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ACQUISITIONS - Narrative (Details) € / shares in Units, € in Millions, ¥ in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 20, 2022 USD ($) | Sep. 20, 2022 CNY (¥) | Jul. 29, 2022 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2022 CNY (¥) | Feb. 28, 2022 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2022 CNY (¥) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Sep. 20, 2022 CNY (¥) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 CNY (¥) | Dec. 31, 2021 EUR (€) | Dec. 17, 2021 € / shares | Oct. 25, 2021 USD ($) | Aug. 02, 2021 | Jun. 04, 2021 USD ($) | Jun. 04, 2021 EUR (€) | Dec. 29, 2020 | Sep. 30, 2019 USD ($) | May 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 3,271 |  | $ 3,271 |  |  | $ 3,279 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (gain) loss on equity securities |  |  |  |  |  |  | $ (1) | $ 61 | 27 |  | $ 337 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Romeo Power Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.00% |  |
BorgWarner Romeo Power LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30 |  |  |  |  |  |
BorgWarner Romeo Power LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |
Romeo Power Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method interest (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Unrealized (gain) loss on equity securities |  |  |  |  |  |  |  | $ 61 | $ 39 |  | $ 337 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments fair value |  |  |  |  |  |  |  |  |  |  |  | $ 70 |  |  |  |  |  |  |  |  |  |  |  |  |
BorgWarner Romeo Power LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in joint ventures |  |  |  |  |  | $ 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ownership interest disposal |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of joint venture |  |  |  |  |  | $ 29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination fair value reduced by discount |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BorgWarner Romeo Power LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for investments in equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |
Gain on sale of investments |  |  |  |  |  | $ 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
1.000% Senior Notes due 05/19/31 (€1,000 million par value) | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate |  |  |  |  |  |  | 1.00% |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% |  |  |
Hubei Surpass Sun Electric Charging Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business consideration | $ 60 | ¥ 410 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses | 39 | ¥ 267 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual earn-out payments | $ 21 |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 143 |  |  |  |  |  |  |  |  |  |  |
Retention payment payable period | 2 years |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Rhombus Energy Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  | $ 131 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual earn-out payments |  |  | $ 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 104 |  |  |  | $ 104 |  | $ 104 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other intangible assets, net |  |  | 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rhombus Energy Solutions | Employee Retention Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual earn-out payments |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retention payment payable period |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Santroll Automotive Components |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business consideration |  |  |  | $ 207 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  |  |  |  |  |  | 1,000 | ¥ 157 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual earn-out payments |  |  |  | $ 47 |  |  |  |  |  |  |  |  |  |  |  | ¥ 300 |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 132 |  |  | 127 |  | 127 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other intangible assets, net |  |  |  | 87 |  |  | 87 |  | 87 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments in working capital and debt |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base purchase price |  |  |  | 167 | ¥ 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Earn Out Payment Liability |  |  |  | $ 40 | ¥ 250 |  |  |  | 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration payable |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AKASOL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  | 93.00% |  |  |  |  | 93.00% |  |  | 100.00% | 89.00% | 89.00% |  |  |
Goodwill |  |  |  |  |  |  | 704 |  | 704 |  |  |  |  |  | $ 704 |  |  |  |  |  | $ 707 |  |  |  |
Other intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130 |  |  |  |  |  | 130 |  |  |  |
Amount of settlement paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 788 | € 648 |  |  |
Financial liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77 | € 64 |  |  |
Purchase of additional shares of AKASOL |  |  |  |  |  |  |  |  |  |  |  | $ 33 | € 28 |  |  |  |  |  |  |  |  |  |  |  |
Share price (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 119.16 |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  | $ 58 |  |  | $ 96 |  | € 51 |  |  |  | $ 96 |  |  |  |
Romeo Power Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for investments in equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50
Romeo Power Inc | Romeo Power Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments fair value |  |  |  |  |  |  | $ 31 |  | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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