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RETIREMENT BENEFITS - Level 3 Roll Forward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
U.S.    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year $ 13,062  
Plan assets at fair value at year end 13,640 $ 13,062
U.S. | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 76 128
Realized (losses) (3) (7)
Unrealized gains (losses) 3 12
Purchases, sales, and issuances (18) (57)
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 58 76
U.S. | Debt securities | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 0  
Plan assets at fair value at year end 0 0
U.S. | Annuity contracts | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 1 1
Realized (losses) 0 0
Unrealized gains (losses) 0 0
Purchases, sales, and issuances 0 0
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 1 1
U.S. | Other investments | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 75 127
Realized (losses) (3) (7)
Unrealized gains (losses) 3 12
Purchases, sales, and issuances (18) (57)
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 57 75
Non-U.S.    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 8,683  
Plan assets at fair value at year end 8,977 8,683
Non-U.S. | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 290 230
Unrealized gains (losses) 24 8
Purchases, sales, and issuances 5 52
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 319 290
Non-U.S. | Debt securities | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 10 9
Unrealized gains (losses) 0 1
Purchases, sales, and issuances (10) 0
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 0 10
Non-U.S. | Real estate | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 1 1
Unrealized gains (losses) 1 0
Purchases, sales, and issuances 0 0
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 2 1
Non-U.S. | Annuity contracts | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 5 10
Unrealized gains (losses) 0 0
Purchases, sales, and issuances 0 (5)
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end 5 5
Non-U.S. | Other investments | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Plan assets at fair value at beginning of year 274 210
Unrealized gains (losses) 23 7
Purchases, sales, and issuances 15 57
Transfers in and/or out of Level 3 0 0
Plan assets at fair value at year end $ 312 $ 274