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Financial Instruments (Non-Marketable Equity Securities) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value Disclosures [Abstract]        
Unrealized gains $ 1,225 $ 398 $ 1,770 $ 1,816
Unrealized losses (including impairment) (27) (232) (1,413) (370)
Total unrealized gain (loss) for non-marketable equity securities $ 1,198 $ 166 $ 357 $ 1,446