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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Cash Equivalents [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Held-to-maturity securities $ 1,122 $ 2,179 $ 1,003
Marketable Securities [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Held-to-maturity securities 1 63 99
Debt Securities, Available-for-sale [Line Items]      
Available - for- sale securities 75 0 21
Other Assets [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available - for- sale securities $ 27 $ 97 $ 81