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RETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension plan | United States pension benefit expense        
Retirement benefits plans expense        
Service cost $ 23 $ 25 $ 46 $ 50
Interest cost 34 31 68 61
Expected return on plan assets (59) (64) (117) (127)
Amortization 16 23 31 47
Total 14 15 28 31
Settlements 13 11 23 25
Total expense 27 26 51 56
Pension plan | Non-United States pension benefit expense        
Retirement benefits plans expense        
Service cost 15 16 29 32
Interest cost 14 13 29 27
Expected return on plan assets (27) (26) (54) (53)
Amortization 9 10 19 20
Total 11 13 23 26
Settlements 1 0 1 0
Total expense 12 13 24 26
Other postretirement benefits expense        
Retirement benefits plans expense        
Service cost 1 0 1 1
Interest cost 4 4 7 7
Expected return on plan assets (1) (1) (1) (2)
Amortization (4) (3) (7) (6)
Total 0 0 0 0
Settlements 0 0 0 0
Total expense $ 0 $ 0 $ 0 $ 0