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Revenue Recognition (Disaggregation Of Revenue Narrative) (Details) - USD ($)
$ in Millions
4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Lease revenue $ 21 $ 42 $ 63 $ 67
Successor [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue, Remaining Performance Obligation, Amount     $ 1,279  
Northwest Operations [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Transition services revenue       $ 30