CONTRACT AND OTHER DEFERRED ASSETS & CONTRACT LIABILITIES AND DEFERRED INCOME - Schedule of Contract Assets (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	$ 9,320	$ 9,294
Non-current contract and other deferred assets	471	378
Total contract and other deferred assets	9,791	9,672
Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	5,332	5,417
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	3,988	3,877
Power
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	6,983	6,938
Non-current contract and other deferred assets	463	368
Total contract and other deferred assets	7,445	7,305
Power \| Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	5,332	5,417
Power \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	1,650	1,521
Electrification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	1,711	1,368
Non-current contract and other deferred assets	8	9
Total contract and other deferred assets	1,719	1,376
Electrification \| Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	0	0
Electrification \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	1,711	1,368
Wind
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	627	988
Non-current contract and other deferred assets	0	1
Total contract and other deferred assets	627	990
Wind \| Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	0	0
Wind \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current contract assets	$ 627	$ 988