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Debt (Estimated Fair Value of Significant Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt $ 1,169 $ 1,619
Long-term debt 12,300 11,844
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt 1,159 1,610
Long-term debt $ 11,915 $ 11,723