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Recent Transactions and Events (Details) $ / shares in Units, shares in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 05, 2020 USD ($) | Oct. 01, 2020 USD ($) $ / shares shares | Jan. 02, 2019 USD ($) | Sep. 30, 2019 USD ($) | May 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Oct. 30, 2019
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | $ 308,000,000 | $ 54,000,000 |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  | 29,000,000 | 30,000,000 |
Payments for investments in equity securities |  |  |  |  | $ 50,000,000 |  |  |  |  | 2,000,000 | 52,000,000 |
Asset impairments |  |  |  |  |  | $ 0 |  | $ 0 |  | 26,000,000 | 0 |
Payments for business acquired |  |  |  |  |  |  |  |  |  | 2,000,000 | $ 10,000,000 |
Subsequent Event | Delphi Technologies PLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par or stated value (in per share) | $ / shares |  | $ 0.01 |  |  |  |  |  |  |  |  |  |
DT Notes | Subsequent Event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face value | $ 800,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate (in percent) | 5.00% |  |  |  |  |  |  |  |  |  |  |
Redeemable principal amount | $ 776,000,000 |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount redeemed | 97.00% |  |  |  |  |  |  |  |  |  |  |
Senior notes | $ 24,000,000 |  |  |  |  |  |  |  |  |  |  |
Delphi Technologies PLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  | 100.00% |  |  |  |  |  |  |  |  |  |
Delphi Technologies revised exchange ratio |  | 0.4307 |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  | $ 2,400,000,000 |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable (in shares) | shares |  | 37 |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 900,000,000 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  | 15,000,000 |  |  |  |  |  |  |  |  |  |
Delphi Technologies PLC | Subsequent Event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities assumed |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |
Rinehart Motion Systems LLC and AM Racing LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |
Payments for business acquired |  |  |  |  |  |  | $ 2,000,000 |  | $ 10,000,000 |  |  |
Business combination, contingent consideration, liability |  |  |  |  |  | $ 3,000,000 |  |  |  | $ 3,000,000 |  |
BorgWarner Morse TEC LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage transferred (in percent) |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Romeo Systems, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investee (in percent) |  |  |  |  |  | 20.00% |  |  |  | 20.00% |  |
Asset impairments |  |  |  |  |  |  | 9,000,000 |  |  |  |  |
Fair value of equity investment |  |  |  |  |  |  | $ 41,000,000 |  |  |  |  |
BorgWarner Romeo Power LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investee (in percent) |  |  |  | 60.00% |  |  |  | 60.00% |  |  | 60.00% |
Payments to acquire interest in joint venture |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |

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