Valuation of Debt and Equity Investments and Certain Liabilities - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Credit losses related to available-for-sale investments	$ 0	$ 0	$ 0
Proceeds from sales, redemptions and maturities of short-term available-for-sale securities	8,480,000,000	5,290,000,000	$ 2,310,000,000
Proceeds from sale of short-term investments		253,000,000
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets fair value	0	0
Total liabilities fair value	$ 0	$ 0