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Commitments and Contingencies (Employee Benefits Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
plan
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Number of defined contribution 401 (k) plans | plan 2    
Defined contribution plan, contributions | $ $ 56 $ 45 $ 36