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Postretirement Benefits - Asset Allocation (Details) - Employee Pension Plan
Dec. 31, 2023
Dec. 31, 2022
Target asset allocation for the portfolio:    
Total plan assets 100.00% 100.00%
Actual asset allocation for the portfolio:    
Total plan assets 100.00% 100.00%
Total equity securities    
Target asset allocation for the portfolio:    
Total plan assets 45.00% 45.00%
Actual asset allocation for the portfolio:    
Total plan assets 45.00% 46.00%
U.S. equity securities    
Target asset allocation for the portfolio:    
Total plan assets 27.00% 27.00%
Actual asset allocation for the portfolio:    
Total plan assets 26.00% 27.00%
U.S. small capitalization core equity    
Target asset allocation for the portfolio:    
Total plan assets 100.00%  
Non-U.S. equity securities    
Target asset allocation for the portfolio:    
Total plan assets 18.00% 18.00%
Actual asset allocation for the portfolio:    
Total plan assets 19.00% 19.00%
International small capitalization risk controlled equity    
Target asset allocation for the portfolio:    
Total plan assets 11.00%  
International emerging markets equity    
Target asset allocation for the portfolio:    
Total plan assets 19.00%  
International risk controlled equity    
Target asset allocation for the portfolio:    
Total plan assets 70.00%  
Debt securities    
Target asset allocation for the portfolio:    
Total plan assets 54.00% 54.00%
Actual asset allocation for the portfolio:    
Total plan assets 54.00% 53.00%
U.S. Treasury Strips    
Target asset allocation for the portfolio:    
Total plan assets 60.00%  
U.S. corporate bonds with an emphasis on long duration bonds rated A or better    
Target asset allocation for the portfolio:    
Total plan assets 40.00%  
Other    
Target asset allocation for the portfolio:    
Total plan assets 1.00% 1.00%
Actual asset allocation for the portfolio:    
Total plan assets 1.00% 1.00%