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Postretirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure      
Net loss $ (101) $ (51) $ 78
Total recognized in comprehensive income (8) 2 (2)
Other Benefits      
Defined Benefit Plan Disclosure      
Net loss (9) 0 1
Defined Benefit Plan, Prior Service Credit 0 0 (5)
Amortization of prior service credit 2 3 3
Amortization of net actuarial loss (1) (2) (2)
Change recognized in other comprehensive loss $ (8) $ 1 $ (3)