v3.25.4
POSTRETIREMENT BENEFIT PLANS - Plan Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Change in plan assets        
Funded status – surplus (deficit)       $ (4,045)
Pension Plans        
Change in plan assets        
Funded status – surplus (deficit)       (2,835)
Pension Plans | U.S. Plans        
Change in projected benefit obligations        
Balance at January 1 $ 18,241 $ 19,363    
Service cost 4 35 $ 35  
Interest cost 996 970 1,022  
Participant contributions 0 4    
Actuarial loss (gain) – net 591 (799)    
Benefits paid (1,266) (1,332)    
Settlements 0 0    
Special termination cost 3 0    
Acquisitions/Divestitures/Mergers 0 0    
Exchange rate adjustments 0 0    
Balance at December 31 18,569 18,241 19,363  
Change in plan assets        
Balance at January 1 14,378 15,485    
Actual gain (loss) on plan assets 1,443 49    
Employer contributions 176 172    
Participant contributions 0 4    
Benefits paid (1,266) (1,332)    
Acquisitions/Divestitures/Mergers 0 0    
Exchange rate adjustments 0 0    
Balance at December 31 14,731 14,378 15,485  
Funded status – surplus (deficit) (3,838) (3,863)    
Pension Plans | International Plans        
Change in projected benefit obligations        
Balance at January 1 2,957 3,385    
Service cost 21 20 20  
Interest cost 151 141 139  
Participant contributions 1 0    
Actuarial loss (gain) – net (122) (357)    
Benefits paid (136) (131)    
Settlements (8) (4)    
Special termination cost 0 0    
Acquisitions/Divestitures/Mergers 33 0    
Exchange rate adjustments 252 (96)    
Balance at December 31 3,148 2,957 3,385  
Change in plan assets        
Balance at January 1 3,276 3,733    
Actual gain (loss) on plan assets 14 (263)    
Employer contributions 41 30    
Participant contributions 1 0    
Benefits paid (144) (136)    
Acquisitions/Divestitures/Mergers 72 0    
Exchange rate adjustments 269 (89)    
Balance at December 31 3,528 3,276 3,733  
Funded status – surplus (deficit) 380 319    
Other Postretirement Benefits Plan        
Change in projected benefit obligations        
Balance at January 1 1,016 1,133    
Service cost 6 7 6  
Interest cost 50 54 59  
Participant contributions 14 16    
Actuarial loss (gain) – net (45) (48)    
Benefits paid (134) (146)    
Settlements 0 0    
Special termination cost 1 0    
Acquisitions/Divestitures/Mergers 0 0    
Exchange rate adjustments 0 0    
Balance at December 31 908 1,016 1,133  
Change in plan assets        
Balance at January 1 0 0    
Actual gain (loss) on plan assets 0 0    
Employer contributions 120 130    
Participant contributions 14 16    
Benefits paid (134) (146)    
Acquisitions/Divestitures/Mergers 0 0    
Exchange rate adjustments 0 0    
Balance at December 31 0 0 $ 0  
Funded status – surplus (deficit) $ (908) $ (1,016)   $ (1,210)