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Summary of Significant Accounting Policies - Credit loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Allowance activity |  |
Allowance for doubtful accounts, beginning balance | $ 28 | $ 29
Additions charged to expense | 51 | 39
Accounts written-off, net of recoveries | (44) | (43)
Acquisitions, divestitures and other, net | (1) | 3
Allowance for doubtful accounts, ending balance | 33 | 28
Accounts receivable, net of allowance | 2,097 | 1,949
Total allowance increase (decrease) | $ 5 |
Receivables outstanding less than 60 days (as a percent) | 90.00% |
Threshold period to measure receivables | 60 days |
Notes and other receivables, current and noncurrent | $ 703 | 544
Allowance for notes and other receivables, current and noncurrent | $ 8 | $ 1
Receivables classified as current (as a percent) | 75.00% | 70.00%
Receivables related to income tax payments in excess of our provision for income taxes | $ 414 | $ 231
Federal Fuel Credits Receivable | 20 | 70
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) | $ (1)
Allowance for notes and other receivables, current and noncurrent | $ 4 |

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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=121593590&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=121566466&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=121593590&loc=d3e4531-111522 + Details
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