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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes in AOCI (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance as of beginning of period $ 14,435 $ 14,269  
Balance as of end of period 3,026 14,690  
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance as of beginning of period (1,253) (1,215)  
Other comprehensive income before reclassifications, net (488) 93  
Amounts reclassified, pre-tax 6 3  
Tax expense (benefit) reclassified (1)    
ASU 2018-02 adoption impact     $ (9)
Balance as of end of period (1,736) (1,128)  
Foreign Currency Translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance as of beginning of period (780) (834)  
Other comprehensive income before reclassifications, net (488) 91  
Amounts reclassified, pre-tax 0 0  
Tax expense (benefit) reclassified 0    
ASU 2018-02 adoption impact     0
Balance as of end of period (1,268) (743)  
Defined Benefit Pension and Post-retirement Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance as of beginning of period (473) (381)  
Other comprehensive income before reclassifications, net 0 2  
Amounts reclassified, pre-tax 6 3  
Tax expense (benefit) reclassified (1)    
ASU 2018-02 adoption impact     $ (9)
Balance as of end of period $ (468) $ (385)