Valuation of Debt and Equity Investments and Certain Liabilities - Investments at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 3,200	$ 2,964
Short-term investments	4,380	5,611
Long-Term Investments	23	34
Measured at fair value:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	2,457	2,163
Short-term investments	4,380	5,611
Long-Term Investments	11	12
Measured at fair value: | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	762	1,068
Short-term investments	0	0
Long-Term Investments	0	0
Measured at fair value: | Corporate obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	694	349
Short-term investments	796	1,605
Long-Term Investments	0	0
Measured at fair value: | U.S. government and agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	752	696
Short-term investments	3,485	3,808
Long-Term Investments	0	0
Measured at fair value: | Non-U.S. government and agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	249	50
Short-term investments	99	198
Long-Term Investments	0	0
Measured at fair value: | Mutual funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	0	0
Short-term investments	0	0
Long-Term Investments	11	12
Other measurement basis:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	0	0
Short-term investments	0	0
Long-Term Investments	12	22
Other measurement basis: | Equity-method investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	0	0
Short-term investments	0	0
Long-Term Investments	8	17
Other measurement basis: | Nonmarketable investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	0	0
Short-term investments	0	0
Long-Term Investments	4	5
Other measurement basis: | Cash on hand
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	743	801
Short-term investments	0	0
Long-Term Investments	$ 0	$ 0