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ACQUISITIONS - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 05, 2020 USD ($) | Oct. 01, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 EUR (€) segment | Jun. 30, 2021 USD ($) segment | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 04, 2021 EUR (€) | Jun. 04, 2021 USD ($) | May 19, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 29, 2020 | May 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 3,325 |  |  |  | $ 2,627 |  |
Number of reportable segments | segment |  |  |  |  |  | 4 | 4 |  |  |  |  |  |  |  |
Unrealized loss on equity securities |  |  |  | $ 4 | $ 0 |  | $ 276 | $ 9 |  |  |  |  |  |  |
Equity securities |  |  |  |  |  |  |  |  | 203 |  |  |  | $ 472 |  |
Asset impairments |  |  |  | 0 | 17 |  | 0 | 17 |  |  |  |  |  |  |
BorgWarner Romeo Power LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for investments in equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50
Payments to acquire interest in joint venture |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss on equity securities |  |  |  | $ 4 |  |  | 276 |  |  |  |  |  |  |  |
Equity securities |  |  |  |  |  |  |  |  | $ 156 |  |  |  |  |  |
Asset impairments |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |
Investment in equity securities |  |  |  |  | 41 |  |  | 41 |  |  |  |  |  |  |
Romeo Power Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method interest (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 800 |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |
Debt instrument, face amount | € |  |  |  |  |  | € 1,000,000,000 |  |  |  |  |  | € 1,000,000,000.0 |  |  |
Senior Notes | DT Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable principal amount | $ 776 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount redeemed | 97.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
BorgWarner Romeo Power LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent (in percent) |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  | 14.00% |
AKASOL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  | 93.00% |  |  | 93.00% | 89.00% | 89.00% |  |  |  |
Amount of settlement paid |  |  |  |  |  |  |  |  |  | € 648,000,000 | $ 788 |  |  |  |
Purchase of additional shares of AKASOL |  |  |  |  |  | € 28,000,000 | $ 33 |  |  |  |  |  |  |  |
Financial liabilities assumed |  |  |  |  |  |  |  |  |  | € 64,000,000 | 77 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 707 |  |  |  |
Delphi Technologies PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 710 |  |  |  |  |  |  | $ 733 |  |  |  |  |  |
Estimated Fair Value |  | $ 650 |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed exchange ratio |  | 0.4307 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollar per share) | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  | $ 2,391 |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | $ 2,054 |  |  | $ 5,278 |  |  |  |  |  |  |
Delphi Technologies PLC | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities assumed |  | 800 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes | $ 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technology | AKASOL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Fair Value |  |  |  |  |  |  |  |  | $ 130 |  |  |  |  |  |
Developed technology | Delphi Technologies PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Fair Value |  | $ 270 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Life |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Life |  |  |  |  |  | 7 years | 7 years |  |  |  |  |  |  |  |
Customer relationships | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Life |  |  |  |  |  | 15 years | 15 years |  |  |  |  |  |  |  |
Customer relationships | Delphi Technologies PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Fair Value |  | $ 380 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Life |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |

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