Fair Value (Fair Value Measured on Recurring and Nonrecurring Basis) (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
MBS – Other U.S. obligations – Ginnie Mae
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		$ 4	$ 4
US Obligations - Treasury | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale (AFS) securities		0	0
US Obligations - Treasury | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		4,315	1,762
Available-for-sale (AFS) securities		5,353	5,288
US Obligations - Treasury | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale (AFS) securities		0	0
US Obligations - Treasury | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		4,315	1,762
Available-for-sale (AFS) securities		5,353	5,288
MBS – Other U.S. obligations – Ginnie Mae | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
MBS – Other U.S. obligations – Ginnie Mae | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		4	4
MBS – Other U.S. obligations – Ginnie Mae | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
MBS – Other U.S. obligations – Ginnie Mae | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		4	4
Trading securities		4,319	1,766
Available-for-sale (AFS) securities	[1]	16,175	15,495
Advances	[2]	4,334	4,370
Derivative Asset, Netting adjustments	[3]	(17)	11
Derivative assets, net		62	33
Derivative Liability, Netting adjustments	[3]	(1,055)	(384)
Derivative liabilities, net		0	0
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale (AFS) securities		0	0
Other assets	[4]	16	19
Mortgage loans held for portfolio		0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		4,319	1,766
Available-for-sale (AFS) securities		13,949	12,898
Derivative Asset, Netting adjustments	[5]	17	(11)
Other assets	[4]	0	0
Derivative Liability, Netting adjustments	[5]	(1,055)	(384)
Mortgage loans held for portfolio		3,320	3,332
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale (AFS) securities		2,226	2,597
Other assets	[4]	0	0
Mortgage loans held for portfolio		0	0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Advances	[6]	4,334	4,370
Derivative Asset, Netting adjustments	[7]	17	(11)
Derivative Liability, Netting adjustments	[7]	(1,055)	(384)
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale (AFS) securities		0	0
Advances	[6]	0	0
Other assets		16	19
Total fair value measurements – Assets		16	19
Total recurring fair value measurements – Liabilities		0	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		4,319	1,766
Available-for-sale (AFS) securities		13,949	12,898
Advances	[6]	4,334	4,370
Other assets		0	0
Total fair value measurements – Assets		22,647	19,078
Total recurring fair value measurements – Liabilities		1,309	721
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0	0
Available-for-sale (AFS) securities		2,226	2,597
Advances	[6]	0	0
Other assets		0	0
Total fair value measurements – Assets		2,226	2,597
Total recurring fair value measurements – Liabilities		0	0
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value measurements – Assets	[8]	0	0
Mortgage loans held for portfolio		0	0	[8]
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value measurements – Assets	[8]	0	0
Mortgage loans held for portfolio		0	0	[8]
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value measurements – Assets	[8]	2	1
Mortgage loans held for portfolio	[8]	2	1
Consolidated obligation bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds		254	337
Consolidated obligation bonds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds		0	0
Consolidated obligation bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds		77,992	71,386
Consolidated obligation bonds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds		0	0
Consolidated obligation bonds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds	[9]	254	337
Consolidated obligation bonds | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds	[9]	0	0
Consolidated obligation bonds | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds	[9]	254	337
Consolidated obligation bonds | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds	[9]	0	0
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		4,319	1,766
Available-for-sale (AFS) securities		16,175	15,495
Derivative assets, net	[5]	62	33
Other assets	[4]	16	19
Derivative liabilities, net	[5]	0	0
Mortgage loans held for portfolio		3,320	3,332
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		4,319	1,766
Available-for-sale (AFS) securities		16,175	15,495
Other assets		16	19
Total fair value measurements – Assets		24,906	21,683
Total recurring fair value measurements – Liabilities		254	337
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fair value measurements – Assets	[8]	2	1
Mortgage loans held for portfolio	[8]	2	1
Estimate of Fair Value Measurement | Consolidated obligation bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds		77,992	71,386
Interest rate swaps | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Netting adjustments	[7]	17	(11)
Derivative Liability, Netting adjustments	[7]	(1,055)	(384)
Interest rate swaps | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		0	0
Derivative liabilities, net		0	0
Interest rate swaps | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		42	44
Derivative liabilities, net		1,055	384
Interest rate swaps | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		0	0
Derivative liabilities, net		0	0
Interest rate swaps | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		59	33
Derivative liabilities, net		0	0
MBS – GSEs – multifamily: | MBS – Other U.S. obligations – Ginnie Mae
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		8,596	7,610
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		3
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		0
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		3
Residential Mortgage Backed Securities | Subtotal PLRMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		2,226	2,597
Residential Mortgage Backed Securities | Subtotal PLRMBS | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		0	0
Residential Mortgage Backed Securities | Subtotal PLRMBS | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		0	0
Residential Mortgage Backed Securities | Subtotal PLRMBS | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		2,226	2,597
Residential Mortgage Backed Securities | Subtotal PLRMBS | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		2,226	2,597
Residential Mortgage Backed Securities | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		0	0
Residential Mortgage Backed Securities | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		8,596	7,610
Residential Mortgage Backed Securities | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		2,226	2,597
Residential Mortgage Backed Securities | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		10,822	10,207
Residential Mortgage Backed Securities | MBS – GSEs – multifamily: | MBS – Other U.S. obligations – Ginnie Mae | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		0	0
Residential Mortgage Backed Securities | MBS – GSEs – multifamily: | MBS – Other U.S. obligations – Ginnie Mae | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		8,596	7,610
Residential Mortgage Backed Securities | MBS – GSEs – multifamily: | MBS – Other U.S. obligations – Ginnie Mae | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		0	0
Residential Mortgage Backed Securities | MBS – GSEs – multifamily: | MBS – Other U.S. obligations – Ginnie Mae | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		$ 8,596	$ 7,610

[1] At March 31, 2020, $643 of these securities were pledged as collateral that may be repledged. At December 31, 2019, $381 of these securities were pledged as collateral that may be repledged.

[2] At March 31, 2020, and December 31, 2019, none of these advances were 90 days or more past due or had been placed on nonaccrual status.

[3] Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty. Cash collateral posted and related accrued interest was $1,082 and $378 at March 31, 2020, and December 31, 2019, respectively. Cash collateral received and related accrued interest was $9 and $5 at March 31, 2020, and December 31, 2019, respectively.

[4] Represents publicly traded mutual funds held in a grantor trust.

[5] Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty.

[6] Represents advances recorded under the fair value option at March 31, 2020, and December 31, 2019.

[7] Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed by the Bank, with the same clearing agents and/or counterparty

[8] The fair value information presented is as of the date the fair value adjustment was recorded during the three months ended March 31, 2020

[9] Represents consolidated obligation bonds recorded under the fair value option at March 31, 2020, and December 31, 2019