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RETIREMENT BENEFITS - Net (Benefit) Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
U.S. | Pension Plans        
Service-related expense        
Benefits earned during the period $ 0 $ 1 $ 1 $ 2
Interest cost on benefit obligation 132 131 381 406
Expected return on plan assets (210) (217) (634) (650)
Amortization of unrecognized:        
Prior service benefit 0 0 0 1
Net actuarial loss 39 45 128 129
Curtailment loss 0 1 1 4
Settlement loss 0 0 0 0
Total net (benefit) expense (39) (39) (123) (108)
U.S. | Postretirement Benefit Plans        
Service-related expense        
Benefits earned during the period 0 0 0 0
Interest cost on benefit obligation 6 9 19 20
Expected return on plan assets (4) (2) (10) (5)
Amortization of unrecognized:        
Prior service benefit 0 0 0 0
Net actuarial loss 0 0 0 0
Curtailment loss 0 0 0 0
Settlement loss 0 0 0 0
Total net (benefit) expense 2 7 9 15
Non-U.S. plans | Pension Plans        
Service-related expense        
Benefits earned during the period 35 38 111 112
Interest cost on benefit obligation 73 76 220 221
Expected return on plan assets (71) (77) (221) (223)
Amortization of unrecognized:        
Prior service benefit (1) (1) (3) (3)
Net actuarial loss 14 15 41 46
Curtailment loss 0 0 0 0
Settlement loss 0 4 5 8
Total net (benefit) expense 50 55 153 161
Non-U.S. plans | Postretirement Benefit Plans        
Service-related expense        
Benefits earned during the period 2 3 7 7
Interest cost on benefit obligation 26 27 77 76
Expected return on plan assets (22) (24) (67) (67)
Amortization of unrecognized:        
Prior service benefit (2) (2) (7) (7)
Net actuarial loss 7 8 22 25
Curtailment loss 0 0 0 0
Settlement loss 0 0 0 0
Total net (benefit) expense $ 11 $ 12 $ 32 $ 34