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Pension and Postretirement Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2024
Apr. 01, 2024
Benefit Plan Information        
Discontinued operation, pension plan benefit obligation       $ 2,700
Discontinued operation, postretirement plan benefit obligation       $ 2,400
Settlements, curtailments, special termination benefits and other $ 795      
Impact of remeasurement   $ 70 $ 220  
U.S. Pension Plans        
Benefit Plan Information        
Company contributions     $ 81  
Pension payment obligations transferred $ 2,500      
U.S. Pension Plans | United States        
Benefit Plan Information        
Discount rate 5.43% 5.22% 5.43%  
Percentage increase (decrease) in discount rate obligation from the prior year   24.00%    
U.S. Pension Plans | Minimum        
Benefit Plan Information        
Estimated pension contributions for current fiscal year $ 100   $ 100  
U.S. Pension Plans | Maximum        
Benefit Plan Information        
Estimated pension contributions for current fiscal year $ 200   200  
Postretirement Benefits        
Benefit Plan Information        
Company contributions     $ 5  
Discount rate   5.19%    
Percentage increase (decrease) in discount rate obligation from the prior year   25.00%