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Employee Benefits - Plans ABO in Excess of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]    
ABO $ 922 $ 965
Cash Balance Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
PBO 793 828
ABO 793 828
Fair value of plan assets 827 886
Other Defined Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
PBO 128 137
ABO 128 137
Fair value of plan assets $ 0 $ 0