Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021
Available-for-Sale Debt Securities:
Due within one year, fair value		$ 327
Due from one to five years, fair value		844
Due from five to ten years, fair value		1,305
Due after ten years, fair value		3,188
Fair Value		5,664	$ 5,780
Mortgage-Related Securities
Available-for-Sale Debt Securities:
Due within one year		28
Due from one to five years		141
Due from five to ten years		241
Due after ten years		2,362
Amortized Cost		2,772
U.S. Government and GSE obligations
Available-for-Sale Debt Securities:
Due within one year		295
Due from one to five years		247
Due from five to ten years		674
Due after ten years		829
Amortized Cost		2,045
State, County, and Municipal
Available-for-Sale Debt Securities:
Due from five to ten years		19
Amortized Cost		19
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]	517
Due after ten years	[1]	444
Amortized Cost	[1]	$ 1,424

[1] Includes corporate bonds, capital trust notes, foreign notes and asset-backed securities.