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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | VALUATION AND QUALIFYING ACCOUNTS SCHEDULE II NATIONAL OILWELL VARCO, INC. VALUATION AND QUALIFYING ACCOUNTS Years Ended December 31, 2011, 2010 and 2009 (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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 |  | $ | 107 |  |  | $ | 9 |  |  | $ | (9 | ) |  | $ | 107 |
2010 |  |  | 95 |  |  |  | 39 |  |  |  | (27 | ) |  |  | 107 |
2009 |  |  | 73 |  |  |  | 53 |  |  |  | (31 | ) |  |  | 95 |
Allowance for excess and obsolete inventories: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 |  | $ | 270 |  |  | $ | 70 |  |  | $ | (59 | ) |  | $ | 281 |
2010 |  |  | 206 |  |  |  | 106 |  |  |  | (42 | ) |  |  | 270 |
2009 |  |  | 123 |  |  |  | 100 |  |  |  | (17 | ) |  |  | 206 |
Valuation allowance for deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 |  | $ | 9 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 13 |
2010 |  |  | 8 |  |  |  | 1 |  |  |  | — |  |  |  | 9 |
2009 |  |  | 10 |  |  |  | — |  |  |  | (2 | ) |  |  | 8 |
Warranty reserve: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 |  | $ | 215 |  |  | $ | 40 |  |  | $ | (44 | ) |  | $ | 211 |
2010 |  |  | 217 |  |  |  | 52 |  |  |  | (54 | ) |  |  | 215 |
2009 |  |  | 114 |  |  |  | 144 |  |  |  | (41 | ) |  |  | 217 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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