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Income Taxes (Narrative) (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2023
AUD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2017
Dec. 31, 2015
USD ($)
Income Tax Disclosure [Abstract]            
Payments for ATO Settlement   $ 83   $ 62    
Sale of Stock, Percentage of Ownership before Transaction         77.60%  
Proceeds from Divestiture of Businesses           $ 1,200
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax $ 0   $ 0 $ (62)   $ 979
Deferred Tax Assets, Valuation Allowance $ (2)   $ (2)