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Cash and Cash Equivalents and Investments in Marketable Securities - Summary of Contractual Maturities of Available-for-Sale Debt Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Available-for-sale debt securities, Amortized cost    
Due within 1 Year, Amortized cost $ 878  
Due after 1 Year through 5 Years, Amortized cost 128  
Due after 5 Years through 10 Years, Amortized cost 115  
Due after 10 Years, Amortized cost 90  
Mortgage-backed and asset-backed securities, Amortized cost [1] 170  
Available-for-sale debt securities, Amortized cost 1,381 $ 629
Available-for-sale debt securities, Fair value    
Due within 1 Year, Fair value 874  
Due after 1 Year through 5 Years, Fair value 132  
Due after 5 Years through 10 Years, Fair value 123  
Due after 10 Years, Fair value 105  
Mortgage-backed and asset-backed securities, Fair value [1] 167  
Total, Fair value $ 1,401 $ 633
[1] Mortgage-backed and asset-backed securities are shown separately from other maturity groupings as these securities have multiple maturity dates.