Accounting Policies and Supplemental Disclosures - Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounting Policies [Abstract]
Marketable equity securities valuation gains (losses)	$ 157	$ 235	$ 81	$ 204
Equity warrant valuation gains (losses)	939	418	1,244	266
Upward adjustments relating to equity investments in private companies	31	0	1,506	0
Foreign currency gains (losses)	110	13	79	(209)
Other, net	24	(20)	48	(21)
Total other income (expense), net	$ 1,261	$ 646	$ 2,958	$ 240