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EMPLOYEE BENEFITS (Details - Components of net periodic benefit cost with respect to pensions and other postretirement benefits) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pensions        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 7 $ 7 $ 15 $ 15
Interest cost 47 44 95 89
Expected return on assets (63) (76) (125) (154)
Amortization of prior service cost (credit) 1 0 1 1
Amortization of net (gain) loss 10 9 19 18
Net periodic benefit cost (credit) 2 (16) 5 (31)
Settlement charges (1) 0 3 0
Net benefit cost (credit) 3 (16) 2 (31)
Pensions | U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 2 5 4
Interest cost 43 40 87 81
Expected return on assets (57) (70) (114) (141)
Amortization of prior service cost (credit) 0 0 0 0
Amortization of net (gain) loss 8 7 16 14
Net periodic benefit cost (credit) (3) (21) (6) (42)
Settlement charges 0 0 0 0
Net benefit cost (credit) (3) (21) (6) (42)
Pensions | Non U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 5 10 11
Interest cost 4 4 8 8
Expected return on assets (6) (6) (11) (13)
Amortization of prior service cost (credit) 1 0 1 1
Amortization of net (gain) loss 2 2 3 4
Net periodic benefit cost (credit) 5 5 11 11
Settlement charges (1) 0 3 0
Net benefit cost (credit) 6 5 8 11
Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 2 1 2
Interest cost 1 2 4 4
Expected return on assets 0 0 0 0
Amortization of prior service cost (credit) 0 (2) (1) (2)
Amortization of net (gain) loss (1) 0 (1) 0
Net periodic benefit cost (credit) 1 2 3 4
Settlement charges 0 0 0 0
Net benefit cost (credit) 1 2 3 4
Postretirement Plans | U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 1 1
Interest cost 1 1 3 3
Expected return on assets 0 0 0 0
Amortization of prior service cost (credit) 0 (1) 0 (1)
Amortization of net (gain) loss (1) 0 (1) 0
Net periodic benefit cost (credit) 1 1 3 3
Settlement charges 0 0 0 0
Net benefit cost (credit) 1 1 3 3
Postretirement Plans | Non U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 0 1
Interest cost 0 1 1 1
Expected return on assets 0 0 0 0
Amortization of prior service cost (credit) 0 (1) (1) (1)
Amortization of net (gain) loss 0 0 0 0
Net periodic benefit cost (credit) 0 1 0 1
Settlement charges 0 0 0 0
Net benefit cost (credit) $ 0 $ 1 $ 0 $ 1