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Investment Debt Securities Contractual maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Available-for-sale, Amortized Cost Basis    
Due in one year or less $ 4 $ 3
Due after one year through five years 1,121 1,084
Due after five years through ten years 445 301
Due after ten years 839 761
MBS and FFELP ABS 21,802 21,133
Amortized Cost Basis 24,211 23,282
Available-for-sale, Net Carrying Amount and Fair Value    
Due in one year or less 4 3
Due after one year through five years 1,115 1,078
Due after five years through ten years 420 275
Due after ten years 747 677
MBS and FFELP ABS 21,968 21,051
Net Carrying Amount and Fair Value 24,254 23,084
Held-to-maturity, Amortized Cost and Net Carrying Amount    
Due in one year or less 830 1,180
Due after one year through five years 57 56
Due after five years through ten years 136 149
Due after ten years 3 0
MBS and FFELP ABS 145 167
Amortized Cost and Net Carrying Amount 1,171 1,552
Held-to-maturity, Fair Value    
Due in one year or less 832 1,181
Due after one year through five years 55 55
Due after five years through ten years 128 142
Due after ten years 3 0
MBS and FFELP ABS 145 169
Fair Value $ 1,163 $ 1,547