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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Feb. 28, 2023
Aug. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Amount $ 2,900 $ 2,875
Senior Notes | 4.900% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 4.90%  
Carrying Amount $ 300 300
Senior Notes | 3.950% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 3.95%  
Carrying Amount $ 497 497
Senior Notes | 3.600% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 3.60%  
Carrying Amount $ 496 496
Senior Notes | 3.000% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 3.00%  
Carrying Amount $ 593 592
Senior Notes | 1.700% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 1.70%  
Carrying Amount $ 497 497
Senior Notes | 4.250% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 4.25%  
Carrying Amount $ 494 493
Senior Notes | Carrying Amount | Level 3 | 4.900% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Amount 300 300
Senior Notes | Carrying Amount | Level 2 | 3.950% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Amount 497 497
Senior Notes | Carrying Amount | Level 2 | 3.600% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Amount 496 496
Senior Notes | Carrying Amount | Level 2 | 3.000% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Amount 593 592
Senior Notes | Carrying Amount | Level 2 | 1.700% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Amount 497 497
Senior Notes | Carrying Amount | Level 2 | 4.250% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying Amount 494 493
Senior Notes | Fair Value | Level 3 | 4.900% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 299 300
Senior Notes | Fair Value | Level 2 | 3.950% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 463 471
Senior Notes | Fair Value | Level 2 | 3.600% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 439 440
Senior Notes | Fair Value | Level 2 | 3.000% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 492 500
Senior Notes | Fair Value | Level 2 | 1.700% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value 446 446
Senior Notes | Fair Value | Level 2 | 4.250% Senior Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value $ 475 $ 483