v3.26.1
Securities - Distribution of Maturities of Debt Securities with Approximate Yield of Portfolio (Detail)
$ in Millions
Jun. 30, 2026
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 1,811
Available-for-sale yield within one year (percent) 1.18%
Available-for-sale amount after one but within five years $ 11,560
Available-for-sale yield after one but within five years (percent) 3.68%
Available-for-sale amount after five but within ten years $ 4,608
Available-for-sale yield after five but within ten years (percent) 4.10%
Available-for-sale amount after ten years $ 16,557
Available-for-sale yield after ten years (percent) 3.04%
Total fair value within one year $ 1,810
Total fair value after one but within five years 11,538
Total fair value after five but within ten years 4,611
Total fair value after ten years 14,858
Held-to-maturity amount within one year $ 114
Held-to-maturity yield within one year (percent) 4.03%
Held-to-maturity amount after one but within five years $ 3,396
Held-to-maturity yield after one but within five years (percent) 3.65%
Held-to-maturity after five but within ten years $ 3,212
Held-to-maturity yield after five but within ten years (percent) 4.00%
Held-to-maturity after ten years $ 13,767
Held-to-maturity yield after ten years (percent) 4.65%
Total fair value within one year $ 114
Total fair value after one but within five years 3,350
Total fair value after five but within ten years 3,160
Total fair value after ten years 13,497
U.S. Treasury  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 118
Available-for-sale yield within one year (percent) 1.67%
Available-for-sale amount after one but within five years $ 9,381
Available-for-sale yield after one but within five years (percent) 3.67%
Available-for-sale amount after five but within ten years $ 3,663
Available-for-sale yield after five but within ten years (percent) 4.10%
Available-for-sale amount after ten years $ 2,357
Available-for-sale yield after ten years (percent) 3.36%
Held-to-maturity amount within one year $ 114
Held-to-maturity yield within one year (percent) 4.03%
Held-to-maturity amount after one but within five years $ 3,222
Held-to-maturity yield after one but within five years (percent) 3.69%
Held-to-maturity after five but within ten years $ 2,644
Held-to-maturity yield after five but within ten years (percent) 4.07%
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 $ 58
Available-for-sale yield within one year (percent) 1.88%
Available-for-sale amount after one but within five years $ 289
Available-for-sale yield after one but within five years (percent) 1.68%
Available-for-sale amount after five but within ten years $ 1
Available-for-sale yield after five but within ten years (percent) 2.61%
Available-for-sale amount after ten years $ 4,082
Available-for-sale yield after ten years (percent) 1.85%
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 $ 172
Held-to-maturity yield after one but within five years (percent) 2.94%
Held-to-maturity after five but within ten years $ 561
Held-to-maturity yield after five but within ten years (percent) 3.65%
Held-to-maturity after ten years $ 281
Held-to-maturity yield after ten years (percent) 2.91%
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 $ 58
Available-for-sale yield after five but within ten years (percent) 3.13%
Available-for-sale amount after ten years $ 9,862
Available-for-sale yield after ten years (percent) 3.41%
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 $ 7
Held-to-maturity yield after five but within ten years (percent) 6.06%
Held-to-maturity after ten years $ 13,486
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) 3.47%
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 $ 33
Available-for-sale yield after one but within five years (percent) 4.35%
Available-for-sale amount after five but within ten years $ 46
Available-for-sale yield after five but within ten years (percent) 3.88%
Available-for-sale amount after ten years $ 216
Available-for-sale yield after ten years (percent) 4.98%
Foreign debt securities  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 1,635
Available-for-sale yield within one year (percent) 1.12%
Available-for-sale amount after one but within five years $ 1,857
Available-for-sale yield after one but within five years (percent) 4.05%
Available-for-sale amount after five but within ten years $ 840
Available-for-sale yield after five but within ten years (percent) 4.20%
Available-for-sale amount after ten years $ 40
Available-for-sale yield after ten years (percent) 4.64%