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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Available-for-Sale Debt Securities:
Due within one year, fair value		$ 179
Due from one to five years, fair value		620
Due from five to ten years, fair value		1,395
Due after ten years, fair value		3,418
Fair Value		5,612	$ 5,780
Mortgage-Related Securities
Available-for-Sale Debt Securities:
Due within one year		30
Due from one to five years		131
Due from five to ten years		267
Due after ten years		2,378
Amortized Cost		2,806
U.S. Government and GSE obligations
Available-for-Sale Debt Securities:
Due within one year		144
Due from one to five years		22
Due from five to ten years		673
Due after ten years		829
Amortized Cost		1,668
State, County, and Municipal
Available-for-Sale Debt Securities:
Due from five to ten years		19
Due after ten years		6
Amortized Cost		25
Other Debt Securities
Available-for-Sale Debt Securities:
Due within one year	[1]	5
Due from one to five years	[1]	458
Due from five to ten years	[1]	519
Due after ten years	[1]	481
Amortized Cost	[1]	$ 1,463
[1] Includes corporate bonds, capital trust notes, foreign notes and asset-backed securities.

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