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Pension and Postretirement Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2024
Sep. 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     $ 795  
Impact of remeasurement   $ 70 $ 220    
U.S. Pension Plans          
Benefit Plan Information          
Company contributions       108  
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  
U.S. Pension Plans | Maximum          
Benefit Plan Information          
Estimated pension contributions for current fiscal year       200  
Postretirement Benefits          
Benefit Plan Information          
Company contributions       $ 8  
Discount rate   5.19%      
Percentage increase (decrease) in discount rate obligation from the prior year   25.00%