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Fair value measurement of assets and liabilities - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
$ / item
Sep. 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 $ 81 $ 42 $ 195 $ 104  
Maximum gross realized gains         $ 1
Equity securities at fair value          
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 553   553   541
Convertible Senior Notes | 2028 Notes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Estimated fair value $ 255   $ 255   $ 884
Closing trading price per share (in dollars per share) | $ / item     100    
Common stock, closing price per share (in dollars per share) | $ / shares $ 1,267.88   $ 1,267.88    
Debt instrument convertible, if-converted in excess of principal $ 167   $ 167