SEGMENT INFORMATION - Assets By Segment (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Segment Reporting [Line Items]
Total assets	$ 86,220		$ 86,220		$ 63,016
Property, plant, and equipment additions	640	$ 243	2,352	$ 595
Depreciation and amortization	439	213	1,199	623
Operating segments \| Power
Segment Reporting [Line Items]
Total assets	28,936		28,936		26,847
Property, plant, and equipment additions	324	107	681	260
Depreciation and amortization	123	116	359	347
Operating segments \| Electrification
Segment Reporting [Line Items]
Total assets	21,664		21,664		9,017
Property, plant, and equipment additions	192	41	1,334	110
Depreciation and amortization	228	25	608	68
Operating segments \| Electrification \| Prolec GE
Segment Reporting [Line Items]
Property, plant, and equipment additions			949
Operating segments \| Wind
Segment Reporting [Line Items]
Total assets	12,331		12,331		11,444
Property, plant, and equipment additions	81	61	233	157
Depreciation and amortization	73	56	187	161
Other
Segment Reporting [Line Items]
Total assets	23,288		23,288		$ 15,709
Property, plant, and equipment additions	42	33	106	68
Depreciation and amortization	$ 15	$ 16	$ 45	$ 47