v3.25.2
Fair Value Measurements And Disclosure (Narrative) (Details) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Fair Value Disclosures [Abstract]    
Available-for-sale debt securities $ 671,000,000 $ 689,000,000
Available-for-sale debt securities - maturities less than 1 year 71,000,000  
Available-for-sale debt securities - maturities within 1 to 3 years 107,000,000  
Available-for-sale debt securities - maturities within 3 to 5 years 113,000,000  
Available-for-sale debt securities - maturities for 5 or more years 380,000,000  
Fair Value, Option, Quantitative Disclosures [Line Items]    
Anticipated reclassification of holding losses during the next 12 months - cash flow hedges 59,000,000  
Collateral submitted to counterparty 355,000,000 188,000,000
Collateral received from counterparty 404,000,000 $ 0
Collateral contingently payable to the counterparty 50,000,000  
Measurement Input, Entity Credit Risk    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral contingently payable to the counterparty $ 1,312,000,000