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Investments in Marketable Securities - Summary of Contractual Maturities of AFS Debt Securities (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Available-for-sale debt securities, Amortized Cost  
Due within 1 Year, Amortized Cost $ 264
Due after 1 Year through 5 Years, Amortized Cost 96
Due after 5 Years through 10 Years, Amortized Cost 156
Due after 10 Years, Amortized Cost 71
Mortgage-backed and asset-backed securities, Amortized Cost 125 [1]
Available-for-sale debt securities, Amortized cost 712
Available-for-sale debt securities, Fair Value  
Due within 1 Year, Fair Value 264
Due after 1 Year through 5 Years, Fair Value 95
Due after 5 Years through 10 Years, Fair Value 152
Due after 10 Years, Fair Value 68
Mortgage-backed and asset-backed securities, Fair Value 125 [1]
Total, Fair Value $ 704
[1] Mortgage-backed and asset-backed securities are shown separately from other maturity groupings as these securities have multiple maturity dates.