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Postretirement Benefit Plans (Rollforward of Obligation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Change in benefit obligation:      
Benefit obligation at beginning of year $ 1,085    
Benefit obligation at end of year 513 $ 1,085  
Other postretirement benefit plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 42 44  
Interest cost 1 1 $ 2
Benefits paid (3) (3)  
Actuarial gain (9) 0  
Benefit obligation at end of year $ 31 $ 42 $ 44