ 414
Federal Fuel Credits Receivable | 14 | 20
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |
Allowance activity |  |
Allowance for doubtful accounts, beginning balance | $ (1) |
Allowance for doubtful accounts, ending balance |  | $ (1)

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4531-111522 + Details
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