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Cash and Cash Equivalents and Investments in Marketable Securities - Summary of Contractual Maturities of Available-for-Sale Debt Securities (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Available-for-sale debt securities, Amortized Cost  
Due within 1 Year, Amortized Cost $ 177
Due after 1 Year through 5 Years, Amortized Cost 102
Due after 5 Years through 10 Years, Amortized Cost 146
Due after 10 Years, Amortized Cost 77
Mortgage-backed and asset-backed securities, Amortized Cost 127 [1]
Available-for-sale debt securities, Amortized cost 629
Available-for-sale debt securities, Fair Value  
Due within 1 Year, Fair Value 177
Due after 1 Year through 5 Years, Fair Value 102
Due after 5 Years through 10 Years, Fair Value 147
Due after 10 Years, Fair Value 79
Mortgage-backed and asset-backed securities, Fair Value 128 [1]
Total, Fair Value $ 633
[1] Mortgage-backed and asset-backed securities are shown separately from other maturity groupings as these securities have multiple maturity dates.