Financial Instruments - Contractual Maturities (Details) $ in Millions	Sep. 30, 2024 USD ($)
Amortized Cost
Due within one year	$ 69,997
Due after one year through five years	2,536
Due after five years through ten years	352
Due after ten years	602
Amortized cost	73,487
Estimated Fair Value
Due within one year	69,976
Due after one year through five years	2,481
Due after five years through ten years	345
Due after ten years	570
Estimated fair value	$ 73,372