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Income Tax (Net Operating Loss Carryforward) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards $ 1,066
No Expiration And No Valuation Allowance [Member]  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards 423
Full Valuation Allowance [Member]  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards 126
No Expiration And Partial Valuation Allowance [Member]  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards 505
Expiration Date Of 2034 And No Valuation Allowance  
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards $ 12