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AGREEMENTS - Schedule of Base Management Fees, Income Based Fees, and Capital Gains Incentive Fees (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Investment Company [Abstract]
Base management fees	$ 79	$ 73
Income based fees	76	51
Capital gains incentive fees	$ (6)	$ 2

X

- Definition

Incentive Fee Expense (Reversal)

+ References

No definition available.

+ Details

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X

- Definition

Income Based Fees

+ References

No definition available.

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Namespace Prefix:	arcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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