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Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($)
$ in Millions

Sep. 30, 2021

Dec. 31, 2020

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

$ 5,936

^[1]

$ 5,744

^[2]

Gross Unrealized Gain

82

^[1]

131

^[2]

Gross Unrealized Loss

104

^[1]

30

^[2]

Fair Value

5,914

^[1]

5,845

^[2]

Mortgage-Related Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

2,982

2,942

Gross Unrealized Gain

47

99

Gross Unrealized Loss

50

3

Fair Value

2,979

3,038

Mortgage-Related Securities | GSE Certificates

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

1,117

1,155

Gross Unrealized Gain

28

54

Gross Unrealized Loss

15

Fair Value

1,130

1,209

Mortgage-Related Securities | GSE CMOs

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

1,865

1,787

Gross Unrealized Gain

19

45

Gross Unrealized Loss

35

3

Fair Value

1,849

1,829

Debt Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

2,938

2,771

Gross Unrealized Gain

35

32

Gross Unrealized Loss

54

27

Fair Value

2,919

2,776

Debt Securities | U.S. Treasury Obligations

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

65

65

Fair Value

65

65

Debt Securities | GSE Debentures

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

1,413

1,158

Gross Unrealized Gain

2

4

Gross Unrealized Loss

43

4

Fair Value

1,372

1,158

Debt Securities | Asset-backed Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

493

^[3]

530

^[4]

Gross Unrealized Gain

4

^[3]

2

^[4]

Gross Unrealized Loss

2

^[3]

6

^[4]

Fair Value

495

^[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

21

18

Gross Unrealized Loss

1

6

Fair Value

841

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

7

6

Gross Unrealized Loss

8

11

Fair Value

95

91

Mortgage Backed Securities And Other Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

5,920

5,713

Gross Unrealized Gain

82

131

Gross Unrealized Loss

104

30

Fair Value

5,898

5,814

Equity Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

16

31

Fair Value

16

31

Equity Securities | Preferred Stock

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

15

Fair Value

15

Equity Securities | Mutual Funds

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

16

16

Fair Value

$ 16

$ 16

[1]	Excludes accrued interest receivable of $14 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.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

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