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Other Expense, Net - Summary Of Net Losses Or Gains On Investments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Gain (Loss) on Securities [Line Items] |  |  |
Non-cash impairment charges | [1] | $ 90 | $ 0
Other expense, net |  | 201 | 221
Tax effect |  | (28) | (53)
Net loss attributable to Magna |  | 173 | 168
Public Company Warrants [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Unrealized gain on investment revaluation |  | 110 | 173
Public and Private Equity Investments [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Unrealized gain on investment revaluation |  | 1 | 49
Public Equity Investments [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Unrealized gain on investment revaluation |  | $ 0 | $ (1)
[1] | The non-cash impairment charges relate to impairments of private equity investments and related long-term receivables within Other assets.

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