Valuation of Debt and Equity Investments and Certain Liabilities - Investments at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 3,225	$ 3,200
Short-term investments	1,656	4,380
Long-Term Investments	16	23
Measured at fair value:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	2,841	2,457
Short-term investments	1,656	4,380
Long-Term Investments	11	11
Measured at fair value: \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	844	762
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	517	694
Short-term investments	522	796
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	1,296	752
Short-term investments	1,035	3,485
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	184	249
Short-term investments	99	99
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	11
Other measurement basis \| Other 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	5	12
Other measurement basis \| Cash on hand
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	384	743
Short-term investments	0	0
Long-Term Investments	$ 0	$ 0

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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