RETIREMENT BENEFITS - Fair Value Disclosure (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 9,849	$ 10,441
U.S. | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	7,299	7,869
U.S. | Level 1
Defined Benefit Plan Disclosure
Total net assets	1,200	1,557
U.S. | Level 2
Defined Benefit Plan Disclosure
Total net assets	6,095	6,307
U.S. | Level 3
Defined Benefit Plan Disclosure
Total net assets	4	5	$ 7
U.S. | Total investments at fair value | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	6,863	7,381
U.S. | Total investments at fair value | Level 1
Defined Benefit Plan Disclosure
Total net assets	1,164	1,549
U.S. | Total investments at fair value | Level 2
Defined Benefit Plan Disclosure
Total net assets	5,695	5,827
U.S. | Total investments at fair value | Level 3
Defined Benefit Plan Disclosure
Total net assets	4	5
U.S. | U.S. equities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	315	262
U.S. | U.S. equities | Level 1
Defined Benefit Plan Disclosure
Total net assets	315	262
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	269	315
U.S. | Non-U.S. equities | Level 1
Defined Benefit Plan Disclosure
Total net assets	269	315
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	188	244
U.S. | Mutual funds and other registered investment companies | Level 1
Defined Benefit Plan Disclosure
Total net assets	188	244
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	515	622
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	515	622
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	5,535	5,731
U.S. | Debt securities | Level 1
Defined Benefit Plan Disclosure
Total net assets	390	690
U.S. | Debt securities | Level 2
Defined Benefit Plan Disclosure
Total net assets	5,145	5,041
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	36	202
U.S. | Derivatives | Level 1
Defined Benefit Plan Disclosure
Total net assets	1	38
U.S. | Derivatives | Level 2
Defined Benefit Plan Disclosure
Total net assets	35	164
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	2	2
U.S. | Other investments | Level 1
Defined Benefit Plan Disclosure
Total net assets	1	0
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	2	4
U.S. | Cash and short-term investments | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	485	662
U.S. | Cash and short-term investments | Level 1
Defined Benefit Plan Disclosure
Total net assets	46	11
U.S. | Cash and short-term investments | Level 2
Defined Benefit Plan Disclosure
Total net assets	439	651
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	(49)	(174)
U.S. | Other investment liabilities | Level 1
Defined Benefit Plan Disclosure
Total net assets	(10)	(3)
U.S. | Other investment liabilities | Level 2
Defined Benefit Plan Disclosure
Total net assets	(39)	(171)
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	18
U.S. | Other investment liabilities redeemed at NAV | Net Asset Value
Defined Benefit Plan Disclosure
Total net assets		(127)
U.S. | Securities | Net Asset Value
Defined Benefit Plan Disclosure
Total net assets	2,532	2,699
Non-U.S.
Defined Benefit Plan Disclosure
Total net assets	7,013	7,396
Non-U.S. | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	6,996	7,380
Non-U.S. | Level 1
Defined Benefit Plan Disclosure
Total net assets	5,887	6,276
Non-U.S. | Level 2
Defined Benefit Plan Disclosure
Total net assets	869	869
Non-U.S. | Level 3
Defined Benefit Plan Disclosure
Total net assets	240	235	262
Non-U.S. | Total investments at fair value | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	8,561	8,891
Non-U.S. | Total investments at fair value | Level 1
Defined Benefit Plan Disclosure
Total net assets	5,774	6,193
Non-U.S. | Total investments at fair value | Level 2
Defined Benefit Plan Disclosure
Total net assets	2,547	2,463
Non-U.S. | Total investments at fair value | Level 3
Defined Benefit Plan Disclosure
Total net assets	240	235
Non-U.S. | U.S. equities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	46	133
Non-U.S. | U.S. equities | Level 1
Defined Benefit Plan Disclosure
Total net assets	46	133
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	435	722
Non-U.S. | Non-U.S. equities | Level 1
Defined Benefit Plan Disclosure
Total net assets	435	722
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	3,308	3,016
Non-U.S. | Mutual funds and other registered investment companies | Level 1
Defined Benefit Plan Disclosure
Total net assets	2,990	2,706
Non-U.S. | Mutual funds and other registered investment companies | Level 2
Defined Benefit Plan Disclosure
Total net assets	318	310
Non-U.S. | Mutual funds and other registered investment companies | Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. | Commingled funds | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets		12
Non-U.S. | Commingled funds | Level 1
Defined Benefit Plan Disclosure
Total net assets		12
Non-U.S. | Commingled funds | Level 2
Defined Benefit Plan Disclosure
Total net assets		0
Non-U.S. | Commingled funds | Level 3
Defined Benefit Plan Disclosure
Total net assets		0
Non-U.S. | Debt securities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	3,324	3,636
Non-U.S. | Debt securities | Level 1
Defined Benefit Plan Disclosure
Total net assets	2,303	2,620
Non-U.S. | Debt securities | Level 2
Defined Benefit Plan Disclosure
Total net assets	1,021	1,016
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	1,208	1,137
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	1,208	1,137
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	236	231
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	236	231	258
Non-U.S. | Cash and short-term investments | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	113	83
Non-U.S. | Cash and short-term investments | Level 1
Defined Benefit Plan Disclosure
Total net assets	113	83
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	(1,678)	(1,594)
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	(1,678)	(1,594)
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	17	16
Pension Plans | U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 9,647	$ 10,210	10,145
Allocable interest (as a percent)	98.00%	98.00%
Pension Plans | Non-U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 6,258	$ 6,426	6,086
Postretirement Benefit Plans | U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 202	$ 231	253
Allocable interest (as a percent)	2.00%	2.00%
Postretirement Benefit Plans | Non-U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 755	$ 970	$ 855