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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Principal Plans      
Fair value of plan assets $ 2,018 $ 3,389  
Principal Plans | Fair Value, Inputs, Level 1      
Fair value of plan assets 219 265  
Principal Plans | Fair Value, Inputs, Level 2      
Fair value of plan assets 226 337  
Principal Plans | Fair Value, Inputs, Level 3      
Fair value of plan assets 222 355  
Principal Plans | Cash and Cash Equivalents      
Fair value of plan assets 69 50  
Principal Plans | Cash and Cash Equivalents | Net Asset Value or Its Equivalent      
Fair value of plan assets 76 26  
Principal Plans | Cash and Cash Equivalents | Fair Value, Inputs, Level 1      
Fair value of plan assets 69 50  
Principal Plans | U.S. government and municipals      
Fair value of plan assets 115 166  
Principal Plans | U.S. government and municipals | Net Asset Value or Its Equivalent      
Fair value of plan assets 71 149  
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 1      
Fair value of plan assets 115 158  
Principal Plans | U.S. government and municipals | Fair Value, Inputs, Level 2      
Fair value of plan assets   8  
Principal Plans | U.S. corporate debt      
Fair value of plan assets 193 293  
Principal Plans | U.S. corporate debt | Net Asset Value or Its Equivalent      
Fair value of plan assets 419 646  
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 1      
Fair value of plan assets   7  
Principal Plans | U.S. corporate debt | Fair Value, Inputs, Level 2      
Fair value of plan assets 193 286  
Principal Plans | International bonds      
Fair value of plan assets 33 43  
Principal Plans | International bonds | Net Asset Value or Its Equivalent      
Fair value of plan assets 549 1,144  
Principal Plans | International bonds | Fair Value, Inputs, Level 2      
Fair value of plan assets 33 43  
Principal Plans | U.S. Equity      
Fair value of plan assets   17  
Principal Plans | U.S. Equity | Fair Value, Inputs, Level 1      
Fair value of plan assets   17  
Principal Plans | International Equity      
Fair value of plan assets   32  
Principal Plans | International Equity | Fair Value, Inputs, Level 1      
Fair value of plan assets   32  
Principal Plans | Non-U.S. Equity | Net Asset Value or Its Equivalent      
Fair value of plan assets   46  
Principal Plans | Global equity      
Fair value of plan assets 221    
Principal Plans | Global equity | Net Asset Value or Its Equivalent      
Fair value of plan assets   423  
Principal Plans | Insurance Contract      
Fair value of plan assets 222 355  
Principal Plans | Insurance Contract | Fair Value, Inputs, Level 3      
Fair value of plan assets 222 355  
Principal Plans | Other      
Fair value of plan assets (1) (1)  
Principal Plans | Other | Fair Value, Inputs, Level 1      
Fair value of plan assets (1) 1  
Principal Plans | Defined Benefit Plan, Equity Securities, Non-US      
Fair value of plan assets 15    
Principal Plans | Defined Benefit Plan, Equity Securities, Non-US | Fair Value, Inputs, Level 1      
Fair value of plan assets 15    
Principal Plans | Defined Benefit Plan, Equity Securities, US      
Fair value of plan assets 21    
Principal Plans | Defined Benefit Plan, Equity Securities, US | Fair Value, Inputs, Level 1      
Fair value of plan assets 21    
Defined Benefit Pension Plans      
Fair value of plan assets $ 2,321 $ 3,744 $ 4,193