v3.25.2
Securities - Distribution of Maturities of Debt Securities with Approximate Yield of Portfolio (Detail)
$ in Millions
Jun. 30, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 2,922
Available-for-sale yield within one year (percent) 1.34%
Available-for-sale amount after one but within five years $ 9,569
Available-for-sale yield after one but within five years (percent) 3.68%
Available-for-sale amount after five but within ten years $ 3,038
Available-for-sale yield after five but within ten years (percent) 4.16%
Available-for-sale amount after ten years $ 15,517
Available-for-sale yield after ten years (percent) 2.83%
Total fair value within one year $ 2,917
Total fair value after one but within five years 9,542
Total fair value after five but within ten years 3,030
Total fair value after ten years 13,550
Held-to-maturity amount within one year $ 0
Held-to-maturity yield within one year (percent) 0.00%
Held-to-maturity amount after one but within five years $ 2,671
Held-to-maturity yield after one but within five years (percent) 3.59%
Held-to-maturity after five but within ten years $ 953
Held-to-maturity yield after five but within ten years (percent) 3.74%
Held-to-maturity after ten years $ 14,923
Held-to-maturity yield after ten years (percent) 4.65%
Total fair value within one year $ 0
Total fair value after one but within five years 2,656
Total fair value after five but within ten years 918
Total fair value after ten years 14,545
U.S. Treasury  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 868
Available-for-sale yield within one year (percent) 1.24%
Available-for-sale amount after one but within five years $ 7,404
Available-for-sale yield after one but within five years (percent) 3.68%
Available-for-sale amount after five but within ten years $ 2,622
Available-for-sale yield after five but within ten years (percent) 4.15%
Available-for-sale amount after ten years $ 2,393
Available-for-sale yield after ten years (percent) 2.96%
Held-to-maturity amount within one year $ 0
Held-to-maturity yield within one year (percent) 0.00%
Held-to-maturity amount after one but within five years $ 2,460
Held-to-maturity yield after one but within five years (percent) 3.65%
Held-to-maturity after five but within ten years $ 366
Held-to-maturity yield after five but within ten years (percent) 3.73%
Held-to-maturity after ten years $ 0
Held-to-maturity yield after ten years (percent) 0.00%
U.S. Government sponsored enterprises  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 48
Available-for-sale yield within one year (percent) 1.65%
Available-for-sale amount after one but within five years $ 506
Available-for-sale yield after one but within five years (percent) 1.82%
Available-for-sale amount after five but within ten years $ 1
Available-for-sale yield after five but within ten years (percent) 3.79%
Available-for-sale amount after ten years $ 4,414
Available-for-sale yield after ten years (percent) 1.91%
Held-to-maturity amount within one year $ 0
Held-to-maturity yield within one year (percent) 0.00%
Held-to-maturity amount after one but within five years $ 209
Held-to-maturity yield after one but within five years (percent) 2.82%
Held-to-maturity after five but within ten years $ 577
Held-to-maturity yield after five but within ten years (percent) 3.71%
Held-to-maturity after ten years $ 328
Held-to-maturity yield after ten years (percent) 2.89%
U.S. Government agency issued or guaranteed  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 0
Available-for-sale yield within one year (percent) 0.00%
Available-for-sale amount after one but within five years $ 0
Available-for-sale yield after one but within five years (percent) 0.00%
Available-for-sale amount after five but within ten years $ 2
Available-for-sale yield after five but within ten years (percent) 3.93%
Available-for-sale amount after ten years $ 8,571
Available-for-sale yield after ten years (percent) 3.23%
Held-to-maturity amount within one year $ 0
Held-to-maturity yield within one year (percent) 0.00%
Held-to-maturity amount after one but within five years $ 0
Held-to-maturity yield after one but within five years (percent) 0.00%
Held-to-maturity after five but within ten years $ 10
Held-to-maturity yield after five but within ten years (percent) 5.65%
Held-to-maturity after ten years $ 14,595
Held-to-maturity yield after ten years (percent) 4.69%
Obligations of U.S. states and political subdivisions  
Debt Securities, Available-for-sale [Line Items]  
Held-to-maturity amount within one year $ 0
Held-to-maturity yield within one year (percent) 0.00%
Held-to-maturity amount after one but within five years $ 2
Held-to-maturity yield after one but within five years (percent) 3.80%
Held-to-maturity after five but within ten years $ 0
Held-to-maturity yield after five but within ten years (percent) 0.00%
Held-to-maturity after ten years $ 0
Held-to-maturity yield after ten years (percent) 0.00%
Asset-backed securities  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 0
Available-for-sale yield within one year (percent) 0.00%
Available-for-sale amount after one but within five years $ 45
Available-for-sale yield after one but within five years (percent) 4.41%
Available-for-sale amount after five but within ten years $ 47
Available-for-sale yield after five but within ten years (percent) 3.88%
Available-for-sale amount after ten years $ 139
Available-for-sale yield after ten years (percent) 5.45%
Foreign debt securities  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 2,006
Available-for-sale yield within one year (percent) 1.38%
Available-for-sale amount after one but within five years $ 1,614
Available-for-sale yield after one but within five years (percent) 4.27%
Available-for-sale amount after five but within ten years $ 366
Available-for-sale yield after five but within ten years (percent) 4.24%
Available-for-sale amount after ten years $ 0
Available-for-sale yield after ten years (percent) 0.00%