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Securities - Distribution of maturities of debt securities with approximate yield of portfolio (Detail)
$ in Millions
Mar. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 3,308
Available-for-sale yield within one year 1.36%
Available-for-sale amount after one but within five years $ 5,336
Available-for-sale yield after one but within five years 1.44%
Available-for-sale amount after five but within ten years $ 8,215
Available-for-sale yield after five but within ten years 1.79%
Available-for-sale amount after ten years $ 17,602
Available-for-sale yield after ten years 2.02%
Total fair value within one year $ 3,326
Total fair value after one but within five years 5,454
Total fair value after five but within ten years 8,286
Total fair value after ten years 17,593
Held-to-maturity amount within one year $ 75
Held-to-maturity yield within one year 2.39%
Held-to-maturity amount after one but within five years $ 255
Held-to-maturity yield after one but within five years 2.78%
Held-to-maturity after five but within ten years $ 410
Held-to-maturity yield after five but within ten years 2.31%
Held-to-maturity after ten years $ 7,099
Held-to-maturity yield after ten years 2.66%
Total fair value within one year $ 75
Total fair value after one but within five years 265
Total fair value after five but within ten years 425
Total fair value after ten years 7,401
U.S. Treasury [Member]  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 1,437
Available-for-sale yield within one year 2.41%
Available-for-sale amount after one but within five years $ 3,097
Available-for-sale yield after one but within five years 1.56%
Available-for-sale amount after five but within ten years $ 5,384
Available-for-sale yield after five but within ten years 1.35%
Available-for-sale amount after ten years $ 3,656
Available-for-sale yield after ten years 2.27%
US Government-sponsored enterprises [Member]  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 31
Available-for-sale yield within one year 2.71%
Available-for-sale amount after one but within five years $ 966
Available-for-sale yield after one but within five years 1.94%
Available-for-sale amount after five but within ten years $ 2,771
Available-for-sale yield after five but within ten years 2.56%
Available-for-sale amount after ten years $ 6,154
Available-for-sale yield after ten years 1.74%
Held-to-maturity amount within one year $ 74
Held-to-maturity yield within one year 2.39%
Held-to-maturity amount after one but within five years $ 242
Held-to-maturity yield after one but within five years 2.71%
Held-to-maturity after five but within ten years $ 397
Held-to-maturity yield after five but within ten years 2.24%
Held-to-maturity after ten years $ 988
Held-to-maturity yield after ten years 3.27%
US Government agency issued or guaranteed [Member]  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 0
Available-for-sale yield within one year 0.00%
Available-for-sale amount after one but within five years $ 96
Available-for-sale yield after one but within five years 1.79%
Available-for-sale amount after five but within ten years $ 1
Available-for-sale yield after five but within ten years 7.87%
Available-for-sale amount after ten years $ 7,717
Available-for-sale yield after ten years 2.12%
Held-to-maturity amount within one year $ 0
Held-to-maturity yield within one year 0.00%
Held-to-maturity amount after one but within five years $ 8
Held-to-maturity yield after one but within five years 4.02%
Held-to-maturity after five but within ten years $ 11
Held-to-maturity yield after five but within ten years 4.76%
Held-to-maturity after ten years $ 6,109
Held-to-maturity yield after ten years 2.56%
Obligations of U.S. states and political subdivisions [Member]  
Debt Securities, Available-for-sale [Line Items]  
Held-to-maturity amount within one year $ 1
Held-to-maturity yield within one year 2.72%
Held-to-maturity amount after one but within five years $ 5
Held-to-maturity yield after one but within five years 3.47%
Held-to-maturity after five but within ten years $ 2
Held-to-maturity yield after five but within ten years 4.21%
Held-to-maturity after ten years $ 0
Held-to-maturity yield after ten years 0.00%
Asset-backed securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 0
Available-for-sale yield within one year 0.00%
Available-for-sale amount after one but within five years $ 0
Available-for-sale yield after one but within five years 0.00%
Available-for-sale amount after five but within ten years $ 59
Available-for-sale yield after five but within ten years 5.06%
Available-for-sale amount after ten years $ 75
Available-for-sale yield after ten years 3.36%
Held-to-maturity amount within one year $ 0
Held-to-maturity yield within one year 0.00%
Held-to-maturity amount after one but within five years $ 0
Held-to-maturity yield after one but within five years 0.00%
Held-to-maturity after five but within ten years $ 0
Held-to-maturity yield after five but within ten years 0.00%
Held-to-maturity after ten years $ 2
Held-to-maturity yield after ten years 5.85%
Foreign debt securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Available-for-sale amount within one year $ 1,840
Available-for-sale yield within one year 0.51%
Available-for-sale amount after one but within five years $ 1,177
Available-for-sale yield after one but within five years 0.68%
Available-for-sale amount after five but within ten years $ 0
Available-for-sale yield after five but within ten years 0.00%
Available-for-sale amount after ten years $ 0
Available-for-sale yield after ten years 0.00%