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Schedule II National Oilwell Varco, Inc. Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2019
Valuation And Qualifying Accounts [Abstract] |
Schedule II National Oilwell Varco, Inc. Valuation and Qualifying Accounts | SCHEDULE II NATIONAL OILWELL VARCO, INC. VALUATION AND QUALIFYING ACCOUNTS Years Ended December 31, 2019, 2018 and 2017 (in millions)
|  | Balance beginning of year |  |  | Additions (Deductions) charged to costs and expenses |  |  | Charge off's and other |  |  | Balance end of year |
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  | $ | 161 |  |  | $ | 21 |  |  | $ | (50 | ) |  | $ | 132 |
2018 |  |  | 187 |  |  |  | 17 |  |  |  | (43 | ) |  |  | 161 |
2017 |  |  | 209 |  |  |  | 6 |  |  |  | (28 | ) |  |  | 187 |
Reserve for excess and obsolete inventories: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  | $ | 644 |  |  | $ | 659 |  |  | $ | (460 | ) |  | $ | 843 |
2018 |  |  | 800 |  |  |  | 49 |  |  |  | (205 | ) |  |  | 644 |
2017 |  |  | 1,017 |  |  |  | 114 |  |  |  | (331 | ) |  |  | 800 |
Valuation allowance for deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  | $ | 955 |  |  | $ | 218 |  |  | $ | 2 |  |  | $ | 1,175 |
2018 |  |  | 1,202 |  |  |  | 49 |  |  |  | (296 | ) |  |  | 955 |
2017 |  |  | 544 |  |  |  | 280 |  |  |  | 378 |  |  |  | 1,202 |
Environmental accruals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  | $ | 66 |  |  | $ | 57 |  |  | $ | (19 | ) |  | $ | 104 |
2018 |  |  | 38 |  |  |  | 37 |  |  |  | (9 | ) |  |  | 66 |
2017 |  |  | 43 |  |  |  | 2 |  |  |  | (7 | ) |  |  | 38 |
Warranty reserve: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  | $ | 105 |  |  | $ | 41 |  |  | $ | (56 | ) |  | $ | 90 |
2018 |  |  | 135 |  |  |  | 38 |  |  |  | (68 | ) |  |  | 105 |
2017 |  |  | 172 |  |  |  | 46 |  |  |  | (83 | ) |  |  | 135 |

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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=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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