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Financing Arrangement (Senior Notes) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 04, 2016
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Feb. 28, 2022
Feb. 11, 2021
Feb. 24, 2016
Debt Instrument [Line Items]                  
Proceeds from issuance of senior long-term debt $ 395                
Amortization of debt discount (premium)   $ 6              
Interest expense   14 $ 15 $ 29 $ 29        
Senior notes   1,881   1,881   $ 1,880      
Proceeds from debt, net of issuance costs       1,478          
Debt issuance costs, gross   16   16          
2026 Notes                  
Debt Instrument [Line Items]                  
Debt instrument, interest rate, stated percentage                 4.80%
Long-term debt   $ 400   $ 400   400     $ 400
Debt instrument, maturity date Mar. 01, 2026                
Effective interest rate                 4.97%
Debt instrument, convertible, remaining discount amortization period   2 years 4 months 24 days   2 years 4 months 24 days          
2031 Notes                  
Debt Instrument [Line Items]                  
Debt instrument, interest rate, stated percentage               1.85%  
Long-term debt   $ 750   $ 750   750   $ 750  
Debt instrument, maturity date       Feb. 15, 2031          
Effective interest rate             1.98%    
Debt instrument, convertible, remaining discount amortization period   7 years 4 months 24 days   7 years 4 months 24 days          
2051 Notes                  
Debt Instrument [Line Items]                  
Debt instrument, interest rate, stated percentage               2.95%  
Long-term debt   $ 750   $ 750   750   $ 750  
Debt instrument, maturity date       Feb. 15, 2051          
Effective interest rate             3.04%    
Debt instrument, convertible, remaining discount amortization period   27 years 4 months 24 days   27 years 4 months 24 days          
Senior Notes                  
Debt Instrument [Line Items]                  
Long-term debt   $ 1,900   $ 1,900   1,900      
Debt instrument, unamortized discount (premium), net   (5)   (5)   (6)     $ (1)
Debt issuance costs, noncurrent, net   14   $ 14   14     $ 4
Senior notes, frequency of periodic payment semiannually                
Debt instrument, redemption price, percentage       100.00%          
Debt Instrument, Fair Value Disclosure   $ 1,429   $ 1,429   $ 1,540      
Change of control repurchase event                  
Debt Instrument [Line Items]                  
Debt instrument, redemption price, percentage       101.00%