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Variable Interest Entities and Asset Securitizations - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Loss on securitization of assets       $ 0    
Other assets for its "investment" in the common securities recognized by the company of various trusts   $ 22,000,000   22,000,000   $ 22,000,000
Total assets of partnerships in which the company invested   209,124,316,000   209,124,316,000   200,729,841,000
Investment in partnership carrying amount   1,400,000,000   1,400,000,000   1,500,000,000
Unfunded commitments includes carrrying amount of its investments   491,000,000   491,000,000   545,000,000
Contingent Commitments to Provide Additional Capital Contributions to Partnerships   49,000,000   49,000,000    
Maximum exposure to loss of investments in real estate partnerships   2,100,000,000   2,100,000,000    
Investments amortized to income tax expense   46,000,000 $ 37,000,000 128,000,000 $ 94,000,000  
Federal tax credits and other federal tax benefits recognized   52,000,000 $ 44,000,000 147,000,000 $ 108,000,000  
Remaining balance of loans and leases   133,133,497,000   133,133,497,000   132,074,156,000
Loans and leases   130,302,558,000   130,302,558,000   129,638,832,000
Asset-backed notes   516,668,000   516,668,000    
Senior notes   3,741,161,000   3,741,161,000   1,249,141,000
Asset-backed Notes [Member]            
Remaining balance of loans and leases   643,000,000   643,000,000    
Loans and leases $ 666,000,000          
Asset-backed notes $ 88,000,000 517,000,000   517,000,000    
Loans and leases average rate 5.84%          
Senior notes $ 550,000,000          
Asset-backed notes weighed average estimated life 2 years          
Variable Interest Entity Primary Beneficiary [Member]            
Total assets of partnerships in which the company invested   $ 9,800,000,000   $ 9,800,000,000   $ 9,200,000,000