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Fair value measurement of assets and liabilities - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
$ / item
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Recognized gains in interest income and other financial gains $ 64 $ 39 $ 121 $ 62  
Maximum gross realized gains         $ 1
Unobservable inputs (Level 3) | Loans receivable, net          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Assets 2,176   2,176   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 365   365   359
Auction Rate Securities | Significant other observable inputs (Level 2) | Direct Investment          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Investments 559   559   541
Convertible Senior Notes | 2028 Notes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated fair value $ 1,202   $ 1,202   $ 884
Closing trading price per share (in dollars per share) | $ / item     100