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Available-for-Sale Debt Securities - Summary of the Balance Sheet Classification of Available-for-Sale Debt Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Available-for-Sale Debt Securities    
Available-for-sale debt securities $ 14,935 $ 16,500
Cash and cash equivalents    
Available-for-Sale Debt Securities    
Available-for-sale debt securities 491 2,291
Short-term marketable securities    
Available-for-Sale Debt Securities    
Available-for-sale debt securities 12,168 12,721
Long-term marketable securities    
Available-for-Sale Debt Securities    
Available-for-sale debt securities $ 2,276 $ 1,488