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Summary of Significant Accounting Policies Accounting Policies (Details) | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) Segment $ / shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2019 USD ($)
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Accounts receivable - net |  |  | $ 5,770,000,000 | $ 5,622,000,000 |  |  |
Inventories |  |  | 1,814,000,000 | 1,819,000,000 |  |  |
Assets held for sale |  |  | 98,000,000 | 3,015,000,000 |  |  |
Other current assets |  |  | $ 1,906,000,000 | 1,182,000,000 |  |  |
Cash in escrow related to Adient debt |  |  |  |  |  | $ 2,000,000,000.0 |
Deferred tax asset from stock options exercised and restricted stock vestings |  | $ 179,000,000 |  |  |  |  |
Number of Countries in which Entity Operates |  |  | 150 |  |  |  |
Maturity period to be considered cash equivalents |  |  | 3 months |  |  |  |
Document Period End Date |  |  | Sep. 30, 2019 |  |  |  |
Restricted Cash and Cash Equivalents |  |  | $ 16,000,000 | 15,000,000 |  |  |
Restricted Cash and Investments, Current |  |  |  | 6,000,000 |  |  |
Restricted Cash and Cash Equivalents, Noncurrent |  |  |  | 9,000,000 |  |  |
Liability for Asbestos and Environmental Claims, Gross |  |  | $ 507,000,000 | 550,000,000 |  |  |
Pooled subscriber assets and related deferred revenue, useful life |  |  | 12 years |  |  |  |
Non-pooled subscriber assets and related deferred revenue, useful life |  |  | 15 years |  |  |  |
Standard chargeback period from dealer for monitoring service cancellations |  |  | 6 months |  |  |  |
Non-standard chargeback period from dealer for monitoring service cancellations |  |  | 12 months |  |  |  |
Research and Development Expense |  |  | $ 319,000,000 | 310,000,000 | $ 307,000,000 |  |
Foreign currency transaction gains (losses) |  |  | $ (10,000,000) | $ 1,000,000 | 60,000,000 |  |
Number of reportable segments | Segment |  |  | 4 |  |  |  |
Proceeds from Issuance of Unsecured Debt |  |  |  |  |  | $ 2,000,000,000.0 |
Ordinary shares, par value | $ / shares |  |  | $ 0.01 | $ 0.01 |  |  |
Net sales |  |  | $ 23,968,000,000 | $ 23,400,000,000 | 22,835,000,000 |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  | 1,056,000,000 | 1,546,000,000 | 1,151,000,000 |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  | 4,598,000,000 | 1,034,000,000 | 990,000,000 |  |
Property, plant and equipment - net |  |  | 3,348,000,000 | 3,300,000,000 | $ 3,341,000,000 |  |
Other noncurrent assets |  |  | 1,823,000,000 | 3,070,000,000 |  |  |
Deferred revenue |  |  | 1,407,000,000 | 1,326,000,000 |  |  |
Disposal Group, Including Discontinued Operation, Liabilities |  |  | 44,000,000 | 1,791,000,000 |  |  |
Retained earnings |  |  | $ 4,827,000,000 | $ 6,604,000,000 |  |  |
Minimum |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Estimated useful life of dealer intangible assets |  |  | 12 years |  |  |  |
Maximum |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Estimated useful life of dealer intangible assets |  |  | 15 years |  |  |  |
Building And Improvements | Minimum |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |  |
Building And Improvements | Maximum |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 40 years |  |  |  |
Machinery and Equipment | Minimum |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |  |
Machinery and Equipment | Maximum |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 15 years |  |  |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  | $ (546,000,000) |  |  |  |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  | 0 |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  | (45,000,000) |  |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  | 0.03 |  |  |  |
Retained Earnings | Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  | (546,000,000) |  |  |  |
Retained Earnings | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ 8,000,000 |  | 8,000,000 |  |  |  |
Retained Earnings | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  | (45,000,000) |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Accounts receivable - net |  |  | (32,000,000) |  |  |  |
Inventories |  |  | (14,000,000) |  |  |  |
Other current assets |  |  | (25,000,000) |  |  |  |
Property, plant and equipment - net |  |  | 40,000,000 |  |  |  |
Other noncurrent assets |  |  | 29,000,000 |  |  |  |
Deferred revenue |  |  | 9,000,000 |  |  |  |
Retained earnings |  |  | (11,000,000) |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Net sales |  |  | 3,000,000 |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest |  |  | 1,000,000 |  |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Accounts receivable - net |  |  | 5,802,000,000 |  |  |  |
Inventories |  |  | 1,828,000,000 |  |  |  |
Other current assets |  |  | 1,931,000,000 |  |  |  |
Property, plant and equipment - net |  |  | 3,308,000,000 |  |  |  |
Other noncurrent assets |  |  | 1,794,000,000 |  |  |  |
Deferred revenue |  |  | 1,398,000,000 |  |  |  |
Retained earnings |  |  | 4,838,000,000 |  |  |  |
Power Solutions | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Revenue |  |  | 667,000,000 |  |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  | $ 26,000,000 |  |  |  |
Power Solutions |  |  |  |  |  |  |
Financial Statement Details [Line Items] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  | $ 13,200,000,000
Disposal Group, Discontinued Operations, Consideration, net |  |  |  |  |  |  | $ 11,600,000,000

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