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Variable Interest Entities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]          
Aggregate assets $ 465,255   $ 465,255   $ 479,843
Aggregate liabilities 415,871   415,871   431,468
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Amortization 48 $ 37 142 $ 117  
Tax credits and other tax benefits 62 $ 48 188 $ 150  
Aggregate assets 2,280   2,280   1,953
Aggregate liabilities 1,109   1,109   947
Maximum exposure to loss 2,373   2,373   2,069
Variable Interest Entity, Not Primary Beneficiary | LIHTC Investments          
Variable Interest Entity [Line Items]          
Aggregate assets 2,032   2,032   1,729
Aggregate liabilities 1,109   1,109   947
Maximum exposure to loss 2,032   2,032   1,729
Variable Interest Entity, Not Primary Beneficiary | Other investments          
Variable Interest Entity [Line Items]          
Aggregate assets 248   248   224
Aggregate liabilities 0   0   0
Maximum exposure to loss $ 341   $ 341   $ 340