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Fair value measurement of assets and liabilities - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) $ / item	Dec. 31, 2022 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of financial liabilities measured at fair value less than	$ 1
Recognized gains in interest income and other financial gains	41	$ 29
Maximum gross realized gains		1
Unobservable inputs (Level 3) | Loans receivable, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	1,954	1,761
Corporate debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Proceeds from sale of available for sale securitites		156
Auction Rate Securities | Direct Investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	361	359
Auction Rate Securities | Significant other observable inputs (Level 2) | Direct Investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments	550	541
Convertible Senior Notes | 2028 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value	$ 1,329	$ 884
Closing trading price per share | $ / item	100

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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