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Employee Benefit Plans (Changes in Fair Value of Level 3 Pension and Post Retirement Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Level 3 | Corporate Bond Securities    
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Plan assets at beginning of period $ 0 $ 0
Actual return on assets:    
Relating to assets still held at the reporting date 0 0
Relating to assets sold during the period 0 0
Purchases 12 0
Sales (3) 0
Issuances 0 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Plan assets at end of period 9 0
Postretirement    
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Plan assets at beginning of period 1,191 1,621
Actual return on assets:    
Plan assets at end of period 1,186 1,191
Other | Level 3 | Fixed Maturities    
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Plan assets at beginning of period 65 42
Actual return on assets:    
Relating to assets still held at the reporting date 0 0
Relating to assets sold during the period 0 0
Purchases 0 0
Sales 0 0
Issuances 82 65
Settlements (65) (42)
Transfers in and/or out of Level 3 0 0
Plan assets at end of period 82 65
Partnerships | Level 3 | Real Estate    
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Plan assets at beginning of period 1,004 998
Actual return on assets:    
Relating to assets still held at the reporting date (57) 56
Relating to assets sold during the period 0 0
Purchases (5) (50)
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Plan assets at end of period 942 1,004
Partnerships | Level 3 | Other invested assets    
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Plan assets at beginning of period 1,713 1,800
Actual return on assets:    
Relating to assets still held at the reporting date 197 (92)
Relating to assets sold during the period 0 0
Purchases 232 5
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Plan assets at end of period 2,142 1,713
Hedge Fund | Level 3 | Other invested assets    
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Plan assets at beginning of period 1,455 1,304
Actual return on assets:    
Relating to assets still held at the reporting date 121 33
Relating to assets sold during the period 0 0
Purchases (81) 118
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Plan assets at end of period $ 1,495 $ 1,455