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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Contingency [Line Items]      
Income tax refunds $ 10    
Income taxes paid   $ 0 $ 8
Valuation allowance 243 $ 180  
Gross tax liability for tax positions that may not be sustained under a more likely than not threshold 7    
Valuation allowance, net of federal benefit $ 308    
Research Tax Credit Carryforward [Member]      
Income Tax Contingency [Line Items]      
Tax credit expiration year 2041    
Research and development credits $ 14    
Internal Revenue Service (IRS) [Member]      
Income Tax Contingency [Line Items]      
Operating loss carryforward 2,100    
Tax effects on operating loss carryforwards 443    
Internal Revenue Service (IRS) [Member] | Indefinite Tax Period [Member]      
Income Tax Contingency [Line Items]      
Operating loss carryforward 1,768    
Tax effects on operating loss carryforwards $ 371    
State and Local Jurisdiction [Member]      
Income Tax Contingency [Line Items]      
Tax credit expiration year 2024    
Various tax credits $ 48    
State and Local Jurisdiction [Member] | State Net Operating Loss Carryforward [Member]      
Income Tax Contingency [Line Items]      
Operating loss carryforward $ 4,400    
Tax credit expiration year 2042    
Minimum [Member] | Internal Revenue Service (IRS) [Member]      
Income Tax Contingency [Line Items]      
Tax credit expiration year 2036    
Maximum [Member] | Internal Revenue Service (IRS) [Member]      
Income Tax Contingency [Line Items]      
Tax credit expiration year 2037