Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Available-for-Sale Debt Securities:
Due within one year, fair value		$ 1,657
Due from one to five years, fair value		804
Due from five to ten years, fair value		1,656
Due after ten years, fair value		4,943
Fair value		9,060	$ 5,780
Mortgage-Related Securities
Available-for-Sale Debt Securities:
Due within one year		52
Due from one to five years		195
Due from five to ten years		277
Due after ten years		4,718
Amortized Cost		5,242
U.S. Government and GSE obligations
Available-for-Sale Debt Securities:
Due within one year		1,588
Due from one to five years		150
Due from five to ten years		1,177
Due after ten years		325
Amortized Cost		3,240
State, County, and Municipal
Available-for-Sale Debt Securities:
Due within one year		2
Due from five to ten years		18
Due after ten years		10
Amortized Cost		30
Other Debt Securities
Available-for-Sale Debt Securities:
Due within one year	[1]	20
Due from one to five years	[1]	472
Due from five to ten years	[1]	509
Due after ten years	[1]	404
Amortized Cost	[1]	$ 1,405

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