Loans and Allowance for Credit Losses - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) loan_segment loan	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) loan
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans and leases segments | loan_segment	2
Loans pledged as collateral	$ 49,022		$ 46,589
Number of loans on non-accrual status | loan	3		4
Nonaccrual loan value	$ 216		$ 258
Allowance for credit losses on loans	$ 168		$ 193
Investment grade loans	92.00%
Speculative grade loans	7.00%
Speculative senior secured loans with BB or B rating	84.00%
Provision for credit losses	$ 16	$ 12
Collateralized loan obligations
Financing Receivable, Credit Quality Indicator [Line Items]
Purchase of collateralized loan obligations	1,640
Broadly syndicated
Financing Receivable, Credit Quality Indicator [Line Items]
Purchase of collateralized loan obligations	1,230
Middle market
Financing Receivable, Credit Quality Indicator [Line Items]
Purchase of collateralized loan obligations	410
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable for sale	156
Charge-offs	$ 40
Commercial and Financial
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans no longer meeting similar risk of collective pool | loan	2
Loans no longer meeting similar risk of collective pool	$ 29
Allowance for credit losses on loans	$ 95
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans no longer meeting similar risk of collective pool | loan	4
Loans no longer meeting similar risk of collective pool	$ 295
More than 90 days contractually past due
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans on non-accrual status | loan	0		0
Asset pledged as collateral
Financing Receivable, Credit Quality Indicator [Line Items]
Loans pledged as collateral	$ 16,880		$ 15,110