Financial Instruments - Information on Available-for-sale Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	$ 247		$ 247		$ 569
Debt securities, unrealized gains	0		0		0
Debt securities, unrealized losses	0		0		0
Debt securities, fair value	247		247		569
Publicly traded equity securities, fair value	1,746		1,746		1,284
Total debt and publicly traded equity securities, fair value	1,993		1,993		1,853
Unrealized net gains (losses)	61	$ (221)	327	$ (415)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	168		168		498
Debt securities, unrealized gains	0		0		0
Debt securities, unrealized losses	0		0		0
Debt securities, fair value	168		168		498
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	67		67		68
Debt securities, unrealized gains	0		0		0
Debt securities, unrealized losses	0		0		0
Debt securities, fair value	67		67		68
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	12		12		3
Debt securities, unrealized gains	0		0		0
Debt securities, unrealized losses	0		0		0
Debt securities, fair value	$ 12		$ 12		$ 3