RETIREMENT BENEFITS - Fair Value Disclosure (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 10,398	$ 13,296
U.S. | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	7,797	10,374
U.S. | Level 1
Defined Benefit Plan Disclosure
Total net assets	1,782	2,805
U.S. | Level 2
Defined Benefit Plan Disclosure
Total net assets	6,008	7,540
U.S. | Level 3
Defined Benefit Plan Disclosure
Total net assets	7	29	$ 58
U.S. | Total investments | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	7,250	9,746
U.S. | Total investments | Level 1
Defined Benefit Plan Disclosure
Total net assets	1,753	2,787
U.S. | Total investments | Level 2
Defined Benefit Plan Disclosure
Total net assets	5,490	6,930
U.S. | Total investments | Level 3
Defined Benefit Plan Disclosure
Total net assets	7	29
U.S. | U.S. equities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	233	358
U.S. | U.S. equities | Level 1
Defined Benefit Plan Disclosure
Total net assets	233	358
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	346	460
U.S. | Non-U.S. equities | Level 1
Defined Benefit Plan Disclosure
Total net assets	346	460
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	243	297
U.S. | Mutual funds and other registered investment companies | Level 1
Defined Benefit Plan Disclosure
Total net assets	243	297
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	818	1,143
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	818	1,143
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	5,567	7,427
U.S. | Debt securities | Level 1
Defined Benefit Plan Disclosure
Total net assets	929	1,657
U.S. | Debt securities | Level 2
Defined Benefit Plan Disclosure
Total net assets	4,638	5,770
U.S. | Debt securities | Level 3
Defined Benefit Plan Disclosure
Total net assets		0
U.S. | Annuity contracts | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	3	4
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	4	1
U.S. | Derivatives | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	36	19
U.S. | Derivatives | Level 1
Defined Benefit Plan Disclosure
Total net assets	2	2
U.S. | Derivatives | Level 2
Defined Benefit Plan Disclosure
Total net assets	34	17
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	4	38
U.S. | Other investments | Level 1
Defined Benefit Plan Disclosure
Total net assets	0	13
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	4	25	57
U.S. | Cash and short-term investments | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	602	652
U.S. | Cash and short-term investments | Level 1
Defined Benefit Plan Disclosure
Total net assets	39	25
U.S. | Cash and short-term investments | Level 2
Defined Benefit Plan Disclosure
Total net assets	563	627
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	(55)	(24)
U.S. | Other investment liabilities | Level 1
Defined Benefit Plan Disclosure
Total net assets	(10)	(7)
U.S. | Other investment liabilities | Level 2
Defined Benefit Plan Disclosure
Total net assets	(45)	(17)
U.S. | Other investment liabilities | Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
U.S. | Other investment liabilities redeemed at NAV | Net Asset Value
Defined Benefit Plan Disclosure
Total net assets	21
U.S. | Other investment receivables redeemed at NAV | Net Asset Value
Defined Benefit Plan Disclosure
Total net assets		(29)
U.S. | Securities | Net Asset Value
Defined Benefit Plan Disclosure
Total net assets	2,580	2,951
Non-U.S.
Defined Benefit Plan Disclosure
Total net assets	6,941	8,657
Non-U.S. | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	6,925	8,638
Non-U.S. | Level 1
Defined Benefit Plan Disclosure
Total net assets	6,296	8,129
Non-U.S. | Level 2
Defined Benefit Plan Disclosure
Total net assets	367	187
Non-U.S. | Level 3
Defined Benefit Plan Disclosure
Total net assets	262	322	319
Non-U.S. | Total investments | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	9,286	10,094
Non-U.S. | Total investments | Level 1
Defined Benefit Plan Disclosure
Total net assets	6,227	8,012
Non-U.S. | Total investments | Level 2
Defined Benefit Plan Disclosure
Total net assets	2,797	1,760
Non-U.S. | Total investments | Level 3
Defined Benefit Plan Disclosure
Total net assets	262	322
Non-U.S. | U.S. equities | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	131	146
Non-U.S. | U.S. equities | Level 1
Defined Benefit Plan Disclosure
Total net assets	121	127
Non-U.S. | U.S. equities | Level 2
Defined Benefit Plan Disclosure
Total net assets	10	19
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	737	805
Non-U.S. | Non-U.S. equities | Level 1
Defined Benefit Plan Disclosure
Total net assets	718	713
Non-U.S. | Non-U.S. equities | Level 2
Defined Benefit Plan Disclosure
Total net assets	19	92
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	2,712	2,954
Non-U.S. | Mutual funds and other registered investment companies | Level 1
Defined Benefit Plan Disclosure
Total net assets	2,416	2,888
Non-U.S. | Mutual funds and other registered investment companies | Level 2
Defined Benefit Plan Disclosure
Total net assets	296	66
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	13	21
Non-U.S. | Commingled funds | Level 1
Defined Benefit Plan Disclosure
Total net assets	13	21
Non-U.S. | Commingled funds | Level 2
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. | Commingled funds | 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	3,939	5,604
Non-U.S. | Debt securities | Level 1
Defined Benefit Plan Disclosure
Total net assets	2,959	4,263
Non-U.S. | Debt securities | Level 2
Defined Benefit Plan Disclosure
Total net assets	980	1,341
Non-U.S. | Debt securities | Level 3
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. | Real estate | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	4	5
Non-U.S. | Real estate | Level 1
Defined Benefit Plan Disclosure
Total net assets	0	0
Non-U.S. | Real estate | Level 2
Defined Benefit Plan Disclosure
Total net assets	2	3
Non-U.S. | Real estate | 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	5
Non-U.S. | Derivatives | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	1,490	239
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	1,490	239
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	258	318
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	258	318	312
Non-U.S. | Cash and short-term investments | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure
Total net assets	75	122
Non-U.S. | Cash and short-term investments | Level 1
Defined Benefit Plan Disclosure
Total net assets	69	117
Non-U.S. | Cash and short-term investments | Level 2
Defined Benefit Plan Disclosure
Total net assets	6	5
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	(2,436)	(1,578)
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	(2,436)	(1,578)
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	16	19
Pension Plans | U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 10,145	$ 12,977	13,309
Allocable interest (as a percent)	98.00%	98.00%
Pension Plans | Non-U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 6,086	$ 7,614	7,831
Postretirement Benefit Plans | U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 253	$ 319	331
Allocable interest (as a percent)	2.00%	2.00%
Postretirement Benefit Plans | Non-U.S.
Defined Benefit Plan Disclosure
Total net assets	$ 855	$ 1,043	$ 1,146