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Commitments and Contingencies - Summary (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Investments in affordable housing projects    
Tax Credit and Certain Equity Investments    
Carrying amount $ 7,164 $ 6,754
Amount of future funding commitments included in carrying amount 2,509 2,473
Lending exposure 2,183 1,981
Renewable Energy Investments    
Tax Credit and Certain Equity Investments    
Carrying amount 496 285
Amount of future funding commitments not included in carrying amount 562 747
SBIC and certain other equity method investments:    
Tax Credit and Certain Equity Investments    
Carrying amount 796 758
Amount of future funding commitments not included in carrying amount $ 567 $ 589