Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, net discrete tax benefit	$ 141
Effective income tax rate reconciliation, release of valuation allowance		$ 154
Tax expense (benefit), intra-entity transfers of assets other than inventory, amount		(147)
Tax expense (benefit), share-based payment arrangement			$ (55)
Unrecognized tax benefits	1,400	1,400
Unrecognized tax benefits that would impact effective tax rate	1,300	1,300
Minimum
Income Tax Contingency [Line Items]
Tax liability increase due to proposed adjustment to taxable income	600	600
Maximum
Income Tax Contingency [Line Items]
Tax liability increase due to proposed adjustment to taxable income	$ 700	$ 700