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ACCUMULATED OTHER COMPREHENSIVE INCOME - Summary of Changes in AOCI by Component (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning of year $ 8,726 $ 7,912 $ 7,866
Other comprehensive income (loss) before reclassifications (156) 309  
Amounts reclassified from AOCI 90 87  
Net other comprehensive (loss) income (66) 396 274
End of year 9,121 8,726 7,912
CTA      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning of year (2,587) (2,954)  
Other comprehensive income (loss) before reclassifications (320) 367  
Amounts reclassified from AOCI 0 0  
Net other comprehensive (loss) income (320) 367  
End of year (2,907) (2,587) (2,954)
Pension and OPEB plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning of year (574) (715)  
Other comprehensive income (loss) before reclassifications 160 59  
Amounts reclassified from AOCI 67 82  
Net other comprehensive (loss) income 227 141  
End of year (347) (574) (715)
Hedging activities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning of year (153)    
Other comprehensive income (loss) before reclassifications 4    
Amounts reclassified from AOCI 23    
Net other comprehensive (loss) income 27    
End of year (126) (153)  
Hedging activities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning of year (153) (41)  
Other comprehensive income (loss) before reclassifications   (117)  
Amounts reclassified from AOCI   5  
Net other comprehensive (loss) income   (112)  
End of year   (153) (41)
Accumulated Other Comprehensive Income (Loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning of year (3,314) (3,710)  
End of year $ (3,380) $ (3,314) $ (3,710)