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Debt and Financing Activities - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Debt Instrument [Line Items]    
Total debt $ 9,729 $ 6,526
Less: Current portion 1,297 1,267
Total long-term debt $ 8,432 5,259
Loans payable | 1.30% Notes due August 15, 2026    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 1.30%  
Total debt $ 500 500
Loans payable | 7.65% Debentures due March 1, 2027    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 7.65%  
Total debt $ 150 150
Loans payable | 3.95% Notes due February 16, 2028    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 3.95%  
Total debt $ 343 343
Loans payable | 4.90% Notes due July 15, 2028    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 4.90%  
Total debt $ 400 400
Loans payable | 4.75% Notes due May 30, 2029    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 4.75%  
Total debt $ 196 196
Loans payable | 4.25% Notes due September 15, 2029    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 4.25%  
Total debt $ 500 500
Loans payable | 4.65% Notes due May 30, 2030    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 4.65%  
Total debt $ 650 650
Loans payable | 4.95% Notes due May 30, 2032    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 4.95%  
Total debt $ 650 650
Loans payable | 5.10% Notes due July 15, 2033    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 5.10%  
Total debt $ 597 597
Loans payable | 5.25% Notes due May 30, 2035    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 5.25%  
Total debt $ 699 699
Loans payable | 6.00% Notes due March 1, 2041    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 6.00%  
Total debt $ 218 218
Loans payable | 4.88% Notes due March 15, 2044    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 4.88%  
Total debt $ 255 255
Loans payable | 5.88 Term Loan B Due June 9, 2032    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 5.88%  
Loans payable | 1.63% Euro Notes due October 30, 2026    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 1.63%  
Total debt $ 571 578
Loans payable | 3.13% Sterling Notes due February 17, 2029    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 3.13%  
Total debt $ 597 595
Line of Credit | 4.94 Term Loan A-2 Due April 3, 2028 | Revolving Credit Facility    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 4.94%  
Total debt $ 250 0
Line of Credit | 4.94 Term Loan A-1 Due April 1, 2031 | Revolving Credit Facility    
Debt Instrument [Line Items]    
Interest rate on debt instrument (as a percent) 4.94%  
Total debt $ 750 0
Line of Credit | 5.88 Term Loan B Due June 9, 2032 | Revolving Credit Facility    
Debt Instrument [Line Items]    
Total debt 2,239 0
Lease and other obligations    
Debt Instrument [Line Items]    
Total debt $ 164 $ 195