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Investment Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Due within one year $ 283
Due from one to five years 795
Due from five to ten years 1,738
Due after ten years 4,966
Debt securities, available-for-sale, amortized cost, total 7,782
Agency - commercial  
Debt Securities, Available-for-sale [Line Items]  
Due within one year 20
Due from one to five years 175
Due from five to ten years 322
Due after ten years 4,971
Debt securities, available-for-sale, amortized cost, total 5,488
U.S. Government agency and GSE obligations  
Debt Securities, Available-for-sale [Line Items]  
Due within one year 247
Due from one to five years 200
Due from five to ten years 1,377
Due after ten years 150
Debt securities, available-for-sale, amortized cost, total 1,974
US States and Political Subdivisions Debt Securities  
Debt Securities, Available-for-sale [Line Items]  
Due within one year 0
Due from one to five years 0
Due from five to ten years 7
Due after ten years 0
Debt securities, available-for-sale, amortized cost, total 7
Other Debt Obligations  
Debt Securities, Available-for-sale [Line Items]  
Due within one year 20
Due from one to five years 432
Due from five to ten years 409
Due after ten years 367
Debt securities, available-for-sale, amortized cost, total $ 1,228