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Investments in Affiliates Narrative (Details) $ / shares in Units, € in Millions, ¥ in Millions, $ in Millions						3 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 16, 2025 EUR (€)	Jun. 01, 2025 USD ($)	May 30, 2025 USD ($)	Sep. 23, 2024 USD ($)	Sep. 23, 2024 CNY (¥)	Jun. 30, 2026 USD ($) $ / shares Rate	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) Rate	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) $ / shares	Mar. 31, 2026	Oct. 20, 2025 USD ($)	May 16, 2024
Schedule of Equity Method Investments [Line Items]
Equity Method Investments						$ 1,255		$ 1,255			$ 1,288
Net gain on equity method transactions		$ 13				3	$ 46	3	$ 46		$ 33
Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee, Per Diluted Share \| $ / shares											$ 0.15
Proceeds from the sale of equity method investment								0	$ 164
Available-for-sale debt securities						$ 60		$ 60			$ 58		$ 149
Various Equity Method Investments \| Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage \| Rate						13.00%		13.00%
Various Equity Method Investments \| Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage \| Rate						50.00%		50.00%
TTTech Auto AG
Schedule of Equity Method Investments [Line Items]
Disposal, Percentage	100.00%
Motional AD LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage			13.00%											15.00%
Equity Method Investments						$ 222		$ 222			246
Capital Committed by Hyundai to Fund Motional			$ 440
Motional AD LLC \| Series B Preferred Stock
Schedule of Equity Method Investments [Line Items]
Equity Method Investments						$ 899		$ 899			899
StradVision, Inc.
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage						36.00%		36.00%				41.00%
Equity Method Investments						$ 134		$ 134			143
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity						131		131			$ 137
Payments to Acquire Debt Securities, Available-for-Sale								$ 108		$ 40
Equity Method Investment, Realized Gain (Loss) on Disposal						$ 3
Equity Method Investment, Realized Gain (Loss) on Disposal, Per Diluted Share \| $ / shares						$ 0.01
United States of America, Dollars \| TTTech Auto AG
Schedule of Equity Method Investments [Line Items]
Proceeds from the sale of equity method investment \| €	€ 164
United States of America, Dollars \| Maxieye
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Debt Securities, Available-for-Sale				$ 57
Chinese Yuan Renminbi \| Maxieye
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Debt Securities, Available-for-Sale \| ¥					¥ 399