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Restructuring Costs (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs | $ 0 | $ 5,000,000 | $ 5,000,000 | $ 38,000,000 |
IT Restructuring |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring costs | 15,000,000 |  | 15,000,000 |  |
Decrease to estimated expected costs remaining |  |  | 20,000,000 |  |
Accrued liabilities under restructuring plan | 0 |  | 0 |  | $ 6,000,000
Restructuring costs |  |  | 2,000,000 |  |
Cumulative restructuring costs | 11,000,000 |  | 11,000,000 |  |
2017 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Accrued liabilities under restructuring plan |  |  |  |  | $ 18,000,000
One-Time Termination Benefits | IT Restructuring |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | 5,000,000 |  |
Cumulative restructuring costs | 7,000,000 |  | 7,000,000 |  |
Consulting Fees | IT Restructuring |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | 3,000,000 |  |
Cumulative restructuring costs | 4,000,000 |  | 4,000,000 |  |
Other Restructuring Costs | 2017 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  | 3,000,000 |  |
Contract Termination | 2017 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Accrued liabilities under restructuring plan | $ 14,000,000 |  | 14,000,000 |  |
Restructuring costs |  |  | $ 7,000,000 |  |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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