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ACQUISITIONS - Narrative (Details) € / shares in Units, € in Millions, ¥ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2022 USD ($) | Feb. 28, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2022 CNY (¥) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | 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 |  |  | $ 3,284 |  |  |  | $ 3,284 |  | $ 3,279 |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  | $ 11 |  |  | $ (4) | (28) | $ (276) |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.00% |  |
Romeo Power Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method interest (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Unrealized gain (loss) on investments |  |  |  |  |  | $ (4) | $ (39) | $ (276) |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 1.000% Senior Notes due 05/19/31 (€1,000 million par value) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate |  |  | 1.00% |  |  |  | 1.00% |  |  |  |  |  |  |  |  | 1.00% | 1.00% |  |  |
Santoll Automotive Components |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  | 100.00% |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Business consideration |  |  |  | $ 212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base purchase price |  |  |  | 172 | ¥ 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn out payment liability |  |  |  | 40 | ¥ 250 |  | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  |  |  |  | 157 |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration payable |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out payments |  |  |  | 47 |  |  |  |  |  |  | ¥ 300 |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 132 | 132 |  |  | 132 |  |  |  |  |  |  |  |  |  |  |  |  |
Other intangible assets, net |  |  |  | $ 87 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 707 |  |  |  |
Other intangible assets, net |  |  | 130 |  |  |  | 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 |  |  | 96 |  |  |  | 96 |  | $ 58 |  |  | € 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 |  |  |  |  |  |  |  |  |  |  |  |  |
Rhombus Energy Solutions | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses | $ 130 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration payable in next three years | $ 55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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