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Income Taxes - Effective Tax Rate Reconciliation, Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Income Tax Disclosure [Abstract]      
Effective income tax rate reconciliation, foreign tax rate differential, amount $ 145    
Effective income tax rate reconciliation, foreign tax rate differential, percent 23.00% (152.30%) 2.30%
Effective income tax rate reconciliation, tax credits, amount $ 84 $ 101 $ 71
Effective income tax rate reconciliation, tax credits, percent 13.30% 92.70% (8.00%)
Effective income tax rate reconciliation, U.S. tax on foreign income, amount $ 59 $ 39 $ 51
Effective income tax rate reconciliation, U.S. tax on foreign income, percent 9.40% 35.80% (5.80%)
Effective income tax rate reconciliation, uncertain tax positions, amount $ 52    
Change in uncertain tax positions (8.30%) 0.00% (1.20%)
Effective income tax rate reconciliation, loss on investments, amount   $ 160  
Effective income tax rate reconciliation, loss on investments, percent   146.80%  
Effective income tax rate reconciliation, withholding taxes, amount   $ 64  
Effective income tax rate reconciliation, withholding taxes, percent 2.10% 58.70% (3.50%)
Effective income tax rate reconciliation, remeasurement of deferred tax assets and liabilities, amount     $ (81)
Effective income tax rate reconciliation, remeasurement of deferred tax assets and liabilities, percent 0.30% (26.60%) 9.10%
Effective income tax rate reconciliation, divestiture of business, amount     $ (67)
Effective income tax rate reconciliation, divestiture of business, percent 0.20% (5.50%) 7.60%
Valuation allowance $ 2,242 $ 2,264  
Net increase in deferred tax asset valuation allowance $ 22