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Repurchase Agreements and Reverse Repurchase Agreements (Tables)
 9 Months Ended
Sep. 30, 2024
Disclosure of Repurchase Agreements [Abstract]  
Schedule of Borrowings under Repurchase Agreements and Weighted Average Interest Rates The following table summarizes our borrowings under repurchase agreements by their remaining maturities as of September 30, 2024 and December 31, 2023 (dollars in millions):
 September 30, 2024December 31, 2023
Remaining MaturityRepurchase AgreementsWeighted
Average
Interest
Rate		Weighted
Average Days
to Maturity		Repurchase AgreementsWeighted
Average
Interest
Rate		Weighted
Average Days
to Maturity
Investment securities repo
≤ 1 month$53,118 5.26 %8 $40,946 5.61 %11 
> 1 to ≤ 3 months9,904 5.08 %51 7,933 5.55 %64 
> 3 to ≤ 6 months377 4.86 %95 — — %— 
Investment securities repo63,399 5.23 %15 48,879 5.60 %19 
U.S. Treasury repo:
≤ 1 month2,580 5.06 %1 1,547 5.54 %2 
Total$65,979 5.22 %14 $50,426 5.60 %19