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RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure      
Percentage of the significant plans over global pension and postretirement liabilities, which utilize quarterly measurement policy 90.00%    
Amortization of unrecognized      
Total net expense (benefit) $ 9 $ 9 $ (18)
U.S. | Pension Plans      
Defined Benefit Plan, Net Periodic Benefit Cost      
Benefits earned during the year 0 1 1
Interest cost on benefit obligation 378 469 514
Expected return on assets (824) (821) (844)
Amortization of unrecognized      
Prior service cost (benefit) 2 2 2
Net actuarial loss 233 200 165
Curtailment loss (gain) 0 1 1
Settlement (gain) loss 0 0 0
Total net expense (benefit) (211) (148) (161)
U.S. | Postretirement Benefit Plans      
Defined Benefit Plan, Net Periodic Benefit Cost      
Benefits earned during the year 0 0 0
Interest cost on benefit obligation 17 24 26
Expected return on assets (17) (18) (14)
Amortization of unrecognized      
Prior service cost (benefit) (2) 0 0
Net actuarial loss 0 0 (1)
Curtailment loss (gain) 0 0 0
Settlement (gain) loss 0 0 0
Total net expense (benefit) (2) 6 11
Non-U.S. | Pension Plans      
Defined Benefit Plan, Net Periodic Benefit Cost      
Benefits earned during the year 147 146 146
Interest cost on benefit obligation 246 287 292
Expected return on assets (245) (281) (291)
Amortization of unrecognized      
Prior service cost (benefit) 5 (4) (4)
Net actuarial loss 70 61 53
Curtailment loss (gain) (8) (6) (1)
Settlement (gain) loss (1) 6 7
Total net expense (benefit) 214 209 202
Non-U.S. | Postretirement Benefit Plans      
Defined Benefit Plan, Net Periodic Benefit Cost      
Benefits earned during the year 7 8 9
Interest cost on benefit obligation 93 104 102
Expected return on assets (77) (84) (88)
Amortization of unrecognized      
Prior service cost (benefit) (9) (10) (10)
Net actuarial loss 20 23 29
Curtailment loss (gain) 0 0 0
Settlement (gain) loss 0 0 0
Total net expense (benefit) $ 34 $ 41 $ 42