v3.24.3
Fair Value Measurements And Disclosure (Long-Term Debt And Other Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes and debentures $ 127,501 $ 133,402
Commercial paper 0 2,091
Investment securities 3,092 2,836
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes and debentures 124,536 128,474
Commercial paper 0 2,091
Investment securities $ 3,092 $ 2,836