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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Trade accounts receivable |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 71 | $ 76 | $ 83
Charged to costs and expense | (6) | 0 | 9
Charged to other accounts | (4) | 6 | (1)
Acquisitions | 7 | 0 | 0
Deductions – write-offs | (3) | (11) | (15)
Balance at end of period | 65 | 71 | 76
Deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 228 | 225 | 241
Charged to costs and expense | (1) | 9 | (14)
Charged to other accounts | (7) | 0 | 2
Acquisitions | 76 | 0 | 0
Deductions – write-offs | (14) | (6) | (4)
Balance at end of period | $ 282 | $ 228 | $ 225

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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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