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Marketable and Other Securities - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Marketable Securities [Abstract]        
Cash and cash equivalents $ 19,069 $ 20,844    
Restricted cash included in Other current assets 3,352 2,083    
Restricted cash included in Other assets 522 569    
Total $ 22,943 $ 23,496 $ 17,848 $ 15,160