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Financial Instruments - Consolidated Statements of Cash Flows Reconciliation (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]              
Cash and cash equivalents $ 29,930   $ 36,092        
Restricted cash included in accounts receivable, net and other 239   276        
Restricted cash included in other assets 33   42        
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows $ 30,202 $ 37,842 $ 36,410 $ 23,554 $ 22,965 $ 32,173 $ 21,032