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Financial Instruments - Carrying Values for Marketable and Non-marketable Equity Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Marketable Equity Securities    
Total initial cost $ 5,331 $ 5,764
Cumulative net gain (loss) (358) (608)
Carrying value 4,973 5,156
Non-Marketable Equity Securities    
Total initial cost 17,504 16,157
Cumulative net gain (loss) 11,317 12,372
Carrying value 28,821 28,529
Total    
Total initial cost 22,835 21,921
Cumulative net gain (loss) 10,959 11,764
Carrying value 33,794 33,685
Cumulative net gain of non-marketable securities 18,000 16,800
Unrealized loss of non-marketable securities $ 6,700 $ 4,500