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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for excess and obsolete materials and supplies |  |  |
Reserves and allowances deducted from asset accounts |  |  |
Balance at the beginning of the period | $ 134 | $ 141 | $ 153
Charge to cost and expenses | 3 | 12 | 24
Deductions | 10 | 19 | 36
Balance at the end of the period | 127 | 134 | 141
Valuation allowance on deferred tax assets |  |  |
Reserves and allowances deducted from asset accounts |  |  |
Balance at the beginning of the period | 681 | 574 | 412
Charge to cost and expenses | 37 | 67 | 162
Charge to other accounts |  | 40 |
Deductions | 2 |  |
Balance at the end of the period | $ 716 | 681 | $ 574
Valuation allowance adjustment |  | 26 |
Valuation allowance in business combination |  | $ 14 |

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: 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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