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Variable Interest Entities - Additional Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
investment
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
LLCs designed for the purpose of purchasing pools of residual interests in leases      
Variable Interest Entity      
Number of co-investments | investment 3    
Ownership percentage (more than) 50.00%    
Variable Interest Entity, Not Primary Beneficiary | Loans provided to VIEs      
Variable Interest Entity      
Unfunded commitment amounts $ 2,900   $ 2,800
Variable Interest Entity, Not Primary Beneficiary | CDC investments      
Variable Interest Entity      
CDC investments 2,000   2,000
Unfunded commitments in qualifying LIHTC investments $ 720   741
Variable Interest Entity, Not Primary Beneficiary | CDC investments | Minimum      
Variable Interest Entity      
Unfunded commitments, year expected to be funded 2025    
Variable Interest Entity, Not Primary Beneficiary | CDC investments | Maximum      
Variable Interest Entity      
Unfunded commitments, year expected to be funded 2044    
Variable Interest Entity, Not Primary Beneficiary | Private equity investments      
Variable Interest Entity      
Unfunded commitment amounts $ 217   $ 219
Capital contribution to private equity investments $ 17 $ 14