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Employee Benefits - Net Postretirement Benefit Cost and the Amount Recognized in OCI for All Funded and Unfunded Plans (Details) - Other Postretirement Benefit Plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Interest cost on APBO $ 2 $ 2 $ 2
Expected return on plan assets (2) (2) (2)
Amortization of prior service credit (1) (1) (1)
Amortization of gains (1) (1) (1)
Net postretirement benefit cost (2) (2) (2)
Other changes in plan assets and benefit obligations recognized in OCI:      
Net (gain) loss 1 1 1
Amortization of prior service credit 1 1 1
Total recognized in comprehensive income 2 2 2
Total recognized in net pension cost and comprehensive income $ 0 $ 0 $ 0