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Investments - Estimated Fair Values of Short-term and Long-term Investments Classified as Available-for-Sale Debt Securities by Date of Contractual Maturity (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Investments [Abstract]  
One year or less $ 955
One year through two years 888
Two years through three years 651
Three years through four years 313
Four years through five years 57
Thereafter 36
Estimated Fair Value $ 2,900