v3.26.1
Fair Value Measurements And Disclosure (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Fair Value Disclosures [Abstract]    
Available-for-sale debt securities $ 583 $ 587
Available-for-sale debt securities - maturities less than 1 year 55  
Available-for-sale debt securities - maturities within 1 to 3 years 151  
Available-for-sale debt securities - maturities within 3 to 5 years 118  
Available-for-sale debt securities - maturities for 5 or more years 259  
Fair Value, Option, Quantitative Disclosures [Line Items]    
Anticipated reclassification of holding losses during the next 12 months - cash flow hedges 59  
Collateral submitted to counterparty 28 513
Collateral received from counterparty 183 $ 314
Collateral contingently payable to the counterparty 60  
Measurement Input, Entity Credit Risk    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral contingently payable to the counterparty $ 2,219