ACQUISITIONS AND DISPOSITIONS (Details) ¥ in Millions, SFr in Millions, $ in Millions					3 Months Ended						6 Months Ended		12 Months Ended
	Mar. 01, 2023 USD ($)	Mar. 01, 2023 CNY (¥)	Dec. 01, 2022 USD ($)	Dec. 01, 2022 CHF (SFr)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)	Jun. 30, 2025 CHF (SFr)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 CNY (¥)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CNY (¥)	Jun. 30, 2025 CNY (¥)	Jun. 30, 2025 CHF (SFr)	Dec. 31, 2024 CNY (¥)	Mar. 01, 2023 CNY (¥)	Dec. 01, 2022 CHF (SFr)
Business Combination [Line Items]
Asset impairment and lease modifications					$ 4					$ 0	$ 23	$ 0
Costs to exit charging business					6					0	32	0
Impairment charges					3					$ 0	42	$ 0
Impairment											(13)
Held-for-sale | SSE Business
Business Combination [Line Items]
Proceeds from Business					7
Asset impairment and lease modifications					3						22
Battery & Charging Systems
Business Combination [Line Items]
Asset impairment and lease modifications					4						23
Write-off inventory											9
Impairment of intangible assets											39
Impairment charges											22
Impairment											(13)
Fixed asset					4						4
Hubei Surpass Sun Electric Charging Business
Business Combination [Line Items]
Business acquisition, percentage of voting interests acquired	100.00%																			100.00%
Business consideration	$ 42	¥ 288
Base purchase price	39	¥ 268
Payments to acquire businesses													$ 4	¥ 25	$ 31	¥ 217
Post-closing adjustments through reduction of payment								$ 1	¥ 6
Contractual earn-out payments	$ 15																			¥ 103
Remaining consideration paid					2	¥ 10							1	¥ 10
Hubei Surpass Sun Electric Charging Business | Other current liabilities
Business Combination [Line Items]
Consideration payable in next two years					3						3		$ 3				¥ 20		¥ 20
Drivetek AG
Business Combination [Line Items]
Business acquisition, percentage of voting interests acquired			100.00%																		100.00%
Business consideration			$ 39	SFr 37
Base purchase price			29	27
Payments to acquire businesses			29	SFr 27
Contractual earn-out payments			$ 10																		SFr 10
Remaining consideration paid					2		SFr 2
Retention payment payable period			3 years																		3 years
Other non-current liability					$ 3						$ 3							SFr 2