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Distributions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 21, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Distributions [Line Items]            
Distributions (in USD per share)   $ 2.66 $ 2.47 $ 2.56 $ 3.04 $ 3.40
Percent of market price   95.00%        
Tax-basis net investment income   $ 861 $ 557 $ 357    
Undistributed net investment income   446 284 244    
Accumulated capital losses on a tax basis   (2,036) (1,705) $ (855)    
Income tax purposes   17,159 17,167      
Net unrealized appreciation (depreciation)   (1,782) (1,066)      
Subsequent Event            
Schedule of Distributions [Line Items]            
Distributions (in USD per share) $ 0.70          
Additional Paid-in Capital            
Schedule of Distributions [Line Items]            
Adjustments to classification of stockholders equity as a result of permanent book-to-tax differences   8 (2,162)      
Retained Earnings | Net Investment Income            
Schedule of Distributions [Line Items]            
Adjustments to classification of stockholders equity as a result of permanent book-to-tax differences   (47) 47      
Retained Earnings | Realized Gain (Loss) on Investments and Gain (Loss) on Foreign Currency            
Schedule of Distributions [Line Items]            
Adjustments to classification of stockholders equity as a result of permanent book-to-tax differences   55 $ 2,115      
Subsidiaries            
Schedule of Distributions [Line Items]            
Deferred tax liability   10        
Deferred tax asset   57        
Deferred tax asset offset by valuation allowance   50        
Deferred income tax   3        
Current income tax   $ 2