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Income taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Line Items]      
Income (loss) before income taxes and income of investments accounted for under the equity method $ 3,272,186 $ (1,002,420) $ 1,147,917
Net deferred income tax liabilities 2,250,364 1,983,764  
Deferred tax assets 275,756 210,334  
Deferred tax liabilities 2,526,120 2,194,098  
Valuation allowance, deferred tax asset, increase (decrease), amount 49,000 32,000  
Valuation allowance on tax assets 70,812 119,961 $ 11,000
Unrecognized tax benefits $ 17,000 $ 32,000  
Local statutory tax rate 12.50% 12.50% 12.50%
Valuation allowance, deferred tax asset, decrease, amount     $ 1,000
Valuation allowance, deferred tax asset, increase, amount     12,000
GECAS      
Income Tax Disclosure [Line Items]      
Valuation allowance acquired     61,000
Ireland      
Income Tax Disclosure [Line Items]      
Income (loss) before income taxes and income of investments accounted for under the equity method $ 3,200,000 $ (1,100,000) 1,100,000
Net deferred income tax liabilities 2,317,069 2,032,624  
Valuation allowance on tax assets $ 17,242 16,285  
Local statutory tax rate 12.50%    
Operating loss carryforwards $ 12,000    
Valuation allowance, recognized 5,000    
Ireland | No expiration date      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards 15,800,000    
Other      
Income Tax Disclosure [Line Items]      
Income (loss) before income taxes and income of investments accounted for under the equity method 100,000 100,000 $ 100,000
Valuation allowance on tax assets 53,570 $ 103,676  
Other | Internal Revenue Service (IRS)      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards 325,000    
Other | No expiration date | Internal Revenue Service (IRS)      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards 192,000    
Other | Expires Between 2028 and 2038 | Internal Revenue Service (IRS)      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards 133,000    
Other | Subject To Annual Limitation | Internal Revenue Service (IRS)      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards 52,000    
State and Local Jurisdiction | Expires Between 2035 and 2042 | Internal Revenue Service (IRS)      
Income Tax Disclosure [Line Items]      
Operating loss carryforwards $ 4,000