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Marketable and Other Securities - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Marketable Securities [Abstract]        
Cash and cash equivalents $ 28,228 $ 19,069    
Restricted cash included in Other current assets 3,930      
Restricted cash included in Other assets 482      
Total $ 32,640 $ 22,943 $ 20,181 $ 23,496