Valuation of debt and equity investments and certain liabilities - Investments at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	$ 3,439	$ 3,050
Short-Term Investments	6,113	6,017
Long-Term Investments	31	34
Measured at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	2,901	2,343
Short-Term Investments	6,113	6,017
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	2,367	1,238
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	384	276
Short-Term Investments	1,761	1,535
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	100	680
Short-Term Investments	3,957	4,234
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	50	149
Short-Term Investments	395	248
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 | 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	14	18
Other measurement basis | Non-marketable 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	6	5
Other measurement basis | Cash on hand
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents	538	707
Short-Term Investments	0	0
Long-Term Investments	$ 0	$ 0