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Pension and Other Postretirement Employee Benefit Plans - Investment Strategy and Weighted Average Asset Allocation (Details) - USD ($)
$ in Billions
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Investments sponsored or managed by affiliates $ 1.7 $ 2.5
Defined benefit pension plans | Debt securities | Minimum | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Asset allocation 42.00%  
Defined benefit pension plans | Debt securities | Maximum | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Asset allocation 100.00%  
Defined benefit pension plans | Equity securities | Minimum | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Asset allocation 0.00%  
Defined benefit pension plans | Equity securities | Maximum | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Asset allocation 40.00%  
Defined benefit pension plans | Real estate | Minimum | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Asset allocation 0.00%  
Defined benefit pension plans | Real estate | Maximum | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Asset allocation 3.00%  
Defined benefit pension plans | Alternatives | Minimum | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Asset allocation 0.00%  
Defined benefit pension plans | Alternatives | Maximum | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Asset allocation 12.00%