v3.26.1
Fair Value Measurements (Fair Value of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value $ 732 $ 1,138
Total liabilities at fair value 71 62
Short-term investments 116 112
Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 52 46
U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 33 12
U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 2 0
Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 5 4
Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 24 50
Quoted Prices In Active Markets For Identical Financial Instruments (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 614 1,010
Total liabilities at fair value 46 36
Significant Other Observable Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 118 128
Total liabilities at fair value 25 26
Fair Value, Inputs, Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 0 0
Total liabilities at fair value 0 0
Cash equivalents | Bank and time deposits | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, cash equivalents 33 58
Cash equivalents | Money market funds | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, cash equivalents 502 904
Cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Bank and time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, cash equivalents 33 58
Cash equivalents | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, cash equivalents 502 904
Cash equivalents | Significant Other Observable Inputs (Level 2) | Bank and time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, cash equivalents 0 0
Cash equivalents | Significant Other Observable Inputs (Level 2) | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, cash equivalents 0 0
Cash equivalents | Fair Value, Inputs, Level 3 | Bank and time deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, cash equivalents 0 0
Cash equivalents | Fair Value, Inputs, Level 3 | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, cash equivalents 0 0
Short-term investments | Corporate bonds | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 52 46
Short-term investments | U.S. Treasury securities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 33 12
Short-term investments | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 2  
Short-term investments | Foreign government securities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments   4
Short-term investments | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 5  
Short-term investments | Asset-backed securities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset-backed securities 24 50
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 33 12
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0  
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Short-term investments | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset-backed securities 0 0
Short-term investments | Significant Other Observable Inputs (Level 2) | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 52 46
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Short-term investments | Significant Other Observable Inputs (Level 2) | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 2  
Short-term investments | Significant Other Observable Inputs (Level 2) | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 5 4
Short-term investments | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset-backed securities 24 50
Short-term investments | Fair Value, Inputs, Level 3 | Corporate bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Short-term investments | Fair Value, Inputs, Level 3 | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Short-term investments | Fair Value, Inputs, Level 3 | U.S. agency securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0  
Short-term investments | Fair Value, Inputs, Level 3 | Foreign government securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Short-term investments | Fair Value, Inputs, Level 3 | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Asset-backed securities 0 0
Other current assets and other assets | Foreign currency derivatives | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives 35 28
Other current assets and other assets | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives 0 0
Other current assets and other assets | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives 35 28
Other current assets and other assets | Fair Value, Inputs, Level 3 | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives 0 0
Other assets | Deferred compensation plan assets | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, deferred compensation plan assets and liabilities 46 36
Other assets | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, deferred compensation plan assets and liabilities 46 36
Other assets | Significant Other Observable Inputs (Level 2) | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, deferred compensation plan assets and liabilities 0 0
Other assets | Fair Value, Inputs, Level 3 | Deferred compensation plan assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, deferred compensation plan assets and liabilities 0 0
Accounts payable, accrued, and other current liabilities and other liabilities | Foreign currency derivatives | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives, liabilities 25 26
Accounts payable, accrued, and other current liabilities and other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives, liabilities   0
Accounts payable, accrued, and other current liabilities and other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives, liabilities 0  
Accounts payable, accrued, and other current liabilities and other liabilities | Significant Other Observable Inputs (Level 2) | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives, liabilities 25 26
Accounts payable, accrued, and other current liabilities and other liabilities | Fair Value, Inputs, Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives, liabilities   0
Accounts payable, accrued, and other current liabilities and other liabilities | Fair Value, Inputs, Level 3 | Foreign currency derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, foreign currency derivatives, liabilities 0  
Other liabilities | Deferred compensation plan liabilities | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, deferred compensation plan assets and liabilities 46 36
Other liabilities | Quoted Prices In Active Markets For Identical Financial Instruments (Level 1) | Deferred compensation plan liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, deferred compensation plan assets and liabilities 46 36
Other liabilities | Significant Other Observable Inputs (Level 2) | Deferred compensation plan liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, deferred compensation plan assets and liabilities 0 0
Other liabilities | Fair Value, Inputs, Level 3 | Deferred compensation plan liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value, deferred compensation plan assets and liabilities $ 0 $ 0