Financial Instruments - Contractual Maturities (Details) $ in Millions	Jun. 30, 2025 USD ($)
Amortized Cost
Due within one year	$ 68,262
Due after one year through five years	7,911
Due after five years through ten years	610
Due after ten years	903
Amortized cost	77,686
Estimated Fair Value
Due within one year	68,246
Due after one year through five years	7,928
Due after five years through ten years	607
Due after ten years	879
Estimated fair value	$ 77,660