Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($) $ in Millions	Dec. 31, 2021		Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 5,780		$ 5,813
Equity Securities, Fair Value	16		32
Total Equity Securities, Amortized Cost	5,850	[1]	5,744	[2]
Total Equity Securities, Gross Unrealized Gain	62	[1]	131	[2]
Total Equity Securities, Gross Unrealized Loss	116	[1]	30	[2]
Total Equity Securities, Fair Value	5,796	[1]	5,845	[2]
Mortgage-Related Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,819		2,942
Gross Unrealized Gain	31		99
Gross Unrealized Loss	60		3
Fair Value	2,790		3,038
Mortgage-Related Securities | GSE Certificates
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,102		1,155
Gross Unrealized Gain	20		54
Gross Unrealized Loss	15
Fair Value	1,107		1,209
Mortgage-Related Securities | GSE CMOs
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,717		1,787
Gross Unrealized Gain	11		45
Gross Unrealized Loss	45		3
Fair Value	1,683		1,829
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,015		2,771
Gross Unrealized Gain	31		32
Gross Unrealized Loss	56		27
Fair Value	2,990		2,776
Debt Securities | U.S. Treasury Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	45		65
Fair Value	45		65
Debt Securities | GSE Debentures
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,524		1,158
Gross Unrealized Gain	1		4
Gross Unrealized Loss	45		4
Fair Value	1,480		1,158
Debt Securities | Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	479	[3]	530	[4]
Gross Unrealized Gain	3	[3]	2	[4]
Gross Unrealized Loss	3	[3]	6	[4]
Fair Value	479	[3]	526	[4]
Debt Securities | Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25		26
Gross Unrealized Gain			1
Fair Value	25		27
Debt Securities | Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	821		871
Gross Unrealized Gain	18		18
Gross Unrealized Loss	1		6
Fair Value	838		883
Debt Securities | Foreign Notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25		25
Gross Unrealized Gain	1		1
Fair Value	26		26
Debt Securities | Capital Trust Notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	96		96
Gross Unrealized Gain	8		6
Gross Unrealized Loss	7		11
Fair Value	97		91
Mortgage Backed Securities And Other Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,834		5,713
Gross Unrealized Gain	62		131
Gross Unrealized Loss	116		30
Fair Value	5,780		5,814
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Amortized Cost	16		31
Equity Securities, Fair Value	16		31
Equity Securities | Preferred Stock
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Amortized Cost			15
Equity Securities, Fair Value			15
Equity Securities | Mutual Funds
Schedule of Available-for-sale Securities [Line Items]
Equity Securities, Amortized Cost	16		16
Equity Securities, Fair Value	$ 16		$ 16

[1] Excludes accrued interest receivable of $15 million included in other assets in the Consolidated Statements of Condition.

[2] Excludes accrued interest receivable of $15 million included in other assets in the Consolidated Statements of Condition.

[3] The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government..

[4] The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.