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Pension Benefits Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair Value of Plan Assets at beginning of year | $ 377 |  |
Fair Value of Plan Assets at end of year | 362 | $ 377 |
Liability, Defined Benefit Plan [Abstract] |  |  |
Pension and Other Postretirement Defined Benefit Plans, Non-current Liabilities | (445) | (454) |
Domestic Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 29 | 40 |
Interest Cost | 1 | 1 | $ 1
Actuarial Loss (Gain) | 2 | 0 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (10) | (12) |
Benefit obligation at end of year | 18 | 29 | 40
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair Value of Plan Assets at beginning of year | 0 | 0 |
Aptiv contributions | 10 | 12 |
Benefits Paid | 10 | 12 |
Fair Value of Plan Assets at end of year | 0 | 0 | 0
Defined Benefit Plan, Underfunded Status | (18) | (29) |
Liability, Defined Benefit Plan [Abstract] |  |  |
Liability, Defined Benefit Plan, Current | (7) | (10) |
Pension and Other Postretirement Defined Benefit Plans, Non-current Liabilities | (11) | (19) |
Pension and Other Postretirement Defined Benefit Plans, Total Liabilities | (18) | (29) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | 8 | 9 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 8 | 9 |
Non-U.S. Plans |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 835 | 2,137 |
Defined Benefit Plan, Benefit Obligation, Business Combination | 25 | 0 |
Service Cost | 17 | 48 | 46
Interest Cost | 23 | 54 | 63
Actuarial Loss (Gain) | (4) | (1) |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (30) | (71) |
Impact of curtailments | 1 | 3 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | (6) | 0 |
Spin-Off of Delphi Technologies | 0 | (1,518) |
Exchange rate movements and other | (62) | 183 |
Benefit obligation at end of year | 809 | 835 | 2,137
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair Value of Plan Assets at beginning of year | 377 | 1,212 |
Defined Benefit Plan, Plan Assets, Business Combination | 19 | 0 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | (6) | 75 |
Aptiv contributions | 38 | 67 |
Benefits Paid | 30 | 71 |
Spin-Off of Delphi Technologies | 0 | (997) |
Exchange rate movements and other | (36) | 91 |
Fair Value of Plan Assets at end of year | 362 | 377 | $ 1,212
Defined Benefit Plan, Underfunded Status | (447) | (458) |
Liability, Defined Benefit Plan [Abstract] |  |  |
Assets for Plan Benefits, Defined Benefit Plan | 2 | 4 |
Liability, Defined Benefit Plan, Current | (17) | (31) |
Pension and Other Postretirement Defined Benefit Plans, Non-current Liabilities | (432) | (431) |
Pension and Other Postretirement Defined Benefit Plans, Total Liabilities | (447) | (458) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | 143 | 144 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | 6 | 1 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | $ 149 | $ 145 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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