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ACQUISITIONS - Narrative (Details) € / shares in Units, € in Millions, ¥ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2022 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2022 CNY (¥) | Mar. 31, 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn out payments, current |  | $ 16 |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Earn out payments, noncurrent |  | 24 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 3,388 |  |  | 3,279 |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  | (39) |  | $ (272) |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | 60 |  |  | 130 |  |  |  |  |  |  |  |  |  |  |
BorgWarner Romeo Power LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure |  |  |  |  |  |  |  |  |  | $ 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 |  | (39) |  | $ (272) |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI |  |  |  |  | $ 70 |  |  |  |  |  |  |  |  |  |  |
BorgWarner Romeo Power LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ownership interest disposal | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of joint venture | $ 29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination fair value reduced by discount | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure | $ 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  | 157 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration payable |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out payments |  | 47 |  |  |  |  | ¥ 300 |  |  |  |  |  |  |  |  |
Goodwill |  | 132 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other intangible assets, net |  | 87 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Santoll Automotive Components | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn out payments, current |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Santoll Automotive Components | Other Noncurrent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn out payments, noncurrent |  | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |
AKASOL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  | 93.00% |  |  | 93.00% |  |  | 100.00% | 89.00% | 89.00% |  |  |
Goodwill |  | 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 |  | 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities, FV-NI |  | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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