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PENSION BENEFITS (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Payments for Repurchase of Common Stock     $ 3,650,000,000 $ 2,308,000,000
United States, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Payments for Repurchase of Common Stock $ 100,000,000   300,000,000  
Service cost 21,000,000 $ 35,000,000 63,000,000 105,000,000
Interest cost 153,000,000 143,000,000 460,000,000 430,000,000
Expected return on plan assets (279,000,000) (357,000,000) (837,000,000) (1,071,000,000)
Amortization of prior service (credit) (11,000,000) (11,000,000) (33,000,000) (33,000,000)
Net periodic benefit (income) (116,000,000) (190,000,000) (347,000,000) (569,000,000)
Non-US, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4,000,000 6,000,000 16,000,000 20,000,000
Interest cost 34,000,000 35,000,000 106,000,000 108,000,000
Expected return on plan assets (81,000,000) (108,000,000) (248,000,000) (336,000,000)
Amortization of prior service (credit) 0 0 0 (1,000,000)
Net periodic benefit (income) $ (43,000,000) $ (67,000,000) $ (126,000,000) $ (209,000,000)