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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | Valuation and Qualifying Accounts
| Balance at Beginning of Period |  | Provision |  | Other |  | Write-offs/ Disposition |  | Balance at End of Period
(in millions) |  |  |  |  |  |  |  |  |
Reserve for Expected Credit Losses: |  |  |  |  |  |  |  |  |
Year Ended December 31, 2020 | $ | 29 |  |  | $ | 17 |  |  | $ | — |  |  | $ | (10) |  |  | $ | 36 |
Year Ended December 31, 2019 | 27 |  |  | 11 |  |  | — |  |  | (9) |  |  | 29 |
Year Ended December 31, 2018 | 33 |  |  | 37 |  |  | (2) |  |  | (41) |  |  | 27 |
| Balance at Beginning of Period |  | Provision |  | Other |  | Write-offs/ Disposition |  | Balance at End of Period
(in millions) |  |  |  |  |  |  |  |  |
Inventory Reserves: (including excess, obsolescence and shrink reserves) |  |  |  |  |  |  |  |  |
Year Ended December 31, 2020 | $ | 78 |  |  | $ | 68 |  |  | $ | 2 |  |  | $ | (66) |  |  | $ | 82 |
Year Ended December 31, 2019 | 84 |  |  | 56 |  |  | — |  |  | (62) |  |  | 78 |
Year Ended December 31, 2018 | 75 |  | 54 |  | (2) |  |  | (43) |  |  | 84
| Balance at Beginning of Period |  | Provision |  | Other |  | Write-offs/ Recoveries |  | Balance at End of Period
(in millions) |  |  |  |  |  |  |  |  |
Income Tax Valuation Allowance |  |  |  |  |  |  |  |  |
Year Ended December 31, 2020 | $ | 271 |  |  | $ | 30 |  |  | $ | 5 |  |  | $ | (93) |  |  | $ | 213 |
Year Ended December 31, 2019 | 195 |  |  | 122 |  |  | (1) |  |  | (45) |  |  | 271 |
Year Ended December 31, 2018 | 293 |  |  | 14 |  |  | (27) |  |  | (85) |  |  | 195 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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