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ACCUMULATED OTHER COMPREHENSIVE INCOME - Summary of Changes in AOCI by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period $ 8,490 $ 7,730 $ 8,726 $ 7,912
Other comprehensive income (loss) before reclassifications     (111) (299)
Amounts reclassified from AOCI     49 21
Total other comprehensive income (loss), net of tax 104 189 (62) (278)
End of period 8,535 8,160 8,535 8,160
CTA        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period     (2,587) (2,954)
Other comprehensive income (loss) before reclassifications     (120) (170)
Amounts reclassified from AOCI     0 0
Total other comprehensive income (loss), net of tax     (120) (170)
End of period (2,707) (3,124) (2,707) (3,124)
Pension and OPEB plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period     (574) (715)
Other comprehensive income (loss) before reclassifications     8 2
Amounts reclassified from AOCI     33 24
Total other comprehensive income (loss), net of tax     41 26
End of period (533) (689) (533) (689)
Hedging activities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period     (153) (41)
Other comprehensive income (loss) before reclassifications     1 (131)
Amounts reclassified from AOCI     16 (3)
Total other comprehensive income (loss), net of tax     17 (134)
End of period (136) (175) (136) (175)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of period     (3,314) (3,710)
End of period $ (3,376) $ (3,988) $ (3,376) $ (3,988)