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Distributions - Cash Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Investment Company [Abstract]      
Distributions (in USD per share) $ 0.75 $ 0.70 $ 2.95
Distribution, amount [1] $ 210 $ 196  
[1] See Note 5 for a discussion of the sources of distributions paid by the Company.