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Financing Arrangement - Carrying Values Of Liability And Equity Components Of Notes (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Feb. 11, 2021
Feb. 24, 2016
Debt Instrument [Line Items]        
Net carrying value of Senior Notes $ 1,882 $ 1,880    
2026 Notes        
Debt Instrument [Line Items]        
Long-term debt 400 400   $ 400
2031 Notes        
Debt Instrument [Line Items]        
Long-term debt 750 750 $ 750  
2051 Notes        
Debt Instrument [Line Items]        
Long-term debt 750 750 750  
Senior Notes        
Debt Instrument [Line Items]        
Long-term debt 1,900 1,900    
Unaccreted discount (5) (6) 6 1
Unamortized debt issuance costs (13) (14) $ (16) $ (4)
Fair value of Senior Notes (Level 2) $ 1,515 $ 1,540