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Marketable and Other Securities - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Marketable Securities [Abstract]        
Cash and cash equivalents $ 16,349 $ 20,067    
Restricted cash included in Other current assets 3,127      
Restricted cash included in Other assets 503      
Total $ 19,978 $ 23,542 $ 24,876 $ 23,117