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Fair Value Measurements - Carrying and Estimated Fair Value of Debt (Details) - USD ($)
$ in Millions
Apr. 20, 2025
Mar. 31, 2024
May 01, 2020
Unsecured Debt | 5.25% Notes due 2025      
Debt Instrument [Line Items]      
Carrying value   $ 1,302  
Unsecured Debt | 3.00% Notes due 2026      
Debt Instrument [Line Items]      
Carrying value   300  
Unsecured Debt | 7.375% Debentures due 2027      
Debt Instrument [Line Items]      
Carrying value   110  
Unsecured Debt | 3.45% Notes due 2027      
Debt Instrument [Line Items]      
Carrying value   300  
Unsecured Debt | 5.125% Notes due 2027      
Debt Instrument [Line Items]      
Carrying value   1,727  
Unsecured Debt | 2.625% due 2030      
Debt Instrument [Line Items]      
Carrying value   500  
Unsecured Debt | 1.000% Payroll Support Program Loan due 2030      
Debt Instrument [Line Items]      
Carrying value   976  
Unsecured Debt | 1.000% Payroll Support Program Loan due 2030 | Forecast | Secured Overnight Financing Rate      
Debt Instrument [Line Items]      
Variable rate (as a percent) 2.00%    
Unsecured Debt | 1.000% Payroll Support Program Loan due 2031      
Debt Instrument [Line Items]      
Carrying value   566  
Unsecured Debt | 1.000% Payroll Support Program Loan due 2031 | Forecast | Secured Overnight Financing Rate      
Debt Instrument [Line Items]      
Variable rate (as a percent) 2.00%    
Unsecured Debt | 1.000% Payroll Support Program Loan Due 2031      
Debt Instrument [Line Items]      
Carrying value   526  
Unsecured Debt | 1.000% Payroll Support Program Loan Due 2031 | Forecast | Secured Overnight Financing Rate      
Debt Instrument [Line Items]      
Variable rate (as a percent) 2.00%    
Convertible Debt | 1.25% Convertible Notes due 2025      
Debt Instrument [Line Items]      
Carrying value   $ 1,611  
Level 2 | Unsecured Debt | 5.25% Notes due 2025      
Debt Instrument [Line Items]      
Stated interest rate   5.25%  
Notes payable, Estimated Fair Value   $ 1,298  
Level 2 | Unsecured Debt | 3.00% Notes due 2026      
Debt Instrument [Line Items]      
Stated interest rate   3.00%  
Notes payable, Estimated Fair Value   $ 283  
Level 2 | Unsecured Debt | 7.375% Debentures due 2027      
Debt Instrument [Line Items]      
Stated interest rate   7.375%  
Loans payable, Estimated Fair Value   $ 114  
Level 2 | Unsecured Debt | 3.45% Notes due 2027      
Debt Instrument [Line Items]      
Stated interest rate   3.45%  
Notes payable, Estimated Fair Value   $ 283  
Level 2 | Unsecured Debt | 5.125% Notes due 2027      
Debt Instrument [Line Items]      
Stated interest rate   5.125%  
Notes payable, Estimated Fair Value   $ 1,725  
Level 2 | Unsecured Debt | 2.625% due 2030      
Debt Instrument [Line Items]      
Stated interest rate   2.625%  
Notes payable, Estimated Fair Value   $ 435  
Level 2 | Convertible Debt | 1.25% Convertible Notes due 2025      
Debt Instrument [Line Items]      
Stated interest rate   1.25% 1.25%
Notes payable, Estimated Fair Value   $ 1,630  
Level 3 | Unsecured Debt | 1.000% Payroll Support Program Loan due 2030      
Debt Instrument [Line Items]      
Stated interest rate   1.00%  
Notes payable, Estimated Fair Value   $ 953  
Level 3 | Unsecured Debt | 1.000% Payroll Support Program Loan due 2031      
Debt Instrument [Line Items]      
Stated interest rate   1.00%  
Notes payable, Estimated Fair Value   $ 532  
Level 3 | Unsecured Debt | 1.000% Payroll Support Program Loan Due 2031      
Debt Instrument [Line Items]      
Stated interest rate   1.00%  
Notes payable, Estimated Fair Value   $ 489