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Restructuring Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Charges recorded in restructuring expense | $ 0 | $ 2 |  |  |
Reversal of restructuring expense | (1) |  |  |  |
Sodium Chlorate Plant [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Cumulative restructuring expenses incurred to date | 4 |  |  |  |
Wyoming Restructure [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Cumulative restructuring expenses incurred to date | 1 |  |  |  |
Reduction in Employees [Member] | Sodium Chlorate Plant [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Charges recorded in restructuring expense |  |  |  |  | $ 4
Payments for restructuring |  | 2 |  | $ 1 | 1
Process Improvements [Member] | Wyoming Restructure [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Charges recorded in restructuring expense | 1 |  |  |  |
TiO2 Segment [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Charges recorded in restructuring expense | 0 | 1 |  |  |
Cumulative restructuring expenses incurred to date | $ 16 |  |  |  |
TiO2 Segment [Member] | Reduction in Employees and Outside Contractor Positions [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Charges recorded in restructuring expense |  |  |  |  | 14
Payments for restructuring |  | 11 | $ 3 |  | $ 2
TiO2 Segment [Member] | Reduction in Employees [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Charges recorded in restructuring expense |  | $ 2 |  |  |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition Amount of costs incurred to date for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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