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Disclosure - Investments - Fair Value, Assets Measured on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Investments - Schedules of Portfolio Composition by Geographic Region at Amortization Cost and Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Investments - Schedule of Portfolio Composition by Industry at Amortization Cost and Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Derivatives - Open Forward Foreign Currency Contract (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Derivatives - Open Forward Foreign Currency Contract (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Derivatives - Schedule of Realized and Unrealized Gain (Loss) on Forward Currency Contract (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Derivatives - Summary of Average Outstanding Daily Volume for Forward Currency Contract (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Derivatives - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Derivatives - Schedule of Derivatives Designated in a Qualifying Hedge Accounting Relationship (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Derivatives - Schedule of Interest Rate Swap Derivative Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Derivatives - Schedule of Interest Rate Swap Derivative Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Derivatives - Schedule of Designated in Qualifying Hedging Relationship (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Derivatives - Schedule of Forward Currency Contract, Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Fair Value Measurements - Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Fair Value Measurements - Fair Value Measurement Inputs and Valuation Techniques (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Borrowings - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Borrowings - 2024 Debt Securitization (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Borrowings - Schedule of Debt Securitization (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Borrowings - Schedule of Interest Rate and Interest Differential Analysis (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Borrowings - 2018 Debt Securitization (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Borrowings - GCIC 2018 Debt Securitization (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Borrowings - GBDC 3 2021 Debt Securitization (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Borrowings - GBDC 3 2022 Debt Securitization (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Borrowings - GBDC 3 2022-2 Debt Securitization (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Borrowings - GBDC 3 DB Credit Facility (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Borrowings - JPM Credit Facility (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Borrowings - 2024 Notes (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Borrowings - 2026 Notes (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Borrowings - 2027 Notes (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Borrowings - 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Disclosure - Dividends and Distributions (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink