RETIREMENT BENEFITS - Fair Value Disclosure (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 9,941	$ 9,849
U.S. \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	7,273	7,299
U.S. \| Level 1
Defined Benefit Plan Disclosure
Total net assets	1,192	1,200
U.S. \| Level 2
Defined Benefit Plan Disclosure
Total net assets	6,077	6,095
U.S. \| Level 3
Defined Benefit Plan Disclosure
Total net assets	4	4	$ 5
U.S. \| Total investments at fair value \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	6,850	6,863
U.S. \| Total investments at fair value \| Level 1
Defined Benefit Plan Disclosure
Total net assets	1,164	1,164
U.S. \| Total investments at fair value \| Level 2
Defined Benefit Plan Disclosure
Total net assets	5,682	5,695
U.S. \| Total investments at fair value \| Level 3
Defined Benefit Plan Disclosure
Total net assets	4	4
U.S. \| U.S. equities \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	349	315
U.S. \| U.S. equities \| Level 1
Defined Benefit Plan Disclosure
Total net assets	349	315
U.S. \| U.S. equities \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| U.S. equities \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Non-U.S. equities \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	296	269
U.S. \| Non-U.S. equities \| Level 1
Defined Benefit Plan Disclosure
Total net assets	296	269
U.S. \| Non-U.S. equities \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Non-U.S. equities \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Mutual funds and other registered investment companies \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	193	188
U.S. \| Mutual funds and other registered investment companies \| Level 1
Defined Benefit Plan Disclosure
Total net assets	193	188
U.S. \| Mutual funds and other registered investment companies \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Mutual funds and other registered investment companies \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Commingled funds \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	534	515
U.S. \| Commingled funds \| Level 1
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Commingled funds \| Level 2
Defined Benefit Plan Disclosure
Total net assets	534	515
U.S. \| Commingled funds \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Debt securities \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	5,430	5,535
U.S. \| Debt securities \| Level 1
Defined Benefit Plan Disclosure
Total net assets	323	390
U.S. \| Debt securities \| Level 2
Defined Benefit Plan Disclosure
Total net assets	5,107	5,145
U.S. \| Debt securities \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Annuity contracts \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	3	3
U.S. \| Annuity contracts \| Level 1
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Annuity contracts \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Annuity contracts \| Level 3
Defined Benefit Plan Disclosure
Total net assets	3	3	3
U.S. \| Derivatives \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	44	36
U.S. \| Derivatives \| Level 1
Defined Benefit Plan Disclosure
Total net assets	3	1
U.S. \| Derivatives \| Level 2
Defined Benefit Plan Disclosure
Total net assets	41	35
U.S. \| Derivatives \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Other investments \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	1	2
U.S. \| Other investments \| Level 1
Defined Benefit Plan Disclosure
Total net assets	0	1
U.S. \| Other investments \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Other investments \| Level 3
Defined Benefit Plan Disclosure
Total net assets	1	1	2
U.S. \| Cash and short-term investments \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	464	485
U.S. \| Cash and short-term investments \| Level 1
Defined Benefit Plan Disclosure
Total net assets	32	46
U.S. \| Cash and short-term investments \| Level 2
Defined Benefit Plan Disclosure
Total net assets	432	439
U.S. \| Cash and short-term investments \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Other investment liabilities \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	(41)	(49)
U.S. \| Other investment liabilities \| Level 1
Defined Benefit Plan Disclosure
Total net assets	(4)	(10)
U.S. \| Other investment liabilities \| Level 2
Defined Benefit Plan Disclosure
Total net assets	(37)	(39)
U.S. \| Other investment liabilities \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. \| Other investment receivables redeemed at NAV \| Net Asset Value
Defined Benefit Plan Disclosure
Total net assets	43
U.S. \| Other investment receivables redeemed at NAV \| Net Asset Value
Defined Benefit Plan Disclosure
Total net assets		18
U.S. \| Securities \| Net Asset Value
Defined Benefit Plan Disclosure
Total net assets	2,625	2,532
Non-U.S.
Defined Benefit Plan Disclosure
Total net assets	8,382	7,013
Non-U.S. \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	8,353	6,996
Non-U.S. \| Level 1
Defined Benefit Plan Disclosure
Total net assets	6,950	5,887
Non-U.S. \| Level 2
Defined Benefit Plan Disclosure
Total net assets	1,021	869
Non-U.S. \| Level 3
Defined Benefit Plan Disclosure
Total net assets	382	240	235
Non-U.S. \| Total investments at fair value \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	8,746	8,561
Non-U.S. \| Total investments at fair value \| Level 1
Defined Benefit Plan Disclosure
Total net assets	6,854	5,774
Non-U.S. \| Total investments at fair value \| Level 2
Defined Benefit Plan Disclosure
Total net assets	1,510	2,547
Non-U.S. \| Total investments at fair value \| Level 3
Defined Benefit Plan Disclosure
Total net assets	382	240
Non-U.S. \| U.S. equities \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	13	46
Non-U.S. \| U.S. equities \| Level 1
Defined Benefit Plan Disclosure
Total net assets	13	46
Non-U.S. \| U.S. equities \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| U.S. equities \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Non-U.S. equities \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	276	435
Non-U.S. \| Non-U.S. equities \| Level 1
Defined Benefit Plan Disclosure
Total net assets	276	435
Non-U.S. \| Non-U.S. equities \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Non-U.S. equities \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Mutual funds and other registered investment companies \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	4,590	3,308
Non-U.S. \| Mutual funds and other registered investment companies \| Level 1
Defined Benefit Plan Disclosure
Total net assets	4,202	2,990
Non-U.S. \| Mutual funds and other registered investment companies \| Level 2
Defined Benefit Plan Disclosure
Total net assets	388	318
Non-U.S. \| Mutual funds and other registered investment companies \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Debt securities \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	3,296	3,324
Non-U.S. \| Debt securities \| Level 1
Defined Benefit Plan Disclosure
Total net assets	2,363	2,303
Non-U.S. \| Debt securities \| Level 2
Defined Benefit Plan Disclosure
Total net assets	933	1,021
Non-U.S. \| Debt securities \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Real assets(1) \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	2	2
Non-U.S. \| Real assets(1) \| Level 1
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Real assets(1) \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Real assets(1) \| Level 3
Defined Benefit Plan Disclosure
Total net assets	2	2	2
Non-U.S. \| Annuity contracts \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	2	2
Non-U.S. \| Annuity contracts \| Level 1
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Annuity contracts \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Annuity contracts \| Level 3
Defined Benefit Plan Disclosure
Total net assets	2	2	2
Non-U.S. \| Derivatives \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	189	1,208
Non-U.S. \| Derivatives \| Level 1
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Derivatives \| Level 2
Defined Benefit Plan Disclosure
Total net assets	189	1,208
Non-U.S. \| Derivatives \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Other investments \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	378	236
Non-U.S. \| Other investments \| Level 1
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Other investments \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Other investments \| Level 3
Defined Benefit Plan Disclosure
Total net assets	378	236	231
Non-U.S. \| Cash and short-term investments \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	96	113
Non-U.S. \| Cash and short-term investments \| Level 1
Defined Benefit Plan Disclosure
Total net assets	96	113
Non-U.S. \| Cash and short-term investments \| Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Cash and short-term investments \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Other investment liabilities \| Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	(489)	(1,678)
Non-U.S. \| Other investment liabilities \| Level 1
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Other investment liabilities \| Level 2
Defined Benefit Plan Disclosure
Total net assets	(489)	(1,678)
Non-U.S. \| Other investment liabilities \| Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. \| Securities \| Net Asset Value
Defined Benefit Plan Disclosure
Total net assets	29	17
Pension Plans \| U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 9,755	$ 9,647	10,210
Allocable interest (as a percent)	99.00%	98.00%
Pension Plans \| Non-U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 7,226	$ 6,258	6,426
Postretirement Benefit Plans \| U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 186	$ 202	231
Allocable interest (as a percent)	1.00%	2.00%
Postretirement Benefit Plans \| Non-U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 1,156	$ 755	$ 970