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Marketable and Other Securities - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Marketable Securities [Abstract]        
Cash and cash equivalents $ 20,067 $ 19,992    
Restricted cash included in Other current assets 2,935 2,581    
Restricted cash included in Other assets 540 544    
Total $ 23,542 $ 23,117 $ 22,943 $ 23,496