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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details) $ in Millions | Sep. 30, 2021 USD ($)
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Available-for-Sale Debt Securities: |  |
Due within one year | $ 95 |
Due from one to five years | 646 |
Due from five to ten years | 1,065 |
Due after ten years | 4,092 |
Total debt securities available for sale | 5,898 |
Mortgage-Related Securities |  |
Available-for-Sale Debt Securities: |  |
Due within one year | 26 |
Due from one to five years | 193 |
Due from five to ten years | 197 |
Due after ten years | 2,566 |
Total debt securities available for sale | $ 2,982 |
Available-for-Sale Securities, Average Yield |  |
Due within one year, Average Yield | 2.72% |
Due from one to five years, Average Yield | 3.25% |
Due from five to ten years, Average Yield | 2.52% |
Due after ten years, Average Yield | 1.85% |
Total securities available for sale, Average Yield | 1.99% |
U.S. Government and GSE obligations |  |
Available-for-Sale Debt Securities: |  |
Due within one year | $ 69 |
Due from one to five years | 22 |
Due from five to ten years | 317 |
Due after ten years | 1,070 |
Total debt securities available for sale | $ 1,478 |
Available-for-Sale Securities, Average Yield |  |
Due within one year, Average Yield | 0.17% |
Due from one to five years, Average Yield | 3.52% |
Due from five to ten years, Average Yield | 1.58% |
Due after ten years, Average Yield | 1.54% |
Total securities available for sale, Average Yield | 1.51% |
State, County, and Municipal |  |
Available-for-Sale Debt Securities: |  |
Due from five to ten years | $ 19 |
Due after ten years | 6 |
Total debt securities available for sale | $ 25 |
Available-for-Sale Securities, Average Yield |  |
Due from five to ten years, Average Yield | 3.52% | [1]
Due after ten years, Average Yield | 3.33% | [1]
Total securities available for sale, Average Yield | 3.48% | [1]
Other Debt Securities |  |
Available-for-Sale Debt Securities: |  |
Due from one to five years | $ 403 | [2]
Due from five to ten years | 523 | [2]
Due after ten years | 509 | [2]
Total debt securities available for sale | $ 1,435 | [2]
Available-for-Sale Securities, Average Yield |  |
Due from one to five years, Average Yield | 1.62% |
Due from five to ten years, Average Yield | 2.26% |
Due after ten years, Average Yield | 1.18% |
Total securities available for sale, Average Yield | 1.70% |
[1] | Not presented on a tax-equivalent basis.
[2] | Includes corporate bonds, capital trust notes, foreign notes and asset-backed securities.

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