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Debt and Financing Activities - Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 10, 2024
Feb. 15, 2024
Jun. 16, 2023
Jun. 15, 2023
Mar. 15, 2023
Feb. 15, 2023
Dec. 15, 2022
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Debt Instrument [Line Items]                    
Debt outstanding               $ 5,700 $ 5,600  
Current portion of long-term debt               1,191 50  
Retired and redeemed outstanding principal amount               519 288 $ 1,274
Purchase of U.S. government obligations for the satisfaction and discharge of long-term debt               $ 0 647 $ 0
Loans payable                    
Debt Instrument [Line Items]                    
Redemption price (percent) 101.00%     101.00%            
Loans payable | Minimum                    
Debt Instrument [Line Items]                    
Debt instrument, redemption period (in days) 10 days     10 days            
Loans payable | Maximum                    
Debt Instrument [Line Items]                    
Debt instrument, redemption period (in days) 60 days     60 days            
4.25% Notes Due September 15, 2029 | Loans payable                    
Debt Instrument [Line Items]                    
Interest rate on debt instruments (percent) 4.25%             4.25%    
Aggregate principal amount $ 500                  
Proceeds from issuance, net $ 496                  
5.25% Notes due February 15, 2026                    
Debt Instrument [Line Items]                    
Interest rate on debt instruments (percent) 5.25%                  
5.25% Notes due February 15, 2026 | Loans payable                    
Debt Instrument [Line Items]                    
Interest rate on debt instruments (percent)               5.25%    
Retired and redeemed outstanding principal amount $ 500                  
Redemption price (percent) 100.00%                  
4.90% Notes Due July 15, 2028 | Loans payable                    
Debt Instrument [Line Items]                    
Interest rate on debt instruments (percent)       4.90%       4.90%    
Aggregate principal amount       $ 400            
Proceeds from issuance, net       $ 397            
5.10% Notes Due July 15, 2033 | Loans payable                    
Debt Instrument [Line Items]                    
Interest rate on debt instruments (percent)       5.10%       5.10%    
Aggregate principal amount       $ 600            
Proceeds from issuance, net       $ 592            
3.80% Notes Due March 15, 2024 | Loans payable                    
Debt Instrument [Line Items]                    
Interest rate on debt instruments (percent)       3.80%            
Retired and redeemed outstanding principal amount     $ 268              
Redemption price (percent)     98.75%              
Debt Instrument, repurchased face amount     $ 271              
Purchase of U.S. government obligations for the satisfaction and discharge of long-term debt     $ 647              
Gain on extinguishment of debt                 $ 9  
5.25% Notes Due 2026 | Loans payable                    
Debt Instrument [Line Items]                    
Interest rate on debt instruments (percent)           5.25%        
Aggregate principal amount           $ 500        
Proceeds from issuance, net           $ 497        
Redemption price (percent)   100.00%                
2.85% Notes Due March 15, 2023 | Loans payable                    
Debt Instrument [Line Items]                    
Interest rate on debt instruments (percent)         2.85%          
Retired and redeemed outstanding principal amount         $ 360          
2.70% Notes Due December 15, 2022 | Loans payable                    
Debt Instrument [Line Items]                    
Interest rate on debt instruments (percent)             2.70%      
Retired and redeemed outstanding principal amount             $ 400