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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2019
Schedule II - Valuation and Qualifying Accounts |
Schedule II - Valuation and Qualifying Accounts | Transocean Ltd. and Subsidiaries Schedule II - Valuation and Qualifying Accounts (In millions)
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​ | ​ | Balance at | ​ | Charge to cost | ​ | other | ​ | ​ | ​ | ​ | Balance at |
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Year ended December 31, 2017 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reserves and allowances deducted from asset accounts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for excess and obsolete materials and supplies | ​ | ​ | 153 | ​ | ​ | 24 | ​ | ​ | — | ​ | ​ | 36 | (a) | ​ | 141 | ​
Valuation allowance on deferred tax assets | ​ | ​ | 412 | ​ | ​ | 162 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 574 | ​
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Year ended December 31, 2018 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reserves and allowances deducted from asset accounts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for excess and obsolete materials and supplies | ​ | ​ | 141 | ​ | ​ | 12 | ​ | ​ | — | ​ | ​ | 19 | (a) | ​ | 134 | ​
Valuation allowance on deferred tax assets | ​ | ​ | 574 | ​ | ​ | 67 | ​ | ​ | 40 | (b) | ​ | — | ​ | ​ | 681 | ​
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Year ended December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reserves and allowances deducted from asset accounts: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for excess and obsolete materials and supplies | ​ | ​ | 134 | ​ | ​ | 3 | ​ | ​ | — | ​ | ​ | 10 | (a) | ​ | 127 | ​
Valuation allowance on deferred tax assets | ​ | ​ | 681 | ​ | ​ | 37 | ​ | ​ | — | ​ | ​ | 2 | (c) | ​ | 716 | ​
(a) | Amount related to materials and supplies on rigs and related assets sold or classified as held for sale.
(b) | Amount primarily related to the following: (i) adjustments of $26 million to the valuation allowance and related deferred tax assets with corresponding adjustments to retained earnings associated with our adoption of the accounting standards update that requires an entity to recognize in the period in which it occurs the income tax consequences of an intra entity transfer of an asset other than inventory and (ii) an adjustment of $14 million to the valuation allowance related to deferred tax assets acquired in business combinations.
(c) | Amount related to adjustments to other deferred tax assets with valuation allowances.

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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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