Financial Instruments - Contractual Maturities (Details) $ in Millions	Mar. 31, 2025 USD ($)
Amortized Cost
Due within one year	$ 71,764
Due after one year through five years	6,436
Due after five years through ten years	538
Due after ten years	785
Amortized cost	79,523
Estimated Fair Value
Due within one year	71,743
Due after one year through five years	6,423
Due after five years through ten years	534
Due after ten years	756
Estimated fair value	$ 79,456