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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Available-for-Sale Debt Securities:  
Due within one year $ 119
Due from one to five years 595
Due from five to ten years 1,200
Due after ten years 4,163
Total debt securities available for sale 6,077
Mortgage-Related Securities  
Available-for-Sale Debt Securities:  
Due from one to five years 242
Due from five to ten years 163
Due after ten years 2,572
Total debt securities available for sale $ 2,977
Available-for-Sale Securities, Average Yield  
Due from one to five years, Average Yield 3.19%
Due from five to ten years, Average Yield 2.47%
Due after ten years, Average Yield 1.93%
Total securities available for sale, Average Yield 2.06%
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 380
Due after ten years 1,096
Total debt securities available for sale $ 1,567
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 1.95%
Due after ten years, Average Yield 1.56%
Total securities available for sale, Average Yield 1.62%
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 within one year $ 50 [2]
Due from one to five years 303 [2]
Due from five to ten years 625 [2]
Due after ten years 521 [2]
Total debt securities available for sale $ 1,499 [2]
Available-for-Sale Securities, Average Yield  
Due within one year, Average Yield 2.97%
Due from one to five years, Average Yield 1.74%
Due from five to ten years, Average Yield 2.24%
Due after ten years, Average Yield 1.21%
Total securities available for sale, Average Yield 1.81%
[1] Not presented on a tax-equivalent basis.
[2] Includes corporate bonds, capital trust notes, foreign notes and asset-backed securities.