Derivatives, Hedging Activities and Interest Expense - Components of Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments Gain Loss [Line Items]
Interest expense on debt	$ 1,087	$ 446
Interest income on derivatives	(209)	(62)
Interest expense on debt and derivatives	878	384
Losses (gains) on debt denominated in foreign currencies	36	(591)
Losses on foreign currency swaps	44	712
Total interest expense	899	563
Interest Expense
Derivative Instruments Gain Loss [Line Items]
(Gains) losses on U.S. dollar interest rate swaps	$ (59)	$ 58