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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Available-for-Sale Debt Securities:
Due within one year, fair value		$ 1,701
Due from one to five years, fair value		807
Due from five to ten years, fair value		1,544
Due after ten years, fair value		2,637
Fair Value		6,689	$ 5,780
Mortgage-Related Securities
Available-for-Sale Debt Securities:
Due within one year		4
Due from one to five years		143
Due from five to ten years		219
Due after ten years		2,311
Amortized Cost		2,677
U.S. Government and GSE obligations
Available-for-Sale Debt Securities:
Due within one year		1,677
Due from one to five years		247
Due from five to ten years		1,077
Due after ten years		425
Amortized Cost		3,426
State, County, and Municipal
Available-for-Sale Debt Securities:
Due from five to ten years		18
Amortized Cost		18
Other Debt Securities
Available-for-Sale Debt Securities:
Due within one year	[1]	25
Due from one to five years	[1]	428
Due from five to ten years	[1]	527
Due after ten years	[1]	426
Amortized Cost	[1]	$ 1,406
[1] Includes corporate bonds, capital trust notes, foreign notes and asset-backed securities.

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