Derivatives, Hedging Activities and Interest Expense - Components of Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments Gain Loss [Line Items]
Interest expense on debt	$ 446	$ 389
Interest (income) expense on derivatives	(62)	66
Interest expense on debt and derivatives	384	455
(Gains) losses on debt denominated in foreign currencies	(591)	10
Losses on foreign currency swaps	712	25
Total interest expense	563	286
Interest Expense
Derivative Instruments Gain Loss [Line Items]
Losses (gains) on U.S. dollar interest rate swaps	$ 58	$ (204)