XML 96 R60.htm IDEA: XBRL DOCUMENT v3.23.3
Fair Value Measurements and Investments - Continuous Unrealized Losses for Less than 12 Months and More than 12 Months (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 1,772 $ 3,915
Less Than 12 Months, Gross Unrealized Losses (14) (134)
12 Months or Greater, Fair Value 2,178  
12 Months or Greater, Gross Unrealized Losses (68)  
U.S. government-sponsored debt securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 412 408
Less Than 12 Months, Gross Unrealized Losses (2) (1)
12 Months or Greater, Fair Value 50  
12 Months or Greater, Gross Unrealized Losses 0  
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 1,360 3,507
Less Than 12 Months, Gross Unrealized Losses (12) $ (133)
12 Months or Greater, Fair Value 2,128  
12 Months or Greater, Gross Unrealized Losses $ (68)