Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	$ 0	$ 0	$ 8
Components of net periodic benefit cost other than service cost	21	20	27
Investment Income, Dividend	6	9	9
Research and Development expense	1,030	1,024	1,165
Allowance for Doubtful Accounts Receivable	37	40
Accounts Receivable, Credit Loss Expense (Reversal)	22	39	9
Reimbursable engineering costs	286	355
Property Plant & Equipment, net	3,294	3,301
Foreign Currency Transaction Gain (Loss), Net of Tax	0	(20)	$ (3)
Asset Retirement Obligation	1	1
Unamortized Revolving Credit Facility debt issuance costs	11	11
Operating lease right-of-use asset (Note 25)	383	380
Operating lease liabilities (Note 25)	92	100
Long-term operating lease liabilities (Note 25)	304	300
Equity investments (Note 5)	30	113
Equity Securities, FV-NI, Current	66	0
GM
Significant Accounting Policies [Line Items]
Accounts and Other Receivables	208	200
VW
Significant Accounting Policies [Line Items]
Accounts and Other Receivables	163	216
Stellantis
Significant Accounting Policies [Line Items]
Accounts and Other Receivables	$ 317	$ 352
Customer Concentration Risk \| Total Net Sales \| GM & VW
Significant Accounting Policies [Line Items]
Percentage of Total Net Sales	28.00%	31.00%	31.00%
Customer Concentration Risk \| Total Net Sales \| GM
Significant Accounting Policies [Line Items]
Percentage of Total Net Sales	8.00%	9.00%	9.00%
Customer Concentration Risk \| Total Net Sales \| VW
Significant Accounting Policies [Line Items]
Percentage of Total Net Sales	9.00%	10.00%	9.00%
Customer Concentration Risk \| Total Net Sales \| Stellantis
Significant Accounting Policies [Line Items]
Percentage of Total Net Sales	11.00%	12.00%	13.00%
Special Tools
Significant Accounting Policies [Line Items]
Property Plant & Equipment, net	$ 405	$ 447
Aptiv-Owned Special Tools
Significant Accounting Policies [Line Items]
Property Plant & Equipment, net	303	323
Customer-Owned Special Tools
Significant Accounting Policies [Line Items]
Property Plant & Equipment, net	102	124
Other Long-Term Assets
Significant Accounting Policies [Line Items]
Equity investments (Note 5)	30	113
Equity Securities, FV-NI, Current	$ 66	$ 0

Components of net periodic pension benefit cost other than service cost.

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The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses). Post tax.

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Significant Accounting Policies [Line Items]

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Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Amount of dividend income on nonoperating securities.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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