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Postretirement Benefit Plans (Amounts Recognized in OCI) (Details) - Other Benefits - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure      
Interest cost $ 1 $ 1 $ 2
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 2 2 3
Amortization of net actuarial loss 1 2 2
Net periodic benefit cost $ 0 $ 1 $ 1