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Discontinued Operations Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 04, 2017 | Nov. 22, 2017 | Sep. 28, 2017 | Mar. 31, 2016 | Sep. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 24, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distribution Date | Dec. 04, 2017 |  |  |  |  |  |  |  |  |  |
Record Date |  | Nov. 22, 2017 |  |  |  |  |  |  |  |  |
Dividend from Delphi Technologies Spin-Off |  |  |  |  |  |  | $ 0 | $ 1,148 | $ 0 |  |
Cash transferred from Delphi Technologies related to spin-off |  |  |  |  |  |  | 0 | 180 | 0 |  |
Net proceeds from divestiture of discontinued operations |  |  |  |  |  |  | 0 | 0 | 48 |  |
Gain (loss) on divestiture of discontinued operations, net of tax |  |  |  |  |  |  |  | 0 | 104 |  |
Post-Closing Adjustments to Prior Period Gain on Divestiture |  |  |  |  |  |  |  | 0 | (3) |  |
Accounts receivable to be remitted to Delphi Technologies |  |  |  |  |  |  | 7 | 123 |  |  |
Accounts payable to be remitted on behalf of Delphi Technologies |  |  |  |  |  |  | 4 | 132 |  |  |
KDAC |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
KDAC Ownership Percentage, Classified as Discontinued Operations |  |  |  |  |  |  |  |  |  |  | 50.00%
SDAAC |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
SDAAC Ownership Percentage, Classified as Discontinued Operations |  |  |  | 50.00% |  |  |  |  |  |  |
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Separation Costs |  |  |  |  |  |  |  | $ 118 |  |  |
Powertrain Systems [Member] | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] | Other income (expense), net |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Transition Services Agreement Fees |  |  |  |  |  |  | $ 11 |  |  |  |
Thermal Systems | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of discontinued operations |  |  |  |  |  |  |  |  |  | $ 670 |
Gain (loss) on divestiture of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | $ 271 |
Gain (loss) on divestiture of discontinued operations, net of tax, per share |  |  |  |  |  |  |  |  |  | $ 0.95 |
Tax effect of gain on divestiture of discontinued operations |  |  |  |  |  |  |  |  |  | $ 52 |
Transaction costs |  |  |  |  |  |  |  |  |  | 10 |
Post-Closing Adjustments |  |  |  |  |  |  |  |  |  | 18 |
Thermal Systems | Discontinued Operations, Disposed of by Sale | KDAC |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from divestiture of discontinued operations |  |  |  |  | $ 70 |  |  |  |  |  |
Gain (loss) on divestiture of discontinued operations, net of tax |  |  |  |  | $ 47 |  |  |  |  | (41) |
Gain (loss) on divestiture of discontinued operations, net of tax, per share |  |  |  |  | $ (0.14) |  |  |  |  |  |
Impairment loss on KDAC interest |  |  |  |  |  | $ 88 |  |  |  |  |
Impairment of KDAC interest, Per Share |  |  |  |  |  | $ 0.30 |  |  |  |  |
Fair value of KDAC interest |  |  |  |  |  | $ 32 |  |  |  |  |
Thermal Systems | Discontinued Operations, Disposed of by Sale | SDAAC |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from divestiture of discontinued operations |  |  |  |  |  |  |  |  | 62 |  |
Gain (loss) on divestiture of discontinued operations, net of tax |  |  |  |  |  |  |  |  | $ 104 |  |
Gain (loss) on divestiture of discontinued operations, net of tax, per share |  |  |  |  |  |  |  |  | $ 0.38 |  |
Tax effect of gain on divestiture of discontinued operations |  |  |  |  |  |  |  |  | $ 10 |  |
Cash divested |  |  |  |  |  |  |  |  | 29 |  |
Thermal Systems | Discontinued Operations, Disposed of by Sale | Other income (expense), net |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Transition Services Agreement Fees |  |  |  |  |  |  |  |  | $ 8 | $ 8 |
Delphi Technologies Debt |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 1,550 |  |  |  |  |  |  |  |  |  |
Delphi Technologies Tranche A Term Loan |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans Payable | $ 750 |  |  |  |  |  |  |  |  |  |
Senior Notes | Delphi Technologies Senior Notes, 5.000% Due 2025 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 800 |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  | Oct. 01, 2025 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.00% |  |  |  |  |  |  |  |

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