Financial Instruments - Contractual Maturities (Details) $ in Millions	Mar. 31, 2023 USD ($)
Amortized Cost
Due within one year	$ 41,857
Due after one year through five years	7,130
Due after five years through ten years	594
Due after ten years	1,651
Amortized cost	51,232
Estimated Fair Value
Due within one year	41,801
Due after one year through five years	6,675
Due after five years through ten years	562
Due after ten years	1,559
Estimated fair value	$ 50,597