Federal Home Loan Bank Of San Francisco 10-Q 6 Nov 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2020	Oct. 31, 2020
Entity Information
Document Transition Report	false
Document Quarterly Report	true
Entity Incorporation, State or Country Code	X1
Entity Registrant Name	FEDERAL HOME LOAN BANK OF SAN FRANCISCO
Entity Central Index Key	0001316944
Document Type	10-Q
Entity File Number	000-51398
Document Period End Date	Sep. 30, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Tax Identification Number	94-6000630
Entity Address, Address Line One	333 Bush Street, Suite 2700
Entity Address, City or Town	San Francisco,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94104
City Area Code	415
Local Phone Number	616-1000
Entity Interactive Data Current	Yes
Entity Shell Company	false
Common Stock, Shares, Outstanding		24,442,936

Statements of Condition

Statements of Condition - USD ($) shares in Millions, $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Assets:
Cash and due from banks		$ 175	$ 118
Interest-bearing deposits		1,478	2,269
Securities purchased under agreements to resell		6,750	7,000
Federal funds sold		2,323	3,562
Trading Securities	[1]	4,281	1,766
Available-for-sale (AFS) securities (amortized cost of $14,543 and $15,206, respectively)	[2]	14,671	15,495
Held-to-maturity (HTM) securities (fair values were $5,755 and $7,566, respectively)	[1]	5,718	7,545
Advances (includes $3,103 and $4,370 at fair value under the fair value option, respectively)		37,693	65,374
Mortgage loans held for portfolio, net		2,404	3,314
Accrued interest receivable		100	139
Derivative assets, net		56	33
Other assets		221	227
Total Assets		75,870	106,842
Liabilities:
Deposits		1,006	537
Consolidated obligations:
Bonds (includes $112 and $337 at fair value under the fair value option, respectively)		54,921	71,372
Discount notes		13,300	27,376
Total consolidated obligations		68,221	98,748
Mandatorily redeemable capital stock		2	138
Accrued interest payable		31	164
Affordable Housing Program (AHP) payable		129	152
Derivative liabilities, net		1	0
Other liabilities		260	362
Total Liabilities		69,650	100,101
Commitments and Contingencies (Note 13)
Capital:
Capital stock-Class B-Putable ($100 par value) issued and outstanding: 25 shares and 30 shares, respectively		2,465	3,000
Unrestricted retained earnings		2,858	2,754
Restricted retained earnings		761	713
Total Retained Earnings		3,619	3,467
Accumulated other comprehensive income/(loss) (AOCI)		136	274
Total Capital		6,220	6,741
Total Liabilities and Capital		75,870	106,842
Amortized Cost of AFS	[3]	14,543	15,206
HTM Securities, Fair Value		5,755	7,566
Fair Value of Advances Under the Fair Value Option	[4]	$ 3,103	4,370
Common stock, par value		$ 100
Available-for-sale securities pledged as collateral that may be repledged		$ 386	381
Consolidated obligation bonds
Fair Value of Bonds Under the Fair Value Option		$ 112	$ 337
Common Class B [Member]
Common stock, par value		$ 100	$ 100
Common Stock, Shares, Outstanding		25	30
Common Stock, Shares, Issued		25	30
[1]	At September 30, 2020, and December 31, 2019, none of these securities were pledged as collateral that may be repledged.
[2]	At September 30, 2020, $386 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.
[3]	Amortized cost includes unpaid principal balance, unamortized premiums and discounts, net charge-offs, and valuation adjustments for hedging activities, and excludes accrued interest receivable of $48 and $58 at September 30, 2020, and December 31, 2019, respectively.
[4]	At September 30, 2020, and December 31, 2019, none of these advances were 90 days or more past due or had been placed on nonaccrual status.

Statements of Condition (Parent

Statements of Condition (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
HTM securities pledged as collateral that may be repledged	$ 0	$ 0
Trading securities pledged as collateral that may be repledged	$ 0	$ 0

Statements of Income

Statements of Income - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019
Interest Income:
Advances	$ 88		$ 389		$ 509	$ 1,343
Interest-bearing deposits	1		14		14	40
Securities purchased under agreements to resell	1		45		20	144
Federal funds sold	1		22		16	99
Trading securities	23		1		61	8
AFS securities	67		100		179	261
HTM securities	19		65		92	219
Mortgage loans held for portfolio	7		18		22	55
Total Interest Income	207		654		913	2,169
Interest Expense:
Bonds	47		409		405	1,306
Discount notes	12		128		163	480
Deposits	0		2		2	6
Mandatorily redeemable capital stock	1	[1]	3	[1]	5	11
Total Interest Expense	60		542		575	1,803
Net Interest Income	147		112		338	366
Provision for/(reversal of) credit loss	(2)		0		30	0
Net Interest Income After Provision for/(Reversal of) Credit Losses	149		112		308	366
Other Income/(Loss):
Net gain/(loss) on trading securities	(19)		0		36	(1)
Net gain/(loss) on advances and net (gain)/loss on consolidated obligation bonds from changes in fair value recognized in earnings	(7)		20		96	111
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	5		(20)		(156)	(109)
Gain on disgorgement settlement	85		0		85	0
Other, net	6		3		18	10
Total Other Income/(Loss)	70		3		79	11
Other Expense:
Compensation and benefits	23		20		65	61
Other operating expense	14		17		41	50
Federal Housing Finance Agency	2		2		6	5
Office of Finance	1		2		4	5
Quality Jobs Fund expense	0		5		0	15
Other, net	0		1		3	2
Total Other Expense	40		47		119	138
Income/(Loss) Before Assessment	179		68		268	239
AHP Assessment	18		7		27	25
Net Income/(Loss)	$ 161		$ 61		$ 241	$ 214
[1]	The Bank excludes interest expense on mandatorily redeemable capital stock from adjusted net interest income in its analysis of financial performance for its two operating segments

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income/(Loss)	$ 161	$ 61	$ 241	$ 214
Other Comprehensive Income/(Loss):
Unrealized gain/(loss) on AFS securities	172	(17)	(138)	30
Net change in pension and postretirement benefits	(1)	0	(1)	0
Net non-credit-related OTTI gain/(loss) on AFS securities	0	(16)	0	1
Net non-credit-related OTTI gain/(loss) on HTM securities	0	0	1	1
Total other comprehensive income/(loss)	171	(33)	(138)	32
Comprehensive Income (Loss)	$ 332	$ 28	$ 103	$ 246

Statements of Capital Accounts

Statements of Capital Accounts - USD ($) shares in Millions, $ in Millions	Total	Total Retained Earnings	Total Restricted Retained Earnings	Unrestricted Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Common Class B - PutableCommon Stock	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Total Retained Earnings	Cumulative Effect, Period of Adoption, Adjustment [Member]Unrestricted Retained Earnings	Cumulative Effect, Period of Adoption, Adjustment [Member]Accumulated Other Comprehensive Income/(Loss)
Balance, Shares at Dec. 31, 2018						29
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of capital stock, shares						8
Repurchase of capital stock, shares						(8)
Capital stock reclassified from/(to) mandatorily redeemable capital stock, net shares						0
Balance, Shares at Sep. 30, 2019						29
Balance at Dec. 31, 2018	$ 6,530	$ 3,346	$ 647	$ 2,699	$ 235	$ 2,949
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss)	246	214	43	171	32
Issuance of capital stock, value	837					837
Repurchase of capital stock, value	(884)					(884)
Capital stock reclassified from/(to) mandatorily redeemable capital stock, net, value	(4)					(4)
Partial Recovery of Prior Capital Distribution to Financing Corporation	0
Cash dividends on capital stock	(155)	(155)		(155)
Balance at Sep. 30, 2019	$ 6,570	3,405	690	2,715	267	$ 2,898
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Cash, Annualized Rate	7.00%
Balance, Shares at Jun. 30, 2019						30
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of capital stock, shares						1
Repurchase of capital stock, shares						(2)
Capital stock reclassified from/(to) mandatorily redeemable capital stock, net shares						0
Balance, Shares at Sep. 30, 2019						29
Balance at Jun. 30, 2019	$ 6,664	3,397	678	2,719	300	$ 2,967
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss)	28	61	12	49	(33)
Issuance of capital stock, value	141					141
Repurchase of capital stock, value	(206)					(206)
Capital stock reclassified from/(to) mandatorily redeemable capital stock, net, value	(4)					(4)
Cash dividends on capital stock	(53)	(53)		(53)
Balance at Sep. 30, 2019	$ 6,570	3,405	690	2,715	267	$ 2,898
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Cash, Annualized Rate	7.00%
Retained Earnings (Accumulated Deficit)	$ 3,467
Balance, Shares at Dec. 31, 2019						30
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of capital stock, shares						8
Repurchase of capital stock, shares						(13)
Capital stock reclassified from/(to) mandatorily redeemable capital stock, net shares						0
Balance, Shares at Sep. 30, 2020						25
Balance at Dec. 31, 2019	6,741	3,467	713	2,754	274	$ 3,000
Balance (Adjustment for cumulative effect of accounting change) at Dec. 31, 2019										$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss)	103	241	48	193	(138)
Issuance of capital stock, value	781					781
Repurchase of capital stock, value	(1,313)					(1,313)
Capital stock reclassified from/(to) mandatorily redeemable capital stock, net, value	(3)					(3)
Partial Recovery of Prior Capital Distribution to Financing Corporation	40	40		40
Cash dividends on capital stock	(126)	(126)		(126)
Balance at Sep. 30, 2020	$ 6,220	3,619	761	2,858	136	$ 2,465
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Cash, Annualized Rate	5.68%
Balance, Shares at Jun. 30, 2020						27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of capital stock, shares						0
Repurchase of capital stock, shares						(2)
Balance, Shares at Sep. 30, 2020						25
Balance at Jun. 30, 2020	$ 6,127	3,494	729	2,765	(35)	$ 2,668
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income (Loss)	332	161	32	129	171
Issuance of capital stock, value	30					30
Repurchase of capital stock, value	(233)					(233)
Capital stock reclassified from/(to) mandatorily redeemable capital stock, net, value	0
Cash dividends on capital stock	(36)	(36)		(36)
Balance at Sep. 30, 2020	$ 6,220	$ 3,619	$ 761	$ 2,858	$ 136	$ 2,465
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends, Cash, Annualized Rate	5.00%
Retained Earnings (Accumulated Deficit)	$ 3,619
Retained Earnings (Accumulated Deficit) | Adjustment for cumulative effect of accounting change							$ 3	$ 3	$ 3

Statements of Cash Flows

Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Net Cash Provided by (Used in) Operating Activities
Net Income/(Loss)	$ 241	$ 214
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:
Depreciation and amortization	15	(37)
Provision for/(reversal of) credit loss	30	0
Change in net fair value of Trading Securities	(36)	1
Change in net fair value adjustment on advances and consolidated obligation bonds held under the fair value option	(96)	(111)
Change in net derivatives and hedging activities	(1,180)	(422)
Other Adjustments	7	19
Net change in:
Accrued interest receivable	41	1
Other assets	(2)	(13)
Accrued interest payable	(133)	16
Other liabilities	(41)	(20)
Total adjustments	(1,395)	(566)
Net cash provided by/(used in) operating activities	(1,154)	(352)
Net Cash Provided by (Used in) Investing Activities
Interest-bearing deposits	834	223
Securities purchased under agreements to resell	250	(400)
Federal funds sold	1,239	(26)
Trading securities:
Proceeds	1	656
Purchases	(2,480)	0
AFS securities:
Proceeds	1,929	457
Purchases	(525)	(8,126)
HTM securities:
Proceeds	1,830	2,530
Advances:
Repaid	453,774	988,903
Originated	(425,576)	(977,846)
Mortgage loans held for portfolio:
Principal collected	1,295	556
Purchases	(446)	(910)
Other Investing Activities	(2)	(36)
Net cash provided by/(used in) investing activities	32,123	5,981
Net Cash Provided by (Used in) Financing Activities
Net change in deposits and other financing activities	472	375
Net change in borrowings from other FHLBanks	0	(250)
Payments for (Proceeds from) Hedge, Financing Activities	(133)	70
Net proceeds from issuance of consolidated obligations:
Bonds	41,669	57,223
Discount notes	98,750	107,298
Payments for matured and retired consolidated obligations:
Bonds	(58,137)	(62,141)
Discount notes	(112,776)	(107,841)
Proceeds from issuance of capital stock	781	837
Payments for repurchase/redemption of mandatorily redeemable capital stock	(139)	(93)
Payments for repurchase of capital stock	(1,313)	(884)
Cash dividends paid	(126)	(155)
Partial Recovery of Prior Capital Distribution to Financing Corporation	40	0
Net cash provided by/(used in) financing activities	(30,912)	(5,561)
Net increase/(decrease) in cash and due from banks	57	68
Cash and due from banks beginning of period	118	13
Cash and due from banks end of period	175	81
Supplemental Disclosures:
Interest paid	706	1,807
AHP payments	$ 50	$ 51

Basis of Presentation (Notes)

Basis of Presentation (Notes)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation The information about the Federal Home Loan Bank of San Francisco (Bank) included in these unaudited financial statements reflects all adjustments that, in the opinion of the Bank, are necessary for a fair statement of results for the periods presented. These adjustments are of a recurring nature, unless otherwise disclosed. The results of operations in these interim statements are not necessarily indicative of the results to be expected for any subsequent period or for the entire year ending December 31, 2020. These unaudited financial statements should be read in conjunction with the Bank’s Annual Report on Form 10-K for the year ended December 31, 2019 (2019 Form 10-K). There have been no changes to the basis of presentation of the Bank’s financial instruments meeting netting requirements or of the Bank’s investments in variable interest entities disclosed in “Item 8. Financial Statements and Supplementary Data – Note 1 – Summary of Significant Accounting Policies” in the Bank’s 2019 Form 10-K. Summary of Significant Accounting Policies Use of Estimates. The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) requires management to make a number of judgments, estimates, and assumptions that may affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of income, expenses, gains, and losses during the reporting period. The most significant of these estimates include: • accounting for derivatives; • estimating fair values of investments classified as trading and AFS, derivatives and associated hedged items carried at fair value in accordance with the accounting for derivative instruments and associated hedging activities, and financial instruments carried at fair value under the fair value option; and • estimating the prepayment speeds on mortgage-backed securities (MBS) and mortgage loans for the accounting of amortization of premiums and accretion of discounts and credit losses previously recorded prior to the adoption of new accounting guidance related to the measurement of credit losses on MBS and mortgage loans. Actual results could differ significantly from these estimates. Gain on Disgorgement Settlement. During the third quarter of 2020, the Bank received disgorgement proceeds in the amount of $85 in connection with a Securities and Exchange Commission enforcement action. Disgorgement proceeds are recorded in Other Income/(Loss) in “Gain on disgorgement settlement” in the Statements of Income. Disgorgement proceeds are considered realized and recorded when the Bank receives cash or assets that are readily convertible to known amounts of cash or claims to cash, when the Bank enters into a signed agreement that is not subject to appeal, where the counterparty has the ability to pay, and the amount to be received can be reasonably estimated. Prior to being realized or realizable, the Bank considers potential disgorgement proceeds to be gain contingencies, and therefore they are not recorded in the Statements of Income. Coronavirus Aid, Relief, and Economic Security Act (Troubled Debt Restructuring Relief). On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) providing optional, temporary relief from accounting for certain loan modifications as troubled debt restructurings (TDRs) was signed into law. Under the CARES Act, TDR relief is available to financial institutions for loan modifications related to the adverse effects of the COVID-19 pandemic (COVID-related modifications) granted to borrowers that were current as of December 31, 2019. TDR relief applies to COVID-related modifications made from March 1, 2020, until the earlier of December 31, 2020, or 60 days following the termination of the national emergency declared by the President of the United States. Starting in the second quarter of 2020, the Bank elected to apply the TDR relief provided by the CARES Act. As such, all COVID-related modifications meeting the provisions of the CARES Act will be excluded from TDR classification and accounting. COVID-related modifications that do not meet the provisions of the CARES Act will continue to be assessed for TDR classification. Update to Significant Accounting Policies - Measurement of Credit Losses on Financial Instruments, as Amended Beginning January 1, 2020, the Bank adopted new accounting guidance related to the measurement of credit losses on financial instruments that requires a financial asset or group of financial assets measured at amortized cost to be presented at the net amount expected to be collected. The new guidance also requires credit losses relating to these financial instruments as well as available-for-sale (AFS) securities to be recorded through the allowance for credit losses. Key changes as compared to prior accounting guidance are detailed below. Consistent with the modified retrospective method of adoption, the prior period has not been revised to conform to the new basis of accounting. For information on the prior accounting treatment and for descriptions of the Bank’s significant accounting policies, see “Item 8. Financial Statements and Supplementary Data – Note 1 – Summary of Significant Accounting Policies” in the Bank’s 2019 Form 10-K. Other changes to these policies as of September 30, 2020, are discussed in Note 2 – Recently Issued and Adopted Accounting Guidance. Interest-bearing Deposits, Securities Purchased under Agreements to Resell, and Federal Funds Sold. The Bank invests in interest-bearing deposits, securities purchased under agreements to resell, and Federal funds sold. These investments provide short-term liquidity and are carried at cost. Accrued interest receivable is recorded separately on the Statements of Condition. These investments are evaluated quarterly for expected credit losses. If applicable, an allowance for credit loss is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. The Bank treats securities purchased under agreements to resell as collateralized financing arrangements because they effectively represent short-term loans to counterparties that are considered by the Bank to be of investment quality, which are classified as assets in the Statements of Condition. Securities purchased under agreements to resell are held in safekeeping in the name of the Bank by third-party custodians approved by the Bank. In accordance with the terms of these loans, if the market value of the underlying securities decreases below the market value required as collateral, the counterparty must place an equivalent amount of additional securities as collateral or remit an equivalent amount of cash. Consequently, a credit loss would be recognized if there is a collateral shortfall which the Bank does not believe the counterparty will replenish in accordance with its contractual terms. The credit loss would be limited to the difference between the fair value of the collateral and the investment’s cost. The Bank invests in Federal funds sold with counterparties that are considered by the Bank to be of investment quality. See Note 3 – Investments for details on the allowance methodologies relating to interest-bearing deposits, securities purchased under agreements to resell, and Federal funds sold. Investment Securities. On a quarterly basis, the Bank evaluates its individual AFS investment securities in an unrealized loss position for impairment. A security is considered impaired when its fair value is less than its amortized cost basis. With respect to any debt security, a credit loss is defined as the amount by which the amortized cost basis exceeds the present value of the cash flows expected to be collected. If a credit loss exists but the entity does not intend to sell the debt security and it is not more likely than not that the entity will be required to sell the debt security before the anticipated recovery of its remaining amortized cost basis (the amortized cost basis less any current-period credit loss), an allowance for credit losses is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. The allowance is limited by the amount of the unrealized loss. Accrued interest receivable is recorded separately on the Statements of Condition. The allowance for credit losses excludes uncollectible accrued interest receivable, which is measured separately. If management intends to sell an impaired security classified as AFS, or more likely than not will be required to sell the security before expected recovery of its amortized cost basis, any allowance for credit losses is written off and the amortized cost basis is written down to the security’s fair value at the reporting date with any incremental impairment reported in earnings as net unrealized gain/(loss) on AFS securities. If management does not intend to sell an impaired security classified as AFS and it is not more likely than not that management will be required to sell the debt security, then the credit portion of the difference is recognized as an allowance for credit losses and any remaining difference between the security’s fair value and amortized cost is recorded to net unrealized gain/(loss) on AFS securities within other comprehensive income/(loss). Prior to January 1, 2020, credit losses were recorded as a direct write-down of the AFS security carrying value. For improvements in cash flows of AFS securities, interest income follows the recognition pattern pursuant to the impairment guidance in effect prior to January 1, 2020, and recoveries of amounts previously written off are recorded when received. AFS securities with a credit loss recognized pursuant to the impairment guidance in effect prior to January 1, 2020, continue to follow the prior accounting until maturity or disposition. For improvements in impaired AFS securities with an allowance for credit losses recognized after the adoption of the new guidance, the allowance for credit losses associated with recoveries may be derecognized up to its full amount. Effective January 1, 2020, the net non-credit-related other-than-temporary impairment (OTTI) gain/(loss) on AFS securities was reclassified to net unrealized gain/(loss) on AFS securities within other comprehensive income/(loss). Held-to-maturity (HTM) securities are carried at cost, adjusted for periodic principal repayments, amortization of premiums and accretion of discounts, and previous credit loss recognized in net income and Accumulated Other Comprehensive Income (AOCI) recorded prior to January 1, 2020. On a quarterly basis, the Bank evaluates its HTM investment securities for expected credit losses on a pool basis unless an individual assessment is deemed necessary because the securities do not possess similar risk characteristics. If necessary, an allowance for credit losses is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. Prior to January 1, 2020, credit losses were recorded as a direct write-down of the HTM security carrying value. Accrued interest receivable is recorded separately on the Statements of Condition. The allowance for credit losses excludes uncollectible accrued interest receivable, which is measured separately. For improvements in HTM securities impaired prior to January 1, 2020, interest income continues to follow the recognition pattern pursuant to the impairment guidance in effect prior to January 1, 2020, and recoveries of amounts previously written off are recorded when received. For improvements in impaired HTM securities with an allowance for credit losses recognized after the adoption of the new guidance, the allowance for credit losses associated with recoveries may be derecognized up to its full amount. See Note 3 – Investments for details on the allowance methodologies relating to AFS and HTM securities. Advances. The Bank reports advances (loans to members, former members or their successors or housing associates) either at amortized cost or at fair value when the fair value option is elected. Advances carried at amortized cost are reported net of premiums, discounts (including discounts related to the Affordable Housing Program), and hedging adjustments. Accrued interest receivable is recorded separately on the Statements of Condition. The advances carried at amortized cost are evaluated quarterly for expected credit losses. If deemed necessary, an allowance for credit losses is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. See Note 4 – Advances for details on the allowance methodologies relating to advances. Mortgage Loans Held for Portfolio. The Bank classifies mortgage loans as held for investment and, accordingly, reports them at their principal amount outstanding net of unamortized premiums, unamortized credit enhancement fees paid as a lump sum at the time loans are purchased, discounts, and unrealized gains and losses from loans initially classified as mortgage loan commitments. The Bank performs a quarterly assessment of its mortgage loans held for portfolio to estimate expected credit losses. An allowance for credit losses is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. The Bank measures expected credit losses on mortgage loans on a collective basis, pooling loans with similar risk characteristics. If a mortgage loan no longer shares risk characteristics with other loans, it is removed from the pool and evaluated for expected credit losses on an individual basis. When developing the allowance for credit losses, the Bank measures the estimated loss over the remaining life of a mortgage loan, which also considers how the Bank’s credit enhancements mitigate credit losses. The Bank includes estimates of expected recoveries within the allowance for credit losses. If a loan is purchased at a discount, the discount does not offset the allowance for credit losses. Accrued interest receivable is recorded separately on the Statements of Condition. The allowance excludes uncollectible accrued interest receivable, as the Bank writes off accrued interest receivable by reversing interest income if a mortgage loan is placed on nonaccrual status. The Bank does not purchase mortgage loans with credit deterioration present at the time of purchase. See Note 5 – Mortgage Loans Held for Portfolio for details on the allowance methodologies relating to mortgage loans. For more information related to the Bank’s accounting policies for the Mortgage Partnership Finance® (MPF®) Program, see “Item 8. Financial Statements and Supplementary Data – Note 1 – Summary of Significant Accounting Policies” in the Bank’s 2019 Form 10-K. (“Mortgage Partnership Finance,” “MPF,” and “MPF Xtra” are registered trademarks of the FHLBank of Chicago.)

Recently Issued and Adopted Acc

Recently Issued and Adopted Accounting Guidance	9 Months Ended
	Sep. 30, 2020
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recently Issued and Adopted Accounting Guidance	Note 2 — Recently Issued and Adopted Accounting Guidance The following table provides a summary of recently issued accounting standards that may have an effect on the financial statements. Recently Issued and Accounting Guidance, Not Yet Adopted Accounting Standards Update (ASU) Description Effective Date Effect on the Financial Statements or Other Significant Matters Facilitation of the Effects of Reference Rate Reform on Financial Reporting (ASU 2020-04) This guidance provides temporary optional guidance to ease the potential burden in accounting for reference rate reform. The new guidance provides optional expedients and exceptions for applying generally accepted accounting principles to transactions affected by reference rate reform if certain criteria are met. These transactions include: This guidance is effective immediately for the Bank, and the Bank may elect to apply the amendments prospectively through December 31, 2022. The Bank has assessed the guidance and plans to elect some of the optional expedients and exceptions provided; however, the effect on the Bank’s financial condition, results of operations, and cash flows has not yet been determined. Changes to the Disclosure Requirements for Defined Benefit Plans (ASU 2018-14) This guidance modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans to improve disclosure effectiveness. This guidance becomes effective for the Bank for the annual period ended December 31, 2020, and the annual periods thereafter. Early adoption is permitted. The adoption of this guidance will affect the Bank’s disclosures but will not have any effect on the Bank’s financial condition, results of operations, or cash flows. Recently Adopted Accounting Guidance ASU Description Effective Date Effect on the Financial Statements or Other Significant Matters Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15) This guidance aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2020. The guidance was adopted as of January 1, 2020. The adoption of this guidance did not have any effect on the Bank’s financial condition, results of operations, or cash flows. Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13) This guidance modifies the disclosure requirements for fair value measurements to improve disclosure effectiveness. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2020. The guidance was adopted as of January 1, 2020. The adoption of this guidance impacted the Bank’s disclosures but did not have any effect on the Bank’s financial condition, results of operations, or cash flows. Measurement of Credit Losses on Financial Instruments, as amended (ASU 2016-13) The guidance replaces the current incurred loss impairment model and requires entities to measure expected credit losses based on consideration of a broad range of relevant information, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The guidance also requires, among other things, credit losses relating to AFS securities to be recorded through an allowance for credit losses and expands disclosure requirements. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2020. This guidance was adopted using a modified retrospective basis as of January 1, 2020. Upon adoption, this guidance had no effect on advances or U.S. obligations and Government-Sponsored Enterprises (GSEs) investments. The adoption of this guidance had an immaterial effect on the remaining investment portfolio given the specific terms, issuer guarantees, and collateralized/securitized nature of these instruments, on mortgage loans, and on the Bank’s financial condition, results of operations, and cash flows.

Investments (Notes)

Investments (Notes)	3 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Available-for-Sale Securities	Investments The Bank makes short-term investments in interest-bearing deposits, securities purchased under agreements to resell, and Federal funds sold, and may make other investments in debt securities, which are classified as either trading, AFS, or HTM. Interest-Bearing Deposits, Securities Purchased under Agreements to Resell, and Federal Funds Sold. The Bank invests in interest-bearing deposits, securities purchased under agreements to resell, and Federal funds sold to provide short-term liquidity. These investments are generally transacted with counterparties that have received an investment grade credit rating of BBB or greater by a nationally recognized statistical rating organization (NRSRO). At September 30, 2020, none of these investments were with counterparties rated below BBB nor with unrated counterparties. These may differ from any internal ratings of the investments by the Bank, if applicable. Federal funds sold are unsecured loans that are generally transacted on an overnight term. Federal Housing Finance Agency (Finance Agency) regulations include a limit on the amount of unsecured credit the Bank may extend to a counterparty. At September 30, 2020, and December 31, 2019, all investments in interest-bearing deposits and Federal funds sold were repaid or expected to be repaid according to the contractual terms. No allowance for credit losses was recorded for these assets at September 30, 2020, and December 31, 2019. Carrying values of interest- bearing deposits and Federal funds sold exclude accrued interest receivable of de minimis amounts as of September 30, 2020, and $3 and a de minimis amount as of December 31, 2019, respectively. Based upon the collateral held as security and collateral maintenance provisions with its counterparties, the Bank determined that no allowance for credit losses was needed for its securities purchased under agreements to resell at September 30, 2020, and December 31, 2019. The carrying value of securities purchased under agreements excludes de minimis amounts of accrued interest receivable as of September 30, 2020, and December 31, 2019. Debt Securities The Bank invests in debt securities, which are classified as either trading, AFS, or HTM. Within these investments, the Bank is primarily subject to credit risk related to private-label residential mortgage-backed securities (PLRMBS) that are supported by underlying mortgage loans. The Bank is prohibited by Finance Agency regulations from purchasing certain higher risk securities, such as equity securities and debt instruments that are not investment quality at time of purchase. Trading Securities. The estimated fair value of trading securities as of September 30, 2020, and December 31, 2019, was as follows: September 30, 2020 December 31, 2019 U.S. obligations – Treasury securities $ 4,278 $ 1,762 MBS – Other U.S. obligations – Ginnie Mae 3 4 Total $ 4,281 $ 1,766 The net unrealized gain/(loss) on trading securities was $(19) and a de minimis amount for the three months ended September 30, 2020 and 2019, respectively. The net unrealized gain/(loss) on trading securities was $36 and $(1) for the nine months ended September 30, 2020 and 2019, respectively. These amounts represent the changes in the fair value of the securities during the reported periods. Available-for-Sale Securities. AFS securities by major security type as of September 30, 2020, and December 31, 2019, were as follows: September 30, 2020 Amortized Cost (1) Allowance for Credit Losses (2) Gross Gross Estimated Fair Value U.S. obligations – Treasury securities $ 3,797 $ — $ 4 $ — $ 3,801 MBS: GSEs – multifamily: Freddie Mac 851 — 3 (1) 853 Fannie Mae 7,894 — 19 (32) 7,881 Subtotal – GSEs – multifamily 8,745 — 22 (33) 8,734 PLRMBS: Prime 180 (2) 10 — 188 Alt-A 1,821 (22) 171 (22) 1,948 Subtotal PLRMBS 2,001 (24) 181 (22) 2,136 Total MBS 10,746 (24) 203 (55) 10,870 Total $ 14,543 $ (24) $ 207 $ (55) $ 14,671 December 31, 2019 Amortized Cost (1) OTTI Recognized in AOCI (2) Gross Unrealized Gains (3) Gross Estimated Fair Value U.S. obligations – Treasury securities $ 5,281 $ — $ 7 $ — $ 5,288 MBS: GSEs – multifamily: Freddie Mac 773 — 4 — 777 Fannie Mae 6,823 — 23 (13) 6,833 Subtotal – GSEs – multifamily 7,596 — 27 (13) 7,610 PLRMBS: Prime 213 — 17 — 230 Alt-A 2,116 (9) 260 — 2,367 Subtotal PLRMBS 2,329 (9) 277 — 2,597 Total MBS 9,925 (9) 304 (13) 10,207 Total $ 15,206 $ (9) $ 311 $ (13) $ 15,495 (1) Amortized cost includes unpaid principal balance, unamortized premiums and discounts, net charge-offs, and valuation adjustments for hedging activities, and excludes accrued interest receivable of $48 and $58 at September 30, 2020, and December 31, 2019, respectively. (2) Effective January 1, 2020, the Bank completes an analysis on a quarterly basis to determine whether to record an allowance for credit losses for expected credit losses on AFS securities. Prior to January 1, 2020, credit losses were recorded as a direct write-down to the AFS security carrying value. OTTI recognized in AOCI excludes subsequent unrealized gains/(losses) in fair value of previously other-than-temporarily impaired AFS securities at December 31, 2019, which is included in net non-credit-related OTTI on AFS securities. (3) Includes $277 in subsequent unrealized gains in fair value of previously other-than-temporarily impaired AFS securities at December 31, 2019. At September 30, 2020, the amortized cost of the Bank’s MBS classified as AFS included premiums of $67, discounts of $48, and credit-related OTTI of $506 for AFS securities with an OTTI recognized pursuant to the impairment guidance in effect prior to January 1, 2020. At December 31, 2019, the amortized cost of the Bank’s MBS classified as AFS included premiums of $65, discounts of $52, and credit-related OTTI of $574. The following tables summarize the AFS securities with unrealized losses as of September 30, 2020, and December 31, 2019. The unrealized losses are aggregated by major security type and the length of time that individual securities have been in a continuous unrealized loss position. At December 31, 2019, total unrealized losses in the following table will not agree to total gross unrealized losses in the table above. The unrealized losses in the following table as of December 31, 2019, also include non-credit-related OTTI losses recognized in AOCI. September 30, 2020 Less Than 12 Months 12 Months or More Total Estimated Unrealized Estimated Unrealized Estimated Unrealized MBS – GSEs – multifamily: Freddie Mac $ 321 $ 1 $ — $ — $ 321 $ 1 Fannie Mae 3,690 26 479 6 4,169 32 Subtotal MBS – GSEs – multifamily 4,011 27 479 6 4,490 33 PLRMBS: Prime 3 — 7 — 10 — Alt-A 206 7 154 15 360 22 Subtotal PLRMBS 209 7 161 15 370 22 Total $ 4,220 $ 34 $ 640 $ 21 $ 4,860 $ 55 December 31, 2019 Less Than 12 Months 12 Months or More Total Estimated Unrealized Estimated Unrealized Estimated Unrealized MBS – GSEs – multifamily: Freddie Mac $ 211 $ — $ — $ — $ 211 $ — Fannie Mae 2,433 9 623 4 3,056 13 Subtotal MBS – GSEs – multifamily 2,644 9 623 4 3,267 13 PLRMBS: Prime 4 — 8 — 12 — Alt-A 75 — 193 9 268 9 Subtotal PLRMBS 79 — 201 9 280 9 Total $ 2,723 $ 9 $ 824 $ 13 $ 3,547 $ 22 Redemption Terms. The amortized cost and estimated fair value of non-MBS investments by contractual maturity (based on contractual final principal payment) and of MBS as of September 30, 2020, and December 31, 2019, are shown below. Expected maturities of MBS will differ from contractual maturities because borrowers may have the right to call or prepay the underlying obligations with or without call or prepayment fees. September 30, 2020 Year of Contractual Maturity Amortized Estimated AFS securities other than MBS: Due in 1 year or less $ 2,924 $ 2,926 Due after 1 year through 5 years 873 875 Subtotal 3,797 3,801 MBS 10,746 10,870 Total $ 14,543 $ 14,671 December 31, 2019 Year of Contractual Maturity Amortized Estimated AFS securities other than MBS: Due in 1 year or less $ 2,309 $ 2,312 Due after 1 year through 5 years 2,972 2,976 Subtotal 5,281 5,288 MBS 9,925 10,207 Total $ 15,206 $ 15,495 Held-to-Maturity Securities. The Bank classifies the following securities as HTM because the Bank has the positive intent and ability to hold these securities to maturity: September 30, 2020 Amortized Cost (1) Gross Unrecognized Holding Gains (3) Gross Unrecognized Holding Losses (3) Estimated MBS – Other U.S. obligations – single-family: Ginnie Mae $ 319 $ 9 $ — $ 328 MBS – GSEs – single-family: Freddie Mac 654 14 — 668 Fannie Mae 1,373 24 (1) 1,396 Subtotal MBS – GSEs – single-family 2,027 38 (1) 2,064 MBS – GSEs – multifamily: Freddie Mac 2,110 1 (3) 2,108 Fannie Mae 946 — (2) 944 Subtotal MBS – GSEs – multifamily 3,056 1 (5) 3,052 Subtotal MBS – GSEs 5,083 39 (6) 5,116 PLRMBS: Prime 203 — (6) 197 Alt-A 113 4 (3) 114 Subtotal PLRMBS 316 4 (9) 311 Total $ 5,718 $ 52 $ (15) $ 5,755 December 31, 2019 Amortized Cost (1) OTTI Recognized in AOCI (2) Carrying Gross Unrecognized Holding Gains (3) Gross Unrecognized Holding Losses (3) Estimated MBS – Other U.S. obligations – single-family: Ginnie Mae $ 470 $ — $ 470 $ 5 $ — $ 475 MBS – GSEs – single-family: Freddie Mac 1,063 — 1,063 8 (1) 1,070 Fannie Mae 1,844 — 1,844 20 (1) 1,863 Subtotal MBS – GSEs – single-family 2,907 — 2,907 28 (2) 2,933 MBS – GSEs – multifamily: Freddie Mac 2,625 — 2,625 — (9) 2,616 Fannie Mae 1,159 — 1,159 — (2) 1,157 Subtotal MBS – GSEs – multifamily 3,784 — 3,784 — (11) 3,773 Subtotal MBS – GSEs 6,691 — 6,691 28 (13) 6,706 PLRMBS: Prime 243 — 243 1 (4) 240 Alt-A 142 (1) 141 6 (2) 145 Subtotal PLRMBS 385 (1) 384 7 (6) 385 Total $ 7,546 $ (1) $ 7,545 $ 40 $ (19) $ 7,566 (1) Amortized cost includes unpaid principal balance, unamortized premiums and discounts, and net charge offs, and excludes accrued interest receivable of $5 and $12 at September 30, 2020, and December 31, 2019, respectively. (2) With the adoption of new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020, the OTTI approach was replaced with an evaluation for an allowance for credit loss; however, OTTI remains for those securities that had credit impairment prior to the adoption date. (3) Gross unrecognized gains/(losses) represent the difference between estimated fair value and net carrying value. Expected maturities of MBS classified as HTM will differ from contractual maturities because borrowers may have the right to call or prepay the underlying obligations with or without call or prepayment fees. At September 30, 2020, the amortized cost of the Bank’s MBS classified as HTM included premiums of $5, discounts of $7, and credit-related OTTI of $6 for HTM securities with an OTTI recognized pursuant to the impairment guidance in effect prior to January 1, 2020. At December 31, 2019, the amortized cost of the Bank’s MBS classified as HTM included premiums of $8, discounts of $11, and credit-related OTTI of $7. Allowance for Credit Losses on AFS and HTM Securities. The Bank adopted new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020. For additional information, see Note 2 – Recently Issued and Adopted Accounting Guidance. For information on the prior methodology for evaluating credit losses, see “Item 8. Financial Statements and Supplementary Data – Note 1 – Summary of Significant Accounting Policies” in the Bank’s 2019 Form 10-K. The following table presents a rollforward of the allowance for credit losses on investment securities associated with PLRMBS classified as AFS for the three and nine months ended September 30, 2020. The Bank recorded no allowance for credit losses associated with HTM securities during the nine months ended September 30, 2020. Under the previous accounting methodology of security impairment, the Bank recognized credit-related net OTTI loss of $2 and $8 during the three and nine months ended September 30, 2019, respectively. Three Months Ended Nine Months Ended September 30, 2020 September 30, 2020 Balance, beginning of the period $ 29 $ — (Charge-offs)/recoveries (1) (2) Provision for/(reversal of) credit losses (4) 26 Balance, end of the period $ 24 $ 24 To evaluate investment securities for credit loss at September 30, 2020, the Bank employed the following methodologies, based on the type of security. AFS and HTM Securities (Excluding PLRMBS) – The Bank’s AFS and HTM securities are principally U.S. obligations and MBS issued by Ginnie Mae, Freddie Mac, and Fannie Mae that are backed by single-family or multifamily mortgage loans. The Bank only purchases securities considered investment quality. Excluding PLRMBS investments, at September 30, 2020, approximately 100% of AFS securities and HTM securities, based on amortized cost, were rated A, or above, by an NRSRO, based on the lowest long-term credit rating for each security. These may differ from any internal ratings of the securities by the Bank, if applicable. At September 30, 2020, certain of the Bank’s AFS securities were in an unrealized loss position. These losses are considered temporary as the Bank expects to recover the entire amortized cost basis on these AFS investment securities and neither intends to sell these securities nor considers it more likely than not that it will be required to sell these securities before its anticipated recovery of each security's remaining amortized cost basis. Further, the Bank has not experienced any payment defaults on the instruments. In addition, substantially all of these securities carry an implicit or explicit government guarantee. As a result, no allowance for credit losses was recorded on these AFS securities at September 30, 2020. As of September 30, 2020, the Bank had not established an allowance for credit loss on any of its HTM securities because the securities: (i) were all highly rated or had short remaining terms to maturity, (ii) had not experienced, nor did the Bank expect, any payment default on the instruments, and (iii) in the case of GSE or other U.S. obligations, carry an implicit or explicit government guarantee such that the Bank considers the risk of nonpayment to be zero. Private-Label Residential Mortgage-Backed Securities – The Bank also holds investments in PLRMBS. The Bank has not purchased any PLRMBS since the first quarter of 2008. However, many of these securities have subsequently experienced significant credit deterioration. As of September 30, 2020, approximately 6% of PLRMBS (AFS and HTM combined, based on amortized cost) were rated A, or above, by an NRSRO; and the remaining securities were either rated less than A, or were unrated. To determine whether an allowance for credit loss is necessary on these securities, the Bank uses cash flow analyses. For certain PLRMBS where underlying collateral data is not available, alternative procedures as determined by the Bank are used to assess these securities for credit loss measurement. At each quarter end, the Bank compares the present value of the cash flows expected to be collected on its PLRMBS, using the effective interest rate, to the amortized cost basis of the securities to determine whether a credit loss exists. The expected credit losses are measured using: • the remaining payment terms for the security; • prepayment speeds based on underlying loan-level borrower and loan characteristics; • expected default rates based on underlying loan-level borrower and loan characteristics; • expected housing price changes; • expected interest rate assumptions; and • loss severities on the collateral supporting each unique PLRMBS based on underlying loan-level borrower and loan characteristics. The projected cash flows are based on a number of assumptions and expectations, and the results of these models can vary significantly with changes in assumptions and expectations. The scenario of cash flows determined reflects management’s expectations and includes a base case housing price forecast for near- and long-term horizons. For all the PLRMBS in its AFS and HTM portfolios, the Bank does not intend to sell any security and it is not more likely than not that the Bank will be required to sell any security before its anticipated recovery of the remaining amortized cost basis. For securities with an OTTI recognized pursuant to the impairment guidance in effect prior to January 1, 2020, as of September 30, 2020 (securities for which the Bank determined that it does not expect to recover the entire amortized cost basis), the following table presents a summary of the significant inputs used in measuring the fair value of PLRMBS classified as Level 3 as of September 30, 2020, and the related current credit enhancement for the Bank. September 30, 2020 Significant Inputs for Other-Than-Temporarily Impaired PLRMBS Current Prepayment Rates Default Rates Loss Severities Credit Enhancement Collateral Type at Origination Weighted Average % (1) Weighted Average % (1) Weighted Average % (1) Weighted Average % (1) Prime 10.4 17.3 20.2 22.5 Alt-A 13.3 20.5 40.9 2.8 Total 13.3 20.5 40.8 2.9 (1) Weighted average percentage is based on unpaid principal balance. Credit enhancement is defined as the percentage of subordinated tranches, excess spread, and over-collateralization, if any, in a security structure that will generally absorb losses before the Bank will experience a loss on the security. The calculated averages represent the dollar-weighted averages of all the PLRMBS investments in each category shown. The classification is based on the model used to run the estimated cash flows for the CUSIP, which may not necessarily be the same as the classification at the time of origination. The following table presents the credit-related OTTI, which is recognized in earnings, for the three and nine months ended September 30, 2020 and 2019. Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Balance, beginning of the period $ 990 $ 1,050 $ 1,021 $ 1,077 Additional charges on securities for which OTTI was previously recognized (1) — 2 — 8 Securities matured during the period (2) — (3) — (5) Accretion of yield adjustments resulting from improvement of expected cash flows that are recognized over the remaining life of the securities (3) (14) (15) (45) (46) Balance, end of the period $ 976 $ 1,034 $ 976 $ 1,034 (1) For the three and nine months ended September 30, 2019, “securities for which OTTI was previously recognized” represents all securities that were also other-than-temporarily impaired prior to January 1, 2020. (2) Represents reductions related to securities that, having reached final maturity during the period, are therefore are no longer held by the Bank at the end of the period. (3) The total net accretion/(amortization) associated with PLRMBS that were other-than-temporarily impaired prior to January 1, 2020, (amount recognized in interest income) totaled $17 and $21 for the three months ended September 30, 2020 and 2019, respectively. The total net accretion/(amortization) associated with PLRMBS that were other-than-temporarily impaired prior to January 1, 2020, (amount recognized in interest income) totaled $54 and $58 for the nine months ended September 30, 2020 and 2019, respectively. In general, the Bank elects to transfer any PLRMBS that incurred a credit loss during the applicable period from the Bank’s HTM portfolio to its AFS portfolio at their fair values. The Bank recognized a credit loss on these HTM PLRMBS, which the Bank believes is evidence of a significant decline in the credit quality of the underlying collateral. The decline in the credit quality of the underlying collateral is the basis for the transfers to the AFS portfolio. These transfers allow the Bank the option to sell these securities prior to maturity in view of changes in interest rates, changes in prepayment risk, or other factors, while recognizing the Bank’s intent to hold these securities for an indefinite period of time. The Bank transferred PLRMBS from its HTM portfolio to its AFS portfolio with an amortized cost and fair value of $1 during the nine months ended September 30, 2020. The Bank did not transfer any PLRMBS from its HTM portfolio to its AFS portfolio during the three months ended September 30, 2020, nor during the three and nine months ended September 30, 2019. For the Bank’s PLRMBS, the Bank experienced declines in fair value in March 2020 as a result of disruptions in the financial markets combined with illiquidity in the PLRMBS market and decreased expectations of the performance of loan collateral underlying these securities, which caused these assets to be valued at discounts to their amortized cost. As a result of these factors and the adoption of new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020, the Bank recorded a provision for credit losses on its PLRMBS portfolio of $39 in the first quarter of 2020. Subsequent improvement in the Bank’s PLRMBS fair values during the three months ended September 30, 2020, resulted in the Bank’s recognition of a reversal of credit losses totaling $4 on its PLRMBS portfolio. During the nine months ended September 30, 2020, the Bank recorded a provision for credit losses on its PLRMBS portfolio classified as AFS of $26.

Advances

Advances	9 Months Ended
	Sep. 30, 2020
Federal Home Loan Banks [Abstract]
Advances	Note 4 — Advances The Bank offers a wide range of fixed and adjustable rate advance products with different maturities, interest rates, payment characteristics, and option features. Fixed rate advances generally have maturities ranging from one day to 30 years. Adjustable rate advances generally have maturities ranging from less than 30 days to 10 years, with the interest rates resetting periodically at a fixed spread to a specified index. Redemption Terms. The Bank had advances outstanding, excluding overdrawn demand deposit accounts, at interest rates ranging from 0.00% to 8.57% at September 30, 2020, and 1.15% to 8.57% at December 31, 2019, as summarized below. September 30, 2020 December 31, 2019 Redemption Term Amount Outstanding (1) Weighted Amount Outstanding (1) Weighted Overdrawn demand and overnight deposit accounts $ 1 0.01 % $ — — % Within 1 year 13,115 1.29 32,351 1.91 After 1 year through 2 years 12,031 1.65 22,380 2.15 After 2 years through 3 years 2,764 2.16 4,847 2.08 After 3 years through 4 years 3,546 2.48 2,909 2.97 After 4 years through 5 years 3,988 1.38 1,461 2.32 After 5 years 1,445 2.20 1,140 2.96 Total par value 36,890 1.63 % 65,088 2.08 % Valuation adjustments for hedging activities 639 203 Valuation adjustments under fair value option 165 83 Unamortized discounts (1) — Total $ 37,693 $ 65,374 (1) Carrying amounts exclude accrued interest receivable of $7 and $39 at September 30, 2020, and December 31, 2019, respectively. Many of the Bank’s advances are prepayable at the borrower’s option. However, when advances are prepaid, the borrower is generally charged a prepayment fee intended to make the Bank financially indifferent to the prepayment. In addition, for certain advances with full or partial prepayment symmetry, the Bank may charge the borrower a prepayment fee or pay the borrower a prepayment credit depending on certain circumstances, such as movements in interest rates, when the advance is prepaid. The Bank had advances with full prepayment symmetry outstanding totaling $21,195 at September 30, 2020, and $14,059 at December 31, 2019. The Bank had advances with partial prepayment symmetry outstanding totaling $2,738 at September 30, 2020, and $3,513 at December 31, 2019. Some advances may be repaid on pertinent call dates without prepayment fees (callable advances). The Bank had callable advances outstanding totaling $2,670 at September 30, 2020, and $14,024 at December 31, 2019. The Bank had putable advances totaling $220 at September 30, 2020, and $20 at December 31, 2019. At the Bank’s discretion, the Bank may terminate these advances on predetermined exercise dates and offer replacement funding at prevailing market rates, subject to certain conditions. The Bank would typically exercise such termination rights when interest rates increase relative to contractual rates. The following table summarizes advances at September 30, 2020, and December 31, 2019, by the earlier of the year of redemption term or next call date for callable advances and by the earlier of the year of redemption term or next put date for putable advances. Earlier of Redemption Earlier of Redemption September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Overdrawn demand and overnight deposit accounts $ 1 $ — $ 1 $ — Within 1 year 15,685 39,075 13,335 32,371 After 1 year through 2 years 9,481 15,731 12,031 22,380 After 2 years through 3 years 2,764 4,800 2,764 4,847 After 3 years through 4 years 3,546 2,895 3,546 2,909 After 4 years through 5 years 3,968 1,447 3,988 1,461 After 5 years 1,445 1,140 1,225 1,120 Total par value $ 36,890 $ 65,088 $ 36,890 $ 65,088 Concentration Risk. The following tables present the concentration in advances to the top five borrowers and their affiliates at September 30, 2020 and 2019. The tables also present the interest income from these advances before the impact of interest rate exchange agreements associated with these advances for the three and nine months ended September 30, 2020 and 2019. September 30, 2020 Three Months Ended Nine Months Ended Name of Borrower Advances Percentage of Interest (1) Percentage of Interest (1) Percentage of First Republic Bank $ 13,510 37 % $ 62 35 % $ 201 28 % MUFG Union Bank, National Association 4,925 13 36 21 141 19 CIT Bank, National Association 2,550 7 4 2 20 3 First Technology Federal Credit Union 1,975 5 11 6 34 5 Luther Burbank Savings 962 3 5 3 16 2 Subtotal 23,922 65 118 67 412 57 Others 12,968 35 57 33 310 43 Total par value $ 36,890 100 % $ 175 100 % $ 722 100 % September 30, 2019 Three Months Ended Nine Months Ended Name of Borrower Advances Percentage of Interest (1) Percentage of Interest (1) Percentage of MUFG Union Bank, National Association $ 14,100 22 % $ 92 24 % $ 287 22 % First Republic Bank 11,200 18 62 16 175 13 Wells Fargo & Company Wells Fargo Financial National Bank West 8,000 13 49 13 150 12 Wells Fargo Bank, National Association (2) 41 — 1 — 2 — Subtotal Wells Fargo & Company 8,041 13 50 13 152 12 Bank of the West 5,556 9 41 10 124 9 JPMorgan Chase Bank, National Association (2) 5,056 8 33 9 144 11 Subtotal 43,953 70 278 72 882 67 Others 18,486 30 110 28 427 33 Total par value $ 62,439 100 % $ 388 100 % $ 1,309 100 % (1) Interest income amounts exclude the interest effect of interest rate exchange agreements with derivative counterparties; as a result, the total interest income amounts will not agree to the Statements of Income. The amount of interest income from advances can vary depending on the amount outstanding, terms to maturity, interest rates, and repricing characteristics. (2) Nonmember institution. The Bank held a security interest in collateral from each of the top five advances borrowers and their affiliates sufficient to support their respective advances outstanding, and the Bank does not expect to incur any credit losses on these advances. Credit Risk Exposure and Security Terms. The Bank manages its credit exposure related to advances through an integrated approach that generally provides for a credit limit to be established for each borrower, includes an ongoing review of each borrower’s financial condition, and is coupled with conservative collateral and lending policies to limit the risk of loss while taking into account borrowers’ needs for a reliable funding source. In addition, the Bank lends to eligible borrowers in accordance with federal law and Finance Agency regulations. Specifically, the Bank is required to obtain sufficient collateral to fully secure credit products up to the member’s total credit limit. Borrowers may pledge the following eligible assets to secure advances: • one-to-four-family first lien residential mortgage loans; • securities issued, insured, or guaranteed by the U.S. government or any of its agencies, including without limitation MBS backed by Fannie Mae, Freddie Mac, or Ginnie Mae; • cash or deposits in the Bank; • certain other real estate-related collateral, such as multifamily loans, commercial real estate loans, and second lien residential mortgage loans or home equity loans; and • small business, small farm, and small agribusiness loans that are fully secured by collateral (such as real estate, equipment and vehicles, accounts receivable, and inventory) from members that are community financial institutions. At September 30, 2020, and December 31, 2019, none of the Bank’s credit products were past due or on nonaccrual status. There were no troubled debt restructurings related to credit products during the nine months ended September 30, 2020, or during 2019. Based on the collateral pledged as security for advances, the Bank’s credit analyses of borrowers’ financial condition, repayment history on advances, and the Bank’s credit extension and collateral policies as of September 30, 2020, the Bank expects to collect all amounts due according to the contractual terms. Therefore, no allowance for losses on advances was deemed necessary by the Bank as of September 30, 2020, and December 31, 2019. For more information on the credit risk exposure and security terms of advances, see “Item 8. Financial Statements and Supplementary Data – Note 10 – Allowance for Credit Losses” in the Bank’s 2019 Form 10-K. Interest Rate Payment Terms. Interest rate payment terms for advances at September 30, 2020, and December 31, 2019, are detailed below: September 30, 2020 December 31, 2019 Par value of advances: Fixed rate: Due within 1 year $ 12,343 $ 15,327 Due after 1 year 20,975 21,337 Total fixed rate 33,318 36,664 Adjustable rate: Due within 1 year 772 17,024 Due after 1 year 2,800 11,400 Total adjustable rate 3,572 28,424 Total par value $ 36,890 $ 65,088 The Bank did not have any advances with embedded features that met the requirements to separate the embedded feature from the host contract and designate the embedded feature as a stand-alone derivative at September 30, 2020, or December 31, 2019. The Bank has generally elected to account for certain advances with embedded features under the fair value option, and these advances are carried at fair value on the Statements of Condition. For more information, see Note 11 – Derivatives and Hedging Activities and Note 12 – Fair Value. Prepayment Fees, Net. The Bank charges borrowers prepayment fees or pays borrowers prepayment credits when the principal on certain advances is paid prior to original maturity. The Bank records prepayment fees net of any associated fair value adjustments related to prepaid advances that were hedged. The net amount of prepayment fees is reflected as advances interest income in the Statements of Income for the three and nine months ended September 30, 2020 and 2019, as follows: Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Prepayment fees received $ 38 $ — $ 77 $ — Fair value adjustments (35) — (62) 1 Net $ 3 $ — $ 15 $ 1 Advance principal prepaid $ 5,018 $ 775 $ 21,804 $ 3,506

Mortgage Loans Held for Portfol

Mortgage Loans Held for Portfolio	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Mortgage Loans Held for Portfolio	Mortgage Loans Held for Portfolio The following table presents information as of September 30, 2020, and December 31, 2019, on mortgage loans, all of which are secured by one- to four-unit residential properties and single-unit second homes. September 30, 2020 December 31, 2019 Fixed rate medium-term mortgage loans $ 33 $ 27 Fixed rate long-term mortgage loans 2,338 3,199 Subtotal 2,371 3,226 Unamortized premiums 42 91 Unamortized discounts (2) (3) Mortgage loans held for portfolio (1) 2,411 3,314 Less: Allowance for credit losses (7) — Total mortgage loans held for portfolio, net $ 2,404 $ 3,314 (1) Excludes accrued interest receivable of $13 and $19 at September 30, 2020, and December 31, 2019, respectively. Medium-term loans have original contractual terms of 15 years or less, and long-term loans have contractual terms of more than 15 years. Payment Status of Mortgage Loans. Payment status is the key credit quality indicator for conventional mortgage loans and allows the Bank to monitor the migration of past due loans. Past due loans are those where the borrower has failed to make timely payments of principal and/or interest in accordance with the terms of the loan. Other delinquency statistics include nonaccrual loans and loans in process of foreclosure. The following tables present the payment status for mortgage loans and other delinquency statistics for Bank’s mortgage loans at September 30, 2020, and December 31, 2019. September 30, 2020 Origination Year Payment Status <2016 2016 to 2020 Amortized Cost (1) 30 – 59 days delinquent $ 19 $ 2 $ 21 60 – 89 days delinquent 16 1 17 90 days or more delinquent 116 10 126 Total past due 151 13 164 Total current loans 2,051 196 2,247 Total MPF (2) $ 2,202 $ 209 $ 2,411 In process of foreclosure, included above (3) $ 1 Nonaccrual loans (2)(4) $ 126 Serious delinquencies as a percentage of total mortgage loans outstanding (2)(5) 5.23 % December 31, 2019 Payment Status Recorded Investment (1) 30 – 59 days delinquent $ 15 60 – 89 days delinquent 2 90 days or more delinquent 7 Total past due 24 Total current loans 3,310 Total MPF $ 3,334 In process of foreclosure, included above (3) $ — Nonaccrual loans $ 7 Serious delinquencies as a percentage of total mortgage loans outstanding (5) 0.22 % (1) With the adoption of new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020, payment status of mortgage loans is disclosed at amortized cost. The recorded investment at December 31, 2019, in a loan is the unpaid principal balance of the loan, adjusted for accrued interest, net deferred loan fees or costs, unamortized premiums or discounts, and direct write-downs. The recorded investment is not net of any valuation allowance. The amortized cost at September 30, 2020, in a loan is the unpaid principal balance of the loan, adjusted for net deferred loan fees or costs, unamortized premiums or discounts, and direct write-downs. (2) At September 30, 2020, unpaid principal balances of conventional mortgage loans held in portfolio that were in a forbearance plan as a result of the COVID-19 pandemic totaled $143. Of that total, $12 were current, $6 were 30 to 59 days past due, $13 were 60 to 90 days past due, and $112 were greater than 90 days past due and in nonaccrual payment status. The conventional mortgage loans in forbearance represent 6% of the Bank’s mortgage loans held for portfolio at September 30, 2020. (3) Includes loans for which the servicer has reported a decision to foreclose or to pursue a similar alternative, such as deed-in-lieu. Loans in process of foreclosure are included in past due or current loans depending on their delinquency status. (4) At September 30, 2020, $125 of these mortgage loans on nonaccrual status did not have an associated allowance for credit losses. (5) Represents loans that are 90 days or more past due or in the process of foreclosure as a percentage of the recorded investment of total mortgage loans outstanding. Section 4013 of the CARES Act provides temporary relief from the accounting and reporting requirements for TDR for certain loan modifications related to the COVID-19 pandemic. Specifically, the CARES Act provides that a qualifying financial institution may elect to suspend (i) the requirements under U.S. GAAP for certain loan modifications that would otherwise be categorized as a TDR, and (ii) any determination that such loan modifications would be considered a TDR, including the related impairment for accounting purposes. Section 4013 of the CARES Act applies to any modification related to an economic hardship as a result of the COVID-19 pandemic, including an interest rate modification, a repayment plan, or any similar arrangement that defers or delays payment of principal or interest, that occurs during the period beginning on March 1, 2020 and ending on the earlier of December 31, 2020, or the date that is 60 days after the declaration of the national emergency related to the COVID-19 pandemic ends for a loan that was not more than 30 days past due as of December 31, 2019. The Bank has elected to suspend TDR accounting for eligible modifications under Section 4013 of the CARES Act. Under the MPF Program, the Bank may purchase from members, for its own portfolio, conventional conforming fixed rate residential mortgage loans under the MPF Original product and mortgage loans insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs from its participating members under the MPF Government Product. Participating members originate or purchase mortgage loans, credit-enhance them and sell them to the Bank, and generally retain the servicing of the loans. The participating members may grant a forbearance period to borrowers who have requested forbearance based on COVID-19 related difficulties regardless of the status of the loan at the time of the request. The Bank continues to apply its accounting policy for past due loans and charge-offs to loans during the forbearance period. The accrual status for loans under forbearance will be driven by the past due status of the loan. Allowance for Credit Losses on MPF Loans. MPF loans are evaluated collectively for expected credit losses when similar risk characteristics exist. MPF loans that do not share risk characteristics with other pools are evaluated for expected credit losses on an individual basis, factoring in the credit enhancement structure at the master commitment level. The Bank determines its allowances for credit losses on MPF loans through analyses that include consideration of various loan portfolio and collateral-related characteristics, such as past performance, current conditions, and reasonable and supportable forecasts of expected economic conditions. The Bank uses models that employ a variety of methods, such as projected cash flows, to estimate expected credit losses over the life of the loans. These models rely on a number of inputs, such as current and forecasted property values and interest rates as well as historical borrower behavior experience. At September 30, 2020, the Bank’s reasonable and supportable forecast of housing prices expects, on average, for prices to appreciate 1% over a one-year forecast horizon before reverting to long-term housing price appreciation rates of 4% over a three-year forecast horizon based on historical averages. The Bank also incorporates associated credit enhancements, if any, to determine its estimate of expected credit losses. Certain MPF loans may be evaluated for credit losses by the Bank using the practical expedient for collateral-dependent assets. A mortgage loan is considered collateral-dependent if repayment is expected to be provided by the sale of the underlying property, that is, if it is considered likely that the borrower will default. The Bank may estimate the fair value of this collateral by applying an appropriate loss severity rate or using third-party estimates or property valuation models. The expected credit loss of a collateral-dependent mortgage loan is equal to the difference between the amortized cost of the loan and the estimated fair value of the collateral, less estimated selling costs. The Bank will either reserve for these estimated losses or record a direct charge-off of the loan balance, if certain triggering criteria are met. Expected recoveries of prior charge-offs, if any, are included in the allowance for credit loss. The following table presents a rollforward of the allowance for credit losses on the mortgage loan portfolio for the three and nine months ended September 30, 2020. The Bank recorded a de minimis allowance for credit losses on the mortgage loan portfolio for the three and nine months ended September 30, 2019. Three Months Ended Nine Months Ended September 30, 2020 September 30, 2020 Balance, beginning of the period $ 5 $ — Adjustment for cumulative effect of accounting change — 3 Provision for/(reversal of) credit losses 2 4 Balance, end of the period $ 7 $ 7 See “Item 8. Financial Statements and Supplementary Data – Note 1 – Summary of Significant Accounting Policies” and “Item 8. Financial Statements and Supplementary Data – Note 10 – Allowance for Credit Losses” in the Bank’s 2019 Form 10-K for information on the prior methodology for evaluating credit losses, as well as a discussion on classes of financing receivables, placing them on nonaccrual status, and charging them off when necessary. For more information related to the Bank’s accounting policies for collateral-dependent loans, see “Item 8. Financial Statements and Supplementary Data – Note 1 – Summary of Significant Accounting Policies” in the Bank’s 2019 Form 10-K.

Deposits

Deposits	9 Months Ended
	Sep. 30, 2020
Deposits [Abstract]
Deposits	Deposits The Bank maintains demand deposit accounts that are directly related to the extension of credit to members and offers short-term deposit programs to members and qualifying nonmembers. In addition, a member that services mortgage loans may deposit in the Bank funds collected in connection with the mortgage loans, pending disbursement of these funds to the owners of the mortgage loans. The Bank classifies these types of deposits as non-interest-bearing deposits. Deposits classified as demand, overnight, and other pay interest based on a daily interest rate. Term deposits pay interest based on a fixed rate determined at the issuance of the deposit. Deposits and interest rate payment terms for deposits as of September 30, 2020, and December 31, 2019, were as follows: September 30, 2020 December 31, 2019 Amount Weighted Amount Weighted Interest-bearing deposits: Adjustable rate $ 816 0.01 % $ 427 1.30 % Fixed rate 20 0.01 — — Total interest-bearing deposits 836 427 Non-interest-bearing deposits 170 110 Total $ 1,006 $ 537

Consolidated Obligations

Consolidated Obligations	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Consolidated Obligations	Note 7 — Consolidated Obligations Consolidated obligations, consisting of consolidated obligation bonds and discount notes, are jointly issued by the Federal Home Loan Banks (FHLBanks) through the Office of Finance, which serves as the FHLBanks’ agent. As provided by the Federal Home Loan Bank Act of 1932, as amended (FHLBank Act) or by regulations governing the operations of the FHLBanks, all FHLBanks have joint and several liability for all FHLBank consolidated obligations. For a discussion of the joint and several liability regulation, see “Item 8. Financial Statements and Supplementary Data – Note 20 – Commitments and Contingencies” in the Bank’s 2019 Form 10-K. In connection with each issuance of consolidated obligations, each FHLBank specifies the type, term, and amount of debt it requests to have issued on its behalf. The Office of Finance tracks the amount of debt issued on behalf of each FHLBank. In addition, the Bank separately tracks and records as a liability its specific portion of the consolidated obligations issued and is the primary obligor for that portion of the consolidated obligations issued. The Finance Agency and the U.S. Secretary of the Treasury have oversight over the issuance of FHLBank debt through the Office of Finance. Redemption Terms. The following is a summary of the Bank’s participation in consolidated obligation bonds at September 30, 2020, and December 31, 2019. September 30, 2020 December 31, 2019 Contractual Maturity Amount Weighted Amount Weighted Within 1 year $ 50,491 0.19 % $ 53,549 1.68 % After 1 year through 2 years 1,798 0.93 13,853 1.67 After 2 years through 3 years 506 1.38 770 1.93 After 3 years through 4 years 357 1.13 135 2.74 After 4 years through 5 years 360 1.46 937 2.08 After 5 years 1,386 2.60 2,126 2.94 Total par value 54,898 0.30 % 71,370 1.73 % Unamortized premiums 8 1 Unamortized discounts (5) (10) Valuation adjustments for hedging activities 18 9 Fair value option valuation adjustments 2 2 Total $ 54,921 $ 71,372 The Bank’s participation in consolidated obligation bonds outstanding includes callable bonds of $2,325 at September 30, 2020, and $6,345 at December 31, 2019. When a callable bond for which the Bank is the primary obligor is issued, the Bank may simultaneously enter into an interest rate swap (in which the Bank pays a variable rate and receives a fixed rate) with a call feature that mirrors the call option embedded in the bond (a sold callable swap). The Bank had notional amounts of interest rate exchange agreements hedging callable bonds of $65 at September 30, 2020, and $2,085 at December 31, 2019. The combined sold callable swaps and callable bonds enable the Bank to meet its funding needs at costs not otherwise directly attainable solely through the issuance of non-callable debt, while effectively converting the Bank’s net payment to an adjustable rate. The Bank’s participation in consolidated obligation bonds at September 30, 2020, and December 31, 2019, was as follows: September 30, 2020 December 31, 2019 Par value of consolidated obligation bonds: Non-callable $ 52,573 $ 65,025 Callable 2,325 6,345 Total par value $ 54,898 $ 71,370 The following is a summary of the Bank’s participation in consolidated obligation bonds outstanding at September 30, 2020, and December 31, 2019, by the earlier of the year of contractual maturity or next call date. Earlier of Contractual September 30, 2020 December 31, 2019 Within 1 year $ 52,366 $ 58,239 After 1 year through 2 years 1,953 12,768 After 2 years through 3 years 451 195 After 3 years through 4 years 77 70 After 4 years through 5 years — 47 After 5 years 51 51 Total par value $ 54,898 $ 71,370 Consolidated obligation discount notes are consolidated obligations issued to raise short-term funds. These notes are issued at less than their face value and redeemed at par value when they mature. The Bank’s participation in consolidated obligation discount notes, all of which are due within one year, was as follows: September 30, 2020 December 31, 2019 Amount Weighted Average Interest Rate (1) Amount Weighted Average Interest Rate (1) Par value $ 13,306 0.19 % $ 27,447 1.61 % Unamortized discounts (6) (71) Total $ 13,300 $ 27,376 (1) Represents yield to maturity excluding concession fees. Interest Rate Payment Terms. Interest rate payment terms for consolidated obligations at September 30, 2020, and December 31, 2019, are detailed in the following table. For information on the general terms and types of consolidated obligations outstanding, see “Item 8. Financial Statements and Supplementary Data – Note 12 – Consolidated Obligations” in the Bank’s 2019 Form 10-K. September 30, 2020 December 31, 2019 Par value of consolidated obligations: Bonds: Fixed rate $ 5,590 $ 10,993 Adjustable rate 49,263 60,117 Step-up 45 60 Step-down — 100 Range bonds — 100 Total bonds, par value 54,898 71,370 Discount notes, par value 13,306 27,447 Total consolidated obligations, par value $ 68,204 $ 98,817 The Bank did not have any bonds with embedded features that met the requirements to separate the embedded feature from the host contract and designate the embedded feature as a stand-alone derivative at September 30, 2020, or December 31, 2019. The Bank has generally elected to account for certain bonds with embedded features under the fair value option, and these bonds are carried at fair value on the Statements of Condition. For more information, see Note 11 – Derivatives and Hedging Activities and Note 12 – Fair Value.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income/(Loss)	Accumulated Other Comprehensive Income/(Loss) The following table summarizes the changes in AOCI for the three months ended September 30, 2020 and 2019: Net Unrealized Gain/(Loss) on AFS Securities Net Non-Credit-Related OTTI Loss on AFS Securities Net Non-Credit-Related OTTI Loss on HTM Securities Pension and Postretirement Benefits Total Balance, June 30, 2019 $ 15 $ 304 $ (2) $ (17) $ 300 Other comprehensive income/(loss) before reclassifications: Non-credit-related OTTI loss (1) — (1) Net change in fair value (17) (15) (32) Net current period other comprehensive income/(loss) (17) (16) — — (33) Balance, September 30, 2019 $ (2) $ 288 $ (2) $ (17) $ 267 Balance, June 30, 2020 $ (21) $ — $ — $ (14) $ (35) Other comprehensive income/(loss) before reclassifications: Net change in pension and postretirement benefits (1) (1) Net change in fair value 172 — 172 Net current period other comprehensive income/(loss) 172 — — (1) 171 Balance, September 30, 2020 $ 151 $ — $ — $ (15) $ 136 The following table summarizes the changes in AOCI for the nine months ended September 30, 2020 and 2019: Net Unrealized Gain/(Loss) on AFS Securities Net Non-Credit-Related OTTI Loss on AFS Securities Net Non-Credit-Related OTTI Loss on HTM Securities Pension and Postretirement Benefits Total Balance, December 31, 2018 $ (32) $ 287 $ (3) $ (17) $ 235 Other comprehensive income/(loss) before reclassifications: Non-credit-related OTTI loss (3) — (3) Net change in fair value 30 1 31 Accretion of non-credit loss 1 1 Reclassification from other comprehensive income/(loss) to net income/(loss): Non-credit-related OTTI to credit-related OTTI 3 — 3 Net current period other comprehensive income/(loss) 30 1 1 — 32 Balance, September 30, 2019 $ (2) $ 288 $ (2) $ (17) $ 267 Balance, December 31, 2019 $ 21 $ 268 $ (1) $ (14) $ 274 Other comprehensive income/(loss) before reclassifications: Net change in pension and postretirement benefits (1) (1) Net change in fair value (138) — (138) Accretion of non-credit loss 1 1 Net current period other comprehensive income/(loss) (138) — 1 (1) (138) Adoption of ASU 2016-13, as amended (1) 268 (268) — Balance, September 30, 2020 $ 151 $ — $ — $ (15) $ 136

Capital

Capital	9 Months Ended
	Sep. 30, 2020
Banking Regulation, Total Capital [Abstract]
Capital	Note 9 — Capital Capital Requirements. Under the Housing Act, the Director of the Finance Agency is responsible for setting the risk-based capital standards for the FHLBanks. The FHLBank Act and regulations governing the operations of the FHLBanks require that the Bank’s minimum capital stock requirement for shareholders must be sufficient to enable the Bank to meet its regulatory requirements for total capital, leverage capital, and risk-based capital. The Bank must maintain: (i) total regulatory capital in an amount equal to at least 4% of its total assets, (ii) leverage capital in an amount equal to at least 5% of its total assets, and (iii) permanent capital in an amount that is greater than or equal to its risk-based capital requirement. Beginning in February 2020, the Finance Agency issued guidance that augmented existing statutory and regulatory capital requirements to require each FHLBank to maintain a ratio of at least two percent of capital stock to total assets in order to help preserve the cooperative structure incentives that encourage members to remain fully engaged in the oversight of their investment in the FHLBank. The Finance Agency will consider the proportion of capital stock to assets, measured on a daily average basis at monthend, when assessing each FHLBank’s capital management practices. As of September 30, 2020, the Bank was in compliance with this capital guidance. Because the Bank issues only Class B stock, regulatory capital and permanent capital for the Bank are both composed of retained earnings and Class B stock, including mandatorily redeemable capital stock (which is classified as a liability for financial reporting purposes). Regulatory capital and permanent capital do not include AOCI. Leverage capital is defined as the sum of permanent capital, weighted by a 1.5 multiplier, plus non-permanent capital. The risk-based capital requirement is equal to the sum of the Bank’s credit risk, market risk, and operations risk capital requirements, all of which are calculated in accordance with the rules and regulations of the Finance Agency. The Finance Agency may require an FHLBank to maintain a greater amount of permanent capital than is required by the risk-based capital requirement as defined. As of September 30, 2020, and December 31, 2019, the Bank was in compliance with these capital rules and requirements as shown in the following table. September 30, 2020 December 31, 2019 Required Actual Required Actual Risk-based capital $ 1,403 $ 6,086 $ 1,519 $ 6,605 Total regulatory capital $ 3,035 $ 6,086 $ 4,274 $ 6,605 Total regulatory capital ratio 4.00 % 8.02 % 4.00 % 6.18 % Leverage capital $ 3,793 $ 9,129 $ 5,342 $ 9,908 Leverage ratio 5.00 % 12.03 % 5.00 % 9.27 % Mandatorily Redeemable Capital Stock. The Bank had mandatorily redeemable capital stock totaling $2 outstanding to three institutions at September 30, 2020, and $138 outstanding to three institutions at December 31, 2019. The change in mandatorily redeemable capital stock for three and nine months ended September 30, 2020 and 2019, was as follows: Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Balance at the beginning of the period $ 83 $ 138 $ 138 $ 227 Reclassified from/(to) capital during the period — 4 3 4 Repurchase of excess mandatorily redeemable capital stock (81) (4) (139) (93) Balance at the end of the period $ 2 $ 138 $ 2 $ 138 Cash dividends on mandatorily redeemable capital stock were recorded as interest expense in the amount of $1 and $3 for the three months ended September 30, 2020 and 2019, respectively, and in the amount of $5 and $11 for the nine months ended September 30, 2020 and 2019, respectively. The Bank’s mandatorily redeemable capital stock is discussed more fully in “Item 8. Financial Statements and Supplementary Data – Note 15 – Capital” in the Bank’s 2019 Form 10-K. The following table presents mandatorily redeemable capital stock amounts by contractual redemption period at September 30, 2020, and December 31, 2019. Contractual Redemption Period September 30, 2020 December 31, 2019 Within 1 year $ — $ 135 Past contractual redemption date because of remaining activity (1) 2 3 Total $ 2 $ 138 (1) Represents mandatorily redeemable capital stock that is past the end of the contractual redemption period because of outstanding activity. Excess Stock Repurchase, Retained Earnings, and Dividend Framework. By Finance Agency regulation, dividends may be paid only out of current net earnings or previously retained earnings. As required by the Finance Agency, the Bank’s Excess Stock Repurchase, Retained Earnings, and Dividend Framework (Framework) summarizes the Bank’s capital management principles and objectives, as well as its policies and practices, with respect to retained earnings, dividend payments, and the repurchase of excess capital stock. The Bank may be restricted from paying dividends if the Bank is not in compliance with any of its minimum capital requirements or if payment would cause the Bank to fail to meet any of its minimum capital requirements. In addition, the Bank may not pay dividends if any principal or interest due on any consolidated obligations has not been paid in full or is not expected to be paid in full, or, under certain circumstances, if the Bank fails to satisfy certain liquidity requirements under applicable Finance Agency regulations. The Bank’s Board of Directors reviews the Framework at least annually and may amend the Framework from time to time. The Framework includes a dividend philosophy to endeavor to pay a quarterly dividend at an annualized rate between 5% and 7%. The decision to declare any dividend and the dividend rate are at the discretion of the Bank’s Board of Directors, which may choose to follow the dividend philosophy as guidance in the dividend declaration. The Board may also revise or eliminate the dividend policy in the future. The Bank’s historical dividend rates and the dividend philosophy are not indicative of future dividend declarations. The Bank’s Risk Management Policy limits the payment of dividends if the ratio of the Bank’s estimated market value of total capital to par value of capital stock falls below certain levels. If this ratio at the end of any quarter is less than 100% but greater than or equal to 70%, any dividend would be limited to an annualized rate no greater than the daily average of the Federal funds effective rate for the applicable quarter (subject to certain conditions), and if this ratio is less than 70%, the Bank would be restricted from paying a dividend. The ratio of the Bank’s estimated market value of total capital to par value of capital stock was 260% as of September 30, 2020. In addition, the Bank monitors the condition of its PLRMBS portfolio, the ratio of the Bank’s estimated market value of total capital to par value of capital stock, its overall financial performance and retained earnings, developments in the mortgage and credit markets, and other relevant information as the basis for determining the payment of dividends and the repurchase of excess capital stock in future quarters. Retained Earnings – The Bank’s Framework assesses the level and adequacy of retained earnings and establishes amounts to be retained in restricted retained earnings, which are not made available in the current dividend period, and maintains an amount of total retained earnings at least equal to its required retained earnings as described in the Framework. As determined using the Bank’s methodology, the required level of total retained earnings had ranged from $2,400 to $2,500 during all of 2019 and continuing through September 2020. On September 30, 2020, the methodology was further revised and resulted in a required level of retained earnings of $2,900. The Bank satisfies its retained earnings requirement with both restricted retained earnings (i.e., amounts related to the Joint Capital Enhancement (JCE) Agreement) and unrestricted retained earnings. The Bank’s retained earnings requirement may be changed at any time. The Board of Directors periodically reviews the retained earnings methodology and analysis to determine whether any adjustments are appropriate. The Bank’s restricted retained earnings totaled $761 and $713 at September 30, 2020, and December 31, 2019, respectively. The Bank’s unrestricted retained earnings totaled $2,858 and $2,754 at September 30, 2020, and December 31, 2019, respectively. For more information on restricted retained earnings and the Bank’s Framework, see “Item 8. Financial Statements and Supplementary Data – Note 15 – Capital” in the Bank’s 2019 Form 10-K. Partial Recovery of Prior Capital Distribution to Financing Corporation – The Competitive Equality Banking Act of 1987 was enacted in August 1987, to, among other things, provide for the recapitalization of the Federal Savings and Loan Insurance Corporation through a newly-chartered entity, the Financing Corporation. Capital distributions from the FHLBanks provided the capitalization of the Financing Corporation, in exchange for Financing Corporation nonvoting capital stock. Capital distributions made by the FHLBanks in 1987, 1988, and 1989, aggregated to $680. Upon passage of the Financial Institutions Reform, Recovery, and Enforcement Act of 1989, the Bank’s previous investment in the Financing Corporation’s capital stock was determined to be non-redeemable; the Bank charged off its prior capital distributions to the Financing Corporation directly against retained earnings. On October 2, 2019, the Financing Corporation commenced the process of dissolution and determined that excess funds aggregating to $200 were available for distribution to its stockholders, the FHLBanks. The Bank’s partial recovery, which was determined based on its share of the $680 originally contributed, approximated $40. The Financing Corporation dissolved on July 6, 2020. The Bank received these funds in the second quarter of 2020 and treated receipt of these funds as a return of the Bank’s investment in Financing Corporation capital stock, and therefore as a partial recovery of the prior capital distributions made by the Bank to the Financing Corporation in 1987, 1988, and 1989. These funds were credited to unrestricted retained earnings. Dividend Payments – Finance Agency rules state that FHLBanks may declare and pay dividends only from previously retained earnings or current net earnings, and may not declare or pay dividends based on projected or anticipated earnings. There is no requirement that the Board of Directors declare and pay any dividend. A decision by the Board of Directors to declare or not declare a dividend is a discretionary matter and is subject to the requirements and restrictions of the FHLBank Act and applicable requirements under the regulations governing the operations of the FHLBanks. In addition, Finance Agency rules do not permit the Bank to pay dividends in the form of capital stock if its excess capital stock exceeds 1% of its total assets. Excess capital stock is defined as the aggregate of the capital stock held by each shareholder in excess of its minimum capital stock requirement, as established by the Bank’s capital plan. Excess capital stock totaled $197, or 0.26% of total assets as of September 30, 2020. Excess capital stock totaled $197, or 0.18% of total assets as of December 31, 2019. In the third quarter of 2020, the Bank paid dividends at an annualized rate of 5.00%, totaling $37, including $36 in dividends on capital stock and $1 in dividends on mandatorily redeemable capital stock. In the third quarter of 2019, the Bank paid dividends at an annualized rate of 7.00%, totaling $56, including $53 in dividends on capital stock and $3 in dividends on mandatorily redeemable capital stock. In the first nine months of 2020, the Bank paid dividends at an annualized rate of 5.68%, totaling $131, including $126 in dividends on capital stock and $5 in dividends on mandatorily redeemable capital stock. In the first nine months of 2019, the Bank paid dividends at an annualized rate of 7.00%, totaling $166, including $155 in dividends on capital stock and $11 in dividends on mandatorily redeemable capital stock. For the periods referenced above, the Bank paid dividends in cash. Dividends on capital stock are recognized as dividends on the Statements of Capital Accounts, and dividends on mandatorily redeemable capital stock are recognized as interest expense on the Statements of Income. On October 29, 2020, the Bank’s Board of Directors declared a quarterly cash dividend on the capital stock outstanding during the third quarter of 2020 at an annualized rate of 5.00%, totaling $33, including $33 in dividends on capital stock and a de minimis amount in dividends on mandatorily redeemable capital stock. The Bank recorded the dividend on October 29, 2020. The Bank expects to pay the dividend on November 12, 2020. Dividends on mandatorily redeemable capital stock will be recognized as interest expense in the fourth quarter of 2020. Excess Capital Stock – The Bank’s capital plan provides that the Bank may repurchase some or all of a shareholder’s excess capital stock, including any excess mandatorily redeemable capital stock, at the Bank’s discretion, subject to certain statutory and regulatory requirements. The Bank may also repurchase all of a member’s excess capital stock at a member’s request, at the Bank’s discretion, subject to certain statutory and regulatory requirements. A shareholder’s excess capital stock is defined as any capital stock holdings in excess of the shareholder’s minimum capital stock requirement, as established by the Bank’s capital plan. The Bank’s practice is to repurchase the surplus capital stock of all members and the excess capital stock of all former members on a daily schedule. Surplus capital stock is defined as any stock holdings in excess of 115% of a member’s minimum stock requirement. The Bank calculates the amount of stock to be repurchased each business day based on the shareholder’s capital stock outstanding after all stock transactions are completed for the day, ensuring that each member and former member would continue to meet its minimum capital stock requirement after the repurchase. The Bank may change this practice at any time. The Bank repurchased $314 and $210 in excess capital stock during the third quarter of 2020 and 2019, respectively, and $1,452 and $977 in excess capital stock during the first nine months of 2020 and 2019, respectively. The Bank is required to redeem any mandatorily redeemable capital stock that is in excess of a former member’s minimum stock requirement on or after the expiration of the five-year redemption date. During the third quarter of 2020 and 2019, the Bank redeemed a de minimis amount in mandatorily redeemable capital stock, for which the five-year redemption period had expired, at its $100 par value. The stock was redeemed on the scheduled redemption dates or, for stock that was not excess stock on its scheduled redemption date because of outstanding activity with the Bank, on the first available repurchase date after the stock was no longer required to support outstanding activity with the Bank. Concentration. The following table presents the concentration in capital stock held by institutions whose capital stock ownership represented 10% or more of the Bank’s outstanding capital stock, including mandatorily redeemable capital stock, as of September 30, 2020, or December 31, 2019. September 30, 2020 December 31, 2019 Name of Institution Capital Stock Percentage Capital Stock Percentage First Republic Bank $ 419 17 % $ 368 12 % MUFG Union Bank, National Association 153 6 394 12 Subtotal 572 23 762 24 Others 1,895 77 2,376 76 Total $ 2,467 100 % $ 3,138 100 %

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Segment Information	Segment Information The Bank uses an analysis of financial results based on the financial components and adjusted net interest income of two operating segments, the advances-related business and the mortgage-related business, as well as other financial information, to review and assess financial performance and determine financial management strategies related to the operations of these two business segments. For purposes of segment reporting, adjusted net interest income includes income and expense associated with net settlements from economic hedges that are recorded in “Net gain/(loss) on derivatives and hedging activities” in other income, excludes interest income and expense associated with ineffectiveness from fair value hedges that are recorded in the same line as the earnings effect of the hedged item, and excludes interest expense that is recorded in “Mandatorily redeemable capital stock.” Other key financial information, such as assessments, is not included in the segment reporting analysis, but is incorporated into the Bank’s overall assessment of financial performance. For more information on these operating segments, see “Item 8. Financial Statements and Supplementary Data – Note 17 – Segment Information” in the Bank’s 2019 Form 10-K. The following table presents the Bank’s adjusted net interest income by operating segment and reconciles total adjusted net interest income to income before the AHP assessment for the three and nine months ended September 30, 2020 and 2019. Advances- Mortgage- Related Business (1) Adjusted Amortization of Basis Adjustments and (Gain)/Loss on Fair Value Hedges (2) Income/(Expense) on Economic Hedges (3) Interest Expense on Mandatorily Redeemable Capital Stock (4) Net Other Other Income/(Loss) Three months ended: September 30, 2020 $ 50 $ 53 $ 103 $ (13) $ (34) $ 1 $ 149 $ 70 $ 40 $ 179 September 30, 2019 72 60 132 20 (3) 3 112 3 47 68 Nine months ended: September 30, 2020 $ 182 $ 140 $ 322 $ 61 $ (52) $ 5 $ 308 $ 79 $ 119 $ 268 September 30, 2019 237 186 423 54 (8) 11 366 11 138 239 (1) The mortgage-related business includes total accretion or amortization associated with other-than-temporarily impaired PLRMBS, which are recognized in interest income, totaled $17 and $21 for the three months ended September 30, 2020 and 2019; and totaled $54 and $58 for the nine months ended September 30, 2020 and 2019, respectively. The mortgage-related business includes a provision for/(reversal of) credit losses of $(2) and $30 for the three and nine months ended September 30, 2020, respectively. The mortgage-related business does not include credit-related OTTI losses of $2 and $8 for the three and nine months ended September 30, 2019, respectively. (2) Represents amortization of amounts deferred for adjusted net interest income purposes only and changes in fair value of the derivative hedging instrument and the hedged item attributable to the hedged risk for designated fair value hedges recorded in net interest income. (3) The Bank includes income and expense associated with net settlements from economic hedges in adjusted net interest income in its analysis of financial performance for its two operating segments. For financial reporting purposes, the Bank does not include these amounts in net interest income in the Statements of Income, but instead records them in other income in “Net gain/(loss) on derivatives and hedging activities.” (4) The Bank excludes interest expense on mandatorily redeemable capital stock from adjusted net interest income in its analysis of financial performance for its two operating segments. The following table presents total assets by operating segment at September 30, 2020, and December 31, 2019. Advances- Mortgage- Total September 30, 2020 $ 56,829 $ 19,041 $ 75,870 December 31, 2019 85,709 21,133 106,842

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities General . The Bank may enter into interest rate swaps (including callable, putable, and basis swaps); and cap and floor agreements (collectively, interest rate exchange agreements or derivatives). Most of the Bank’s interest rate exchange agreements are executed in conjunction with the origination of advances or the issuance of consolidated obligations to create variable rate structures. The interest rate exchange agreements are generally executed at the same time the advances and consolidated obligations are transacted and generally have the same maturity dates as the related hedged instrument. The Bank transacts most of its derivatives with large banks and major broker-dealers. Some of these banks and broker-dealers or their affiliates buy, sell, and distribute consolidated obligations. Derivatives may be either uncleared or cleared. In an uncleared derivative transaction, the Bank’s counterparty is the executing bank or broker-dealer. In a cleared derivative transaction, the Bank may execute the transaction either directly with the executing bank or broker-dealer or on a swap execution facility, but in either case, the Bank’s counterparty is a derivatives clearing organization (clearinghouse) once the derivative transaction has been accepted for clearing. The Bank is not a derivatives dealer and does not trade derivatives for short-term profit. Additional uses of interest rate exchange agreements include: (i) offsetting embedded features in assets and liabilities, (ii) hedging anticipated issuance of debt, (iii) matching against consolidated obligation discount notes to create the equivalent of callable or non-callable fixed rate debt, (iv) modifying the repricing frequency of assets and liabilities, (v) matching against certain advances and consolidated obligations for which the Bank elected the fair value option, and (vi) exactly offsetting other derivatives cleared at a clearinghouse. The Bank’s use of interest rate exchange agreements results in one of the following classifications: (i) a fair value hedge of an underlying financial instrument or (ii) an economic hedge of assets, liabilities, or other derivatives. For more information related to the Bank’s interest rate exchange agreement instruments and hedging activities, see “Item 8. Financial Statements and Supplementary Data – Note 18 – Derivatives and Hedging Activities” in the Bank’s 2019 Form 10-K. For more information related to the Bank’s accounting policies for derivatives, see “Item 8. Financial Statements and Supplementary Data – Note 1 – Summary of Significant Accounting Policies” in the Bank’s 2019 Form 10-K. The following table summarizes the notional amount and fair value of derivative instruments, including the effect of netting adjustments and cash collateral as of September 30, 2020, and December 31, 2019. For purposes of this disclosure, the derivative values include the fair value of derivatives and related accrued interest. September 30, 2020 December 31, 2019 Notional Derivative Derivative Notional Derivative Derivative Derivatives designated as hedging instruments: Interest rate swaps $ 38,608 $ 48 $ 303 $ 39,622 $ 31 $ 370 Total 38,608 48 303 39,622 31 370 Derivatives not designated as hedging instruments: Interest rate swaps 40,937 10 27 60,424 13 14 Interest rate caps and floors 980 — — 980 — — Mortgage delivery commitments 6 — — 46 — — Total 41,923 10 27 61,450 13 14 Total derivatives before netting and collateral adjustments $ 80,531 58 330 $ 101,072 44 384 Netting adjustments and cash collateral (1) (2) (329) (11) (384) Total derivative assets and total derivative liabilities $ 56 $ 1 $ 33 $ — (1) Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral, including accrued interest, held or placed with the same clearing agents and/or counterparty. Cash collateral posted, including accrued interest, was $335 and $378 at September 30, 2020, and December 31, 2019, respectively. Cash collateral received, including accrued interest, was $8 and $5 at September 30, 2020, and December 31, 2019, respectively. The following tables present, by type of hedged item, the gains and losses on fair value hedging relationships and the impact of those derivatives on the Bank’s Statements of Income for the three and nine months ended September 30, 2020 and 2019. Three Months Ended September 30, 2020 Interest Income/(Expense) Advances AFS Securities Consolidated Obligation Bonds Total interest income/(expense) presented in the Statements of Income $ 88 $ 67 $ (47) Gain/(loss) on fair value hedging relationships Derivatives (1) $ 22 $ 54 $ (1) Hedged items (112) (112) 8 Net gain/(loss) on fair value hedging relationships $ (90) $ (58) $ 7 Three Months Ended September 30, 2019 Interest Income/(Expense) Advances AFS Securities Consolidated Obligation Bonds Total interest income/(expense) presented in the Statements of Income $ 389 $ 100 $ (409) Gain/(loss) on fair value hedging relationships Derivatives (1) $ (36) $ (224) $ 2 Hedged items 37 209 (4) Net gain/(loss) on fair value hedging relationships $ 1 $ (15) $ (2) Nine Months Ended September 30, 2020 Interest Income/(Expense) Advances AFS Securities Consolidated Obligation Bonds Total interest income/(expense) presented in the Statements of Income $ 509 $ 179 $ (405) Gain/(loss) on fair value hedging relationships Derivatives (1) $ (715) $ (995) $ 27 Hedged items 486 803 (9) Net gain/(loss) on fair value hedging relationships $ (229) $ (192) $ 18 Nine Months Ended September 30, 2019 Interest Income/(Expense) Advances AFS Securities Consolidated Obligation Bonds Total interest income/(expense) presented in the Statements of Income $ 1,343 $ 261 $ (1,306) Gain/(loss) on fair value hedging relationships Derivatives (1) $ (292) $ (594) $ 43 Hedged items 325 552 (61) Net gain/(loss) on fair value hedging relationships $ 33 $ (42) $ (18) (1) Includes net interest settlements. The following tables present the cumulative basis adjustments on hedged items designated as fair value hedges and the related amortized cost of the hedged items as of September 30, 2020, and December 31, 2019. September 30, 2020 December 31, 2019 Advances AFS Securities Consolidated Obligation Bonds Advances AFS Securities Consolidated Obligation Bonds Amortized cost of hedged asset/(liability) (1) $ 25,815 $ 12,541 $ (2,541) $ 22,900 $ 12,877 $ (4,840) Fair value hedging basis adjustments: Active hedging relationships included in amortized cost $ 619 $ 318 $ (19) $ 204 $ 431 $ (9) Discontinued hedging relationships included in amortized cost 20 916 — — — — Total amount of fair value hedging basis adjustments $ 639 $ 1,234 $ (19) $ 204 $ 431 $ (9) (1) Includes only the portion of amortized cost representing the hedged items in fair value hedging relationships. The following table presents the components of net gain/(loss) on derivatives and hedging activities as presented in the Statements of Income for the three and nine months ended September 30, 2020 and 2019. Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Derivatives not designated as hedging instruments Gain/(Loss) Gain/(Loss) Gain/(Loss) Gain/(Loss) Economic hedges: Interest rate swaps $ 39 $ (17) $ (107) $ (102) Interest rate caps and floors — (1) — (2) Net settlements (34) (3) (52) (8) Mortgage delivery commitments — 1 3 3 Net gain/(loss) on derivatives and hedging activities $ 5 $ (20) $ (156) $ (109) Credit Risk. The Bank is subject to credit risk from potential nonperformance by counterparties to the interest rate exchange agreements. All of the Bank’s agreements governing uncleared derivative transactions contain master netting provisions to help mitigate the credit risk exposure to each counterparty. The Bank manages counterparty credit risk through credit analyses and collateral requirements and by following the requirements of the Bank’s risk management policies, credit guidelines, and Finance Agency and other regulations. The Bank also requires credit support agreements on all uncleared derivatives. For cleared derivatives, the clearinghouse is the Bank’s counterparty. The requirement that the Bank post initial and variation margin through a clearing agent, to the clearinghouse, exposes the Bank to institutional credit risk in the event that the clearing agent or the clearinghouse fails to meet its obligations. The use of cleared derivatives, however, mitigates the Bank’s overall credit risk exposure because a central counterparty is substituted for individual counterparties. Variation margin and initial margin are posted for changes in the value and risk profile of cleared derivatives. The Bank has analyzed the enforceability of offsetting rights applicable to its cleared derivative transactions and determined that the exercise of those offsetting rights by a non-defaulting party under these transactions should be upheld under applicable bankruptcy law and Commodity Futures Trading Commission rules in the event of a clearinghouse or clearing agent insolvency and under applicable clearinghouse rules upon a non-insolvency-based event of default of the clearinghouse or clearing agent. Based on this analysis, the Bank presents a net derivative receivable or payable for all of its transactions through a particular clearing agent with a particular clearinghouse. Based on the Bank’s credit analyses and the collateral requirements, the Bank does not expect to incur any credit losses on its derivative transactions. The Bank’s agreements for uncleared derivative transactions contain provisions that link the Bank’s credit rating from Moody’s Investors Service and S&P Global Ratings to various rights and obligations. Certain of these derivative agreements provide that, if the Bank’s long-term debt rating falls below a specified rating (ranging from A3/A- to Baa3/BBB-), the Bank’s counterparty would have the right, but not the obligation, to terminate all of its outstanding derivative transactions with the Bank; the Bank’s agreements with its clearing agents for cleared derivative transactions have similar provisions with respect to the debt rating of FHLBank System consolidated bonds. If this occurs, the Bank may choose to enter into replacement hedges, either by transferring the existing transactions to another counterparty or entering into new replacement transactions, based on prevailing market rates. The aggregate fair value of all uncleared derivative instruments with credit risk-related contingent features that were in a net derivative liability position (before cash collateral and related accrued interest) at September 30, 2020, was $290, for which the Bank had posted cash collateral of $329 in the ordinary course of business. The Bank may present derivative instruments, related cash collateral received or pledged, and associated accrued interest by clearing agent or by counterparty when the netting requirements have been met. The following tables present separately the fair value of derivative assets and derivative liabilities that have met the netting requirements, including the related collateral received from or pledged to counterparties as of September 30, 2020, and December 31, 2019. September 30, 2020 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Total Derivative Assets and Total Derivative Liabilities Noncash Collateral Not Offset That Net Amount Derivative Assets Uncleared $ 33 $ 7 $ 40 $ — $ 40 Cleared 25 (9) 16 (386) 402 Total $ 56 $ 442 Derivative Liabilities Uncleared $ 315 $ (314) $ 1 $ — $ 1 Cleared 15 (15) — — — Total $ 1 $ 1 December 31, 2019 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Total Derivative Assets and Total Derivative Liabilities Noncash Collateral Not Offset That Net Amount Derivative Assets Uncleared $ 34 $ (16) $ 18 $ — $ 18 Cleared 10 5 15 (381) 396 Total $ 33 $ 414 Derivative Liabilities Uncleared $ 382 $ (382) $ — $ — $ — Cleared 2 (2) — — — Total $ — $ —

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value	Fair Value The following fair value amounts have been determined by the Bank using available market information and the Bank’s best judgment of appropriate valuation methods. These estimates are based on pertinent information available to the Bank at September 30, 2020, and December 31, 2019. Although the Bank uses its best judgment in estimating the fair value of these financial instruments, there are inherent limitations in any estimation technique or valuation methodology. For example, because an active secondary market does not exist for a portion of the Bank’s financial instruments, in certain cases fair values cannot be precisely quantified or verified and may change as economic and market factors and evaluation of those factors change. The Bank continues to refine its valuation methodologies as markets and products develop and the pricing for certain products becomes more or less transparent. While the Bank believes that its valuation methodologies are appropriate and consistent with those of other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a materially different estimate of fair value as of the reporting date. U.S. GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (i.e., an exit price). Therefore, the fair values are not necessarily indicative of the amounts that would be realized in current market transactions, although they do reflect the Bank’s judgment as to how a market participant would estimate the fair values. The fair value summary table does not represent an estimate of the overall market value of the Bank as a going concern, which would take into account future business opportunities and the net profitability of total assets and liabilities. The following tables present the net carrying value or carrying value, as applicable, the estimated fair value, and the fair value hierarchy level of the Bank’s financial instruments at September 30, 2020, and December 31, 2019. The Bank records trading securities, AFS securities, derivative assets, derivative liabilities, certain advances, certain consolidated obligations, and certain other assets at fair value on a recurring basis, and on occasion certain mortgage loans held for portfolio and certain other assets at fair value on a nonrecurring basis. The Bank records all other financial assets and liabilities at amortized cost. Refer to the following tables for further details about the financial assets and liabilities held at fair value on either a recurring or non-recurring basis. September 30, 2020 Net Carrying Estimated Fair Value Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets Cash and due from banks $ 175 $ 175 $ 175 $ — $ — $ — Interest-bearing deposits 1,478 1,478 1,478 — — — Securities purchased under agreements to resell 6,750 6,750 — 6,750 — — Federal funds sold 2,323 2,323 — 2,323 — — Trading securities 4,281 4,281 — 4,281 — — AFS securities 14,671 14,671 — 12,535 2,136 — HTM securities 5,718 5,755 — 5,444 311 — Advances 37,693 37,887 — 37,887 — — Mortgage loans held for portfolio, net of allowance for credit losses on mortgage loans 2,404 2,418 — 2,418 — — Accrued interest receivable 100 100 — 100 — — Derivative assets, net (1) 56 56 — 58 — (2) Other assets (2) 20 20 20 — — — Liabilities Deposits 1,006 1,006 — 1,006 — — Consolidated obligations: Bonds 54,921 54,984 — 54,984 — — Discount notes 13,300 13,302 — 13,302 — — Total consolidated obligations 68,221 68,286 — 68,286 — — Mandatorily redeemable capital stock 2 2 2 — — — Accrued interest payable 31 31 — 31 — — Derivative liabilities, net (1) 1 1 — 330 — (329) Other Standby letters of credit 33 33 — 33 — — December 31, 2019 Carrying Estimated Fair Value Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets Cash and due from banks $ 118 $ 118 $ 118 $ — $ — $ — Interest-bearing deposits 2,269 2,269 2,269 — — — Securities purchased under agreements to resell 7,000 7,000 — 7,000 — — Federal funds sold 3,562 3,562 — 3,562 — — Trading securities 1,766 1,766 — 1,766 — — AFS securities 15,495 15,495 — 12,898 2,597 — HTM securities 7,545 7,566 — 7,181 385 — Advances 65,374 65,492 — 65,492 — — Mortgage loans held for portfolio, net of allowance for credit losses on mortgage loans 3,314 3,332 — 3,332 — — Accrued interest receivable 139 139 — 139 — — Derivative assets, net (1) 33 33 — 44 — (11) Other assets (2) 19 19 19 — — — Liabilities Deposits 537 537 — 537 — — Consolidated obligations: Bonds 71,372 71,386 — 71,386 — — Discount notes 27,376 27,378 — 27,378 — — Total consolidated obligations 98,748 98,764 — 98,764 — — Mandatorily redeemable capital stock 138 138 138 — — — Accrued interest payable 164 164 — 164 — — Derivative liabilities, net (1) — — — 384 — (384) Other Standby letters of credit 32 32 — 32 — — (1) 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. (2) Represents publicly traded mutual funds held in a grantor trust. Fair Value Hierarchy. The fair value hierarchy is used to prioritize the fair value methodologies and valuation techniques as well as the inputs to the valuation techniques used to measure fair value for assets and liabilities carried at fair value on the Statements of Condition. The inputs are evaluated and an overall level for the fair value measurement is determined. This overall level is an indication of market observability of the fair value measurement for the asset or liability. The fair value hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). An entity must disclose the level within the fair value hierarchy in which the measurements are classified for all financial assets and liabilities measured on a recurring or non-recurring basis. The application of the fair value hierarchy to the Bank’s financial assets and financial liabilities that are carried at fair value either on a recurring or non-recurring basis is as follows: • Level 1 – Quoted prices (unadjusted) for identical assets or liabilities in an active market that the reporting entity can access on the measurement date. An active market for the asset or liability is a market in which the transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. • Level 2 – Inputs other than quoted prices within Level 1 that are observable inputs for the asset or liability, either directly or indirectly. If the asset or liability has a specified (contractual) term, a Level 2 input must be observable for substantially the full term of the asset or liability. Level 2 inputs include the following: (1) quoted prices for similar assets or liabilities in active markets; (2) quoted prices for identical or similar assets or liabilities in markets that are not active; (3) inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates and yield curves that are observable at commonly quoted intervals, and implied volatilities); and (4) inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3 – Unobservable inputs for the asset or liability. A financial instrument’s categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The following assets and liabilities, including those for which the Bank has elected the fair value option, are carried at fair value on the Statements of Condition as of September 30, 2020: • Trading securities • AFS securities • Certain advances • Derivative assets and liabilities • Certain consolidated obligation bonds • Certain other assets For instruments carried at fair value, the Bank reviews the fair value hierarchy classifications on a quarterly basis. Changes in the observability of the valuation inputs may result in a reclassification of certain assets or liabilities. For the periods presented, the Bank did not have any reclassifications for transfers in or out of level 3 of the fair value hierarchy. Summary of Valuation Methodologies and Primary Inputs. For information related to the valuation methodologies and primary inputs used to develop the measurement of fair value for assets and liabilities that are measured at fair value on a recurring or nonrecurring basis in the Statements of Condition, see “Item 8. Financial Statements and Supplementary Data – Note 19 – Fair Value” in the Bank’s 2019 Form 10-K. There have been no significant changes in these valuation methodologies and primary inputs during the nine months ended September 30, 2020. Subjectivity of Estimates Related to Fair Values of Financial Instruments. Estimates of the fair value of financial assets and liabilities using the methodologies described above are subjective and require judgments regarding significant matters, such as the amount and timing of future cash flows, prepayment speed assumptions, expected interest rate volatility, methods to determine possible distributions of future interest rates used to value options, and the selection of discount rates that appropriately reflect market and credit risks. Changes in these judgments often have a material effect on the fair value estimates. Fair Value Measurements. The following tables present the fair value of assets and liabilities, which are recorded on a recurring or nonrecurring basis at September 30, 2020, and December 31, 2019, by level within the fair value hierarchy. September 30, 2020 Fair Value Measurement Using: Netting Adjustments and Cash Collateral (1) Level 1 Level 2 Level 3 Total Recurring fair value measurements – Assets: Trading securities: U.S. obligations – Treasury securities $ — $ 4,278 $ — $ — $ 4,278 MBS – Other U.S. obligations – Ginnie Mae — 3 — — 3 Total trading securities — 4,281 — — 4,281 AFS securities: U.S. obligations – Treasury securities — 3,801 — — 3,801 MBS: GSEs – multifamily — 8,734 — — 8,734 PLRMBS — — 2,136 — 2,136 Subtotal MBS — 8,734 2,136 — 10,870 Total AFS securities — 12,535 2,136 — 14,671 Advances (2) — 3,103 — — 3,103 Derivative assets, net: interest rate-related — 58 — (2) 56 Other assets 20 — — — 20 Total recurring fair value measurements – Assets $ 20 $ 19,977 $ 2,136 $ (2) $ 22,131 Recurring fair value measurements – Liabilities: Consolidated obligation bonds (3) $ — $ 112 $ — $ — $ 112 Derivative liabilities, net: interest rate-related — 330 — (329) 1 Total recurring fair value measurements – Liabilities $ — $ 442 $ — $ (329) $ 113 Nonrecurring fair value measurements – Assets: (4) Impaired mortgage loans held for portfolio $ — $ — $ 24 $ — $ 24 Total nonrecurring fair value measurements – Assets $ — $ — $ 24 $ — $ 24 December 31, 2019 Fair Value Measurement Using: Netting Adjustments and Cash Collateral (1) Level 1 Level 2 Level 3 Total Recurring fair value measurements – Assets: Trading securities: U.S. obligations – Treasury securities $ — $ 1,762 $ — $ — $ 1,762 MBS – Other U.S. obligations – Ginnie Mae — 4 — — 4 Total trading securities — 1,766 — — 1,766 AFS securities: U.S. obligations – Treasury securities — 5,288 — — 5,288 MBS: GSEs – multifamily — 7,610 — — 7,610 PLRMBS — — 2,597 — 2,597 Subtotal MBS — 7,610 2,597 — 10,207 Total AFS securities — 12,898 2,597 — 15,495 Advances (2) — 4,370 — — 4,370 Derivative assets, net: interest rate-related — 44 — (11) 33 Other assets 19 — — — 19 Total recurring fair value measurements – Assets $ 19 $ 19,078 $ 2,597 $ (11) $ 21,683 Recurring fair value measurements – Liabilities: Consolidated obligation bonds (3) $ — $ 337 $ — $ — $ 337 Derivative liabilities, net: interest rate-related — 384 — (384) — Total recurring fair value measurements – Liabilities $ — $ 721 $ — $ (384) $ 337 Nonrecurring fair value measurements – Assets: (4) Impaired mortgage loans held for portfolio $ — $ — $ 1 $ — $ 1 Total nonrecurring fair value measurements – Assets $ — $ — $ 1 $ — $ 1 (1) 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. (2) Represents advances recorded under the fair value option at September 30, 2020, and December 31, 2019. (3) Represents consolidated obligation bonds recorded under the fair value option at September 30, 2020, and December 31, 2019. (4) The fair value information presented is as of the date the fair value adjustment was recorded during the nine months ended September 30, 2020, and the year ended December 31, 2019. The following tables present a reconciliation of the Bank’s AFS PLRMBS that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2020 and 2019. Three Months Ended September 30, 2020 September 30, 2019 Balance, beginning of the period $ 2,225 $ 2,929 Total gain/(loss) realized and unrealized included in: Interest income 17 20 (Provision for)/reversal of credit losses 4 — Other income, net — (3) Unrealized gain/(loss) included in AOCI 29 (15) Settlements (139) (176) Balance, end of the period $ 2,136 $ 2,755 Total amount of gain/(loss) for the period included in earnings attributable to the change in unrealized gains/losses relating to assets and liabilities still held at the end of the period $ 20 $ 16 Nine Months Ended September 30, 2020 September 30, 2019 Balance, beginning of the period $ 2,597 $ 3,157 Total gain/(loss) realized and unrealized included in: Interest income 53 57 (Provision for)/reversal of credit losses (26) — Other income, net — (8) Unrealized gain/(loss) included in AOCI (111) 1 Settlements (378) (452) Transfers of HTM securities to AFS securities 1 — Balance, end of the period $ 2,136 $ 2,755 Total amount of gain/(loss) for the period included in earnings attributable to the change in unrealized gains/losses relating to assets and liabilities still held at the end of the period $ 27 $ 46 Fair Value Option. The fair value option provides an entity with an irrevocable option to elect fair value as an alternative measurement for selected financial assets, financial liabilities, unrecognized firm commitments, and written loan commitments not previously carried at fair value. It requires an entity to display the fair value of those assets and liabilities for which the entity has chosen to use fair value on the face of the Statements of Condition. Fair value is used for both the initial and subsequent measurement of the designated assets, liabilities, and commitments, with the changes in fair value recognized in net income. Interest income and interest expense on advances and consolidated bonds carried at fair value are recognized solely on the contractual amount of interest due or unpaid. Any transaction fees or costs are immediately recognized in non-interest income or non-interest expense. For more information on the Bank’s election of the fair value option, see “Item 8. Financial Statements and Supplementary Data – Note 19 – Fair Values” in the Bank’s 2019 Form 10-K. The Bank has elected the fair value option for certain financial instruments to assist in mitigating potential earnings volatility that can arise from economic hedging relationships in which the carrying value of the hedged item is not adjusted for changes in fair value. The potential earnings volatility associated with using fair value only for the derivative is the Bank’s primary reason for electing the fair value option for financial assets and liabilities that do not qualify for hedge accounting or that have not previously met or may be at risk for not meeting the hedge effectiveness requirements. The following tables summarize the activity related to financial assets and liabilities for which the Bank elected the fair value option during the three and nine months ended September 30, 2020 and 2019: Three Months Ended September 30, 2020 September 30, 2019 Advances Consolidated Advances Consolidated Balance, beginning of the period $ 3,478 $ 128 $ 4,529 $ 943 Maturities and terminations (367) (15) (583) (365) Net gain/(loss) on advances and net (gain)/loss on consolidated obligation bonds from changes in fair value recognized in earnings (8) (1) 22 2 Change in accrued interest — — (1) (3) Balance, end of the period $ 3,103 $ 112 $ 3,967 $ 577 Nine Months Ended September 30, 2020 September 30, 2019 Advances Consolidated Advances Consolidated Balance, beginning of the period $ 4,370 $ 337 $ 5,133 $ 2,019 New transactions elected for fair value option 7,070 — 74 — Maturities and terminations (8,432) (225) (1,363) (1,448) Net gain/(loss) on advances and net (gain)/loss on consolidated obligation bonds from changes in fair value recognized in earnings 97 1 125 14 Change in accrued interest (2) (1) (2) (8) Balance, end of the period $ 3,103 $ 112 $ 3,967 $ 577 For instruments for which the fair value option has been elected, the related contractual interest income and contractual interest expense are recorded as part of net interest income on the Statements of Income. The remaining changes in fair value for instruments for which the fair value option has been elected are recorded as net gains/ (losses) on financial instruments held under the fair value option in the Statements of Income, except for changes in fair value related to instrument-specific credit risk, which are recorded in AOCI on the Statements of Condition. For advances and consolidated obligations recorded under the fair value option, the Bank determined that none of the remaining changes in fair value were related to instrument-specific credit risk for the three and nine months ended September 30, 2020 and 2019. In determining that there has been no change in instrument-specific credit risk period to period, the Bank primarily considered the following factors: • The Bank is a federally chartered GSE, and as a result of this status, the consolidated obligations have historically received the same credit ratings as the government bond credit rating of the United States, even though they are not obligations of the United States and are not guaranteed by the United States. • The Bank is jointly and severally liable with the other FHLBanks for the payment of principal and interest on all consolidated obligations of each of the FHLBanks. The following table presents the difference between the aggregate remaining contractual principal balance outstanding and aggregate fair value of advances and consolidated obligation bonds for which the Bank elected the fair value option at September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Principal Balance Fair Value Fair Value Principal Balance Fair Value Fair Value Advances (1) $ 2,938 $ 3,103 $ 165 $ 4,287 $ 4,370 $ 83 Consolidated obligation bonds 110 112 2 335 337 2

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies As provided by the FHLBank Act or regulations governing the operations of the FHLBanks, all FHLBanks have joint and several liability for all FHLBank consolidated obligations, which are backed only by the financial resources of the FHLBanks. The joint and several liability regulation authorizes the Finance Agency to require any FHLBank to repay all or a portion of the principal or interest on consolidated obligations for which another FHLBank is the primary obligor. The regulations provide a general framework for addressing the possibility that an FHLBank may be unable to repay the consolidated obligations for which it is the primary obligor. The Bank has never been asked or required to repay the principal or interest on any consolidated obligation on behalf of another FHLBank, and as of September 30, 2020, and through the filing date of this report, does not believe that it is probable that it will be asked to do so. The par value of the outstanding consolidated obligations of the FHLBanks was $819,863 at September 30, 2020, and $1,025,895 at December 31, 2019. The par value of the Bank’s participation in consolidated obligations was $68,204 at September 30, 2020, and $98,817 at December 31, 2019. For more information on the joint and several liability regulation, see “Item 8. Financial Statements and Supplementary Data – Note 20 – Commitments and Contingencies” in the Bank’s 2019 Form 10-K. Off-balance sheet commitments as of September 30, 2020, and December 31, 2019, were as follows: September 30, 2020 December 31, 2019 Expire Within Expire After Total Expire Within Expire After Total Standby letters of credit outstanding $ 12,980 $ 4,723 $ 17,703 $ 16,898 $ 4,658 $ 21,556 Commitments to issue consolidated obligation discount notes, par — — — 805 — 805 Commitments to issue consolidated obligation bonds, par 170 — 170 — — — Commitments to purchase mortgage loans 6 — 6 46 — 46 Standby letters of credit are generally issued for a fee on behalf of members to support their obligations to third parties. If the Bank is required to make a payment for a beneficiary’s drawing under a letter of credit, the amount is immediately due and payable by the member to the Bank and is charged to the member’s demand deposit account with the Bank. At September 30, 2020, the original terms of these standby letters of credit range from 8 days to 15 years, including a final expiration in 2035. The Bank monitors the creditworthiness of members that have standby letters of credit. The value of the Bank’s obligations related to standby letters of credit is recorded in other liabilities and amounted to $33 and $32 at September 30, 2020, and December 31, 2019, respectively. Standby letters of credit are fully collateralized at the time of issuance. Based on the Bank’s credit analyses of members’ financial condition and collateral requirements, the Bank deemed it unnecessary to record any additional liability for credit losses on the letters of credit outstanding or other off-balance sheet commitments as of September 30, 2020, and December 31, 2019. There were no commitments to fund advances at September 30, 2020, and December 31, 2019. Advances funded under advance commitments are fully collateralized at the time of funding. The Bank may enter into commitments that unconditionally obligate it to purchase mortgage loans from its members. Commitments are generally for periods not exceeding 60 days. Delivery commitments are recorded at fair value as derivative assets or derivative liabilities in the Statements of Condition. The Bank has pledged securities as collateral related to derivatives. See Note 11 – Derivatives and Hedging Activities for additional information about the Bank’s pledged collateral and other credit-risk-related contingent features. As of September 30, 2020, the Bank had pledged total collateral of $721, including securities with a carrying value of $386, all of which may be repledged, and cash collateral and related accrued interest of $335 to counterparties and the clearinghouse that had market risk exposure to the Bank related to derivatives. As of December 31, 2019, the Bank had pledged total collateral of $759, including securities with a carrying value of $381, all of which may be repledged, and cash collateral and related accrued interest of $378 to counterparties and the clearinghouse that had market risk exposure to the Bank related to derivatives. The Bank may be subject to various pending legal proceedings that may arise in the ordinary course of business. After consultation with legal counsel, the Bank does not anticipate that the ultimate liability, if any, arising out of these matters will have a material effect on its financial condition or results of operations.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Note 15 — Subsequent Events There were no material subsequent events identified, subsequent to September 30, 2020, until the time of the Form 10-Q filing with the Securities and Exchange Commission.

Summary of Significant Accounti

Summary of Significant Accounting Policies / Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy	Recently Issued and Accounting Guidance, Not Yet Adopted Accounting Standards Update (ASU) Description Effective Date Effect on the Financial Statements or Other Significant Matters Facilitation of the Effects of Reference Rate Reform on Financial Reporting (ASU 2020-04) This guidance provides temporary optional guidance to ease the potential burden in accounting for reference rate reform. The new guidance provides optional expedients and exceptions for applying generally accepted accounting principles to transactions affected by reference rate reform if certain criteria are met. These transactions include: This guidance is effective immediately for the Bank, and the Bank may elect to apply the amendments prospectively through December 31, 2022. The Bank has assessed the guidance and plans to elect some of the optional expedients and exceptions provided; however, the effect on the Bank’s financial condition, results of operations, and cash flows has not yet been determined. Changes to the Disclosure Requirements for Defined Benefit Plans (ASU 2018-14) This guidance modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans to improve disclosure effectiveness. This guidance becomes effective for the Bank for the annual period ended December 31, 2020, and the annual periods thereafter. Early adoption is permitted. The adoption of this guidance will affect the Bank’s disclosures but will not have any effect on the Bank’s financial condition, results of operations, or cash flows. Recently Adopted Accounting Guidance ASU Description Effective Date Effect on the Financial Statements or Other Significant Matters Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15) This guidance aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2020. The guidance was adopted as of January 1, 2020. The adoption of this guidance did not have any effect on the Bank’s financial condition, results of operations, or cash flows. Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13) This guidance modifies the disclosure requirements for fair value measurements to improve disclosure effectiveness. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2020. The guidance was adopted as of January 1, 2020. The adoption of this guidance impacted the Bank’s disclosures but did not have any effect on the Bank’s financial condition, results of operations, or cash flows. Measurement of Credit Losses on Financial Instruments, as amended (ASU 2016-13) The guidance replaces the current incurred loss impairment model and requires entities to measure expected credit losses based on consideration of a broad range of relevant information, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The guidance also requires, among other things, credit losses relating to AFS securities to be recorded through an allowance for credit losses and expands disclosure requirements. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2020. This guidance was adopted using a modified retrospective basis as of January 1, 2020. Upon adoption, this guidance had no effect on advances or U.S. obligations and Government-Sponsored Enterprises (GSEs) investments. The adoption of this guidance had an immaterial effect on the remaining investment portfolio given the specific terms, issuer guarantees, and collateralized/securitized nature of these instruments, on mortgage loans, and on the Bank’s financial condition, results of operations, and cash flows.
Subsequent Events, Policy [Policy Text Block]	There were no material subsequent events identified, subsequent to September 30, 2020, until the time of the Form 10-Q filing with the Securities and Exchange Commission.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates. The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) requires management to make a number of judgments, estimates, and assumptions that may affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of income, expenses, gains, and losses during the reporting period. The most significant of these estimates include: • accounting for derivatives; • estimating fair values of investments classified as trading and AFS, derivatives and associated hedged items carried at fair value in accordance with the accounting for derivative instruments and associated hedging activities, and financial instruments carried at fair value under the fair value option; and • estimating the prepayment speeds on mortgage-backed securities (MBS) and mortgage loans for the accounting of amortization of premiums and accretion of discounts and credit losses previously recorded prior to the adoption of new accounting guidance related to the measurement of credit losses on MBS and mortgage loans. Actual results could differ significantly from these estimates. Gain on Disgorgement Settlement. During the third quarter of 2020, the Bank received disgorgement proceeds in the amount of $85 in connection with a Securities and Exchange Commission enforcement action. Disgorgement proceeds are recorded in Other Income/(Loss) in “Gain on disgorgement settlement” in the Statements of Income. Disgorgement proceeds are considered realized and recorded when the Bank receives cash or assets that are readily convertible to known amounts of cash or claims to cash, when the Bank enters into a signed agreement that is not subject to appeal, where the counterparty has the ability to pay, and the amount to be received can be reasonably estimated. Prior to being realized or realizable, the Bank considers potential disgorgement proceeds to be gain contingencies, and therefore they are not recorded in the Statements of Income.
Credit Loss, Financial Instrument [Policy Text Block]	Measurement of Credit Losses on Financial Instruments, as AmendedBeginning January 1, 2020, the Bank adopted new accounting guidance related to the measurement of credit losses on financial instruments that requires a financial asset or group of financial assets measured at amortized cost to be presented at the net amount expected to be collected. The new guidance also requires credit losses relating to these financial instruments as well as available-for-sale (AFS) securities to be recorded through the allowance for credit losses. Key changes as compared to prior accounting guidance are detailed below. Consistent with the modified retrospective method of adoption, the prior period has not been revised to conform to the new basis of accounting. For information on the prior accounting treatment and for descriptions of the Bank’s significant accounting policies, see “Item 8. Financial Statements and Supplementary Data – Note 1 – Summary of Significant Accounting Policies” in the Bank’s 2019 Form 10-K. Other changes to these policies as of September 30, 2020, are discussed in Note 2 – Recently Issued and Adopted Accounting Guidance.
Derivatives Credit Policy [Policy Text Block]	The Bank is subject to credit risk from potential nonperformance by counterparties to the interest rate exchange agreements. All of the Bank’s agreements governing uncleared derivative transactions contain master netting provisions to help mitigate the credit risk exposure to each counterparty. The Bank manages counterparty credit risk through credit analyses and collateral requirements and by following the requirements of the Bank’s risk management policies, credit guidelines, and Finance Agency and other regulations. The Bank also requires credit support agreements on all uncleared derivatives.For cleared derivatives, the clearinghouse is the Bank’s counterparty. The requirement that the Bank post initial and variation margin through a clearing agent, to the clearinghouse, exposes the Bank to institutional credit risk in the event that the clearing agent or the clearinghouse fails to meet its obligations. The use of cleared derivatives, however, mitigates the Bank’s overall credit risk exposure because a central counterparty is substituted for individual counterparties. Variation margin and initial margin are posted for changes in the value and risk profile of cleared derivatives. The Bank has analyzed the enforceability of offsetting rights applicable to its cleared derivative transactions and determined that the exercise of those offsetting rights by a non-defaulting party under these transactions should be upheld under applicable bankruptcy law and Commodity Futures Trading Commission rules in the event of a clearinghouse or clearing agent insolvency and under applicable clearinghouse rules upon a non-insolvency-based event of default of the clearinghouse or clearing agent. Based on this analysis, the Bank presents a net derivative receivable or payable for all of its transactions through a particular clearing agent with a particular clearinghouse.
Derivatives, Methods of Accounting, Hedging Derivatives	The Bank may enter into interest rate swaps (including callable, putable, and basis swaps); and cap and floor agreements (collectively, interest rate exchange agreements or derivatives). Most of the Bank’s interest rate exchange agreements are executed in conjunction with the origination of advances or the issuance of consolidated obligations to create variable rate structures. The interest rate exchange agreements are generally executed at the same time the advances and consolidated obligations are transacted and generally have the same maturity dates as the related hedged instrument. The Bank transacts most of its derivatives with large banks and major broker-dealers. Some of these banks and broker-dealers or their affiliates buy, sell, and distribute consolidated obligations. Derivatives may be either uncleared or cleared. In an uncleared derivative transaction, the Bank’s counterparty is the executing bank or broker-dealer. In a cleared derivative transaction, the Bank may execute the transaction either directly with the executing bank or broker-dealer or on a swap execution facility, but in either case, the Bank’s counterparty is a derivatives clearing organization (clearinghouse) once the derivative transaction has been accepted for clearing. The Bank is not a derivatives dealer and does not trade derivatives for short-term profit.Additional uses of interest rate exchange agreements include: (i) offsetting embedded features in assets and liabilities, (ii) hedging anticipated issuance of debt, (iii) matching against consolidated obligation discount notes to create the equivalent of callable or non-callable fixed rate debt, (iv) modifying the repricing frequency of assets and liabilities, (v) matching against certain advances and consolidated obligations for which the Bank elected the fair value option, and (vi) exactly offsetting other derivatives cleared at a clearinghouse. The Bank’s use of interest rate exchange agreements results in one of the following classifications: (i) a fair value hedge of an underlying financial instrument or (ii) an economic hedge of assets, liabilities, or other derivatives.
Derivatives, Embedded Derivatives	When a callable bond for which the Bank is the primary obligor is issued, the Bank may simultaneously enter into an interest rate swap (in which the Bank pays a variable rate and receives a fixed rate) with a call feature that mirrors the call option embedded in the bond (a sold callable swap). The Bank did not have any bonds with embedded features that met the requirements to separate the embedded feature from the host contract and designate the embedded feature as a stand-alone derivative at September 30, 2020, or December 31, 2019. The Bank has generally elected to account for certain bonds with embedded features under the fair value option, and these bonds are carried at fair value on the Statements of Condition.
Stockholders' Equity, Policy	Under the Housing Act, the Director of the Finance Agency is responsible for setting the risk-based capital standards for the FHLBanks. The FHLBank Act and regulations governing the operations of the FHLBanks require that the Bank’s minimum capital stock requirement for shareholders must be sufficient to enable the Bank to meet its regulatory requirements for total capital, leverage capital, and risk-based capital. The Bank must maintain: (i) total regulatory capital in an amount equal to at least 4% of its total assets, (ii) leverage capital in an amount equal to at least 5% of its total assets, and (iii) permanent capital in an amount that is greater than or equal to its risk-based capital requirement. Beginning in February 2020, the Finance Agency issued guidance that augmented existing statutory and regulatory capital requirements to require each FHLBank to maintain a ratio of at least two percent of capital stock to total assets in order to help preserve the cooperative structure incentives that encourage members to remain fully engaged in the oversight of their investment in the FHLBank. The Finance Agency will consider the proportion of capital stock to assets, measured on a daily average basis at monthend, when assessing each FHLBank’s capital management practices. As of September 30, 2020, the Bank was in compliance with this capital guidance. Because the Bank issues only Class B stock, regulatory capital and permanent capital for the Bank are both composed of retained earnings and Class B stock, including mandatorily redeemable capital stock (which is classified as a liability for financial reporting purposes). Regulatory capital and permanent capital do not include AOCI. Leverage capital is defined as the sum of permanent capital, weighted by a 1.5 multiplier, plus non-permanent capital. The risk-based capital requirement is equal to the sum of the Bank’s credit risk, market risk, and operations risk capital requirements, all of which are calculated in accordance with the rules and regulations of the Finance Agency. The Finance Agency may require an FHLBank to maintain a greater amount of permanent capital than is required by the risk-based capital requirement as defined.
Segment Reporting, Policy	The Bank uses an analysis of financial results based on the financial components and adjusted net interest income of two operating segments, the advances-related business and the mortgage-related business, as well as other financial information, to review and assess financial performance and determine financial management strategies related to the operations of these two business segments. For purposes of segment reporting, adjusted net interest income includes income and expense associated with net settlements from economic hedges that are recorded in “Net gain/(loss) on derivatives and hedging activities” in other income, excludes interest income and expense associated with ineffectiveness from fair value hedges that are recorded in the same line as the earnings effect of the hedged item, and excludes interest expense that is recorded in “Mandatorily redeemable capital stock.” Other key financial information, such as assessments, is not included in the segment reporting analysis, but is incorporated into the Bank’s overall assessment of financial performance. For more information on these operating segments, see “Item 8. Financial Statements and Supplementary Data – Note 17 – Segment Information” in the Bank’s 2019 Form 10-K.
Fair Value of Financial Instruments, Policy	The fair value hierarchy is used to prioritize the fair value methodologies and valuation techniques as well as the inputs to the valuation techniques used to measure fair value for assets and liabilities carried at fair value on the Statements of Condition. The inputs are evaluated and an overall level for the fair value measurement is determined. This overall level is an indication of market observability of the fair value measurement for the asset or liability. The fair value hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). An entity must disclose the level within the fair value hierarchy in which the measurements are classified for all financial assets and liabilities measured on a recurring or non-recurring basis. The application of the fair value hierarchy to the Bank’s financial assets and financial liabilities that are carried at fair value either on a recurring or non-recurring basis is as follows: • Level 1 – Quoted prices (unadjusted) for identical assets or liabilities in an active market that the reporting entity can access on the measurement date. An active market for the asset or liability is a market in which the transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. • Level 2 – Inputs other than quoted prices within Level 1 that are observable inputs for the asset or liability, either directly or indirectly. If the asset or liability has a specified (contractual) term, a Level 2 input must be observable for substantially the full term of the asset or liability. Level 2 inputs include the following: (1) quoted prices for similar assets or liabilities in active markets; (2) quoted prices for identical or similar assets or liabilities in markets that are not active; (3) inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates and yield curves that are observable at commonly quoted intervals, and implied volatilities); and (4) inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3 – Unobservable inputs for the asset or liability. A financial instrument’s categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The following assets and liabilities, including those for which the Bank has elected the fair value option, are carried at fair value on the Statements of Condition as of September 30, 2020: • Trading securities • AFS securities • Certain advances • Derivative assets and liabilities • Certain consolidated obligation bonds • Certain other assets For more information on the Bank’s election of the fair value option, see “Item 8. Financial Statements and Supplementary Data – Note 19 – Fair Values” in the Bank’s 2019 Form 10-K. The Bank has elected the fair value option for certain financial instruments to assist in mitigating potential earnings volatility that can arise from economic hedging relationships in which the carrying value of the hedged item is not adjusted for changes in fair value. The potential earnings volatility associated with using fair value only for the derivative is the Bank’s primary reason for electing the fair value option for financial assets and liabilities that do not qualify for hedge accounting or that have not previously met or may be at risk for not meeting the hedge effectiveness requirements.
Fair Value Transfer, Policy	For instruments carried at fair value, the Bank reviews the fair value hierarchy classifications on a quarterly basis. Changes in the observability of the valuation inputs may result in a reclassification of certain assets or liabilities. For the periods presented, the Bank did not have any reclassifications for transfers in or out of level 3 of the fair value hierarchy.
Commitments and Contingencies, Policy	Delivery commitments are recorded at fair value as derivative assets or derivative liabilities in the Statements of Condition.
Investment, Policy	Interest-bearing Deposits, Securities Purchased under Agreements to Resell, and Federal Funds Sold. The Bank invests in interest-bearing deposits, securities purchased under agreements to resell, and Federal funds sold. These investments provide short-term liquidity and are carried at cost. Accrued interest receivable is recorded separately on the Statements of Condition. These investments are evaluated quarterly for expected credit losses. If applicable, an allowance for credit loss is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. The Bank treats securities purchased under agreements to resell as collateralized financing arrangements because they effectively represent short-term loans to counterparties that are considered by the Bank to be of investment quality, which are classified as assets in the Statements of Condition. Securities purchased under agreements to resell are held in safekeeping in the name of the Bank by third-party custodians approved by the Bank. In accordance with the terms of these loans, if the market value of the underlying securities decreases below the market value required as collateral, the counterparty must place an equivalent amount of additional securities as collateral or remit an equivalent amount of cash. Consequently, a credit loss would be recognized if there is a collateral shortfall which the Bank does not believe the counterparty will replenish in accordance with its contractual terms. The credit loss would be limited to the difference between the fair value of the collateral and the investment’s cost. The Bank invests in Federal funds sold with counterparties that are considered by the Bank to be of investment quality. See Note 3 – Investments for details on the allowance methodologies relating to interest-bearing deposits, securities purchased under agreements to resell, and Federal funds sold. Investment Securities. On a quarterly basis, the Bank evaluates its individual AFS investment securities in an unrealized loss position for impairment. A security is considered impaired when its fair value is less than its amortized cost basis. With respect to any debt security, a credit loss is defined as the amount by which the amortized cost basis exceeds the present value of the cash flows expected to be collected. If a credit loss exists but the entity does not intend to sell the debt security and it is not more likely than not that the entity will be required to sell the debt security before the anticipated recovery of its remaining amortized cost basis (the amortized cost basis less any current-period credit loss), an allowance for credit losses is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. The allowance is limited by the amount of the unrealized loss. Accrued interest receivable is recorded separately on the Statements of Condition. The allowance for credit losses excludes uncollectible accrued interest receivable, which is measured separately. If management intends to sell an impaired security classified as AFS, or more likely than not will be required to sell the security before expected recovery of its amortized cost basis, any allowance for credit losses is written off and the amortized cost basis is written down to the security’s fair value at the reporting date with any incremental impairment reported in earnings as net unrealized gain/(loss) on AFS securities. If management does not intend to sell an impaired security classified as AFS and it is not more likely than not that management will be required to sell the debt security, then the credit portion of the difference is recognized as an allowance for credit losses and any remaining difference between the security’s fair value and amortized cost is recorded to net unrealized gain/(loss) on AFS securities within other comprehensive income/(loss). Prior to January 1, 2020, credit losses were recorded as a direct write-down of the AFS security carrying value. For improvements in cash flows of AFS securities, interest income follows the recognition pattern pursuant to the impairment guidance in effect prior to January 1, 2020, and recoveries of amounts previously written off are recorded when received. AFS securities with a credit loss recognized pursuant to the impairment guidance in effect prior to January 1, 2020, continue to follow the prior accounting until maturity or disposition. For improvements in impaired AFS securities with an allowance for credit losses recognized after the adoption of the new guidance, the allowance for credit losses associated with recoveries may be derecognized up to its full amount. Effective January 1, 2020, the net non-credit-related other-than-temporary impairment (OTTI) gain/(loss) on AFS securities was reclassified to net unrealized gain/(loss) on AFS securities within other comprehensive income/(loss). Held-to-maturity (HTM) securities are carried at cost, adjusted for periodic principal repayments, amortization of premiums and accretion of discounts, and previous credit loss recognized in net income and Accumulated Other Comprehensive Income (AOCI) recorded prior to January 1, 2020. On a quarterly basis, the Bank evaluates its HTM investment securities for expected credit losses on a pool basis unless an individual assessment is deemed necessary because the securities do not possess similar risk characteristics. If necessary, an allowance for credit losses is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. Prior to January 1, 2020, credit losses were recorded as a direct write-down of the HTM security carrying value. Accrued interest receivable is recorded separately on the Statements of Condition. The allowance for credit losses excludes uncollectible accrued interest receivable, which is measured separately. For improvements in HTM securities impaired prior to January 1, 2020, interest income continues to follow the recognition pattern pursuant to the impairment guidance in effect prior to January 1, 2020, and recoveries of amounts previously written off are recorded when received. For improvements in impaired HTM securities with an allowance for credit losses recognized after the adoption of the new guidance, the allowance for credit losses associated with recoveries may be derecognized up to its full amount. See Note 3 – Investments for details on the allowance methodologies relating to AFS and HTM securities.
Federal Home Loan Bank, Advances [Text Block]	Note 4 — Advances The Bank offers a wide range of fixed and adjustable rate advance products with different maturities, interest rates, payment characteristics, and option features. Fixed rate advances generally have maturities ranging from one day to 30 years. Adjustable rate advances generally have maturities ranging from less than 30 days to 10 years, with the interest rates resetting periodically at a fixed spread to a specified index. Redemption Terms. The Bank had advances outstanding, excluding overdrawn demand deposit accounts, at interest rates ranging from 0.00% to 8.57% at September 30, 2020, and 1.15% to 8.57% at December 31, 2019, as summarized below. September 30, 2020 December 31, 2019 Redemption Term Amount Outstanding (1) Weighted Amount Outstanding (1) Weighted Overdrawn demand and overnight deposit accounts $ 1 0.01 % $ — — % Within 1 year 13,115 1.29 32,351 1.91 After 1 year through 2 years 12,031 1.65 22,380 2.15 After 2 years through 3 years 2,764 2.16 4,847 2.08 After 3 years through 4 years 3,546 2.48 2,909 2.97 After 4 years through 5 years 3,988 1.38 1,461 2.32 After 5 years 1,445 2.20 1,140 2.96 Total par value 36,890 1.63 % 65,088 2.08 % Valuation adjustments for hedging activities 639 203 Valuation adjustments under fair value option 165 83 Unamortized discounts (1) — Total $ 37,693 $ 65,374 (1) Carrying amounts exclude accrued interest receivable of $7 and $39 at September 30, 2020, and December 31, 2019, respectively. Many of the Bank’s advances are prepayable at the borrower’s option. However, when advances are prepaid, the borrower is generally charged a prepayment fee intended to make the Bank financially indifferent to the prepayment. In addition, for certain advances with full or partial prepayment symmetry, the Bank may charge the borrower a prepayment fee or pay the borrower a prepayment credit depending on certain circumstances, such as movements in interest rates, when the advance is prepaid. The Bank had advances with full prepayment symmetry outstanding totaling $21,195 at September 30, 2020, and $14,059 at December 31, 2019. The Bank had advances with partial prepayment symmetry outstanding totaling $2,738 at September 30, 2020, and $3,513 at December 31, 2019. Some advances may be repaid on pertinent call dates without prepayment fees (callable advances). The Bank had callable advances outstanding totaling $2,670 at September 30, 2020, and $14,024 at December 31, 2019. The Bank had putable advances totaling $220 at September 30, 2020, and $20 at December 31, 2019. At the Bank’s discretion, the Bank may terminate these advances on predetermined exercise dates and offer replacement funding at prevailing market rates, subject to certain conditions. The Bank would typically exercise such termination rights when interest rates increase relative to contractual rates. The following table summarizes advances at September 30, 2020, and December 31, 2019, by the earlier of the year of redemption term or next call date for callable advances and by the earlier of the year of redemption term or next put date for putable advances. Earlier of Redemption Earlier of Redemption September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Overdrawn demand and overnight deposit accounts $ 1 $ — $ 1 $ — Within 1 year 15,685 39,075 13,335 32,371 After 1 year through 2 years 9,481 15,731 12,031 22,380 After 2 years through 3 years 2,764 4,800 2,764 4,847 After 3 years through 4 years 3,546 2,895 3,546 2,909 After 4 years through 5 years 3,968 1,447 3,988 1,461 After 5 years 1,445 1,140 1,225 1,120 Total par value $ 36,890 $ 65,088 $ 36,890 $ 65,088 Concentration Risk. The following tables present the concentration in advances to the top five borrowers and their affiliates at September 30, 2020 and 2019. The tables also present the interest income from these advances before the impact of interest rate exchange agreements associated with these advances for the three and nine months ended September 30, 2020 and 2019. September 30, 2020 Three Months Ended Nine Months Ended Name of Borrower Advances Percentage of Interest (1) Percentage of Interest (1) Percentage of First Republic Bank $ 13,510 37 % $ 62 35 % $ 201 28 % MUFG Union Bank, National Association 4,925 13 36 21 141 19 CIT Bank, National Association 2,550 7 4 2 20 3 First Technology Federal Credit Union 1,975 5 11 6 34 5 Luther Burbank Savings 962 3 5 3 16 2 Subtotal 23,922 65 118 67 412 57 Others 12,968 35 57 33 310 43 Total par value $ 36,890 100 % $ 175 100 % $ 722 100 % September 30, 2019 Three Months Ended Nine Months Ended Name of Borrower Advances Percentage of Interest (1) Percentage of Interest (1) Percentage of MUFG Union Bank, National Association $ 14,100 22 % $ 92 24 % $ 287 22 % First Republic Bank 11,200 18 62 16 175 13 Wells Fargo & Company Wells Fargo Financial National Bank West 8,000 13 49 13 150 12 Wells Fargo Bank, National Association (2) 41 — 1 — 2 — Subtotal Wells Fargo & Company 8,041 13 50 13 152 12 Bank of the West 5,556 9 41 10 124 9 JPMorgan Chase Bank, National Association (2) 5,056 8 33 9 144 11 Subtotal 43,953 70 278 72 882 67 Others 18,486 30 110 28 427 33 Total par value $ 62,439 100 % $ 388 100 % $ 1,309 100 % (1) Interest income amounts exclude the interest effect of interest rate exchange agreements with derivative counterparties; as a result, the total interest income amounts will not agree to the Statements of Income. The amount of interest income from advances can vary depending on the amount outstanding, terms to maturity, interest rates, and repricing characteristics. (2) Nonmember institution. The Bank held a security interest in collateral from each of the top five advances borrowers and their affiliates sufficient to support their respective advances outstanding, and the Bank does not expect to incur any credit losses on these advances. Credit Risk Exposure and Security Terms. The Bank manages its credit exposure related to advances through an integrated approach that generally provides for a credit limit to be established for each borrower, includes an ongoing review of each borrower’s financial condition, and is coupled with conservative collateral and lending policies to limit the risk of loss while taking into account borrowers’ needs for a reliable funding source. In addition, the Bank lends to eligible borrowers in accordance with federal law and Finance Agency regulations. Specifically, the Bank is required to obtain sufficient collateral to fully secure credit products up to the member’s total credit limit. Borrowers may pledge the following eligible assets to secure advances: • one-to-four-family first lien residential mortgage loans; • securities issued, insured, or guaranteed by the U.S. government or any of its agencies, including without limitation MBS backed by Fannie Mae, Freddie Mac, or Ginnie Mae; • cash or deposits in the Bank; • certain other real estate-related collateral, such as multifamily loans, commercial real estate loans, and second lien residential mortgage loans or home equity loans; and • small business, small farm, and small agribusiness loans that are fully secured by collateral (such as real estate, equipment and vehicles, accounts receivable, and inventory) from members that are community financial institutions. At September 30, 2020, and December 31, 2019, none of the Bank’s credit products were past due or on nonaccrual status. There were no troubled debt restructurings related to credit products during the nine months ended September 30, 2020, or during 2019. Based on the collateral pledged as security for advances, the Bank’s credit analyses of borrowers’ financial condition, repayment history on advances, and the Bank’s credit extension and collateral policies as of September 30, 2020, the Bank expects to collect all amounts due according to the contractual terms. Therefore, no allowance for losses on advances was deemed necessary by the Bank as of September 30, 2020, and December 31, 2019. For more information on the credit risk exposure and security terms of advances, see “Item 8. Financial Statements and Supplementary Data – Note 10 – Allowance for Credit Losses” in the Bank’s 2019 Form 10-K. Interest Rate Payment Terms. Interest rate payment terms for advances at September 30, 2020, and December 31, 2019, are detailed below: September 30, 2020 December 31, 2019 Par value of advances: Fixed rate: Due within 1 year $ 12,343 $ 15,327 Due after 1 year 20,975 21,337 Total fixed rate 33,318 36,664 Adjustable rate: Due within 1 year 772 17,024 Due after 1 year 2,800 11,400 Total adjustable rate 3,572 28,424 Total par value $ 36,890 $ 65,088 The Bank did not have any advances with embedded features that met the requirements to separate the embedded feature from the host contract and designate the embedded feature as a stand-alone derivative at September 30, 2020, or December 31, 2019. The Bank has generally elected to account for certain advances with embedded features under the fair value option, and these advances are carried at fair value on the Statements of Condition. For more information, see Note 11 – Derivatives and Hedging Activities and Note 12 – Fair Value. Prepayment Fees, Net. The Bank charges borrowers prepayment fees or pays borrowers prepayment credits when the principal on certain advances is paid prior to original maturity. The Bank records prepayment fees net of any associated fair value adjustments related to prepaid advances that were hedged. The net amount of prepayment fees is reflected as advances interest income in the Statements of Income for the three and nine months ended September 30, 2020 and 2019, as follows: Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Prepayment fees received $ 38 $ — $ 77 $ — Fair value adjustments (35) — (62) 1 Net $ 3 $ — $ 15 $ 1 Advance principal prepaid $ 5,018 $ 775 $ 21,804 $ 3,506
Federal Home Loan Bank Advances, Policy [Policy Text Block]	Advances. The Bank reports advances (loans to members, former members or their successors or housing associates) either at amortized cost or at fair value when the fair value option is elected. Advances carried at amortized cost are reported net of premiums, discounts (including discounts related to the Affordable Housing Program), and hedging adjustments. Accrued interest receivable is recorded separately on the Statements of Condition. The advances carried at amortized cost are evaluated quarterly for expected credit losses. If deemed necessary, an allowance for credit losses is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. See Note 4 – Advances for details on the allowance methodologies relating to advances.
Off-Balance-Sheet Credit Exposure, Policy	Off-Balance Sheet Credit Exposures. The Bank evaluates its off-balance sheet credit exposures on a quarterly basis for expected credit losses. If deemed necessary, an allowance for expected credit losses on these off-balance sheet exposures is recorded in other liabilities with a corresponding adjustment to the provision for/(reversal of) credit losses. See Note 13 – Commitments and Contingencies for details on the allowance methodologies relating to off-balance sheet credit exposure.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Mortgage loan held for portfolio [Policy Text Block]	Troubled Debt Restructuring Relief). On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) providing optional, temporary relief from accounting for certain loan modifications as troubled debt restructurings (TDRs) was signed into law. Under the CARES Act, TDR relief is available to financial institutions for loan modifications related to the adverse effects of the COVID-19 pandemic (COVID-related modifications) granted to borrowers that were current as of December 31, 2019. TDR relief applies to COVID-related modifications made from March 1, 2020, until the earlier of December 31, 2020, or 60 days following the termination of the national emergency declared by the President of the United States. Starting in the second quarter of 2020, the Bank elected to apply the TDR relief provided by the CARES Act. As such, all COVID-related modifications meeting the provisions of the CARES Act will be excluded from TDR classification and accounting. COVID-related modifications that do not meet the provisions of the CARES Act will continue to be assessed for TDR classification. Mortgage Loans Held for Portfolio. The Bank classifies mortgage loans as held for investment and, accordingly, reports them at their principal amount outstanding net of unamortized premiums, unamortized credit enhancement fees paid as a lump sum at the time loans are purchased, discounts, and unrealized gains and losses from loans initially classified as mortgage loan commitments. The Bank performs a quarterly assessment of its mortgage loans held for portfolio to estimate expected credit losses. An allowance for credit losses is recorded with a corresponding adjustment to the provision for/(reversal of) credit losses. The Bank measures expected credit losses on mortgage loans on a collective basis, pooling loans with similar risk characteristics. If a mortgage loan no longer shares risk characteristics with other loans, it is removed from the pool and evaluated for expected credit losses on an individual basis. When developing the allowance for credit losses, the Bank measures the estimated loss over the remaining life of a mortgage loan, which also considers how the Bank’s credit enhancements mitigate credit losses. The Bank includes estimates of expected recoveries within the allowance for credit losses. If a loan is purchased at a discount, the discount does not offset the allowance for credit losses. Accrued interest receivable is recorded separately on the Statements of Condition. The allowance excludes uncollectible accrued interest receivable, as the Bank writes off accrued interest receivable by reversing interest income if a mortgage loan is placed on nonaccrual status. The Bank does not purchase mortgage loans with credit deterioration present at the time of purchase. See Note 5 – Mortgage Loans Held for Portfolio for details on the allowance methodologies relating to mortgage loans. For more information related to the Bank’s accounting policies for the Mortgage Partnership Finance® (MPF®) Program, see “Item 8. Financial Statements and Supplementary Data – Note 1 – Summary of Significant Accounting Policies” in the Bank’s 2019 Form 10-K. (“Mortgage Partnership Finance,” “MPF,” and “MPF Xtra” are registered trademarks of the FHLBank of Chicago.)
Off-Balance-Sheet Credit Exposure, Policy	Off-Balance Sheet Credit Exposures. The Bank evaluates its off-balance sheet credit exposures on a quarterly basis for expected credit losses. If deemed necessary, an allowance for expected credit losses on these off-balance sheet exposures is recorded in other liabilities with a corresponding adjustment to the provision for/(reversal of) credit losses. See Note 13 – Commitments and Contingencies for details on the allowance methodologies relating to off-balance sheet credit exposure.

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Instrument [Line Items]
Trading Securities (and Certain Trading Assets)	The estimated fair value of trading securities as of September 30, 2020, and December 31, 2019, was as follows: September 30, 2020 December 31, 2019 U.S. obligations – Treasury securities $ 4,278 $ 1,762 MBS – Other U.S. obligations – Ginnie Mae 3 4 Total $ 4,281 $ 1,766
Available-for-sale Securities	AFS securities by major security type as of September 30, 2020, and December 31, 2019, were as follows: September 30, 2020 Amortized Cost (1) Allowance for Credit Losses (2) Gross Gross Estimated Fair Value U.S. obligations – Treasury securities $ 3,797 $ — $ 4 $ — $ 3,801 MBS: GSEs – multifamily: Freddie Mac 851 — 3 (1) 853 Fannie Mae 7,894 — 19 (32) 7,881 Subtotal – GSEs – multifamily 8,745 — 22 (33) 8,734 PLRMBS: Prime 180 (2) 10 — 188 Alt-A 1,821 (22) 171 (22) 1,948 Subtotal PLRMBS 2,001 (24) 181 (22) 2,136 Total MBS 10,746 (24) 203 (55) 10,870 Total $ 14,543 $ (24) $ 207 $ (55) $ 14,671 December 31, 2019 Amortized Cost (1) OTTI Recognized in AOCI (2) Gross Unrealized Gains (3) Gross Estimated Fair Value U.S. obligations – Treasury securities $ 5,281 $ — $ 7 $ — $ 5,288 MBS: GSEs – multifamily: Freddie Mac 773 — 4 — 777 Fannie Mae 6,823 — 23 (13) 6,833 Subtotal – GSEs – multifamily 7,596 — 27 (13) 7,610 PLRMBS: Prime 213 — 17 — 230 Alt-A 2,116 (9) 260 — 2,367 Subtotal PLRMBS 2,329 (9) 277 — 2,597 Total MBS 9,925 (9) 304 (13) 10,207 Total $ 15,206 $ (9) $ 311 $ (13) $ 15,495 (1) Amortized cost includes unpaid principal balance, unamortized premiums and discounts, net charge-offs, and valuation adjustments for hedging activities, and excludes accrued interest receivable of $48 and $58 at September 30, 2020, and December 31, 2019, respectively. (2) Effective January 1, 2020, the Bank completes an analysis on a quarterly basis to determine whether to record an allowance for credit losses for expected credit losses on AFS securities. Prior to January 1, 2020, credit losses were recorded as a direct write-down to the AFS security carrying value. OTTI recognized in AOCI excludes subsequent unrealized gains/(losses) in fair value of previously other-than-temporarily impaired AFS securities at December 31, 2019, which is included in net non-credit-related OTTI on AFS securities. (3) Includes $277 in subsequent unrealized gains in fair value of previously other-than-temporarily impaired AFS securities at December 31, 2019.
Held-to-maturity Securities	The Bank classifies the following securities as HTM because the Bank has the positive intent and ability to hold these securities to maturity: September 30, 2020 Amortized Cost (1) Gross Unrecognized Holding Gains (3) Gross Unrecognized Holding Losses (3) Estimated MBS – Other U.S. obligations – single-family: Ginnie Mae $ 319 $ 9 $ — $ 328 MBS – GSEs – single-family: Freddie Mac 654 14 — 668 Fannie Mae 1,373 24 (1) 1,396 Subtotal MBS – GSEs – single-family 2,027 38 (1) 2,064 MBS – GSEs – multifamily: Freddie Mac 2,110 1 (3) 2,108 Fannie Mae 946 — (2) 944 Subtotal MBS – GSEs – multifamily 3,056 1 (5) 3,052 Subtotal MBS – GSEs 5,083 39 (6) 5,116 PLRMBS: Prime 203 — (6) 197 Alt-A 113 4 (3) 114 Subtotal PLRMBS 316 4 (9) 311 Total $ 5,718 $ 52 $ (15) $ 5,755 December 31, 2019 Amortized Cost (1) OTTI Recognized in AOCI (2) Carrying Gross Unrecognized Holding Gains (3) Gross Unrecognized Holding Losses (3) Estimated MBS – Other U.S. obligations – single-family: Ginnie Mae $ 470 $ — $ 470 $ 5 $ — $ 475 MBS – GSEs – single-family: Freddie Mac 1,063 — 1,063 8 (1) 1,070 Fannie Mae 1,844 — 1,844 20 (1) 1,863 Subtotal MBS – GSEs – single-family 2,907 — 2,907 28 (2) 2,933 MBS – GSEs – multifamily: Freddie Mac 2,625 — 2,625 — (9) 2,616 Fannie Mae 1,159 — 1,159 — (2) 1,157 Subtotal MBS – GSEs – multifamily 3,784 — 3,784 — (11) 3,773 Subtotal MBS – GSEs 6,691 — 6,691 28 (13) 6,706 PLRMBS: Prime 243 — 243 1 (4) 240 Alt-A 142 (1) 141 6 (2) 145 Subtotal PLRMBS 385 (1) 384 7 (6) 385 Total $ 7,546 $ (1) $ 7,545 $ 40 $ (19) $ 7,566 (1) Amortized cost includes unpaid principal balance, unamortized premiums and discounts, and net charge offs, and excludes accrued interest receivable of $5 and $12 at September 30, 2020, and December 31, 2019, respectively. (2) With the adoption of new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020, the OTTI approach was replaced with an evaluation for an allowance for credit loss; however, OTTI remains for those securities that had credit impairment prior to the adoption date. (3) Gross unrecognized gains/(losses) represent the difference between estimated fair value and net carrying value.
Schedule of Significant Inputs In Measuring Other Than Temporary Impairments Recognized In Earnings	the following table presents a summary of the significant inputs used in measuring the fair value of PLRMBS classified as Level 3 as of September 30, 2020, and the related current credit enhancement for the Bank. September 30, 2020 Significant Inputs for Other-Than-Temporarily Impaired PLRMBS Current Prepayment Rates Default Rates Loss Severities Credit Enhancement Collateral Type at Origination Weighted Average % (1) Weighted Average % (1) Weighted Average % (1) Weighted Average % (1) Prime 10.4 17.3 20.2 22.5 Alt-A 13.3 20.5 40.9 2.8 Total 13.3 20.5 40.8 2.9 (1) Weighted average percentage is based on unpaid principal balance.
Other than Temporary Impairment, Credit Losses Recognized in Earnings	The following table presents the credit-related OTTI, which is recognized in earnings, for the three and nine months ended September 30, 2020 and 2019. Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Balance, beginning of the period $ 990 $ 1,050 $ 1,021 $ 1,077 Additional charges on securities for which OTTI was previously recognized (1) — 2 — 8 Securities matured during the period (2) — (3) — (5) Accretion of yield adjustments resulting from improvement of expected cash flows that are recognized over the remaining life of the securities (3) (14) (15) (45) (46) Balance, end of the period $ 976 $ 1,034 $ 976 $ 1,034 (1) For the three and nine months ended September 30, 2019, “securities for which OTTI was previously recognized” represents all securities that were also other-than-temporarily impaired prior to January 1, 2020. (2) Represents reductions related to securities that, having reached final maturity during the period, are therefore are no longer held by the Bank at the end of the period. (3) The total net accretion/(amortization) associated with PLRMBS that were other-than-temporarily impaired prior to January 1, 2020, (amount recognized in interest income) totaled $17 and $21 for the three months ended September 30, 2020 and 2019, respectively. The total net accretion/(amortization) associated with PLRMBS that were other-than-temporarily impaired prior to January 1, 2020, (amount recognized in interest income) totaled $54 and $58 for the nine months ended September 30, 2020 and 2019, respectively.
Debt Securities, Available-for-sale, Allowance for Credit Loss	The following table presents a rollforward of the allowance for credit losses on investment securities associated with PLRMBS classified as AFS for the three and nine months ended September 30, 2020. The Bank recorded no allowance for credit losses associated with HTM securities during the nine months ended September 30, 2020. Under the previous accounting methodology of security impairment, the Bank recognized credit-related net OTTI loss of $2 and $8 during the three and nine months ended September 30, 2019, respectively. Three Months Ended Nine Months Ended September 30, 2020 September 30, 2020 Balance, beginning of the period $ 29 $ — (Charge-offs)/recoveries (1) (2) Provision for/(reversal of) credit losses (4) 26 Balance, end of the period $ 24 $ 24
Available-for-sale Securities
Debt Instrument [Line Items]
Schedule of Unrealized Loss on Investments	The following tables summarize the AFS securities with unrealized losses as of September 30, 2020, and December 31, 2019. The unrealized losses are aggregated by major security type and the length of time that individual securities have been in a continuous unrealized loss position. At December 31, 2019, total unrealized losses in the following table will not agree to total gross unrealized losses in the table above. The unrealized losses in the following table as of December 31, 2019, also include non-credit-related OTTI losses recognized in AOCI. September 30, 2020 Less Than 12 Months 12 Months or More Total Estimated Unrealized Estimated Unrealized Estimated Unrealized MBS – GSEs – multifamily: Freddie Mac $ 321 $ 1 $ — $ — $ 321 $ 1 Fannie Mae 3,690 26 479 6 4,169 32 Subtotal MBS – GSEs – multifamily 4,011 27 479 6 4,490 33 PLRMBS: Prime 3 — 7 — 10 — Alt-A 206 7 154 15 360 22 Subtotal PLRMBS 209 7 161 15 370 22 Total $ 4,220 $ 34 $ 640 $ 21 $ 4,860 $ 55 December 31, 2019 Less Than 12 Months 12 Months or More Total Estimated Unrealized Estimated Unrealized Estimated Unrealized MBS – GSEs – multifamily: Freddie Mac $ 211 $ — $ — $ — $ 211 $ — Fannie Mae 2,433 9 623 4 3,056 13 Subtotal MBS – GSEs – multifamily 2,644 9 623 4 3,267 13 PLRMBS: Prime 4 — 8 — 12 — Alt-A 75 — 193 9 268 9 Subtotal PLRMBS 79 — 201 9 280 9 Total $ 2,723 $ 9 $ 824 $ 13 $ 3,547 $ 22
Investments Classified by Contractual Maturity Date [Table Text Block]	The amortized cost and estimated fair value of non-MBS investments by contractual maturity (based on contractual final principal payment) and of MBS as of September 30, 2020, and December 31, 2019, are shown below. Expected maturities of MBS will differ from contractual maturities because borrowers may have the right to call or prepay the underlying obligations with or without call or prepayment fees. September 30, 2020 Year of Contractual Maturity Amortized Estimated AFS securities other than MBS: Due in 1 year or less $ 2,924 $ 2,926 Due after 1 year through 5 years 873 875 Subtotal 3,797 3,801 MBS 10,746 10,870 Total $ 14,543 $ 14,671 December 31, 2019 Year of Contractual Maturity Amortized Estimated AFS securities other than MBS: Due in 1 year or less $ 2,309 $ 2,312 Due after 1 year through 5 years 2,972 2,976 Subtotal 5,281 5,288 MBS 9,925 10,207 Total $ 15,206 $ 15,495

Advances (Tables)

Advances (Tables)	9 Months Ended
	Sep. 30, 2020
Federal Home Loan Banks [Abstract]
Federal Home Loan Bank, Advances	The Bank had advances outstanding, excluding overdrawn demand deposit accounts, at interest rates ranging from 0.00% to 8.57% at September 30, 2020, and 1.15% to 8.57% at December 31, 2019, as summarized below. September 30, 2020 December 31, 2019 Redemption Term Amount Outstanding (1) Weighted Amount Outstanding (1) Weighted Overdrawn demand and overnight deposit accounts $ 1 0.01 % $ — — % Within 1 year 13,115 1.29 32,351 1.91 After 1 year through 2 years 12,031 1.65 22,380 2.15 After 2 years through 3 years 2,764 2.16 4,847 2.08 After 3 years through 4 years 3,546 2.48 2,909 2.97 After 4 years through 5 years 3,988 1.38 1,461 2.32 After 5 years 1,445 2.20 1,140 2.96 Total par value 36,890 1.63 % 65,088 2.08 % Valuation adjustments for hedging activities 639 203 Valuation adjustments under fair value option 165 83 Unamortized discounts (1) — Total $ 37,693 $ 65,374 (1) Carrying amounts exclude accrued interest receivable of $7 and $39 at September 30, 2020, and December 31, 2019, respectively. The following table summarizes advances at September 30, 2020, and December 31, 2019, by the earlier of the year of redemption term or next call date for callable advances and by the earlier of the year of redemption term or next put date for putable advances. Earlier of Redemption Earlier of Redemption September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Overdrawn demand and overnight deposit accounts $ 1 $ — $ 1 $ — Within 1 year 15,685 39,075 13,335 32,371 After 1 year through 2 years 9,481 15,731 12,031 22,380 After 2 years through 3 years 2,764 4,800 2,764 4,847 After 3 years through 4 years 3,546 2,895 3,546 2,909 After 4 years through 5 years 3,968 1,447 3,988 1,461 After 5 years 1,445 1,140 1,225 1,120 Total par value $ 36,890 $ 65,088 $ 36,890 $ 65,088 the impact of interest rate exchange agreements associated with these advances for the three and nine months ended September 30, 2020 and 2019. September 30, 2020 Three Months Ended Nine Months Ended Name of Borrower Advances Percentage of Interest (1) Percentage of Interest (1) Percentage of First Republic Bank $ 13,510 37 % $ 62 35 % $ 201 28 % MUFG Union Bank, National Association 4,925 13 36 21 141 19 CIT Bank, National Association 2,550 7 4 2 20 3 First Technology Federal Credit Union 1,975 5 11 6 34 5 Luther Burbank Savings 962 3 5 3 16 2 Subtotal 23,922 65 118 67 412 57 Others 12,968 35 57 33 310 43 Total par value $ 36,890 100 % $ 175 100 % $ 722 100 % September 30, 2019 Three Months Ended Nine Months Ended Name of Borrower Advances Percentage of Interest (1) Percentage of Interest (1) Percentage of MUFG Union Bank, National Association $ 14,100 22 % $ 92 24 % $ 287 22 % First Republic Bank 11,200 18 62 16 175 13 Wells Fargo & Company Wells Fargo Financial National Bank West 8,000 13 49 13 150 12 Wells Fargo Bank, National Association (2) 41 — 1 — 2 — Subtotal Wells Fargo & Company 8,041 13 50 13 152 12 Bank of the West 5,556 9 41 10 124 9 JPMorgan Chase Bank, National Association (2) 5,056 8 33 9 144 11 Subtotal 43,953 70 278 72 882 67 Others 18,486 30 110 28 427 33 Total par value $ 62,439 100 % $ 388 100 % $ 1,309 100 % (1) Interest income amounts exclude the interest effect of interest rate exchange agreements with derivative counterparties; as a result, the total interest income amounts will not agree to the Statements of Income. The amount of interest income from advances can vary depending on the amount outstanding, terms to maturity, interest rates, and repricing characteristics. (2) Nonmember institution. September 30, 2020 December 31, 2019 Par value of advances: Fixed rate: Due within 1 year $ 12,343 $ 15,327 Due after 1 year 20,975 21,337 Total fixed rate 33,318 36,664 Adjustable rate: Due within 1 year 772 17,024 Due after 1 year 2,800 11,400 Total adjustable rate 3,572 28,424 Total par value $ 36,890 $ 65,088 Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Prepayment fees received $ 38 $ — $ 77 $ — Fair value adjustments (35) — (62) 1 Net $ 3 $ — $ 15 $ 1 Advance principal prepaid $ 5,018 $ 775 $ 21,804 $ 3,506

Mortgage Loans Held for Portf_2

Mortgage Loans Held for Portfolio (Tables)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Schedule of Participating Mortgage Loans	The following table presents information as of September 30, 2020, and December 31, 2019, on mortgage loans, all of which are secured by one- to four-unit residential properties and single-unit second homes. September 30, 2020 December 31, 2019 Fixed rate medium-term mortgage loans $ 33 $ 27 Fixed rate long-term mortgage loans 2,338 3,199 Subtotal 2,371 3,226 Unamortized premiums 42 91 Unamortized discounts (2) (3) Mortgage loans held for portfolio (1) 2,411 3,314 Less: Allowance for credit losses (7) — Total mortgage loans held for portfolio, net $ 2,404 $ 3,314
Other Delinquency Statistics	The following tables present the payment status for mortgage loans and other delinquency statistics for Bank’s mortgage loans at September 30, 2020, and December 31, 2019. September 30, 2020 Origination Year Payment Status <2016 2016 to 2020 Amortized Cost (1) 30 – 59 days delinquent $ 19 $ 2 $ 21 60 – 89 days delinquent 16 1 17 90 days or more delinquent 116 10 126 Total past due 151 13 164 Total current loans 2,051 196 2,247 Total MPF (2) $ 2,202 $ 209 $ 2,411 In process of foreclosure, included above (3) $ 1 Nonaccrual loans (2)(4) $ 126 Serious delinquencies as a percentage of total mortgage loans outstanding (2)(5) 5.23 % December 31, 2019 Payment Status Recorded Investment (1) 30 – 59 days delinquent $ 15 60 – 89 days delinquent 2 90 days or more delinquent 7 Total past due 24 Total current loans 3,310 Total MPF $ 3,334 In process of foreclosure, included above (3) $ — Nonaccrual loans $ 7 Serious delinquencies as a percentage of total mortgage loans outstanding (5) 0.22 % (1) With the adoption of new accounting guidance for the measurement of credit losses on financial instruments on January 1, 2020, payment status of mortgage loans is disclosed at amortized cost. The recorded investment at December 31, 2019, in a loan is the unpaid principal balance of the loan, adjusted for accrued interest, net deferred loan fees or costs, unamortized premiums or discounts, and direct write-downs. The recorded investment is not net of any valuation allowance. The amortized cost at September 30, 2020, in a loan is the unpaid principal balance of the loan, adjusted for net deferred loan fees or costs, unamortized premiums or discounts, and direct write-downs. (2) At September 30, 2020, unpaid principal balances of conventional mortgage loans held in portfolio that were in a forbearance plan as a result of the COVID-19 pandemic totaled $143. Of that total, $12 were current, $6 were 30 to 59 days past due, $13 were 60 to 90 days past due, and $112 were greater than 90 days past due and in nonaccrual payment status. The conventional mortgage loans in forbearance represent 6% of the Bank’s mortgage loans held for portfolio at September 30, 2020. (3) Includes loans for which the servicer has reported a decision to foreclose or to pursue a similar alternative, such as deed-in-lieu. Loans in process of foreclosure are included in past due or current loans depending on their delinquency status. (4) At September 30, 2020, $125 of these mortgage loans on nonaccrual status did not have an associated allowance for credit losses. (5) Represents loans that are 90 days or more past due or in the process of foreclosure as a percentage of the recorded investment of total mortgage loans outstanding.
Financing Receivable, Allowance for Credit Loss	The following table presents a rollforward of the allowance for credit losses on the mortgage loan portfolio for the three and nine months ended September 30, 2020. The Bank recorded a de minimis allowance for credit losses on the mortgage loan portfolio for the three and nine months ended September 30, 2019. Three Months Ended Nine Months Ended September 30, 2020 September 30, 2020 Balance, beginning of the period $ 5 $ — Adjustment for cumulative effect of accounting change — 3 Provision for/(reversal of) credit losses 2 4 Balance, end of the period $ 7 $ 7

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2020
Deposits [Abstract]
Schedule of Deposit Liabilities by Component	Deposits and interest rate payment terms for deposits as of September 30, 2020, and December 31, 2019, were as follows:
Schedule of Interest Rate Payment Terms On Deposit Liabilities	September 30, 2020 December 31, 2019 Amount Weighted Amount Weighted Interest-bearing deposits: Adjustable rate $ 816 0.01 % $ 427 1.30 % Fixed rate 20 0.01 — — Total interest-bearing deposits 836 427 Non-interest-bearing deposits 170 110 Total $ 1,006 $ 537

Consolidated Obligations (Table

Consolidated Obligations (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Schedule of Maturities of Long-term Debt	The following is a summary of the Bank’s participation in consolidated obligation bonds at September 30, 2020, and December 31, 2019. September 30, 2020 December 31, 2019 Contractual Maturity Amount Weighted Amount Weighted Within 1 year $ 50,491 0.19 % $ 53,549 1.68 % After 1 year through 2 years 1,798 0.93 13,853 1.67 After 2 years through 3 years 506 1.38 770 1.93 After 3 years through 4 years 357 1.13 135 2.74 After 4 years through 5 years 360 1.46 937 2.08 After 5 years 1,386 2.60 2,126 2.94 Total par value 54,898 0.30 % 71,370 1.73 % Unamortized premiums 8 1 Unamortized discounts (5) (10) Valuation adjustments for hedging activities 18 9 Fair value option valuation adjustments 2 2 Total $ 54,921 $ 71,372
Schedule of Long-term Debt by Call Feature	The Bank’s participation in consolidated obligation bonds at September 30, 2020, and December 31, 2019, was as follows: September 30, 2020 December 31, 2019 Par value of consolidated obligation bonds: Non-callable $ 52,573 $ 65,025 Callable 2,325 6,345 Total par value $ 54,898 $ 71,370
Schedule of Maturities of Long-term Debt by Contractual or Next Call Date	The following is a summary of the Bank’s participation in consolidated obligation bonds outstanding at September 30, 2020, and December 31, 2019, by the earlier of the year of contractual maturity or next call date. Earlier of Contractual September 30, 2020 December 31, 2019 Within 1 year $ 52,366 $ 58,239 After 1 year through 2 years 1,953 12,768 After 2 years through 3 years 451 195 After 3 years through 4 years 77 70 After 4 years through 5 years — 47 After 5 years 51 51 Total par value $ 54,898 $ 71,370
Schedule of Short-term Debt	The Bank’s participation in consolidated obligation discount notes, all of which are due within one year, was as follows: September 30, 2020 December 31, 2019 Amount Weighted Average Interest Rate (1) Amount Weighted Average Interest Rate (1) Par value $ 13,306 0.19 % $ 27,447 1.61 % Unamortized discounts (6) (71) Total $ 13,300 $ 27,376
Schedule of Interest Rate Payment Terms for Debt	Interest rate payment terms for consolidated obligations at September 30, 2020, and December 31, 2019, are detailed in the following table. For information on the general terms and types of consolidated obligations outstanding, see “Item 8. Financial Statements and Supplementary Data – Note 12 – Consolidated Obligations” in the Bank’s 2019 Form 10-K. September 30, 2020 December 31, 2019 Par value of consolidated obligations: Bonds: Fixed rate $ 5,590 $ 10,993 Adjustable rate 49,263 60,117 Step-up 45 60 Step-down — 100 Range bonds — 100 Total bonds, par value 54,898 71,370 Discount notes, par value 13,306 27,447 Total consolidated obligations, par value $ 68,204 $ 98,817

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table summarizes the changes in AOCI for the three months ended September 30, 2020 and 2019: Net Unrealized Gain/(Loss) on AFS Securities Net Non-Credit-Related OTTI Loss on AFS Securities Net Non-Credit-Related OTTI Loss on HTM Securities Pension and Postretirement Benefits Total Balance, June 30, 2019 $ 15 $ 304 $ (2) $ (17) $ 300 Other comprehensive income/(loss) before reclassifications: Non-credit-related OTTI loss (1) — (1) Net change in fair value (17) (15) (32) Net current period other comprehensive income/(loss) (17) (16) — — (33) Balance, September 30, 2019 $ (2) $ 288 $ (2) $ (17) $ 267 Balance, June 30, 2020 $ (21) $ — $ — $ (14) $ (35) Other comprehensive income/(loss) before reclassifications: Net change in pension and postretirement benefits (1) (1) Net change in fair value 172 — 172 Net current period other comprehensive income/(loss) 172 — — (1) 171 Balance, September 30, 2020 $ 151 $ — $ — $ (15) $ 136 The following table summarizes the changes in AOCI for the nine months ended September 30, 2020 and 2019: Net Unrealized Gain/(Loss) on AFS Securities Net Non-Credit-Related OTTI Loss on AFS Securities Net Non-Credit-Related OTTI Loss on HTM Securities Pension and Postretirement Benefits Total Balance, December 31, 2018 $ (32) $ 287 $ (3) $ (17) $ 235 Other comprehensive income/(loss) before reclassifications: Non-credit-related OTTI loss (3) — (3) Net change in fair value 30 1 31 Accretion of non-credit loss 1 1 Reclassification from other comprehensive income/(loss) to net income/(loss): Non-credit-related OTTI to credit-related OTTI 3 — 3 Net current period other comprehensive income/(loss) 30 1 1 — 32 Balance, September 30, 2019 $ (2) $ 288 $ (2) $ (17) $ 267 Balance, December 31, 2019 $ 21 $ 268 $ (1) $ (14) $ 274 Other comprehensive income/(loss) before reclassifications: Net change in pension and postretirement benefits (1) (1) Net change in fair value (138) — (138) Accretion of non-credit loss 1 1 Net current period other comprehensive income/(loss) (138) — 1 (1) (138) Adoption of ASU 2016-13, as amended (1) 268 (268) — Balance, September 30, 2020 $ 151 $ — $ — $ (15) $ 136

Capital (Tables)

Capital (Tables)	9 Months Ended
	Sep. 30, 2020
Banking Regulation, Total Capital [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	As of September 30, 2020, and December 31, 2019, the Bank was in compliance with these capital rules and requirements as shown in the following table. September 30, 2020 December 31, 2019 Required Actual Required Actual Risk-based capital $ 1,403 $ 6,086 $ 1,519 $ 6,605 Total regulatory capital $ 3,035 $ 6,086 $ 4,274 $ 6,605 Total regulatory capital ratio 4.00 % 8.02 % 4.00 % 6.18 % Leverage capital $ 3,793 $ 9,129 $ 5,342 $ 9,908 Leverage ratio 5.00 % 12.03 % 5.00 % 9.27 %
Schedule of Mandatorily Redeemable Capital Stock	The Bank had mandatorily redeemable capital stock totaling $2 outstanding to three institutions at September 30, 2020, and $138 outstanding to three institutions at December 31, 2019. The change in mandatorily redeemable capital stock for three and nine months ended September 30, 2020 and 2019, was as follows: Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Balance at the beginning of the period $ 83 $ 138 $ 138 $ 227 Reclassified from/(to) capital during the period — 4 3 4 Repurchase of excess mandatorily redeemable capital stock (81) (4) (139) (93) Balance at the end of the period $ 2 $ 138 $ 2 $ 138
Schedule of Mandatorily Redeemable Capital Stock by Maturity Date	The following table presents mandatorily redeemable capital stock amounts by contractual redemption period at September 30, 2020, and December 31, 2019. Contractual Redemption Period September 30, 2020 December 31, 2019 Within 1 year $ — $ 135 Past contractual redemption date because of remaining activity (1) 2 3 Total $ 2 $ 138 (1) Represents mandatorily redeemable capital stock that is past the end of the contractual redemption period because of outstanding activity.
Schedule of Concentration of Capital [Table Text Block]	The following table presents the concentration in capital stock held by institutions whose capital stock ownership represented 10% or more of the Bank’s outstanding capital stock, including mandatorily redeemable capital stock, as of September 30, 2020, or December 31, 2019. September 30, 2020 December 31, 2019 Name of Institution Capital Stock Percentage Capital Stock Percentage First Republic Bank $ 419 17 % $ 368 12 % MUFG Union Bank, National Association 153 6 394 12 Subtotal 572 23 762 24 Others 1,895 77 2,376 76 Total $ 2,467 100 % $ 3,138 100 %

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	The following table presents the Bank’s adjusted net interest income by operating segment and reconciles total adjusted net interest income to income before the AHP assessment for the three and nine months ended September 30, 2020 and 2019. Advances- Mortgage- Related Business (1) Adjusted Amortization of Basis Adjustments and (Gain)/Loss on Fair Value Hedges (2) Income/(Expense) on Economic Hedges (3) Interest Expense on Mandatorily Redeemable Capital Stock (4) Net Other Other Income/(Loss) Three months ended: September 30, 2020 $ 50 $ 53 $ 103 $ (13) $ (34) $ 1 $ 149 $ 70 $ 40 $ 179 September 30, 2019 72 60 132 20 (3) 3 112 3 47 68 Nine months ended: September 30, 2020 $ 182 $ 140 $ 322 $ 61 $ (52) $ 5 $ 308 $ 79 $ 119 $ 268 September 30, 2019 237 186 423 54 (8) 11 366 11 138 239 (1) The mortgage-related business includes total accretion or amortization associated with other-than-temporarily impaired PLRMBS, which are recognized in interest income, totaled $17 and $21 for the three months ended September 30, 2020 and 2019; and totaled $54 and $58 for the nine months ended September 30, 2020 and 2019, respectively. The mortgage-related business includes a provision for/(reversal of) credit losses of $(2) and $30 for the three and nine months ended September 30, 2020, respectively. The mortgage-related business does not include credit-related OTTI losses of $2 and $8 for the three and nine months ended September 30, 2019, respectively. (2) Represents amortization of amounts deferred for adjusted net interest income purposes only and changes in fair value of the derivative hedging instrument and the hedged item attributable to the hedged risk for designated fair value hedges recorded in net interest income. (3) The Bank includes income and expense associated with net settlements from economic hedges in adjusted net interest income in its analysis of financial performance for its two operating segments. For financial reporting purposes, the Bank does not include these amounts in net interest income in the Statements of Income, but instead records them in other income in “Net gain/(loss) on derivatives and hedging activities.” (4) The Bank excludes interest expense on mandatorily redeemable capital stock from adjusted net interest income in its analysis of financial performance for its two operating segments.
Schedule of Segment Assets by Segment	The following table presents total assets by operating segment at September 30, 2020, and December 31, 2019. Advances- Mortgage- Total September 30, 2020 $ 56,829 $ 19,041 $ 75,870 December 31, 2019 85,709 21,133 106,842

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table summarizes the notional amount and fair value of derivative instruments, including the effect of netting adjustments and cash collateral as of September 30, 2020, and December 31, 2019. For purposes of this disclosure, the derivative values include the fair value of derivatives and related accrued interest. September 30, 2020 December 31, 2019 Notional Derivative Derivative Notional Derivative Derivative Derivatives designated as hedging instruments: Interest rate swaps $ 38,608 $ 48 $ 303 $ 39,622 $ 31 $ 370 Total 38,608 48 303 39,622 31 370 Derivatives not designated as hedging instruments: Interest rate swaps 40,937 10 27 60,424 13 14 Interest rate caps and floors 980 — — 980 — — Mortgage delivery commitments 6 — — 46 — — Total 41,923 10 27 61,450 13 14 Total derivatives before netting and collateral adjustments $ 80,531 58 330 $ 101,072 44 384 Netting adjustments and cash collateral (1) (2) (329) (11) (384) Total derivative assets and total derivative liabilities $ 56 $ 1 $ 33 $ — (1) Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral, including accrued interest, held or placed with the same clearing agents and/or counterparty. Cash collateral posted, including accrued interest, was $335 and $378 at September 30, 2020, and December 31, 2019, respectively. Cash collateral received, including accrued interest, was $8 and $5 at September 30, 2020, and December 31, 2019, respectively.
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	The following table presents the components of net gain/(loss) on derivatives and hedging activities as presented in the Statements of Income for the three and nine months ended September 30, 2020 and 2019. Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Derivatives not designated as hedging instruments Gain/(Loss) Gain/(Loss) Gain/(Loss) Gain/(Loss) Economic hedges: Interest rate swaps $ 39 $ (17) $ (107) $ (102) Interest rate caps and floors — (1) — (2) Net settlements (34) (3) (52) (8) Mortgage delivery commitments — 1 3 3 Net gain/(loss) on derivatives and hedging activities $ 5 $ (20) $ (156) $ (109)
Derivative Instruments, Gain (Loss) [Table Text Block]	The following tables present, by type of hedged item, the gains and losses on fair value hedging relationships and the impact of those derivatives on the Bank’s Statements of Income for the three and nine months ended September 30, 2020 and 2019. Three Months Ended September 30, 2020 Interest Income/(Expense) Advances AFS Securities Consolidated Obligation Bonds Total interest income/(expense) presented in the Statements of Income $ 88 $ 67 $ (47) Gain/(loss) on fair value hedging relationships Derivatives (1) $ 22 $ 54 $ (1) Hedged items (112) (112) 8 Net gain/(loss) on fair value hedging relationships $ (90) $ (58) $ 7 Three Months Ended September 30, 2019 Interest Income/(Expense) Advances AFS Securities Consolidated Obligation Bonds Total interest income/(expense) presented in the Statements of Income $ 389 $ 100 $ (409) Gain/(loss) on fair value hedging relationships Derivatives (1) $ (36) $ (224) $ 2 Hedged items 37 209 (4) Net gain/(loss) on fair value hedging relationships $ 1 $ (15) $ (2) Nine Months Ended September 30, 2020 Interest Income/(Expense) Advances AFS Securities Consolidated Obligation Bonds Total interest income/(expense) presented in the Statements of Income $ 509 $ 179 $ (405) Gain/(loss) on fair value hedging relationships Derivatives (1) $ (715) $ (995) $ 27 Hedged items 486 803 (9) Net gain/(loss) on fair value hedging relationships $ (229) $ (192) $ 18 Nine Months Ended September 30, 2019 Interest Income/(Expense) Advances AFS Securities Consolidated Obligation Bonds Total interest income/(expense) presented in the Statements of Income $ 1,343 $ 261 $ (1,306) Gain/(loss) on fair value hedging relationships Derivatives (1) $ (292) $ (594) $ 43 Hedged items 325 552 (61) Net gain/(loss) on fair value hedging relationships $ 33 $ (42) $ (18) (1) Includes net interest settlements.
Schedule of Derivative Instruments By Type, Gain (Loss) in Statement of Financial Performance	The following tables present the cumulative basis adjustments on hedged items designated as fair value hedges and the related amortized cost of the hedged items as of September 30, 2020, and December 31, 2019. September 30, 2020 December 31, 2019 Advances AFS Securities Consolidated Obligation Bonds Advances AFS Securities Consolidated Obligation Bonds Amortized cost of hedged asset/(liability) (1) $ 25,815 $ 12,541 $ (2,541) $ 22,900 $ 12,877 $ (4,840) Fair value hedging basis adjustments: Active hedging relationships included in amortized cost $ 619 $ 318 $ (19) $ 204 $ 431 $ (9) Discontinued hedging relationships included in amortized cost 20 916 — — — — Total amount of fair value hedging basis adjustments $ 639 $ 1,234 $ (19) $ 204 $ 431 $ (9) (1) Includes only the portion of amortized cost representing the hedged items in fair value hedging relationships.
Schedule of Derivative Instruments, Offsetting Derivative Assets	The following tables present separately the fair value of derivative assets and derivative liabilities that have met the netting requirements, including the related collateral received from or pledged to counterparties as of September 30, 2020, and December 31, 2019. September 30, 2020 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Total Derivative Assets and Total Derivative Liabilities Noncash Collateral Not Offset That Net Amount Derivative Assets Uncleared $ 33 $ 7 $ 40 $ — $ 40 Cleared 25 (9) 16 (386) 402 Total $ 56 $ 442 Derivative Liabilities Uncleared $ 315 $ (314) $ 1 $ — $ 1 Cleared 15 (15) — — — Total $ 1 $ 1 December 31, 2019 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Total Derivative Assets and Total Derivative Liabilities Noncash Collateral Not Offset That Net Amount Derivative Assets Uncleared $ 34 $ (16) $ 18 $ — $ 18 Cleared 10 5 15 (381) 396 Total $ 33 $ 414 Derivative Liabilities Uncleared $ 382 $ (382) $ — $ — $ — Cleared 2 (2) — — — Total $ — $ —
Schedule of Derivative Instruments, Offsetting Derivative Liabilities	The following tables present separately the fair value of derivative assets and derivative liabilities that have met the netting requirements, including the related collateral received from or pledged to counterparties as of September 30, 2020, and December 31, 2019. September 30, 2020 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Total Derivative Assets and Total Derivative Liabilities Noncash Collateral Not Offset That Net Amount Derivative Assets Uncleared $ 33 $ 7 $ 40 $ — $ 40 Cleared 25 (9) 16 (386) 402 Total $ 56 $ 442 Derivative Liabilities Uncleared $ 315 $ (314) $ 1 $ — $ 1 Cleared 15 (15) — — — Total $ 1 $ 1 December 31, 2019 Derivative Instruments Meeting Netting Requirements Amount Recognized Gross Amount of Netting Adjustments and Cash Collateral Total Derivative Assets and Total Derivative Liabilities Noncash Collateral Not Offset That Net Amount Derivative Assets Uncleared $ 34 $ (16) $ 18 $ — $ 18 Cleared 10 5 15 (381) 396 Total $ 33 $ 414 Derivative Liabilities Uncleared $ 382 $ (382) $ — $ — $ — Cleared 2 (2) — — — Total $ — $ —

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	The following tables present the net carrying value or carrying value, as applicable, the estimated fair value, and the fair value hierarchy level of the Bank’s financial instruments at September 30, 2020, and December 31, 2019. The Bank records trading securities, AFS securities, derivative assets, derivative liabilities, certain advances, certain consolidated obligations, and certain other assets at fair value on a recurring basis, and on occasion certain mortgage loans held for portfolio and certain other assets at fair value on a nonrecurring basis. The Bank records all other financial assets and liabilities at amortized cost. Refer to the following tables for further details about the financial assets and liabilities held at fair value on either a recurring or non-recurring basis. September 30, 2020 Net Carrying Estimated Fair Value Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets Cash and due from banks $ 175 $ 175 $ 175 $ — $ — $ — Interest-bearing deposits 1,478 1,478 1,478 — — — Securities purchased under agreements to resell 6,750 6,750 — 6,750 — — Federal funds sold 2,323 2,323 — 2,323 — — Trading securities 4,281 4,281 — 4,281 — — AFS securities 14,671 14,671 — 12,535 2,136 — HTM securities 5,718 5,755 — 5,444 311 — Advances 37,693 37,887 — 37,887 — — Mortgage loans held for portfolio, net of allowance for credit losses on mortgage loans 2,404 2,418 — 2,418 — — Accrued interest receivable 100 100 — 100 — — Derivative assets, net (1) 56 56 — 58 — (2) Other assets (2) 20 20 20 — — — Liabilities Deposits 1,006 1,006 — 1,006 — — Consolidated obligations: Bonds 54,921 54,984 — 54,984 — — Discount notes 13,300 13,302 — 13,302 — — Total consolidated obligations 68,221 68,286 — 68,286 — — Mandatorily redeemable capital stock 2 2 2 — — — Accrued interest payable 31 31 — 31 — — Derivative liabilities, net (1) 1 1 — 330 — (329) Other Standby letters of credit 33 33 — 33 — — December 31, 2019 Carrying Estimated Fair Value Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets Cash and due from banks $ 118 $ 118 $ 118 $ — $ — $ — Interest-bearing deposits 2,269 2,269 2,269 — — — Securities purchased under agreements to resell 7,000 7,000 — 7,000 — — Federal funds sold 3,562 3,562 — 3,562 — — Trading securities 1,766 1,766 — 1,766 — — AFS securities 15,495 15,495 — 12,898 2,597 — HTM securities 7,545 7,566 — 7,181 385 — Advances 65,374 65,492 — 65,492 — — Mortgage loans held for portfolio, net of allowance for credit losses on mortgage loans 3,314 3,332 — 3,332 — — Accrued interest receivable 139 139 — 139 — — Derivative assets, net (1) 33 33 — 44 — (11) Other assets (2) 19 19 19 — — — Liabilities Deposits 537 537 — 537 — — Consolidated obligations: Bonds 71,372 71,386 — 71,386 — — Discount notes 27,376 27,378 — 27,378 — — Total consolidated obligations 98,748 98,764 — 98,764 — — Mandatorily redeemable capital stock 138 138 138 — — — Accrued interest payable 164 164 — 164 — — Derivative liabilities, net (1) — — — 384 — (384) Other Standby letters of credit 32 32 — 32 — — (1) 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. (2) Represents publicly traded mutual funds held in a grantor trust.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques	The following tables present the fair value of assets and liabilities, which are recorded on a recurring or nonrecurring basis at September 30, 2020, and December 31, 2019, by level within the fair value hierarchy. September 30, 2020 Fair Value Measurement Using: Netting Adjustments and Cash Collateral (1) Level 1 Level 2 Level 3 Total Recurring fair value measurements – Assets: Trading securities: U.S. obligations – Treasury securities $ — $ 4,278 $ — $ — $ 4,278 MBS – Other U.S. obligations – Ginnie Mae — 3 — — 3 Total trading securities — 4,281 — — 4,281 AFS securities: U.S. obligations – Treasury securities — 3,801 — — 3,801 MBS: GSEs – multifamily — 8,734 — — 8,734 PLRMBS — — 2,136 — 2,136 Subtotal MBS — 8,734 2,136 — 10,870 Total AFS securities — 12,535 2,136 — 14,671 Advances (2) — 3,103 — — 3,103 Derivative assets, net: interest rate-related — 58 — (2) 56 Other assets 20 — — — 20 Total recurring fair value measurements – Assets $ 20 $ 19,977 $ 2,136 $ (2) $ 22,131 Recurring fair value measurements – Liabilities: Consolidated obligation bonds (3) $ — $ 112 $ — $ — $ 112 Derivative liabilities, net: interest rate-related — 330 — (329) 1 Total recurring fair value measurements – Liabilities $ — $ 442 $ — $ (329) $ 113 Nonrecurring fair value measurements – Assets: (4) Impaired mortgage loans held for portfolio $ — $ — $ 24 $ — $ 24 Total nonrecurring fair value measurements – Assets $ — $ — $ 24 $ — $ 24 December 31, 2019 Fair Value Measurement Using: Netting Adjustments and Cash Collateral (1) Level 1 Level 2 Level 3 Total Recurring fair value measurements – Assets: Trading securities: U.S. obligations – Treasury securities $ — $ 1,762 $ — $ — $ 1,762 MBS – Other U.S. obligations – Ginnie Mae — 4 — — 4 Total trading securities — 1,766 — — 1,766 AFS securities: U.S. obligations – Treasury securities — 5,288 — — 5,288 MBS: GSEs – multifamily — 7,610 — — 7,610 PLRMBS — — 2,597 — 2,597 Subtotal MBS — 7,610 2,597 — 10,207 Total AFS securities — 12,898 2,597 — 15,495 Advances (2) — 4,370 — — 4,370 Derivative assets, net: interest rate-related — 44 — (11) 33 Other assets 19 — — — 19 Total recurring fair value measurements – Assets $ 19 $ 19,078 $ 2,597 $ (11) $ 21,683 Recurring fair value measurements – Liabilities: Consolidated obligation bonds (3) $ — $ 337 $ — $ — $ 337 Derivative liabilities, net: interest rate-related — 384 — (384) — Total recurring fair value measurements – Liabilities $ — $ 721 $ — $ (384) $ 337 Nonrecurring fair value measurements – Assets: (4) Impaired mortgage loans held for portfolio $ — $ — $ 1 $ — $ 1 Total nonrecurring fair value measurements – Assets $ — $ — $ 1 $ — $ 1 (1) 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. (2) Represents advances recorded under the fair value option at September 30, 2020, and December 31, 2019. (3) Represents consolidated obligation bonds recorded under the fair value option at September 30, 2020, and December 31, 2019. (4) The fair value information presented is as of the date the fair value adjustment was recorded during the nine months ended September 30, 2020, and the year ended December 31, 2019.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following tables present a reconciliation of the Bank’s AFS PLRMBS that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2020 and 2019. Three Months Ended September 30, 2020 September 30, 2019 Balance, beginning of the period $ 2,225 $ 2,929 Total gain/(loss) realized and unrealized included in: Interest income 17 20 (Provision for)/reversal of credit losses 4 — Other income, net — (3) Unrealized gain/(loss) included in AOCI 29 (15) Settlements (139) (176) Balance, end of the period $ 2,136 $ 2,755 Total amount of gain/(loss) for the period included in earnings attributable to the change in unrealized gains/losses relating to assets and liabilities still held at the end of the period $ 20 $ 16 Nine Months Ended September 30, 2020 September 30, 2019 Balance, beginning of the period $ 2,597 $ 3,157 Total gain/(loss) realized and unrealized included in: Interest income 53 57 (Provision for)/reversal of credit losses (26) — Other income, net — (8) Unrealized gain/(loss) included in AOCI (111) 1 Settlements (378) (452) Transfers of HTM securities to AFS securities 1 — Balance, end of the period $ 2,136 $ 2,755 Total amount of gain/(loss) for the period included in earnings attributable to the change in unrealized gains/losses relating to assets and liabilities still held at the end of the period $ 27 $ 46
Fair Value, Option, Quantitative Disclosures	The following tables summarize the activity related to financial assets and liabilities for which the Bank elected the fair value option during the three and nine months ended September 30, 2020 and 2019: Three Months Ended September 30, 2020 September 30, 2019 Advances Consolidated Advances Consolidated Balance, beginning of the period $ 3,478 $ 128 $ 4,529 $ 943 Maturities and terminations (367) (15) (583) (365) Net gain/(loss) on advances and net (gain)/loss on consolidated obligation bonds from changes in fair value recognized in earnings (8) (1) 22 2 Change in accrued interest — — (1) (3) Balance, end of the period $ 3,103 $ 112 $ 3,967 $ 577 Nine Months Ended September 30, 2020 September 30, 2019 Advances Consolidated Advances Consolidated Balance, beginning of the period $ 4,370 $ 337 $ 5,133 $ 2,019 New transactions elected for fair value option 7,070 — 74 — Maturities and terminations (8,432) (225) (1,363) (1,448) Net gain/(loss) on advances and net (gain)/loss on consolidated obligation bonds from changes in fair value recognized in earnings 97 1 125 14 Change in accrued interest (2) (1) (2) (8) Balance, end of the period $ 3,103 $ 112 $ 3,967 $ 577 The following table presents the difference between the aggregate remaining contractual principal balance outstanding and aggregate fair value of advances and consolidated obligation bonds for which the Bank elected the fair value option at September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Principal Balance Fair Value Fair Value Principal Balance Fair Value Fair Value Advances (1) $ 2,938 $ 3,103 $ 165 $ 4,287 $ 4,370 $ 83 Consolidated obligation bonds 110 112 2 335 337 2

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Off-Balance Sheet Commitments	Off-balance sheet commitments as of September 30, 2020, and December 31, 2019, were as follows: September 30, 2020 December 31, 2019 Expire Within Expire After Total Expire Within Expire After Total Standby letters of credit outstanding $ 12,980 $ 4,723 $ 17,703 $ 16,898 $ 4,658 $ 21,556 Commitments to issue consolidated obligation discount notes, par — — — 805 — 805 Commitments to issue consolidated obligation bonds, par 170 — 170 — — — Commitments to purchase mortgage loans 6 — 6 46 — 46

Transactions with Certain Membe

Transactions with Certain Members, Certain Nonmembers, and Other FHLBanks (Tables)	9 Months Ended
	Sep. 30, 2020
Related Party Transactions [Abstract]
Transactions with Certain Members and Nonmembers	The following tables set forth information at the dates and for the periods indicated with respect to transactions with members that have an officer or director serving on the Bank’s Board of Directors. September 30, 2020 December 31, 2019 Assets: Advances $ 3,514 $ 3,697 Mortgage loans held for portfolio — 8 Accrued interest receivable 5 6 Liabilities: Deposits $ 26 $ 22 Capital: Capital Stock $ 129 $ 132 Three Months Ended Nine Months Ended September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Interest Income: Advances $ 19 $ 22 $ 59 $ 66

Basis of Presentation (Details)

Basis of Presentation (Details) $ in Millions	Jul. 31, 2020USD ($)
Accounting Policies [Abstract]
Gain on disgorgement settlement	$ 85

Investments Narrative (Details)

Investments Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Investments [Line Items]
Interest-Bearing Deposits, Securities Purchased Under Agreements to Resell, and Federal Funds Sold, Percentage Unrated	0.00%		0.00%
Interest-Bearing Deposits, Securities Purchased Under Agreements to Resell, and Federal Funds Sold, Percentage Rated Below Triple-B	0.00%		0.00%
Available-for-sale Securities, Premiums	$ 67		$ 67			$ 65
Available for sale Securities Discounts	(48)		(48)			(52)
Credit-related OTTI	976	$ 1,034	976	$ 1,034	$ 990	1,021	$ 1,050	$ 1,077
Provision for/(reversal of) credit loss	$ (2)	0	$ 30	0
Net OTTI loss, credit-related		$ 2		$ 8
Available For Sale Debt Securities And Held To Maturity Debt Securities Excluding Private Label Mortgage Back Securities Amortized Cost Percentage Rated Single A Or Above	100.00%		100.00%
Available-for-Sale Debt Securities and Held-to-Maturity Debt Securities Private Label Mortgage Back Securities Amortized Cost, Percentage Rated Single-A Or Above	6.00%		6.00%
Interest-bearing Deposits [Member]
Investments [Line Items]
Accrued Interest, after Allowance for Credit Loss	$ 0		$ 0			3
Fed Funds Sold
Investments [Line Items]
Accrued Interest, after Allowance for Credit Loss	0		0			0
Securities Borrowed or Purchased under Agreements to Resell [Member]
Investments [Line Items]
Accrued Interest, after Allowance for Credit Loss	0		0			0
Mortgage Backed Securities
Investments [Line Items]
Held-to-maturity Securities, Premiums	5		5			8
Held-to-maturity Securities, Discounts	(7)		(7)			(11)
Available-for-sale Securities | Mortgage Backed Securities
Investments [Line Items]
Credit-related OTTI	506		506			574
Held-to-maturity Securities | Mortgage Backed Securities
Investments [Line Items]
Credit-related OTTI	$ 6		$ 6			$ 7

Investments Trading Securities

Investments Trading Securities by Major Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Trading Securities
Trading securities	$ 4,281		$ 4,281		$ 1,766
Net unrealized gain/(loss) on trading securities	(19)	$ 0	36	$ (1)
US Treasury Securities [Member]
Trading Securities
Trading securities	4,278		4,278		1,762
MBS – Other U.S. obligations – Ginnie Mae
Trading Securities
Trading securities	$ 3		$ 3		$ 4

Investments AFS Securities by M

Investments AFS Securities by Major Type (Details) - USD ($) $ in Millions		Sep. 30, 2020		Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS	[1]	$ 14,543			$ 15,206
Allowance for Credit Losses		(24)		$ (29)	0
OTTI recognized in AOCI	[2]				(9)
Gross Unrealized Gains		207			311	[3]
Gross Unrealized Losses		(55)			(13)
Available-for-sale (AFS) securities	[4]	14,671			15,495
Available-for-Sale, Accrued Interest, after Allowance for Credit Loss		48			58
Subsequent Unrealized Gains in Fair Value of Previously OTTI Impaired AFS					277
Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS	[1]	10,746			9,925
Allowance for Credit Losses		(24)
OTTI recognized in AOCI	[2]				(9)
Gross Unrealized Gains		203			304	[3]
Gross Unrealized Losses		(55)			(13)
Available-for-sale (AFS) securities		10,870			10,207
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS		3,797	[1]		5,281
Allowance for Credit Losses		0
OTTI recognized in AOCI					0
Gross Unrealized Gains		4			7	[3]
Gross Unrealized Losses		0			0
Available-for-sale (AFS) securities		3,801			5,288
Multifamily [Member] | MBS - GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS	[1]	8,745			7,596
Allowance for Credit Losses		0
OTTI recognized in AOCI					0
Gross Unrealized Gains		22			27	[3]
Gross Unrealized Losses		(33)			(13)
Available-for-sale (AFS) securities		8,734			7,610
Freddie Mac | Multifamily [Member] | MBS - GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS		851	[1]		773
Allowance for Credit Losses		0
OTTI recognized in AOCI					0
Gross Unrealized Gains		3			4	[3]
Gross Unrealized Losses		(1)			0
Available-for-sale (AFS) securities		853			777
Fannie Mae | Multifamily [Member] | MBS - GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS		7,894	[1]		6,823
Allowance for Credit Losses		0
OTTI recognized in AOCI					0
Gross Unrealized Gains		19			23	[3]
Gross Unrealized Losses		(32)			(13)
Available-for-sale (AFS) securities		7,881			6,833
Residential Mortgage Backed Securities [Member] | PLRMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS	[1]	2,001			2,329
Allowance for Credit Losses		(24)
OTTI recognized in AOCI	[2]				(9)
Gross Unrealized Gains		181			277	[3]
Gross Unrealized Losses		(22)			0
Available-for-sale (AFS) securities		2,136			2,597
Residential Mortgage Backed Securities [Member] | Prime | PLRMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS		180			213
Allowance for Credit Losses		(2)
OTTI recognized in AOCI					0
Gross Unrealized Gains		10			17	[3]
Gross Unrealized Losses		0			0
Available-for-sale (AFS) securities		188			230
Residential Mortgage Backed Securities [Member] | Alt-A | PLRMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS		1,821			2,116
Allowance for Credit Losses		(22)
OTTI recognized in AOCI	[2]				(9)
Gross Unrealized Gains		171			260	[3]
Gross Unrealized Losses		(22)			0
Available-for-sale (AFS) securities		$ 1,948			$ 2,367
[1]	Amortized cost includes unpaid principal balance, unamortized premiums and discounts, net charge-offs, and valuation adjustments for hedging activities, and excludes accrued interest receivable of $48 and $58 at September 30, 2020, and December 31, 2019, respectively.
[2]	Effective January 1, 2020, the Bank completes an analysis on a quarterly basis to determine whether to record an allowance for credit losses for expected credit losses on AFS securities. Prior to January 1, 2020, credit losses were recorded as a direct write-down to the AFS security carrying value. OTTI recognized in AOCI excludes subsequent unrealized gains/(losses) in fair value of previously other-than-temporarily impaired AFS securities at December 31, 2019, which is included in net non-credit-related OTTI on AFS securities.
[3]	Includes $277 in subsequent unrealized gains in fair value of previously other-than-temporarily impaired AFS securities at December 31, 2019.
[4]	At September 30, 2020, $386 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.

Investments Summary of AFS Secu

Investments Summary of AFS Securities with Unrealized Losses (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months: Estimated Fair Value	$ 4,220	$ 2,723
Less Than 12 Months: Unrealized Losses	34	9
12 Months or More: Estimated Fair Value	640	824
12 Months or More: Unrealized Losses	21	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,860	3,547
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	55	22
Multifamily [Member] | MBS - GSEs
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months: Estimated Fair Value	4,011	2,644
Less Than 12 Months: Unrealized Losses	27	9
12 Months or More: Estimated Fair Value	479	623
12 Months or More: Unrealized Losses	6	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,490	3,267
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	33	13
Freddie Mac | Multifamily [Member] | MBS - GSEs
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months: Estimated Fair Value	321	211
Less Than 12 Months: Unrealized Losses	1	0
12 Months or More: Estimated Fair Value	0	0
12 Months or More: Unrealized Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	321	211
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1	0
Fannie Mae | Multifamily [Member] | MBS - GSEs
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months: Estimated Fair Value	3,690	2,433
Less Than 12 Months: Unrealized Losses	26	9
12 Months or More: Estimated Fair Value	479	623
12 Months or More: Unrealized Losses	6	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,169	3,056
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	32	13
PLRMBS | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months: Estimated Fair Value	209	79
Less Than 12 Months: Unrealized Losses	7	0
12 Months or More: Estimated Fair Value	161	201
12 Months or More: Unrealized Losses	15	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	370	280
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	22	9
Prime | PLRMBS | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months: Estimated Fair Value	3	4
Less Than 12 Months: Unrealized Losses	0	0
12 Months or More: Estimated Fair Value	7	8
12 Months or More: Unrealized Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	10	12
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	0
Alt-A | PLRMBS | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less Than 12 Months: Estimated Fair Value	206	75
Less Than 12 Months: Unrealized Losses	7	0
12 Months or More: Estimated Fair Value	154	193
12 Months or More: Unrealized Losses	15	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	360	268
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 22	$ 9

Investments AFS by Contractual

Investments AFS by Contractual Maturity (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS	[1]	$ 14,543	$ 15,206
Available-for-sale (AFS) securities	[2]	14,671	15,495
Non Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Due in 1 year or less - Amortized cost		2,924	2,309
Due in 1 year or less - Fair value		2,926	2,312
Due after 1 year through 5 years - Amortized cost		873	2,972
Due after 1 year through 5 years - Fair value		875	2,976
Amortized Cost of AFS		3,797	5,281
Available-for-sale (AFS) securities		3,801	5,288
Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost of AFS	[1]	10,746	9,925
Available-for-sale (AFS) securities		$ 10,870	$ 10,207
[1]	Amortized cost includes unpaid principal balance, unamortized premiums and discounts, net charge-offs, and valuation adjustments for hedging activities, and excludes accrued interest receivable of $48 and $58 at September 30, 2020, and December 31, 2019, respectively.
[2]	At September 30, 2020, $386 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.

Investments Classification of H

Investments Classification of Held-to-Maturity Securities (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		$ 5,718	$ 7,546
OTTI Recognized in AOCI			(1)
HTM securities, Carrying Value	[1]	5,718	7,545
Gross Unrecognized Holding Gain		52	40
Gross Unrecognized Holding Loss		(15)	(19)
Fair Value of Held-to-maturity securities		5,755	7,566
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss		5	12
Single Family, Mortgage-backed Securities, Other US Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		319	470
OTTI Recognized in AOCI			0
HTM securities, Carrying Value			470
Gross Unrecognized Holding Gain		9	5
Gross Unrecognized Holding Loss		0	0
Fair Value of Held-to-maturity securities		328	475
MBS - GSEs
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		5,083	6,691
OTTI Recognized in AOCI			0
HTM securities, Carrying Value			6,691
Gross Unrecognized Holding Gain		39	28
Gross Unrecognized Holding Loss		(6)	(13)
Fair Value of Held-to-maturity securities		5,116	6,706
Single Family [Member] | MBS - GSEs
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		2,027	2,907
OTTI Recognized in AOCI			0
HTM securities, Carrying Value			2,907
Gross Unrecognized Holding Gain		38	28
Gross Unrecognized Holding Loss		(1)	(2)
Fair Value of Held-to-maturity securities		2,064	2,933
Single Family [Member] | Freddie Mac | MBS - GSEs
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		654	1,063
OTTI Recognized in AOCI			0
HTM securities, Carrying Value			1,063
Gross Unrecognized Holding Gain		14	8
Gross Unrecognized Holding Loss		0	(1)
Fair Value of Held-to-maturity securities		668	1,070
Single Family [Member] | Fannie Mae | MBS - GSEs
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		1,373	1,844
OTTI Recognized in AOCI			0
HTM securities, Carrying Value			1,844
Gross Unrecognized Holding Gain		24	20
Gross Unrecognized Holding Loss		(1)	(1)
Fair Value of Held-to-maturity securities		1,396	1,863
Multifamily [Member] | MBS - GSEs
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		3,056	3,784
OTTI Recognized in AOCI			0
HTM securities, Carrying Value			3,784
Gross Unrecognized Holding Gain		1	0
Gross Unrecognized Holding Loss		(5)	(11)
Fair Value of Held-to-maturity securities		3,052	3,773
Multifamily [Member] | Freddie Mac | MBS - GSEs
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		2,110	2,625
OTTI Recognized in AOCI			0
HTM securities, Carrying Value			2,625
Gross Unrecognized Holding Gain		1	0
Gross Unrecognized Holding Loss		(3)	(9)
Fair Value of Held-to-maturity securities		2,108	2,616
Multifamily [Member] | Fannie Mae | MBS - GSEs
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		946	1,159
OTTI Recognized in AOCI			0
HTM securities, Carrying Value			1,159
Gross Unrecognized Holding Gain		0	0
Gross Unrecognized Holding Loss		(2)	(2)
Fair Value of Held-to-maturity securities		944	1,157
Residential Mortgage Backed Securities [Member] | PLRMBS
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		316	385
OTTI Recognized in AOCI			(1)
HTM securities, Carrying Value			384
Gross Unrecognized Holding Gain		4	7
Gross Unrecognized Holding Loss		(9)	(6)
Fair Value of Held-to-maturity securities		311	385
Residential Mortgage Backed Securities [Member] | Prime | PLRMBS
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		203	243
OTTI Recognized in AOCI			0
HTM securities, Carrying Value			243
Gross Unrecognized Holding Gain		0	1
Gross Unrecognized Holding Loss		(6)	(4)
Fair Value of Held-to-maturity securities		197	240
Residential Mortgage Backed Securities [Member] | Alt-A | PLRMBS
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		113	142
OTTI Recognized in AOCI			(1)
HTM securities, Carrying Value			141
Gross Unrecognized Holding Gain		4	6
Gross Unrecognized Holding Loss		(3)	(2)
Fair Value of Held-to-maturity securities		$ 114	$ 145
[1]	At September 30, 2020, and December 31, 2019, none of these securities were pledged as collateral that may be repledged.

Investments Allowance for Credi

Investments Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses	$ 24	$ 24	$ 29	$ 0
(Charge-offs)/recoveries	(1)	(2)
Provision for/(reversal of) credit losses	$ (4)	$ 26

Investments Significant Inputs

Investments Significant Inputs on PLRMBS (Details)	9 Months Ended
	Sep. 30, 2020
Significant Inputs on PLRMBS [Line Items]
Prepayment Weighted Average	13.30%
Default Rate Weighted Average	20.50%
Loss Severity Weighted Average	40.80%
Credit Enhancements Weighted Average	2.90%
Alt-A | Residential Mortgage Backed Securities [Member]
Significant Inputs on PLRMBS [Line Items]
Prepayment Weighted Average	13.30%
Default Rate Weighted Average	20.50%
Loss Severity Weighted Average	40.90%
Credit Enhancements Weighted Average	2.80%
Prime | Residential Mortgage Backed Securities [Member]
Significant Inputs on PLRMBS [Line Items]
Prepayment Weighted Average	10.40%
Default Rate Weighted Average	17.30%
Loss Severity Weighted Average	20.20%
Credit Enhancements Weighted Average	22.50%

Investments OTTI Rollforward (D

Investments OTTI Rollforward (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Credit-related OTTI		$ 976	$ 1,034	$ 976	$ 1,034	$ 990	$ 1,021	$ 1,050	$ 1,077
Additional charges on securities for which OTTI was previously recognized	[1]	0	2	0	8
Securities matured during the period	[2]	0	(3)	0	(5)
Accretion of yield adjustments resulting from improvement of expected cash flows that are recognized over the remaining life of the securities	[3]	(14)	(15)	(45)	(46)
OTTI, Credit Losses Recognized in Earnings, Total accretion or amortization		$ 17	$ 21	$ 54	$ 58
[1]	For the three and nine months ended September 30, 2019, “securities for which OTTI was previously recognized” represents all securities that were also other-than-temporarily impaired prior to January 1, 2020
[2]	Represents reductions related to securities that, having reached final maturity during the period, are therefore are no longer held by the Bank at the end of the period
[3]	The total net accretion/(amortization) associated with PLRMBS that were other-than-temporarily impaired prior to January 1, 2020, (amount recognized in interest income) totaled $17 and $21 for the three months ended September 30, 2020 and 2019, respectively. The total net accretion/(amortization) associated with PLRMBS that were other-than-temporarily impaired prior to January 1, 2020, (amount recognized in interest income) totaled $54 and $58 for the nine months ended September 30, 2020 and 2019, respectively

Advances (Narrative) (Details)

Advances (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Advances [Line Items]
Advances, Par Value	$ 36,890	$ 65,088	$ 62,439
Federal Home Loan Bank Advances with Full prepayment Symmetry Outstanding	21,195	14,059
Advances With Partial Prepayment Symmetry Outstanding	$ 2,738	$ 3,513
Minimum
Advances [Line Items]
Advances, Maturity Period, Fixed Rate	1 day
Advances, Maturity Period, Variable Rate	30 days
Advances, Interest Rate	0.00%	1.15%
Maximum
Advances [Line Items]
Advances, Maturity Period, Fixed Rate	30 years
Advances, Maturity Period, Variable Rate	10 years
Advances, Interest Rate	8.57%	8.57%
Advances, Callable Option
Advances [Line Items]
Advances, Par Value	$ 2,670	$ 14,024
Advances, Putable Option
Advances [Line Items]
Advances, Par Value	$ 220	$ 20

Advances (Redemption Terms) (De

Advances (Redemption Terms) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Federal Home Loan Bank Advances, Maturities [Abstract]
Overdrawn demand and overnight deposit accounts		$ 1	$ 0
Within 1 year		13,115	32,351
After 1 year through 2 years		12,031	22,380
After 2 years through 3 years		2,764	4,847
After 3 years through 4 years		3,546	2,909
After 4 years through 5 years		3,988	1,461
After 5 years		1,445	1,140
Total par value		36,890	65,088	$ 62,439
Valuation adjustments for hedging activities		639	203
Valuation adjustments under fair value option	[1]	165	83
Discounts		(1)	0
Total		$ 37,693	$ 65,374
Federal Home Loan Bank Advances, Weighted Average Interest Rate [Abstract]
Overdrawn Demand Deposit		0.01%	0.00%
Within 1 year		1.29%	1.91%
After 1 year through 2 years		1.65%	2.15%
After 2 years through 3 years		2.16%	2.08%
After 3 years through 4 years		2.48%	2.97%
After 4 years through 5 years		1.38%	2.32%
After 5 years		2.20%	2.96%
Total par value		1.63%	2.08%
Advances
Federal Home Loan Bank, Advances [Line Items]
Accrued Interest Receivable		$ 7	$ 39
[1]	At September 30, 2020, and December 31, 2019, none of these advances were 90 days or more past due or had been placed on nonaccrual status.

Advances (Earlier of Contractua

Advances (Earlier of Contractual Maturity or Next Call/Put Date) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, Rolling Year, Par Value [Abstract]
Overdrawn demand and overnight deposit accounts	$ 1	$ 0
Within 1 year	15,685	39,075
After 1 year through 2 years	9,481	15,731
After 2 years through 3 years	2,764	4,800
After 3 years through 4 years	3,546	2,895
After 4 years through 5 years	3,968	1,447
After 5 years	1,445	1,140
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, Rolling Year, Par Value [Abstract]
Within 1 year	13,335	32,371
After 1 year through 2 years	12,031	22,380
After 2 years through 3 years	2,764	4,847
After 3 years through 4 years	3,546	2,909
After 4 years through 5 years	3,988	1,461
After 5 years	1,225	1,120
Total par value	$ 36,890	$ 65,088	$ 62,439

Advances (Credit and Concentrat

Advances (Credit and Concentration Risk) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019		Dec. 31, 2019
Advances [Line Items]
Advances Outstanding		$ 36,890	$ 62,439	$ 36,890		$ 62,439		$ 65,088
Interest Income from Advances		$ 175	$ 388	$ 722	[1]	$ 1,309	[1]
Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage				100.00%		100.00%
Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage		100.00%	100.00%	100.00%		100.00%
First Republic Bank [Member]
Advances [Line Items]
Advances Outstanding		$ 13,510	$ 11,200	$ 13,510		$ 11,200
Interest Income from Advances		62	62	201	[1]	175	[1]
MUFG Union Bank, NA [Member]
Advances [Line Items]
Advances Outstanding		4,925	14,100	4,925		14,100
Interest Income from Advances		36	92	141	[1]	287	[1]
CIT Bank, National Association
Advances [Line Items]
Advances Outstanding		2,550		2,550
Interest Income from Advances		4		20	[1]
First Technology Federal Credit Union
Advances [Line Items]
Advances Outstanding		1,975		1,975
Interest Income from Advances		11		34	[1]
Luther Burbank Savings
Advances [Line Items]
Advances Outstanding		962		962
Interest Income from Advances		5		16	[2]
Wells Fargo Financial National Bank West [Member]
Advances [Line Items]
Advances Outstanding			8,000			8,000
Interest Income from Advances			49			150	[1]
Wells Fargo Bank NA [Member]
Advances [Line Items]
Advances Outstanding	[2]		41			41
Interest Income from Advances			1			2	[1],[2]
Wells Fargo and Company [Member]
Advances [Line Items]
Advances Outstanding			8,041			8,041
Interest Income from Advances			50			152
Bank of the West [Member]
Advances [Line Items]
Advances Outstanding			5,556			5,556
Interest Income from Advances			41			124	[1]
JPMorgan Chase Bank, National Association
Advances [Line Items]
Advances Outstanding			5,056			5,056
Interest Income from Advances			33			144	[1]
Top five borrowers
Advances [Line Items]
Advances Outstanding		23,922	43,953	23,922		43,953
Interest Income from Advances		$ 118	$ 278	$ 412	[1]	$ 882	[1]
Top five borrowers | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage				65.00%		70.00%
Top five borrowers | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage		67.00%	72.00%	57.00%		67.00%
Top five borrowers | First Republic Bank [Member] | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage				37.00%		18.00%
Top five borrowers | First Republic Bank [Member] | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage		35.00%	16.00%	28.00%		13.00%
Top five borrowers | MUFG Union Bank, NA [Member] | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage				13.00%		22.00%
Top five borrowers | MUFG Union Bank, NA [Member] | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage		21.00%	24.00%	19.00%		22.00%
Top five borrowers | CIT Bank, National Association | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage				7.00%
Top five borrowers | CIT Bank, National Association | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage		2.00%		3.00%
Top five borrowers | First Technology Federal Credit Union | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage				5.00%
Top five borrowers | First Technology Federal Credit Union | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage		6.00%		5.00%
Top five borrowers | Luther Burbank Savings | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage	[2]			3.00%
Top five borrowers | Luther Burbank Savings | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage		3.00%		2.00%	[2]
Top five borrowers | Wells Fargo Financial National Bank West [Member] | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage						13.00%
Top five borrowers | Wells Fargo Financial National Bank West [Member] | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage			13.00%			12.00%
Top five borrowers | Wells Fargo Bank NA [Member] | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage	[2]					0.00%
Top five borrowers | Wells Fargo Bank NA [Member] | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage			0.00%			0.00%	[2]
Top five borrowers | Wells Fargo and Company [Member] | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage						13.00%
Top five borrowers | Wells Fargo and Company [Member] | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage			13.00%			12.00%
Top five borrowers | Bank of the West [Member] | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage						9.00%
Top five borrowers | Bank of the West [Member] | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage			10.00%			9.00%
Top five borrowers | JPMorgan Chase Bank, National Association | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage						8.00%
Top five borrowers | JPMorgan Chase Bank, National Association | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage			9.00%			11.00%
Other Borrowers
Advances [Line Items]
Advances Outstanding		$ 12,968	$ 18,486	$ 12,968		$ 18,486
Interest Income from Advances		$ 57	$ 110	$ 310	[1]	$ 427	[1]
Other Borrowers | Percentage of Total Advances Outstanding
Advances [Line Items]
Concentration Risk, Percentage				35.00%		30.00%
Other Borrowers | Percentage of Total Interest Income from Advances
Advances [Line Items]
Concentration Risk, Percentage		33.00%	28.00%	43.00%		33.00%
[1]	Interest income amounts exclude the interest effect of interest rate exchange agreements with derivative counterparties; as a result, the total interest income amounts will not agree to the Statements of Income. The amount of interest income from advances can vary depending on the amount outstanding, terms to maturity, interest rates, and repricing characteristics.
[2]	Nonmember institution.

Advances (Interest Rate Payment

Advances (Interest Rate Payment Terms and Prepayment Fees) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Federal Home Loan Bank, Advances, Fixed Rate [Abstract]
Fixed Rate, due within 1 year	$ 12,343		$ 12,343		$ 15,327
Fixed Rate, due after 1 year	20,975		20,975		21,337
Advances, Total Fixed Rate	33,318		33,318		36,664
Federal Home Loan Bank, Advances, Floating Rate [Abstract]
Adjustable Rate, due within 1 year	772		772		17,024
Adjustable Rate, due after 1 year	2,800		2,800		11,400
Advances, Total Adjustable Rate	3,572		3,572		28,424
Total par value	36,890	$ 62,439	36,890	$ 62,439	$ 65,088
Prepayment Fees Received	38	0	77	0
Advances Fair Value Gain Loss Adjustments	(35)	0	(62)	1
Prepayment Fees on Advances, Net	3	0	15	1
Prepayments On Advances Principal	$ 5,018	$ 775	$ 21,804	$ 3,506

Mortgage Loans Held for Portf_3

Mortgage Loans Held for Portfolio (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	$ 2,371		$ 3,226
Unamortized premiums	42		91
Unamortized discounts	(2)		(3)
Less: Allowance for credit losses	(7)	$ (5)	0
Total mortgage loans held for portfolio, net	2,404		3,314
Total Amortized Cost	2,411		3,314
Fixed rate medium-term mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	33		27
Fixed Rate Long Term mortgage loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	$ 2,338		3,199
Fixed rate medium-term mortgage loans | Maximum
Loans and Leases Receivable Disclosure [Line Items]
Medium-term Loan Original Contractual Terms	15 years
Fixed Rate Long Term mortgage loans | Minimum
Loans and Leases Receivable Disclosure [Line Items]
Medium-term Loan Original Contractual Terms	15 years
Conventional Mortgage Loan
Loans and Leases Receivable Disclosure [Line Items]
Total Amortized Cost	$ 2,411
Mortgages
Loans and Leases Receivable Disclosure [Line Items]
Accrued Interest Receivable	$ 13		$ 19

Mortgage Loans Held for Portf_4

Mortgage Loans Held for Portfolio Delinquency Statistics (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Mortgage Loan Delinquency Statistics
Total Amortized Cost	$ 2,411	$ 3,314
COVID-19 Forbearance Plan
Mortgage Loan Delinquency Statistics
Percentage forbearance loans of total mortgage loans	6.00%
Conventional Mortgage Loan
Mortgage Loan Delinquency Statistics
Originated Five or More Years before Latest Fiscal Year	$ 2,202
Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years	209
Total Amortized Cost	2,411
In process of foreclosure, included above	1	0
Financing Receivable, Nonaccrual	$ 126	$ 7
Serious delinquencies as a percentage of total mortgage loans outstanding	5.23%	0.22%
Recorded Investment, Past Due		$ 24
Financing Receivable, Not Past Due		3,310
Total MPF Recorded Investment		3,334
Mortgage loans on nonaccrual status, with no allowance	$ 125
Conventional Mortgage Loan | COVID-19 Forbearance Plan
Mortgage Loan Delinquency Statistics
Mortgage loans, UPB	143
Conventional Mortgage Loan | 30 to 59 Days Past Due
Mortgage Loan Delinquency Statistics
Originated Five or More Years before Latest Fiscal Year	19
Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years	2
Total Amortized Cost	21
Recorded Investment, Past Due		15
Conventional Mortgage Loan | 30 to 59 Days Past Due | COVID-19 Forbearance Plan
Mortgage Loan Delinquency Statistics
Mortgage loans, UPB	6
Conventional Mortgage Loan | 60 to 89 Days Past Due
Mortgage Loan Delinquency Statistics
Originated Five or More Years before Latest Fiscal Year	16
Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years	1
Total Amortized Cost	17
Recorded Investment, Past Due		2
Conventional Mortgage Loan | 60 to 89 Days Past Due | COVID-19 Forbearance Plan
Mortgage Loan Delinquency Statistics
Mortgage loans, UPB	13
Conventional Mortgage Loan | Equal to or Greater than 90 Days Past Due
Mortgage Loan Delinquency Statistics
Originated Five or More Years before Latest Fiscal Year	116
Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years	10
Total Amortized Cost	126
Recorded Investment, Past Due		$ 7
Conventional Mortgage Loan | Equal to or Greater than 90 Days Past Due | COVID-19 Forbearance Plan
Mortgage Loan Delinquency Statistics
Mortgage loans, UPB	112
Nonperforming | Conventional Mortgage Loan
Mortgage Loan Delinquency Statistics
Originated Five or More Years before Latest Fiscal Year	151
Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years	13
Total Amortized Cost	164
Current Performing Loan | Conventional Mortgage Loan
Mortgage Loan Delinquency Statistics
Originated Five or More Years before Latest Fiscal Year	2,051
Originated, Current Fiscal Year and Preceeding Four Preceeding Fiscal Years	196
Total Amortized Cost	2,247
Current Performing Loan | Conventional Mortgage Loan | COVID-19 Forbearance Plan
Mortgage Loan Delinquency Statistics
Mortgage loans, UPB	$ 12

Mortgage Loans Held for Portf_5

Mortgage Loans Held for Portfolio Allowance (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Housing price forecast appreciation over one year horizon	1.00%	1.00%
Housing price forecast appreciation over three year horizon	4.00%	4.00%
Provision for Loan and Lease Losses	$ 2	$ 4
Allowance for credit losses on mortgage loans	7	7	$ 5	$ 0
Conventional Mortgage Loan
Loans and Leases Receivable Disclosure [Line Items]
Cumulative accounting change for CECL	$ 0	$ 3

Deposits (Details)

Deposits (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Demand Deposits [Line Items]
Interest-bearing Deposits - Adjustable rate	$ 836	$ 427
Noninterest-bearing Deposits	170	110
Deposits	1,006	537
Interest-bearing Deposits [Member] | Adjustable rate
Demand Deposits [Line Items]
Interest-bearing Deposits - Adjustable rate	$ 816	$ 427
Weighted Average Rate	0.01%	1.30%
Interest-bearing Deposits [Member] | Fixed Interest Rate [Member]
Demand Deposits [Line Items]
Interest-bearing Deposits - Adjustable rate	$ 20	$ 0
Weighted Average Rate	0.01%	0.00%

Consolidated Obligations Narrat

Consolidated Obligations Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Obligation with Joint and Several Liability Arrangement, Amount Outstanding	$ 819,863	$ 1,025,895
Federal Home Loan Bank, Consolidated Obligations	$ 68,221	$ 98,748

Consolidated Obligations (Redem

Consolidated Obligations (Redemption Terms) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total par value	$ 54,898	$ 71,370
Total	$ 54,921	$ 71,372
Weighted Average Interest Rate [Abstract]
Within 1 year	0.19%	1.68%
After 1 year through 2 years	0.93%	1.67%
After 2 years through 3 years	1.38%	1.93%
After 3 years through 4 years	1.13%	2.74%
After 4 years through 5 years	1.46%	2.08%
After 5 years	2.60%	2.94%
Consolidated obligation bonds
Debt Instrument [Line Items]
Within 1 year	$ 50,491	$ 53,549
After 1 year through 2 years	1,798	13,853
After 2 years through 3 years	506	770
After 3 years through 4 years	357	135
After 4 years through 5 years	360	937
After 5 years	1,386	2,126
Unamortized premiums	8	1
Unamortized discounts	(5)	(10)
Valuation adjustments for hedging activities	18	9
Fair value option valuation adjustments	$ 2	$ 2
Weighted Average Interest Rate [Abstract]
Total par amount	0.30%	1.73%

Consolidated Obligations (Conso

Consolidated Obligations (Consolidated Obligation Bonds Noncallable and Callable) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Derivatives, Notional Amount	$ 80,531	$ 101,072
CO Bonds Par	54,898	71,370
Non-callable
Debt Instrument [Line Items]
CO Bonds Par	52,573	65,025
Callable
Debt Instrument [Line Items]
CO Bonds Par	2,325	6,345
Consolidated obligation bonds | Consolidated Obligations, Callable Option [Member]
Debt Instrument [Line Items]
Derivatives, Notional Amount	$ 65	$ 2,085

Consolidated Obligations (Con_2

Consolidated Obligations (Consolidated Obligation Bonds by Earlier of Contractual Maturity or Next Call Date) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total bonds, par value	$ 54,898	$ 71,370
Earlier of Contractual Maturity or Next Call Date [Member]
Debt Instrument [Line Items]
Within 1 year	52,366	58,239
After 1 year through 2 years	1,953	12,768
After 2 years through 3 years	451	195
After 3 years through 4 years	77	70
After 4 years through 5 years	0	47
After 5 years	$ 51	$ 51

Consolidated Obligations (Con_3

Consolidated Obligations (Consolidated Obligation Discount Notes) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Discount notes, par value		$ 13,306	$ 27,447
Short-term Debt, Weighted Average Interest Rate, at Point in Time	[1]	0.19%	1.61%
Total		$ 13,300	$ 27,376
Discount notes
Short-term Debt [Line Items]
Unamortized discounts		$ (6)	$ (71)
[1]	Represents yield to maturity excluding concession fees.

Consolidated Obligations (Inter

Consolidated Obligations (Interest Rate Payment Terms) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Bonds	$ 54,898	$ 71,370
Discount notes, par value	13,306	27,447
Total consolidated obligations, par value	68,204	98,817
Fixed Interest Rate [Member]
Debt Instrument [Line Items]
Bonds	5,590	10,993
Adjustable Interest Rate [Member]
Debt Instrument [Line Items]
Bonds	49,263	60,117
Step-up Interest Rate [Member]
Debt Instrument [Line Items]
Bonds	45	60
Step-down Interest Rate [Member]
Debt Instrument [Line Items]
Bonds	0	100
Range Interest Rate [Member]
Debt Instrument [Line Items]
Bonds	$ 0	$ 100

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	$ 6,220	$ 6,570	$ 6,220	$ 6,570	$ 6,127	$ 6,741	$ 6,664	$ 6,530
Net change in pension and postretirement benefits	(1)	0	(1)	0
Accumulated Other-than-Temporary Impairment | Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	0	288	0	288	0	268	304	287
Non-credit-related OTTI Loss, Available-for-sale Securities		(1)		(3)
Net change in fair value	0	(15)	0	1
Reclassification from other comprehensive income/(loss) to net income/(loss) [Abstract]
Non-credit-related OTTI to credit-related OTTI, AFS				3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0	(16)	0	1
Accumulated Other-than-Temporary Impairment | Held-to-maturity Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	0	(2)	0	(2)	0	(1)	(2)	(3)
Non-credit-related OTTI Loss, Held-to-maturity Securities		0	0
Accretion of Noncredit Related OTTI Loss			1	1
Reclassification from other comprehensive income/(loss) to net income/(loss) [Abstract]
Non-credit-related OTTI to credit-related OTTI, HTM				0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0	0	1	1
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	(15)	(17)	(15)	(17)	(14)	(14)	(17)	(17)
Net change in pension and postretirement benefits	(1)		(1)
Reclassification from other comprehensive income/(loss) to net income/(loss) [Abstract]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1)	0	(1)	0
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	136	267	136	267	(35)	274	300	235
Net change in pension and postretirement benefits	(1)		(1)
Non-Credit-related OTTI loss Total		(1)		(3)
Net change in fair value	172	(32)	(138)	31
Accretion of Noncredit Related OTTI Loss			1	1
Reclassification from other comprehensive income/(loss) to net income/(loss) [Abstract]
Non-credit-related OTTI to credit-related OTTI, AFS				3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	171	(33)	(138)	32
Available-for-sale Securities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	151	(2)	151	(2)	$ (21)	21	$ 15	$ (32)
AFS Unrealized Gain/(Loss) on AFS Securities	172	(17)	(138)	30
Reclassification from other comprehensive income/(loss) to net income/(loss) [Abstract]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 172	$ (17)	$ (138)	$ 30
Cumulative Effect, Period of Adoption, Adjustment [Member] | Adjustment for cumulative effect of accounting change | Accumulated Other-than-Temporary Impairment | Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent						(268)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Adjustment for cumulative effect of accounting change | Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent						0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Adjustment for cumulative effect of accounting change | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent						$ 268

Capital (Capital Requirements)

Capital (Capital Requirements) (Details) $ in Millions	Sep. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk-Based Capital, Required	$ 1,403	$ 1,519
Risk-Based Capital, Actual	6,086	6,605
Regulatory Capital, Required	3,035	4,274
Regulatory Capital, Actual	$ 6,086	$ 6,605
Regulatory Capital Ratio, Required	4.00%	4.00%
Regulatory Capital Ratio, Actual	8.02%	6.18%
Leverage Capital, Required	$ 3,793	$ 5,342
Leverage Capital, Actual	$ 9,129	$ 9,908
Leverage ratio - Required	5.00%	5.00%
Leverage Ratio, Actual	12.03%	9.27%
Multiplier for Determining Permanent Capital in Leverage Capital Calculation	1.5

Capital (Mandatorily Redeemable

Capital (Mandatorily Redeemable Capital Stock) (Details) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020USD ($)Institutions		Sep. 30, 2019USD ($)		Sep. 30, 2020USD ($)Institutions	Sep. 30, 2019USD ($)	Dec. 31, 2019Institutions
Capital [Line Items]
Financial Instruments Subject to Mandatory Redemption, Number of Stockholders | Institutions	3				3		3
Interest Expense on Mandatorily Redeemable Capital Stock	$ 1	[1]	$ 3	[1]	$ 5	$ 11
Mandatorily Redeemable Capital Stock [Roll Forward]
Balance at the beginning of the period	83		138		138	227
Reclassified from/(to) capital during the period	0		4		3	4
Repurchase of excess mandatorily redeemable capital stock	(81)		(4)		(139)	(93)
Balance at the end of the period	$ 2		$ 138		$ 2	$ 138
[1]	The Bank excludes interest expense on mandatorily redeemable capital stock from adjusted net interest income in its analysis of financial performance for its two operating segments

Capital (By Redemption Period)

Capital (By Redemption Period) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount [Abstract]
Within 1 year		$ 0		$ 135
Past contractual redemption date because of remaining activity	[1]	2		3
Total		$ 2	$ 83	$ 138	$ 138	$ 138	$ 227
[1]	Represents mandatorily redeemable capital stock that is past the end of the contractual redemption period because of outstanding activity.

Capital (Retained Earnings and

Capital (Retained Earnings and Dividend Policy) (Details) - USD ($) $ in Millions	Nov. 12, 2020	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019	Oct. 29, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Capital [Line Items]
Restriction on Dividend Payment, Ratio of Market Value of Capital to Par Value of Capital Less than 70%		70.00%				70.00%
Ratio of Market Value of Capital to Par Value of Capital Stock		260.00%				260.00%
Retained Earnings, Set by the Board inc JCEA		$ 2,900				$ 2,900				$ 2,500
Excess Capital		$ 197				$ 197					$ 197
Excess Capital to Assets		0.26%				0.26%					0.18%
Dividends [Abstract]
Dividends, Cash, Annualized Rate		5.00%		7.00%		5.68%	7.00%
Total dividends		$ 37		$ 56		$ 131	$ 166
Interest Expense on Mandatorily Redeemable Capital Stock		1	[1]	3	[1]	5	11
Retained Earnings Activity [Roll Forward]
Total Capital		6,220		6,570		6,220	6,570		$ 6,127		$ 6,741	$ 6,664	$ 6,530
Net Income/(Loss)		161		61		241	214
Cash dividends on capital stock		(36)		(53)		(126)	(155)
Balance at end of the period		761				761
Amount of Excess Stock and Financial Instruments Subject to Mandatory Redemption, Repurchased During Period		$ 314		210		1,452	977
Subsequent Events [Abstract]
Partial Recovery of Prior Capital Distribution to Financing Corporation						40	0
Financing Corporation
Subsequent Events [Abstract]
Original Capital Distribution to Financing Corporation						680
Excess Funds From Prior Capital Distribution to Financing Corporation						$ 200
Subsequent Event
Subsequent Events [Abstract]
Dividends, Cash Declared, Annualized Rate								5.00%
Interest and Dividends Payable, Current								$ 33
Dividends Payable								33
Interest Payable, Current								$ 0
Dividends Payable, Date to be Paid	Nov. 12, 2020
Minimum
Capital [Line Items]
Regulatory Restrictions on Payment of Capital Stock Dividends, Excess Stock to Assets, Percent		1.00%				1.00%
Limit on Dividend Payment, Ratio of Market Value of Capital to Par Value of Capital		70.00%				70.00%
Retained Earnings, Set by the Board inc JCEA													2,400
Subsequent Events [Abstract]
Dividends, Cash Declared, Annualized Rate		5.00%				5.00%
Maximum
Capital [Line Items]
Limit on Dividend Payment, Ratio of Market Value of Capital to Par Value of Capital		100.00%				100.00%
Subsequent Events [Abstract]
Dividends, Cash Declared, Annualized Rate		7.00%				7.00%
Unrestricted Retained Earnings
Retained Earnings Activity [Roll Forward]
Total Capital		$ 2,858		2,715		$ 2,858	2,715		2,765		2,754	2,719	2,699
Cash dividends on capital stock		(36)		(53)		(126)	(155)
Subsequent Events [Abstract]
Partial Recovery of Prior Capital Distribution to Financing Corporation						40
Total Restricted Retained Earnings
Retained Earnings Activity [Roll Forward]
Total Capital		$ 761		$ 690		$ 761	$ 690		$ 729		$ 713	$ 678	$ 647
[1]	The Bank excludes interest expense on mandatorily redeemable capital stock from adjusted net interest income in its analysis of financial performance for its two operating segments

Capital (Excess Capital Stock)

Capital (Excess Capital Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Capital [Line Items]
Mandatorily redeemable capital stock	$ 2		$ 138		$ 2	$ 138	$ 83	$ 138	$ 138	$ 227
Amount of Excess Stock Repurchased During Period	$ 314		210		$ 1,452	977
Common stock, par value	$ 100				$ 100
Excess Capital	$ 197				$ 197			$ 197
Interest Expense on Mandatorily Redeemable Capital Stock	$ 1	[1]	$ 3	[1]	$ 5	$ 11
Mandatorily Redeemable Capital Stock, Redemption Period					5 years
Maximum
Capital [Line Items]
Dividends, Cash Declared, Annualized Rate	7.00%				7.00%
Minimum
Capital [Line Items]
Dividends, Cash Declared, Annualized Rate	5.00%				5.00%
[1]	The Bank excludes interest expense on mandatorily redeemable capital stock from adjusted net interest income in its analysis of financial performance for its two operating segments

Capital (Concentration) (Detail

Capital (Concentration) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Capital Stock Outstanding	$ 2,467	$ 3,138
Total Capital Stock, 10% or more
Concentration Risk [Line Items]
Percentage of Total Capital Stock Outstanding	100.00%	100.00%
Certain Members And Certain Nonmembers [Member]
Concentration Risk [Line Items]
Capital Stock Outstanding	$ 572	$ 762
Percentage of Total Capital Stock Outstanding	23.00%	24.00%
Other Borrowers
Concentration Risk [Line Items]
Capital Stock Outstanding	$ 1,895	$ 2,376
Percentage of Total Capital Stock Outstanding	77.00%	76.00%
First Republic Bank [Member]
Concentration Risk [Line Items]
Capital Stock Outstanding	$ 419	$ 368
First Republic Bank [Member] | Total Capital Stock, 10% or more
Concentration Risk [Line Items]
Percentage of Total Capital Stock Outstanding	17.00%	12.00%
MUFG Union Bank, NA [Member]
Concentration Risk [Line Items]
Capital Stock Outstanding	$ 153	$ 394
MUFG Union Bank, NA [Member] | Total Capital Stock, 10% or more
Concentration Risk [Line Items]
Percentage of Total Capital Stock Outstanding	6.00%	12.00%

Segment Information (Details)

Segment Information (Details) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2020USD ($)		Sep. 30, 2019USD ($)		Sep. 30, 2020USD ($)segment	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segment						2
Adjusted Net Interest Income		$ 103		$ 132		$ 322	$ 423
Amortization of Basis Adjustments and Gain/Loss on Fair Value Hedges		(13)		20		61	54
Income/(Expense) on Economic Hedges		(34)	[1]	(3)	[1]	(52)	(8)
Interest Expense on Mandatorily Redeemable Capital Stock		1	[2]	3	[2]	5	11
Net Interest Income After Provision for/(Reversal of) Credit Losses		149		112		308	366
Other Income/ (Loss)		70		3		79	11
Other Expense		40		47		119	138
Income/(Loss) Before AHP Assessment		179		68		268	239
OTTI PLRMBS, Total accretion or amortization recognized in interest income		17		21		54	58
Provision for Loan, Lease, and Other Losses		(2)		0		30	0
Net OTTI loss, credit-related				2			8
Assets		75,870				75,870		$ 106,842
Advances- Related Business
Segment Reporting Information [Line Items]
Adjusted Net Interest Income		50		72		182	237
Assets		56,829				56,829		85,709
Mortgage- Related Business
Segment Reporting Information [Line Items]
Adjusted Net Interest Income	[3]	53		$ 60		140	$ 186
Assets		$ 19,041				$ 19,041		$ 21,133
[1]	The Bank includes income and expense associated with net settlements from economic hedges in adjusted net interest income in its analysis of financial performance for its two operating segments. For financial reporting purposes, the Bank does not include these amounts in net interest income in the Statements of Income, but instead records them in other income in “Net gain/(loss) on derivatives and hedging activities.”
[2]	The Bank excludes interest expense on mandatorily redeemable capital stock from adjusted net interest income in its analysis of financial performance for its two operating segments
[3]	The mortgage-related business includes total accretion or amortization associated with other-than-temporarily impaired PLRMBS, which are recognized in interest income, totaled $17 and $21 for the three months ended September 30, 2020 and 2019; and totaled $54 and $58 for the nine months ended September 30, 2020 and 2019, respectively. The mortgage-related business includes a provision for/(reversal of) credit losses of $(2) and $30 for the three and nine months ended September 30, 2020, respectively. The mortgage-related business does not include credit-related OTTI losses of $2 and $8 for the three and nine months ended September 30, 2019, respectively.

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)
Derivative [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	$ 290
Collateral Already Posted, Aggregate Fair Value	$ 329
Maximum
Derivative [Line Items]
Advances, Maturity Period, Fixed Rate	30 years

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities (Derivatives in Statement of Condition) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount		$ 80,531	$ 101,072
Derivative Assets		58	44
Netting adjustments and cash collateral	[1]	(2)	(11)
Total Derivative Assets and Derivative Liabilities		56	33
Derivative Liabilities		330	384
Netting Adjustments and Cash Collateral-Derivative Liability	[1]	(329)	(384)
Derivative Assets and Derivative Liabilities		1	0
Cash collateral posted, including accrued interest		335	378
Cash collateral received, including accrued interest		8	5
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount		38,608	39,622
Derivative Assets		48	31
Derivative Liabilities		303	370
Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount		38,608	39,622
Derivative Assets		48	31
Derivative Liabilities		303	370
Not Designated as Hedging Instrument, Economic Hedge | Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount		40,937	60,424
Derivative Assets		10	13
Derivative Liabilities		27	14
Not Designated as Hedging Instrument, Economic Hedge | Interest rate caps and floors
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount		980	980
Derivative Assets		0	0
Derivative Liabilities		0	0
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount		41,923	61,450
Derivative Assets		10	13
Derivative Liabilities		27	14
Mortgages | Not Designated as Hedging Instrument | Mortgage delivery commitments
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount		6	46
Derivative Assets		0	0
Derivative Liabilities		$ 0	$ 0
[1]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral, including accrued interest, held or placed with the same clearing agents and/or counterparty. Cash collateral posted, including accrued interest, was $335 and $378 at September 30, 2020, and December 31, 2019, respectively. Cash collateral received, including accrued interest, was $8 and $5 at September 30, 2020, and December 31, 2019, respectively.

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities (Derivatives in Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Advances	$ 88	$ 389	$ 509		$ 1,343
AFS securities	67	100	179		261
Bonds	(47)	(409)	(405)		(1,306)
Advances | Interest Income [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	22	(36)	(715)	[1]	(292)	[1]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(112)	37	486		325
Gain (loss) on Fair Value Hedges Recognized in Net Interest Income	(90)	1	(229)		33
Available-for-sale Securities | Interest Income [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	54	(224)	(995)	[1]	(594)	[1]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(112)	209	803		552
Gain (loss) on Fair Value Hedges Recognized in Net Interest Income	(58)	(15)	(192)		(42)
Consolidated Obligations, Bonds | Interest Expense [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	(1)	2	27	[1]	43	[1]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	8	(4)	(9)		(61)
Gain (loss) on Fair Value Hedges Recognized in Net Interest Income	$ 7	$ (2)	$ 18		$ (18)
[1]	.

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities Cumulative adjustments table (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Advances
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized Cost of Hedged Asset, Fair Value Hedge	$ 25,815	$ 22,900
Basis Adjustment for Active Fair Value Hedged Asset Cumulative Increase Decrease	619	204
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	639	204
Available-for-sale Securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized Cost of Hedged Asset, Fair Value Hedge	12,541	12,877
Basis Adjustment for Active Fair Value Hedged Asset Cumulative Increase Decrease	318	431
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	1,234	431
Consolidated Obligations, Bonds
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized Cost of Hedged Liability, Fair Value Hedge	(2,541)	(4,840)
Basis Adjustment for Active Fair Value Hedged Liability Cumulative Increase Decrease	(19)	(9)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	(19)	(9)
Advances
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Basis Adjustment for Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	20	0
Available-for-sale Securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Basis Adjustment for Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	916	0
Consolidated Obligations, Bonds
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Basis Adjustment for Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	$ 0	$ 0

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities (Derivatives in Statement of Income and Impact on Interest) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 5	$ (20)	$ (156)	$ (109)
Gain (Loss) on Derivative and Hedging Activities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative Instruments	5	(20)	(156)	(109)
Gain (Loss) on Derivative and Hedging Activities | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	39	(17)	(107)	(102)
Gain (Loss) on Derivative and Hedging Activities | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Caps and Floors [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(1)	0	(2)
Gain (Loss) on Derivative and Hedging Activities | Not Designated as Hedging Instrument, Economic Hedge [Member] | Net Settlements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(34)	(3)	(52)	(8)
Gain (Loss) on Derivative and Hedging Activities | Not Designated as Hedging Instrument [Member] | Mortgage delivery commitments | Mortgages
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 0	$ 1	$ 3	$ 3

Derivatives and Hedging Activ_8

Derivatives and Hedging Activities (Offsetting of Derivative Assets and Derivative Liabilities) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Total Derivative Assets and Derivative Liabilities		$ 56	$ 33
Derivative Asset, Fair Value, Amount Offset Against Collateral		442	414
Netting Adjustments and Cash Collateral-Derivative Liability	[1]	(329)	(384)
Derivative Assets and Derivative Liabilities		1	0
Derivative Liability, Fair Value, Amount Offset Against Collateral		1	0
Uncleared derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Recognized Amount		33	34
Derivative Asset Fair Value Gross Liability and Right To Reclaim Cash Offset		7	(16)
Total Derivative Assets and Derivative Liabilities		40	18
Derivative Asset, Noncash collateral not offset that can be sold or repledged		0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral		40	18
Derivative Liability, Fair Value, Gross Recognized Amount		315	382
Netting Adjustments and Cash Collateral-Derivative Liability		(314)	(382)
Derivative Assets and Derivative Liabilities		1	0
Derivative Liability, Noncash collateral not offset that can be sold or repledged		0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral		1	0
Cleared derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Recognized Amount		25	10
Derivative Asset Fair Value Gross Liability and Right To Reclaim Cash Offset		(9)	5
Total Derivative Assets and Derivative Liabilities		16	15
Derivative Asset, Noncash collateral not offset that can be sold or repledged		(386)	(381)
Derivative Asset, Fair Value, Amount Offset Against Collateral		402	396
Derivative Liability, Fair Value, Gross Recognized Amount		15	2
Netting Adjustments and Cash Collateral-Derivative Liability		(15)	(2)
Derivative Assets and Derivative Liabilities		0	0
Derivative Liability, Noncash collateral not offset that can be sold or repledged		0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral		$ 0	$ 0
[1]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral, including accrued interest, held or placed with the same clearing agents and/or counterparty. Cash collateral posted, including accrued interest, was $335 and $378 at September 30, 2020, and December 31, 2019, respectively. Cash collateral received, including accrued interest, was $8 and $5 at September 30, 2020, and December 31, 2019, respectively.

Fair Value (Carrying Value and

Fair Value (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Assets
Cash and due from banks		$ 175		$ 118
Trading securities		4,281		1,766
Available-for-sale (AFS) securities	[1]	14,671		15,495
HTM securities, Carrying Value	[2]	5,718		7,545
HTM Securities, Fair Value		5,755		7,566
Accrued interest receivable		100		139
Derivative assets, net		56		33
Derivative Assets		58		44
Derivative Asset, Netting adjustments	[3]	2		11
Liabilities
Mandatorily redeemable capital stock		2	$ 83	138		$ 138	$ 138	$ 227
Accrued interest payable		31		164
Derivative liabilities, net		1		0
Derivative Liabilities		330		384
Derivative Liability, Netting adjustments	[3]	(329)		(384)
Net Carrying Value
Assets
Cash and due from banks		175		118
Interest-bearing deposits		1,478		2,269
Securities purchased under agreements to resell		6,750		7,000
Federal funds sold		2,323		3,562
Trading securities		4,281		1,766
Available-for-sale (AFS) securities		14,671		15,495
HTM securities, Carrying Value		5,718		7,545
Advances		37,693		65,374
Mortgage loans held for portfolio, net of allowance for credit losses on mortgage loans		2,404		3,314
Accrued interest receivable		100		139
Derivative assets, net	[4]	56		33
Other assets	[5]	20		19
Liabilities
Deposits		1,006		537
Total consolidated obligations		68,221		98,748
Mandatorily redeemable capital stock		2		138
Accrued interest payable		31		164
Derivative liabilities, net	[4]	1		0
Estimated Fair Value
Assets
Cash and due from banks		175		118
Interest-bearing deposits		1,478		2,269
Securities purchased under agreements to resell		6,750		7,000
Federal funds sold		2,323		3,562
Trading securities		4,281		1,766
Available-for-sale (AFS) securities		14,671		15,495
HTM Securities, Fair Value		5,755		7,566
Advances		37,887		65,492
Mortgage loans held for portfolio, net of allowance for credit losses on mortgage loans		2,418		3,332
Accrued interest receivable		100		139
Derivative assets, net	[4]	56		33
Other assets	[5]	20		19
Liabilities
Deposits		1,006		537
Total consolidated obligations		68,286		98,764
Mandatorily redeemable capital stock		2		138
Accrued interest payable		31		164
Derivative liabilities, net	[4]	1		0
Level 1
Assets
Cash and due from banks		175		118
Interest-bearing deposits		1,478		2,269
Securities purchased under agreements to resell		0		0
Federal funds sold		0		0
Trading securities		0		0
Available-for-sale (AFS) securities		0		0
HTM Securities, Fair Value		0		0
Advances		0		0
Mortgage loans held for portfolio, net of allowance for credit losses on mortgage loans		0		0
Accrued interest receivable		0		0
Derivative Assets		0		0	[4]
Other assets	[5]	20		19
Liabilities
Deposits		0		0
Total consolidated obligations		0		0
Mandatorily redeemable capital stock		2		138
Accrued interest payable		0		0
Derivative Liabilities		0		0	[4]
Level 2
Assets
Cash and due from banks		0		0
Interest-bearing deposits		0		0
Securities purchased under agreements to resell		6,750		7,000
Federal funds sold		2,323		3,562
Trading securities		4,281		1,766
Available-for-sale (AFS) securities		12,535		12,898
HTM Securities, Fair Value		5,444		7,181
Advances		37,887		65,492
Mortgage loans held for portfolio, net of allowance for credit losses on mortgage loans		2,418		3,332
Accrued interest receivable		100		139
Derivative Assets	[4]	58		44
Derivative Asset, Netting adjustments	[4]	(2)		(11)
Other assets	[5]	0		0
Liabilities
Deposits		1,006		537
Total consolidated obligations		68,286		98,764
Mandatorily redeemable capital stock		0		0
Accrued interest payable		31		164
Derivative Liabilities	[4]	330		384
Derivative Liability, Netting adjustments	[4]	(329)		(384)
Level 3
Assets
Cash and due from banks		0		0
Interest-bearing deposits		0		0
Securities purchased under agreements to resell		0		0
Federal funds sold		0		0
Trading securities		0		0
Available-for-sale (AFS) securities		2,136		2,597
HTM Securities, Fair Value		311		385
Advances		0		0
Mortgage loans held for portfolio, net of allowance for credit losses on mortgage loans		0		0
Accrued interest receivable		0		0
Derivative Assets		0		0	[4]
Other assets	[5]	0		0
Liabilities
Deposits		0		0
Total consolidated obligations		0		0
Mandatorily redeemable capital stock		0		0
Accrued interest payable		0		0
Derivative Liabilities		0		0	[4]
Standby letters of credit | Net Carrying Value
Other
Other commitments		33		32
Standby letters of credit | Estimated Fair Value
Other
Other commitments		33		32
Standby letters of credit | Level 1
Other
Other commitments		0		0
Standby letters of credit | Level 2
Other
Other commitments		33		32
Standby letters of credit | Level 3
Other
Other commitments		0		0
Discount notes | Net Carrying Value
Liabilities
Discount notes		13,300		27,376
Discount notes | Estimated Fair Value
Liabilities
Discount notes		13,302		27,378
Discount notes | Level 1
Liabilities
Discount notes		0		0
Discount notes | Level 2
Liabilities
Discount notes		13,302		27,378
Discount notes | Level 3
Liabilities
Discount notes		0		0
Bonds
Liabilities
Bonds		112		337
Bonds | Net Carrying Value
Liabilities
Bonds		54,921		71,372
Bonds | Estimated Fair Value
Liabilities
Bonds		54,984		71,386
Bonds | Level 1
Liabilities
Bonds		0		0
Bonds | Level 2
Liabilities
Bonds		54,984		71,386
Bonds | Level 3
Liabilities
Bonds		$ 0		$ 0
[1]	At September 30, 2020, $386 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 September 30, 2020, and December 31, 2019, none of these securities were pledged as collateral that may be repledged.
[3]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral, including accrued interest, held or placed with the same clearing agents and/or counterparty. Cash collateral posted, including accrued interest, was $335 and $378 at September 30, 2020, and December 31, 2019, respectively. Cash collateral received, including accrued interest, was $8 and $5 at September 30, 2020, and December 31, 2019, respectively.
[4]	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.
[5]	Represents publicly traded mutual funds held in a grantor trust.

Fair Value (Fair Value Measured

Fair Value (Fair Value Measured on Recurring and Nonrecurring Basis) (Details) - USD ($) $ in Millions		Sep. 30, 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		$ 3	$ 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		4,278	1,762
Available-for-sale (AFS) securities		3,801	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		4,278	1,762
Available-for-sale (AFS) securities		3,801	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		3	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		3	4
Trading securities		4,281	1,766
Available-for-sale (AFS) securities	[1]	14,671	15,495
Fair Value of Advances Under the Fair Value Option	[2]	3,103	4,370
Derivative Asset, Netting adjustments	[3]	2	11
Derivative assets, net		56	33
Derivative Liability, Netting adjustments	[3]	(329)	(384)
Derivative liabilities, net		1	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]	20	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		4,281	1,766
Available-for-sale (AFS) securities		12,535	12,898
Derivative Asset, Netting adjustments	[5]	(2)	(11)
Other assets	[4]	0	0
Derivative Liability, Netting adjustments	[5]	(329)	(384)
Mortgage loans held for portfolio		2,418	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		2,136	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]
Fair Value of Advances Under the Fair Value Option	[6]	3,103	4,370
Derivative Asset, Netting adjustments	[7]	(2)	(11)
Derivative Liability, Netting adjustments	[7]	(329)	(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
Fair Value of Advances Under the Fair Value Option	[6]	0	0
Other assets		20	19
Total fair value measurements – Assets		20	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		4,281	1,766
Available-for-sale (AFS) securities		12,535	12,898
Fair Value of Advances Under the Fair Value Option	[6]	3,103	4,370
Other assets		0	0
Total fair value measurements – Assets		19,977	19,078
Total recurring fair value measurements – Liabilities		442	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		2,136	2,597
Fair Value of Advances Under the Fair Value Option	[6]	0	0
Other assets		0	0
Total fair value measurements – Assets		2,136	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]	24	1
Mortgage loans held for portfolio	[8]	24	1
Consolidated obligation bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds		112	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		54,984	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]	112	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]	112	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		4,281	1,766
Available-for-sale (AFS) securities		14,671	15,495
Derivative assets, net	[5]	56	33
Other assets	[4]	20	19
Derivative liabilities, net	[5]	1	0
Mortgage loans held for portfolio		2,418	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		4,281	1,766
Available-for-sale (AFS) securities		14,671	15,495
Other assets		20	19
Total fair value measurements – Assets		22,131	21,683
Total recurring fair value measurements – Liabilities		113	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]	24	1
Mortgage loans held for portfolio	[8]	24	1
Estimate of Fair Value Measurement | Consolidated obligation bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds		54,984	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]	(2)	(11)
Derivative Liability, Netting adjustments	[7]	(329)	(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		58	44
Derivative liabilities, net		330	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		56	33
Derivative liabilities, net		1	0
Multifamily [Member] | 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		8,734	7,610
Residential Mortgage Backed Securities | Subtotal PLRMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale (AFS) securities		2,136	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		2,136	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		2,136	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		8,734	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		2,136	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		10,870	10,207
Residential Mortgage Backed Securities | Multifamily [Member] | 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 | Multifamily [Member] | 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		8,734	7,610
Residential Mortgage Backed Securities | Multifamily [Member] | 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 | Multifamily [Member] | 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		$ 8,734	$ 7,610
[1]	At September 30, 2020, $386 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 September 30, 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, including accrued interest, held or placed with the same clearing agents and/or counterparty. Cash collateral posted, including accrued interest, was $335 and $378 at September 30, 2020, and December 31, 2019, respectively. Cash collateral received, including accrued interest, was $8 and $5 at September 30, 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 September 30, 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 nine months ended September 30, 2020
[9]	Represents consolidated obligation bonds recorded under the fair value option at September 30, 2020, and December 31, 2019

Fair Value (Level 3) (Details)

Fair Value (Level 3) (Details) - Subtotal PLRMBS - Fair Value, Measurements, Recurring - Level 3 - Available-for-sale Securities - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of the period	$ 2,225	$ 2,929	$ 2,597	$ 3,157
Interest income	17	20	53	57
Provision for Other Credit Losses	4	0	(26)	0
Other Income, net	0	(3)	0	(8)
Unrealized gain/(loss) included in AOCI	29	(15)	(111)	1
Settlements	(139)	(176)	(378)	(452)
Transfers of HTM to AFS			1	0
Balance, end of the period	2,136	2,755	2,136	2,755
Total amount of gain/(loss) for the period included in earnings attributable to the change in unrealized gains/losses relating to assets and liabilities still held at the end of the period	$ 20	$ 16	$ 27	$ 46

Fair Value (Fair Value Option)

Fair Value (Fair Value Option) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]
Balance, beginning of the period	[1]			$ 4,370
Net gain/(loss) on advances and net (gain)/loss on consolidated obligation bonds from changes in fair value recognized in earnings		$ (7)	$ 20	96	$ 111
Balance, end of the period	[1]	3,103		3,103
Advances
Fair Value, Option, Quantitative Disclosures [Line Items]
Balance, beginning of the period		3,478	4,529	4,370	5,133
New transactions elected for fair value option				7,070	74
Maturities and terminations		(367)	(583)	(8,432)	(1,363)
Net gain/(loss) on advances and net (gain)/loss on consolidated obligation bonds from changes in fair value recognized in earnings		(8)	22	97	125
Change in accrued interest		0	(1)	(2)	(2)
Balance, end of the period		3,103	3,967	3,103	3,967
Consolidated obligation bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Net gain/(loss) on advances and net (gain)/loss on consolidated obligation bonds from changes in fair value recognized in earnings		(1)	2	1	14
Balance, beginning of the period		128	943	337	2,019
New transactions elected for fair value option				0	0
Maturities and terminations		(15)	(365)	(225)	(1,448)
Change in accrued interest		0	(3)	(1)	(8)
Balance, end of the period		$ 112	$ 577	$ 112	$ 577
[1]	At September 30, 2020, and December 31, 2019, none of these advances were 90 days or more past due or had been placed on nonaccrual status.

Fair Value (Fair Value Differen

Fair Value (Fair Value Difference Between Fair Value and Remaining Contractual Principal Balance Outstanding) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Option, Principal Balance, Advances	[1]	$ 2,938		$ 4,287
Fair Value of Advances Under the Fair Value Option	[1]	3,103		4,370
Fair Value Over/(Under) Principal Balance, Advances	[1]	165		83
Consolidated obligation bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value Option, Principal Balance, CO Bonds		110		335
Fair Value of Bonds Under the Fair Value Option		112		337
Fair Value Over/(Under) Principal Balance, CO Bonds		2		2
Advances
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Advances Under the Fair Value Option		3,103	$ 3,478	4,370	$ 3,967	$ 4,529	$ 5,133
Consolidated obligation bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Bonds Under the Fair Value Option		$ 112	$ 128	$ 337	$ 577	$ 943	$ 2,019
[1]	At September 30, 2020, and December 31, 2019, none of these advances were 90 days or more past due or had been placed on nonaccrual status.

Commitments and Contingencies O

Commitments and Contingencies Off-Balance Sheet Commitments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
Obligation with Joint and Several Liability Arrangement, Amount Outstanding	$ 819,863		$ 819,863		$ 1,025,895
Standby Letters Of Credit, Final Expiration			2035
Other Liabilities	260		$ 260		362
Commitments to purchase mortgage loans, maximum term			60 days
Total consolidated obligations, par value	68,204		$ 68,204		98,817
Assets Pledged As Collateral	721		721		759
Security Owned and Pledged as Collateral, Fair Value	386		386		381
Derivative, Collateral, Right to Reclaim Cash	335		335		378
MPF Service Fee Expense to FHLB Chicago	1	$ 1	2	$ 2
Standby letters of credit outstanding
Loss Contingencies [Line Items]
Expire Within One Year	12,980		12,980		16,898
Expire After One Year	4,723		4,723		4,658
Total	17,703		17,703		21,556
Other Liabilities	33		33		32
Commitments to issue consolidated obligation discount notes, par
Loss Contingencies [Line Items]
Expire Within One Year	0		0		805
Expire After One Year	0		0		0
Total	0		0		805
Commitments to issue consolidated obligation bonds, par
Loss Contingencies [Line Items]
Expire Within One Year	170		170		0
Expire After One Year	0		0		0
Total	170		$ 170		0
Minimum | Standby letters of credit outstanding
Loss Contingencies [Line Items]
Guarantor Obligations, Term			8 days
Maximum | Standby letters of credit outstanding
Loss Contingencies [Line Items]
Guarantor Obligations, Term			15 years
Guarantee of Indebtedness of Others
Loss Contingencies [Line Items]
Total consolidated obligations, par value	68,204		$ 68,204		98,817
Mortgages | Commitments to purchase mortgage loans
Loss Contingencies [Line Items]
Expire Within One Year	6		6		46
Expire After One Year	0		0		0
Total	$ 6		$ 6		$ 46

Transactions with Certain Mem_2

Transactions with Certain Members, Certain Nonmembers, and Other FHLBanks (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Payments to Extend Overnight Loans to Other FHLBanks			$ (925)	$ (1,450)
Proceeds from Other FHLBank Borrowings			885	1,545
Assets:
Advances	$ 37,693		37,693		$ 65,374
Mortgage loans held for portfolio	2,404		2,404		3,314
Accrued interest receivable	100		100		139
Liabilities:
Deposits	1,006		1,006		537
Capital [Abstract]
Capital Stock	2,465		2,465		3,000
Interest Income:
Advances	88	$ 389	509	1,343
Mortgage loans held for portfolio	7	18	22	55
MPF Service Fee Expense to FHLB Chicago	1	1	2	2
FHLBanks [Member]
Related Party Transaction [Line Items]
Deposits with other FHLB	1		1		1
MPF Counterparty fee Income	0	0	0	0
Transaction with Member Officer or Director
Assets:
Advances	3,514		3,514		3,697
Mortgage loans held for portfolio	0		0		8
Accrued interest receivable	5		5		6
Liabilities:
Deposits	26		26		22
Capital [Abstract]
Capital Stock	129		129		$ 132
Interest Income:
Advances	$ 19	$ 22	$ 59	$ 66