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Fair Value Measurements And Disclosure (Long-Term Debt And Other Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes and debentures $ 126,253 $ 133,402
Commercial paper 2,693 2,091
Investment securities 2,972 2,836
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes and debentures 117,290 128,474
Commercial paper 2,693 2,091
Investment securities $ 2,972 $ 2,836