Federal Home Loan Bank of Des Moines 10-Q 9 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 31, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	Federal Home Loan Bank of Des Moines
Entity Central Index Key	1,325,814
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		62,691,068

Statements of Condition

Statements of Condition - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks		$ 964	$ 223
Interest-bearing deposits		2	2
Securities purchased under agreements to resell		3,500	5,925
Federal funds sold		5,100	5,095
Investment securities
Trading securities (Note 3)		2,549	2,553
Available-for-sale securities (Note 4)		22,403	22,969
Held-to-maturity securities (fair value of $4,265 and $4,706) (Note 5)		4,209	4,674
Total investment securities		29,161	30,196
Advances (Note 7)		118,878	131,601
Mortgage loans held for portfolio, net of allowance for credit losses of $2 and $2 (Notes 8 and 9)		6,953	6,913
Loans to Other Federal Home Loan Banks		0	200
Accrued interest receivable		206	197
Derivative assets, net (Note 10)		139	191
Other assets		85	62
TOTAL ASSETS		164,988	180,605
LIABILITIES
Interest-bearing		868	1,021
Non-interest-bearing		96	92
Total deposits		964	1,113
Consolidated obligations (Note 11)
Discount notes		66,558	80,947
Bonds		89,171	89,898
Total consolidated obligations		155,729	170,845
Mandatorily redeemable capital stock (Note 12)	[1]	480	664
Accrued interest payable		209	180
Affordable Housing Program payable		133	116
Derivative liabilities, net (Note 10)		23	76
Other liabilities		54	210
TOTAL LIABILITIES		157,592	173,204
Commitments and contingencies (Note 14)
CAPITAL (Note 12)
Capital stock - Class B putable ($100 par value); 56 and 59 issued and outstanding shares		5,623	5,917
Additional capital from merger		0	52
Retained earnings
Unrestricted		1,399	1,219
Restricted		285	231
Total retained earnings		1,684	1,450
Accumulated other comprehensive income (loss)		89	(18)
TOTAL CAPITAL		7,396	7,401
TOTAL LIABILITIES AND CAPITAL		$ 164,988	$ 180,605
[1]	At the Bank's election, the mandatorily redeemable capital stock may be redeemed prior to the expiration of the five year redemption period that commences on the date of the notice of redemption, or in the case of captive insurance company members, on the date of the membership termination.

Statements of Condition (Parent

Statements of Condition (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Held-to-Maturity Securities, Fair Value	$ 4,265	$ 4,706
Advances, Fair Value Option	0	0
Loans and Leases Receivable, Allowance	$ 2	$ 2
Capital Stock - Class B Putable, Par Value	$ 100	$ 100
Consolidated Obligation Bonds [Member]
Bonds, Fair Value Option	$ 0	$ 0
Common Class B [Member]
Capital Stock - Class B Putable, Par Value	$ 100	$ 100
Capital Stock - Class B Putable, Issued Shares	56	59
Capital Stock - Class B Putable, Outstanding Shares	56	59

Statements of Income

Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
NET INTEREST INCOME AFTER PROVISION (REVERSAL) FOR CREDIT LOSSES	$ 170	$ 93	$ 323	$ 196
INTEREST INCOME
Advances	380	188	713	357
Prepayment fees on advances, net	1	1	1	5
Interest-bearing deposits	1	0	1	1
Securities purchased under agreements to resell	8	5	16	9
Federal funds sold	15	4	27	8
Trading securities	12	14	23	26
Available-for-sale securities	89	57	168	113
Held-to-maturity securities	20	19	40	40
Mortgage loans held for portfolio	59	59	117	120
Total interest income	585	347	1,106	679
INTEREST EXPENSE
Consolidated obligations - Discount notes	124	113	233	222
Consolidated obligations - Bonds	286	135	539	251
Deposits	1	0	2	0
Mandatorily redeemable capital stock	4	5	9	9
Total interest expense	415	253	783	482
NET INTEREST INCOME	170	94	323	197
Provision (reversal) for credit losses on mortgage loans	0	1	0	1
OTHER INCOME (LOSS)
Net gains (losses) on trading securities	4	18	9	53
Net gains (losses) on derivatives and hedging activities	(3)	(30)	3	(73)
Gains on litigation settlements, net	0	200	21	337
Other, net	5	4	8	7
Total other income (loss)	6	192	41	324
OTHER EXPENSE
Compensation and benefits	14	12	27	26
Contractual services	3	3	6	6
Professional fees	5	3	10	4
Other operating expenses	5	5	10	9
Federal Housing Finance Agency	2	2	5	4
Office of Finance	2	1	4	3
Other, net	0	1	1	2
Total other expense	31	27	63	54
NET INCOME BEFORE ASSESSMENTS	145	258	301	466
Affordable Housing Program assessments	15	26	31	47
NET INCOME	$ 130	$ 232	$ 270	$ 419

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 130	$ 232	$ 270	$ 419
Other comprehensive income (loss)
Unrealized gains (losses)	41	36	105	(1)
Pension and postretirement benefits	1	1	2	0
Total other comprehensive income (loss)	42	37	107	(1)
TOTAL COMPREHENSIVE INCOME (LOSS)	$ 172	$ 269	$ 377	$ 418

Statements of Capital

Statements of Capital - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			$ 7,401	$ 5,625
Proceeds from issuance of capital stock			2,905	3,232
Repurchases/redemptions of capital stock			(3,171)	(1,974)
Net shares reclassified (to) from mandatorily redeemable capital stock	$ (18)	$ (1)	(28)	(731)
Total Comprehensive Income	172	269	377	418
Cash dividends on capital stock			(88)	(66)
BALANCE	7,396	6,504	7,396	6,504
Additional Capital from Merger [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			52	194
Cash dividends on capital stock			(52)	(66)
BALANCE	0	128	0	128
Retained Earnings, Unrestricted [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			1,219	700
Total Comprehensive Income			216	335
Cash dividends on capital stock			(36)	0
BALANCE	1,399	1,035	1,399	1,035
Retained Earnings, Restricted [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			231	101
Total Comprehensive Income			54	84
BALANCE	285	185	285	185
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			1,450	801
Total Comprehensive Income			270	419
Cash dividends on capital stock			(36)	0
BALANCE	1,684	1,220	1,684	1,220
Accumulated Other Comprehensive Income [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			(18)	(84)
Total Comprehensive Income			107	(1)
BALANCE	89	(85)	89	(85)
Common Class B [Member] | Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE			$ 5,917	$ 4,714
BALANCE (shares)			59	47
Proceeds from issuance of capital stock			$ 2,905	$ 3,232
Proceeds from issuance of capital stock (shares)			29	32
Repurchases/redemptions of capital stock			$ (3,171)	$ (1,974)
Repurchases/redemptions of capital stock (shares)			(32)	(20)
Net shares reclassified (to) from mandatorily redeemable capital stock			$ (28)	$ (731)
Net shares reclassified (to) from mandatorily redeemable capital stock (shares)			0	(7)
BALANCE	$ 5,623	$ 5,241	$ 5,623	$ 5,241
BALANCE (shares)	56	52	56	52

Statements of Cash Flows

Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net income	$ 270	$ 419
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	16	52
Net (gains) losses on trading securities	(9)	(53)
Net change in derivatives and hedging activities	(1)	45
Other adjustments	(1)	(8)
Net change in:
Accrued interest receivable	(36)	(37)
Other assets	(4)	(2)
Accrued interest payable	29	14
Other liabilities	(15)	38
Total adjustments	(21)	49
Net cash provided by (used in) operating activities	249	468
Net change in:
Interest-bearing deposits	17	(460)
Securities purchased under agreements to resell	2,425	(25)
Federal funds sold	(5)	(2,080)
Premises, software, and equipment	(21)	(5)
Proceeds from Federal Home Loan Bank Loans	200	0
Trading securities
Proceeds from maturities of long-term	13	12
Purchases of long-term	0	(1,598)
Available-for-sale securities
Proceeds from sales and maturities of long-term	1,002	1,306
Purchases of long-term	(402)	(1,791)
Held-to-maturity securities
Proceeds from sales and maturities of long-term	457	752
Advances
Principal collected	142,862	90,807
Originated	(130,163)	(117,776)
Mortgage loans held for portfolio
Principal collected	516	555
Originated or purchased	(566)	(452)
Proceeds from sales of foreclosed assets	4	9
Net cash provided by (used in) investing activities	16,339	(30,746)
FINANCING ACTIVITIES
Net change in deposits	(150)	(44)
Net payments on derivative contracts with financing elements	(2)	(3)
Net proceeds from issuance of consolidated obligations
Discount notes	118,084	143,494
Bonds	26,848	49,439
Payments for maturing and retiring consolidated obligations
Discount notes	(132,486)	(150,017)
Bonds	(27,575)	(14,169)
Proceeds from issuance of capital stock	2,905	3,232
Payments for repurchases/redemptions of capital stock	(3,171)	(1,974)
Net payments for repurchases/redemptions of mandatorily redeemable capital stock	(212)	(136)
Cash dividends paid	(88)	(66)
Net cash provided by (used in) financing activities	(15,847)	29,756
Net increase (decrease) in cash and due from banks	741	(522)
Cash and due from banks at beginning of the period	223	982
Cash and due from banks at end of the period	964	460
SUPPLEMENTAL DISCLOSURES
Interest paid	1,091	783
Affordable Housing Program payments	15	8
Capitalized interest on reverse mortgage securities	27	11
Mortgage loan charge-offs	1	1
Transfers of mortgage loans to real estate owned	3	5
Capital stock reclassified to (from) mandatorily redeemable capital stock, net	$ 28	$ 731

Background Information

Background Information	6 Months Ended
	Jun. 30, 2017
Background Information [Abstract]
Nature of Operations [Text Block]	Background Information The Federal Home Loan Bank of Des Moines (the Bank) is a federally chartered corporation organized on October 31, 1932, that is exempt from all federal, state, and local taxation (except real property taxes) and is one of 11 district Federal Home Loan Banks (FHLBanks). The FHLBanks were created under the authority of the Federal Home Loan Bank Act of 1932 (FHLBank Act). With the passage of the Housing and Economic Recovery Act of 2008 (Housing Act), the Federal Housing Finance Agency (Finance Agency) was established and became the new independent federal regulator of Federal National Mortgage Association (Fannie Mae) and Federal Home Loan Mortgage Corporation (Freddie Mac) (collectively, Enterprises), as well as the FHLBanks and FHLBanks' Office of Finance, effective July 30, 2008. The Finance Agency's mission is to ensure that the Enterprises and FHLBanks operate in a safe and sound manner so that they serve as a reliable source of liquidity and funding for housing finance and community investment. The Finance Agency establishes policies and regulations governing the operations of the Enterprises and FHLBanks. Each FHLBank operates as a separate entity with its own management, employees, and board of directors. The FHLBanks are government-sponsored enterprises (GSEs) that serve the public by enhancing the availability of funds for residential mortgages and targeted community development. The Bank provides a readily available source of funding to its member institutions and eligible housing associates in Alaska, Hawaii, Idaho, Iowa, Minnesota, Missouri, Montana, North Dakota, Oregon, South Dakota, Utah, Washington, Wyoming, and the U.S. Pacific territories of American Samoa, Guam, and the Commonwealth of the Northern Mariana Islands. Commercial banks, savings institutions, credit unions, insurance companies, and community development financial institutions (CDFIs) may apply for membership. State and local housing associates that meet certain statutory criteria may also borrow from the Bank; while eligible to borrow, housing associates are not members of the Bank and, as such, are not permitted to hold capital stock. The Bank is a cooperative. This means the Bank is owned by its customers, whom the Bank calls members. As a condition of membership in the Bank, all members must purchase and maintain membership capital stock based on a percentage of their total assets, subject to a minimum and maximum amount, as of the preceding December 31 st . Each member is also required to purchase and maintain activity-based capital stock to support certain business activities with the Bank. The Bank's current and former members own all of the outstanding capital stock of the Bank. Former members own capital stock (included in mandatorily redeemable capital stock) to support business transactions still carried on the Bank's Statements of Condition. All stockholders, including current and former members, may receive dividends on their capital stock investment to the extent declared by the Bank's Board of Directors.

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation [Text Block]	Basis of Presentation The accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information. Accordingly, they do not include all of the disclosures required by GAAP for annual financial statements and should be read in conjunction with the audited financial statements for the year ended December 31, 2016 , which are contained in the Bank's 2016 Annual Report on Form 10-K filed with the SEC on March 21, 2017 ( 2016 Form 10-K). In the opinion of management, the unaudited financial information is complete and reflects all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of results for the interim periods. The preparation of financial statements in accordance with GAAP requires management to make assumptions and estimates that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates. The results of operations for interim periods are not necessarily indicative of the results to be expected for the full year ending December 31, 2017. FHLB Des Moines Headquarters. The Bank leases its headquarters office space from Wells Fargo Bank. On June 22, 2017, a storm pipe broke at the Bank's headquarters causing significant water damage to the Bank's office space rendering it totally uninhabitable. From June 23 through July 14 of this year, the Bank utilized its back-up data center, and employees worked out of a business recovery center located in Urbandale, Iowa, additional leased space in downtown Des Moines, and remotely. On July 17, 2017, the Bank resumed use of its primary data center at its headquarters; however, staff continue to work from alternative locations. Through the date of this filing, there have been no material disruptions to the Bank's operations or to its ability to serve its members. The Bank incurred immaterial expenses related to damages caused by the storm drain break during the second quarter of 2017. The Bank expects additional expenses, including the write-off of equipment and lease costs related to the lease of back-up office space, to be incurred during the third quarter 2017. At this time, the full amount of combined property damage and recoveries cannot be estimated, and accordingly, no additional amounts, including amounts for insurance recoveries, have been recorded in the Bank's financial statements as of June 30, 2017. The Bank expects that insurance, less applicable deductibles, will cover the majority of the costs incurred to maintain operations, repair or replace damaged Bank property and assets, and restore the premises to the condition it was in prior to the time the water damage occurred. The timing is uncertain as to when the repairs to the Bank's headquarters will be completed and the Bank's office space will be ready for re-occupancy. The total impact of the water damage is not expected, however, to materially impact the Bank's financial condition or results of operations. SIGNIFICANT ACCOUNTING POLICIES There have been no material changes to the Bank's significant accounting policies during the six months ended June 30, 2017 , with the exception of one policy noted below which was updated in the first quarter 2017 Form 10-Q. Descriptions of all significant accounting policies are included in "Note 1 - Summary of Significant Accounting Policies" in the 2016 Form 10-K. Derivatives. All derivatives are recognized on the Statements of Condition at their fair values and reported as either derivative assets or derivative liabilities, net of cash collateral, including initial margin, and accrued interest received from or pledged to clearing agents and/or counterparties. The fair values of derivatives are netted by clearing agent and/or counterparty when the netting requirements have been met. If these netted amounts are positive, they are classified as a derivative asset and, if negative, they are classified as a derivative liability. Cash flows associated with derivatives are reflected as cash flows from operating activities in the Statements of Cash Flows unless the derivative meets the criteria to be a financing derivative. The Bank utilizes one Derivative Clearing Organization (Clearinghouse), CME Clearing, for all cleared derivative transactions. Effective January 3, 2017, CME Clearing made certain amendments to its rulebook changing the legal characterization of variation margin payments to be daily settlement payments, which are a component of the derivative fair value, rather than collateral. Initial margin is considered cash collateral.

Recently Adopted and Issued Acc

Recently Adopted and Issued Accounting Guidance	6 Months Ended
	Jun. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recently Adopted and Issued Accounting Guidance [Text Block]	Recently Adopted and Issued Accounting Guidance ADOPTED ACCOUNTING GUIDANCE Contingent Put and Call Options in Debt Instruments On March 14, 2016, the Financial Accounting Standards Board (FASB) issued amendments to clarify the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. The guidance requires entities to apply only the four-step decision sequence when assessing whether the economic characteristics and risks of call (put) options are clearly and closely related to the economic characteristics and risks of their debt hosts. Consequently, when a call (put) option is contingently exercisable, an entity does not have to assess whether the event that triggers the ability to exercise a call (put) option is related to interest rates or credit risks. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2017. The adoption of this guidance did not have an effect on the Bank's financial conditions, results of operations, or cash flows. ISSUED ACCOUNTING GUIDANCE Premium Amortization on Purchased Callable Debt Securities On March 30, 2017, FASB issued guidance for the amortization period for certain purchased callable debt securities held at a premium. Specifically, this guidance requires the premium to be amortized to the earliest call date. This guidance does not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. This guidance affects all entities that hold investments in callable debt securities that have an amortized cost basis in excess of the amount that is repayable by the issuer at the earliest call date (that is, at a premium). This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2019, and early adoption is permitted. This guidance should be applied using a modified retrospective method through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Bank is in the process of evaluating this guidance, but its effect on the Bank's financial condition, results of operations, and cash flows has not yet been determined. Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost On March 10, 2017, the FASB issued the guidance to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. This guidance requires entities to disaggregate the service cost component from the other components of net benefit cost. The guidance also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2018, and early adoption is permitted. This guidance should be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement and prospectively, on and after the effective date, for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The Bank is in the process of evaluating this guidance, but its effect on the Banks’ financial condition, results of operations, and cash flows has not yet been determined. Classification of Certain Cash Receipts and Cash Payments On August 26, 2016, the FASB issued amendments to clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. This guidance is intended to reduce existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2018, and early adoption is permitted. This guidance should be applied using a retrospective transition method to each period presented. The Bank does not intend to adopt this guidance early. The adoption of this guidance will have no effect on the Bank's financial condition, results of operations, or cash flows. Measurement of Credit Losses on Financial Instruments On June 16, 2016, the FASB issued amended guidance for the accounting of credit losses on financial instruments. The amendments require entities to measure expected credit losses based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The new guidance requires a financial asset, or a group of financial assets, measured at amortized cost to be presented at the net amount expected to be collected. The guidance also requires, among other things, the following: • The statement of income to reflect the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. • Entities to determine the allowance for credit losses for purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (PCD assets) that are measured at amortized cost in a similar manner to other financial assets measured at amortized cost. The initial allowance for credit losses is required to be added to the purchase price of the assets acquired. • Entities to record credit losses relating to available-for-sale (AFS) debt securities through an allowance for credit losses. The amendments limit the allowance for credit losses to the amount by which fair value is below amortized cost. • Public entities to further disaggregate the current disclosure of credit quality indicators in relation to the amortized cost of financing receivables by the year of origination (i.e., vintage). This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2020. Early application is permitted as of the interim and annual reporting periods beginning after December 15, 2018. This guidance should be applied using a modified-retrospective approach, through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. In addition, entities are required to use a prospective transition approach for PCD assets upon adoption and for debt securities for which an other-than-temporary impairment had been recognized before the effective date. The Bank does not intend to adopt the new guidance early. While the Bank is in the process of evaluating this guidance, the Bank expects the adoption of the guidance may result in an increase in the allowance for credit losses, including an allowance for debt securities, given the requirement to assess losses for the entire estimated life of the financial asset. The effect on the Bank's financial condition, results of operations, and cash flows will depend upon the composition of financial assets held by the Bank at the adoption date as well as the economic conditions and forecasts at that time. Leases On February 25, 2016, the FASB issued guidance which requires recognition of lease assets and lease liabilities on the statement of condition and disclosure of key information about leasing arrangements. Specifically, this guidance requires a lessee, of operating or finance leases, to recognize on the statement of condition a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities. Under previous GAAP, a lessee was not required to recognize lease assets and lease liabilities arising from operating leases on the statement of condition. While this guidance does not fundamentally change lessor accounting, some changes have been made to align that guidance with the lessee guidance and other areas within GAAP. This guidance becomes effective for the Bank for the interim and annual periods beginning on January 1, 2019, and early application is permitted. This guidance requires lessors and lessees to recognize and measure leases at the beginning of the earliest period presented in the financial statements using a modified retrospective approach. The Bank does not intend to adopt this new guidance early. Upon adoption, the Bank expects to report higher assets and liabilities as a result of recording right-of-use assets and lease liabilities on its statements of condition. The Bank is in the process of evaluating this guidance, but its effect on the Bank's financial condition, results of operations, or cash flows has not yet been determined. Recognition and Measurement of Financial Assets and Financial Liabilities On January 5, 2016, the FASB issued amended guidance on certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. This guidance includes, but is not limited to, the following: • Requires an entity to present separately in other comprehensive income (OCI) the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. • Requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the statements of condition or the accompanying notes to the financial statements. • Eliminates the requirement for public entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the statements of condition. This guidance becomes effective for the Bank for the interim and annual periods beginning on January 1, 2018, and early adoption is only permitted for certain provisions. The amendments, in general, should be applied by means of a cumulative-effect adjustment to the statements of condition as of the beginning of the period of adoption. While this guidance will affect the Bank's disclosures, the Bank does not expect the requirement to present the instrument-specific credit risk in OCI to have a material effect on the Bank's financial condition, results of operations, or cash flows. Revenue from Contracts with Customers On May 28, 2014, the FASB issued guidance on revenue from contracts with customers. This guidance outlines a single comprehensive model for recognizing revenue arising from contracts with customers and supersedes most current revenue recognition guidance. In addition, this guidance amends the existing requirements for the recognition of a gain or loss on the transfer of non-financial assets that are not in a contract with a customer. This guidance applies to all contracts with customers except those that are within the scope of certain other standards, such as financial instruments, certain guarantees, insurance contracts, and lease contracts. The guidance provides entities with the option of using either of the following adoption methods: a full retrospective method, retrospectively to each prior reporting period presented; or a modified retrospective method, retrospectively with the cumulative effect of initially applying this guidance recognized at the date of initial application. On August 12, 2015, the FASB issued an amendment to defer the effective date of this guidance issued in May 2014 by one year. In 2016, the FASB has issued additional amendments to clarify certain aspects of the new revenue guidance. However, these amendments do not change the core principle in the new revenue standard. This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2018. Early application is permitted only as of the interim and annual reporting periods beginning after December 15, 2016. The Bank does not intend to adopt this new guidance early. Given that the majority of the Bank's financial instruments and other contractual rights that generate revenue are covered by other U.S. GAAP, the effect of this guidance on the Bank's financial condition, results of operations, and cash flows is not expected to be material.

Trading Securities

Trading Securities	6 Months Ended
	Jun. 30, 2017
Trading Securities [Abstract]
Trading Securities [Text Block]	Trading Securities MAJOR SECURITY TYPES Trading securities were as follows (dollars in millions): June 30, December 31, Non-mortgage-backed securities Other U.S. obligations 1 $ 207 $ 216 GSE and Tennessee Valley Authority obligations 1,612 1,611 Other 2 275 273 Total non-mortgage-backed securities 2,094 2,100 Mortgage-backed securities GSE multifamily 455 453 Total fair value $ 2,549 $ 2,553 1 Represents investment securities backed by the full faith and credit of the U.S. Government. 2 Consists of taxable municipal bonds. NET GAINS (LOSSES) ON TRADING SECURITIES The Bank did not sell any trading securities during the three and six months ended June 30, 2017 and 2016 . During the three and six months ended June 30, 2017 , the Bank recorded net holding gains of $4 million and $9 million on its trading securities compared to net holding gains of $18 million and $53 million for the same periods in 2016 .

Available-for-Sale Securities

Available-for-Sale Securities	6 Months Ended
	Jun. 30, 2017
Available-for-sale Securities [Abstract]
Available-for-Sale Securities [Text Block]	Available-for-Sale Securities MAJOR SECURITY TYPES AFS securities we re as follows (dollars in millions): June 30, 2017 Amortized 1 Gross Gross Fair Value Non-mortgage-backed securities Other U.S. obligations 2 $ 3,325 $ 5 $ (7 ) $ 3,323 GSE and Tennessee Valley Authority obligations 1,278 26 — 1,304 State or local housing agency obligations 989 — (1 ) 988 Other 3 273 8 — 281 Total non-mortgage-backed securities 5,865 39 (8 ) 5,896 Mortgage-backed securities Other U.S. obligations single-family 2 3,936 12 (2 ) 3,946 GSE single-family 1,116 9 — 1,125 GSE multifamily 11,395 51 (10 ) 11,436 Total mortgage-backed securities 16,447 72 (12 ) 16,507 Total $ 22,312 $ 111 $ (20 ) $ 22,403 December 31, 2016 Amortized 1 Gross Gross Fair Value Non-mortgage-backed securities Other U.S. obligations 2 $ 3,537 $ 5 $ (13 ) $ 3,529 GSE and Tennessee Valley Authority obligations 1,341 11 (1 ) 1,351 State or local housing agency obligations 1,010 — (1 ) 1,009 Other 3 272 6 — 278 Total non-mortgage-backed securities 6,160 22 (15 ) 6,167 Mortgage-backed securities Other U.S. obligations single-family 2 3,852 2 (16 ) 3,838 GSE single-family 1,257 7 (3 ) 1,261 GSE multifamily 11,714 30 (41 ) 11,703 Total mortgage-backed securities 16,823 39 (60 ) 16,802 Total $ 22,983 $ 61 $ (75 ) $ 22,969 1 Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments. 2 Represents investment securities backed by the full faith and credit of the U.S. Government. 3 Consists of taxable municipal bonds and/or Private Export Funding Corporation (PEFCO) bonds. UNREALIZED LOSSES The following tables summarize AFS securities with unrealized losses by major security type and length of time that individual securities have been in a continuous unrealized loss position (dollars in millions). In cases where the gross unrealized losses for an investment category are less than $1 million, the losses are not reported. June 30, 2017 Less than 12 Months 12 Months or More Total Fair Unrealized Losses Fair Unrealized Losses Fair Unrealized Losses Non-mortgage-backed securities Other U.S. obligations 1 $ 305 $ (1 ) $ 2,356 $ (6 ) $ 2,661 $ (7 ) State or local housing agency obligations 53 — 628 (1 ) 681 (1 ) Total non-mortgage-backed securities 358 (1 ) 2,984 (7 ) 3,342 (8 ) Mortgage-backed securities Other U.S. obligations single-family 1 — — 1,335 (2 ) 1,335 (2 ) GSE single-family 115 — 61 — 176 — GSE multifamily 544 — 3,293 (10 ) 3,837 (10 ) Total mortgage-backed securities 659 — 4,689 (12 ) 5,348 (12 ) Total $ 1,017 $ (1 ) $ 7,673 $ (19 ) $ 8,690 $ (20 ) December 31, 2016 Less than 12 Months 12 Months or More Total Fair Unrealized Losses Fair Unrealized Losses Fair Unrealized Losses Non-mortgage-backed securities Other U.S. obligations 1 $ 209 $ — $ 2,972 $ (12 ) $ 3,181 $ (12 ) GSE and Tennessee Valley Authority obligations — — 126 (1 ) 126 (1 ) State or local housing agency obligations 354 (1 ) 395 (1 ) 749 (2 ) Total non-mortgage-backed securities 563 (1 ) 3,493 (14 ) 4,056 (15 ) Mortgage-backed securities Other U.S. obligations single-family 1 1,123 (2 ) 2,076 (14 ) 3,199 (16 ) GSE single-family 545 (3 ) 32 — 577 (3 ) GSE multifamily 2,713 (6 ) 6,315 (35 ) 9,028 (41 ) Total mortgage-backed securities 4,381 (11 ) 8,423 (49 ) 12,804 (60 ) Total $ 4,944 $ (12 ) $ 11,916 $ (63 ) $ 16,860 $ (75 ) 1 Represents investment securities backed by the full faith and credit of the U.S. Government. CONTRACTUAL MATURITY The following table summarizes AFS securities by contractual maturity. Expected maturities of some securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment fees (dollars in millions): June 30, 2017 December 31, 2016 Year of Contractual Maturity Amortized Fair Value Amortized Fair Value Non-mortgage-backed securities Due in one year or less $ 227 $ 231 $ 133 $ 134 Due after one year through five years 727 731 489 496 Due after five years through ten years 3,858 3,862 4,452 4,447 Due after ten years 1,053 1,072 1,086 1,090 Total non-mortgage-backed securities 5,865 5,896 6,160 6,167 Mortgage-backed securities 16,447 16,507 16,823 16,802 Total $ 22,312 $ 22,403 $ 22,983 $ 22,969

Held-to-Maturity Securities

Held-to-Maturity Securities	6 Months Ended
	Jun. 30, 2017
Held-to-maturity Securities, Unclassified [Abstract]
Held-to-Maturity Securities [Text Block]	Held-to-Maturity Securities MAJOR SECURITY TYPES Held-to-maturity (HTM) securities wer e as follows (dollars in millions): June 30, 2017 Amortized 1 Gross Gross Fair Value Non-mortgage-backed securities GSE and Tennessee Valley Authority obligations $ 395 $ 66 $ — $ 461 State or local housing agency obligations 655 2 (9 ) 648 Total non-mortgage-backed securities 1,050 68 (9 ) 1,109 Mortgage-backed securities Other U.S. obligations single-family 2 20 — — 20 Other U.S. obligations commercial 2 3 — — 3 GSE single-family 3,122 7 (10 ) 3,119 Private-label residential 14 — — 14 Total mortgage-backed securities 3,159 7 (10 ) 3,156 Total $ 4,209 $ 75 $ (19 ) $ 4,265 December 31, 2016 Amortized 1 Gross Gross Fair Value Non-mortgage-backed securities GSE and Tennessee Valley Authority obligations $ 397 $ 60 $ (1 ) $ 456 State or local housing agency obligations 688 1 (11 ) 678 Total non-mortgage-backed securities 1,085 61 (12 ) 1,134 Mortgage-backed securities Other U.S. obligations single-family 2 26 — — 26 Other U.S. obligations commercial 2 4 — — 4 GSE single-family 3,543 4 (20 ) 3,527 Private-label residential 16 — (1 ) 15 Total mortgage-backed securities 3,589 4 (21 ) 3,572 Total $ 4,674 $ 65 $ (33 ) $ 4,706 1 Amortized cost includes adjustments made to the cost basis of an investment for accretion or amortization. 2 Represents investment securities backed by the full faith and credit of the U.S. Government. UNREALIZED LOSSES The following tables summarize HTM securities with unrealized losses by major security type and the length of time that individual securities have been in a continuous unrealized loss position (dollars in millions). In cases where the gross unrealized losses for an investment category are less than $1 million, the losses are not reported. June 30, 2017 Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Non-mortgage-backed securities State or local housing agency obligations $ 1 $ — $ 268 $ (9 ) $ 269 $ (9 ) Total non-mortgage-backed securities 1 — 268 (9 ) 269 (9 ) Mortgage-backed securities Other U.S. obligations single-family 1 10 — 1 — 11 — Other U.S. obligations commercial 1 — — 2 — 2 — GSE single-family 800 (7 ) 937 (3 ) 1,737 (10 ) Private-label residential — — 9 — 9 — Total mortgage-backed securities 810 (7 ) 949 (3 ) 1,759 (10 ) Total $ 811 $ (7 ) $ 1,217 $ (12 ) $ 2,028 $ (19 ) December 31, 2016 Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Non-mortgage backed securities GSE and Tennessee Valley Authority obligations $ 73 $ (1 ) $ — $ — $ 73 $ (1 ) State or local housing agency obligations 291 (11 ) 10 — 301 (11 ) Total non-mortgage-backed securities 364 (12 ) 10 — 374 (12 ) Mortgage-backed securities Other U.S. obligations single-family 1 12 — — — 12 — Other U.S. obligations commercial 1 — — 3 — 3 — GSE single-family 1,918 (15 ) 1,224 (5 ) 3,142 (20 ) Private-label residential 5 — 10 (1 ) 15 (1 ) Total mortgage-backed securities 1,935 (15 ) 1,237 (6 ) 3,172 (21 ) Total $ 2,299 $ (27 ) $ 1,247 $ (6 ) $ 3,546 $ (33 ) 1 Represents investment securities backed by the full faith and credit of the U.S. Government. CONTRACTUAL MATURITY The following table summarizes HTM securities by contractual maturity. Expected maturities of some securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment fees (dollars in millions): June 30, 2017 December 31, 2016 Year of Contractual Maturity Amortized Fair Value Amortized Fair Value Non-mortgage-backed securities Due in one year or less $ 11 $ 11 $ 11 $ 11 Due after one year through five years 55 55 62 62 Due after five years through ten years 363 397 367 399 Due after ten years 621 646 645 662 Total non-mortgage-backed securities 1,050 1,109 1,085 1,134 Mortgage-backed securities 3,159 3,156 3,589 3,572 Total $ 4,209 $ 4,265 $ 4,674 $ 4,706

Other-Than-Temporary Impairment

Other-Than-Temporary Impairment	6 Months Ended
	Jun. 30, 2017
Other than Temporary Impairment Losses, Investments [Abstract]
Other-Than-Temporary Impairment [Text Block]	Other-Than-Temporary Impairment The Bank evaluates its individual AFS and HTM securities in an unrealized loss position for other-than-temporary impairment (OTTI) on a quarterly basis. As part of its evaluation of securities for OTTI, the Bank considers its intent to sell each debt security and whether it is more likely than not that it will be required to sell the security before its anticipated recovery. If either of these conditions is met, the Bank will recognize an OTTI charge to earnings equal to the entire difference between the security's amortized cost basis and its fair value at the reporting date. For securities in an unrealized loss position that meet neither of these conditions, the Bank performs analyses to determine if any of these securities are other-than-temporarily impaired. The analysis of the Bank's AFS and HTM investment securities in an unrealized loss position at June 30, 2017 is discussed below: • Other U.S. obligations and GSE and Tennessee Valley Authority obligations. The unrealized losses were due primarily to changes in interest rates and credit spreads, and not to a significant deterioration in the fundamental credit quality of the obligations. The strength of the issuers' guarantees through direct obligations or support from the U.S. Government was sufficient to protect the Bank from losses based on current expectations. The Bank expects to recover the amortized cost bases on these 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 recovery of their amortized cost bases. As such, the Bank did not consider these securities to be other-than-temporarily impaired at June 30, 2017 . • State or local housing agency obligations . The unrealized losses were due to changes in interest rates, credit spreads, and illiquidity in the credit markets, and not to a significant deterioration in the fundamental credit quality of the obligations. The creditworthiness of the issuers and the strength of the underlying collateral and credit enhancements were sufficient to protect the Bank from losses based on current expectations. The Bank does not intend to sell these securities nor is it more likely than not that it will be required to sell these securities before recovery of their amortized cost bases. As such, the Bank did not consider these securities to be other-than-temporarily impaired at June 30, 2017 . • Private-label residential mortgage-backed securities. On a quarterly basis, the Bank engages other designated FHLBanks to perform cash flow analyses on its private-label mortgage-backed securities (private-label MBS). As of June 30, 2017 , the Bank compared the present value of cash flows expected to be collected with respect to its private-label MBS to the amortized cost bases of the securities to determine whether a credit loss existed. At June 30, 2017 , the Bank's cash flow analyses for private-label MBS did not project any credit losses. The Bank does not intend to sell its private-label MBS nor is it more likely than not that the Bank will be required to sell its private-label MBS before recovery of their amortized cost bases. As a result, the Bank did not consider any of its private-label MBS to be other-than-temporarily impaired at June 30, 2017 .

Advances

Advances	6 Months Ended
	Jun. 30, 2017
Advances [Abstract]
Advances [Text Block]	Advances CONTRACTUAL MATURITY The following table summarizes the Bank's advances outstanding by contractual maturity (dollars in millions): June 30, 2017 December 31, 2016 Year of Contractual Maturity Amount Weighted Amount Weighted Overdrawn demand deposit accounts $ 3 4.31 % $ 1 3.81 % Due in one year or less 42,781 1.45 22,532 1.13 Due after one year through two years 19,797 1.45 29,791 1.12 Due after two years through three years 14,030 1.48 30,023 0.98 Due after three years through four years 21,118 1.41 17,615 1.00 Due after four years through five years 8,707 1.72 17,197 1.11 Thereafter 12,402 1.80 14,378 1.11 Total par value 118,838 1.50 % 131,537 1.07 % Premiums 65 83 Discounts (5 ) (7 ) Fair value hedging adjustments (20 ) (12 ) Total $ 118,878 $ 131,601 The following table summarizes all advances by year of contractual maturity or next call date for callable advances, and by year of contractual maturity or next put date for putable advances (dollars in millions): Year of Contractual Maturity Year of Contractual Maturity or Next Put Date June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 Overdrawn demand deposit accounts $ 3 $ 1 $ 3 $ 1 Due in one year or less 79,669 93,471 43,130 23,532 Due after one year through two years 17,712 9,978 19,640 28,983 Due after two years through three years 9,390 15,515 14,030 30,023 Due after three years through four years 2,841 2,734 20,980 17,615 Due after four years through five years 6,906 7,670 8,674 17,026 Thereafter 2,317 2,168 12,381 14,357 Total par value $ 118,838 $ 131,537 $ 118,838 $ 131,537 The Bank offers advances to members and eligible housing associates that may be prepaid on pertinent dates (call dates) prior to maturity without incurring prepayment fees (callable advances). Other advances may only be prepaid by paying a fee to the Bank (prepayment fee) that makes the Bank financially indifferent to the prepayment of the advance. At June 30, 2017 and December 31, 2016 , the Bank had callable advances outstanding totaling $45.5 billion and $78.5 billion . The Bank also offers putable advances. With a putable advance, the Bank has the right to terminate the advance from the borrower on the predetermined exercise dates. Generally, these put options are exercised when interest rates increase relative to contractual rates. At June 30, 2017 and December 31, 2016 , t he Bank had putable advances outstanding totaling $1.3 billion and $1.9 billion . PREPAYMENT FEES The Bank generally charges a prepayment fee for advances that a borrower elects to terminate prior to the stated maturity or outside of a predetermined call or put date. The fees charged are priced to make the Bank financially indifferent to the prepayment of the advance. For certain advances with symmetrical prepayment features, 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. Prepayment fees and credits are recorded net of fair value hedging adjustments in the Statements of Income. The following table summarizes the Bank's prepayment fees on advances, net (dollars in millions): For the Three Months Ended For the Six Months Ended June 30, June 30, 2017 2016 2017 2016 Prepayment fee income $ 1 $ 2 $ 1 $ 9 Fair value hedging adjustments 1 — (1 ) — (4 ) Prepayment fees on advances, net $ 1 $ 1 $ 1 $ 5 1 Represents the amortization/accretion of fair value hedging adjustments on closed advance hedge relationships resulting from advance prepayments. CREDIT RISK EXPOSURE AND SECURITY TERMS The Bank's potential credit risk from advances is concentrated in commercial banks, savings institutions, and insurance companies. At June 30, 2017 and December 31, 2016 , the Bank had outstanding advances of $63 billion and $77 billion to one member that individually held 10 percent or more of the Bank's advances, which represents 53 percent and 59 percent of total outstanding advances. For information related to the Bank's credit risk exposure on advances, refer to "Note 9 — Allowance for Credit Losses."

Mortgage Loans Held for Portfol

Mortgage Loans Held for Portfolio	6 Months Ended
	Jun. 30, 2017
Mortgage Loans on Real Estate [Abstract]
Mortgage Loans Held for Portfolio [Text Block]	Mortgage Loans Held for Portfolio The Bank participates in the Mortgage Partnership Finance (MPF) program (Mortgage Partnership Finance and MPF are registered trademarks of the FHLBank of Chicago). This program involves investment by the Bank in single-family mortgage loans held for portfolio that are either purchased from participating financial institutions (PFIs) or funded by the Bank through PFIs. MPF loans may also be acquired through participations in pools of eligible mortgage loans purchased from other FHLBanks. The Bank's MPF PFIs generally originate, service, and credit enhance mortgage loans that are sold to the Bank. MPF PFIs participating in the servicing release program do not service the loans owned by the Bank. The servicing on these loans is sold concurrently by the MPF PFI to a designated mortgage service provider. Effective May 31, 2015, as a part of the merger with the Federal Home Loan Bank of Seattle (Seattle Bank) (the Merger), the Bank acquired mortgage loans previously purchased by the Seattle Bank under the Mortgage Purchase Program (MPP). This program involved investment by the Seattle Bank in single-family mortgage loans that were purchased directly from MPP PFIs. Similar to the MPF program, MPP PFIs generally originated, serviced, and credit enhanced the mortgage loans sold to the Seattle Bank. In 2005, the Seattle Bank ceased entering into new MPP master commitment contracts and therefore all MPP loans acquired by the Bank were originated prior to 2006. The Bank does not currently purchase mortgage loans under this program. The following tables present information on the Bank's mortgage loans held for portfolio (dollars in millions): June 30, 2017 MPF MPP Total Fixed rate, long-term single-family mortgage loans $ 5,440 $ 347 $ 5,787 Fixed rate, medium-term 1 single-family mortgage loans 1,071 3 1,074 Total unpaid principal balance 6,511 350 6,861 Premiums 85 11 96 Discounts (7 ) — (7 ) Basis adjustments from mortgage loan commitments 5 — 5 Total mortgage loans held for portfolio 6,594 361 6,955 Allowance for credit losses (2 ) — (2 ) Total mortgage loans held for portfolio, net $ 6,592 $ 361 $ 6,953 December 31, 2016 MPF MPP Total Fixed rate, long-term single-family mortgage loans $ 5,272 $ 397 $ 5,669 Fixed rate, medium-term 1 single-family mortgage loans 1,148 6 1,154 Total unpaid principal balance 6,420 403 6,823 Premiums 82 14 96 Discounts (8 ) (1 ) (9 ) Basis adjustments from mortgage loan commitments 5 — 5 Total mortgage loans held for portfolio 6,499 416 6,915 Allowance for credit losses (2 ) — (2 ) Total mortgage loans held for portfolio, net $ 6,497 $ 416 $ 6,913 1 Medium-term is defined as a term of 15 years or less. The following tables present the Bank's mortgage loans held for portfolio by collateral or guarantee type (dollars in millions): June 30, 2017 MPF MPP Total Conventional mortgage loans $ 6,007 $ 315 $ 6,322 Government-insured mortgage loans 504 35 539 Total unpaid principal balance $ 6,511 $ 350 $ 6,861 December 31, 2016 MPF MPP Total Conventional mortgage loans $ 5,907 $ 361 $ 6,268 Government-insured mortgage loans 513 42 555 Total unpaid principal balance $ 6,420 $ 403 $ 6,823 For information related to the Bank's credit risk exposure on mortgage loans held for portfolio, refer to "Note 9 — Allowance for Credit Losses."

Allowance for Credit Losses

Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2017
Allowance for Credit Losses [Abstract]
Allowance for Credit Losses [Text Block]	Allowance for Credit Losses The Bank has established an allowance for credit losses methodology for each of its financing receivable portfolio segments: advances, standby letters of credit, and other extensions of credit to borrowers (collectively, credit products), government-insured mortgage loans held for portfolio, MPF conventional mortgage loans held for portfolio, MPP conventional mortgage loans held for portfolio, and term securities purchased under agreements to resell. CREDIT PRODUCTS The Bank manages its credit exposure to credit products through an approach that includes establishing a credit limit for each borrower, ongoing reviews of each borrower's financial condition, and detailed collateral and lending policies to limit risk of loss while balancing borrowers' needs for a reliable source of funding. In addition, the Bank lends to eligible borrowers in accordance with the FHLBank Act, Finance Agency regulations, and other applicable laws. The Bank is required by regulation to obtain sufficient collateral to fully secure credit products. The estimated value of the collateral required to secure each borrower's credit products is calculated by applying collateral discounts, or haircuts, to the unpaid principal balance or market value, if available, of the collateral. Eligible collateral includes (i) whole first mortgages on improved residential real property or securities representing a whole interest in such mortgages, (ii) loans and securities issued, insured, or guaranteed by the U.S. Government or any agency thereof, including mortgage-backed securities (MBS) issued or guaranteed by Fannie Mae, Freddie Mac, or Government National Mortgage Association and Federal Family Education Loan Program guaranteed student loans, (iii) cash deposited with the Bank, and (iv) other real estate-related collateral acceptable to the Bank provided such collateral has a readily ascertainable value and the Bank can perfect a security interest in such property. In addition, community financial institutions may also pledge collateral consisting of secured small business, small agri-business, or small farm loans. As additional security, the FHLBank Act provides that the Bank has a lien on each member's capital stock investment; however, capital stock cannot be pledged as collateral to secure credit exposures. Collateral arrangements may vary depending upon borrower credit quality, financial condition and performance, borrowing capacity, and overall credit exposure to the borrower. The Bank can also require additional or substitute collateral to protect its security interest. The Bank periodically evaluates and makes changes to its collateral guidelines and collateral haircuts. Borrowers may pledge collateral to the Bank by executing a blanket lien, specifically assigning collateral, or placing physical possession of collateral with the Bank or its custodians. The Bank perfects its security interest in all pledged collateral by filing Uniform Commercial Code financing statements or by taking possession or control of the collateral. Under the FHLBank Act, any security interest granted to the Bank by its members, or any affiliates of its members, has priority over the claims and rights of any party (including any receiver, conservator, trustee, or similar party having rights of a lien creditor), unless those claims and rights would be entitled to priority under otherwise applicable law and are held by actual purchasers or by parties that have perfected security interests. Under a blanket lien, the Bank is granted a security interest in all financial assets of the borrower to fully secure the borrower's obligation. Other than securities and cash deposits, the Bank does not initially take delivery of collateral pledged by blanket lien borrowers. In the event of deterioration in the financial condition of a blanket lien borrower, the Bank has the ability to require delivery of pledged collateral sufficient to secure the borrower's obligation. With respect to non-blanket lien borrowers that are federally insured, the Bank generally requires collateral to be specifically assigned. With respect to non-blanket lien borrowers that are not federally insured (typically insurance companies, CDFIs, and housing associates), the Bank generally takes control of collateral through the delivery of cash, securities, or loans to the Bank or its custodians. Using a risk-based approach and taking into consideration each borrower's financial strength, the Bank considers the types and level of collateral to be the primary indicator of credit quality on its credit products. At June 30, 2017 and December 31, 2016 , the Bank had rights to collateral on a borrower-by-borrower basis with an unpaid principal balance or market value, if available, in excess of its outstanding extensions of credit. At June 30, 2017 and December 31, 2016 , none of the Bank's credit products were past due, on non-accrual status, or considered impaired. In addition, there were no troubled debt restructurings (TDRs) related to credit products during the six months ended June 30, 2017 and 2016 . The Bank has never experienced a credit loss on its credit products. Based upon the Bank's collateral and lending policies, the collateral held as security, and the repayment history on credit products, management has determined that there were no probable credit losses on its credit products as of June 30, 2017 and December 31, 2016 . Accordingly, the Bank has not recorded any allowance for credit losses for its credit products. GOVERNMENT-INSURED MORTGAGE LOANS The Bank invests in government-insured fixed rate mortgage loans in both the MPF and MPP portfolios that are insured or guaranteed by the Federal Housing Administration, the Department of Veterans Affairs, and/or the Rural Housing Service of the Department of Agriculture. The servicer or PFI obtains and maintains insurance or a guaranty from the applicable government agency. The servicer or PFI is responsible for compliance with all government agency requirements and for obtaining the benefit of the applicable guarantee or insurance with respect to defaulted government-insured mortgage loans. Any losses incurred on these loans that are not recovered from the insurer/guarantor are absorbed by the servicers. As such, the Bank only has credit risk for these loans if the servicer or PFI fails to pay for losses not covered by the guarantee or insurance. Management views this risk as remote and has never experienced a credit loss on its government-insured mortgage loans. As a result, the Bank did not establish an allowance for credit losses for its government-insured mortgage loans at June 30, 2017 and December 31, 2016 . Furthermore, none of these mortgage loans have been placed on non-accrual status because of the U.S. Government guarantee or insurance on these loans and the contractual obligation of the loan servicer to repurchase the loans when certain criteria are met. MPF CONVENTIONAL MORTGAGE LOANS The Bank's management of credit risk in the MPF program involves several layers of legal loss protection that are defined in agreements among the Bank and its participating PFIs. For conventional MPF loans, the availability of loss protection may differ slightly among MPF products. The Bank's loss protection consists of the following loss layers, in order of priority: • Homeowner Equity. • Primary Mortgage Insurance (PMI). At the time of origination, PMI is required on all loans with homeowner equity of less than 20 percent of the original purchase price or appraised value, whichever is less and as applicable to the specific loan. • First Loss Account (FLA). For each master commitment, the Bank's potential loss exposure prior to the PFI's credit enhancement obligation is estimated and tracked in a memorandum account called the FLA. • Credit Enhancement Obligation of PFI. PFIs have a credit enhancement obligation at the time a mortgage loan is purchased to absorb certain losses in excess of the FLA in order to limit the Bank's loss exposure to that of an investor in an investment grade MBS. PFIs pledge collateral to secure this obligation. MPP CONVENTIONAL MORTGAGE LOANS For conventional MPP loans, the loss protection consists of the following loss layers, in order of priority: • Homeowner Equity. • Primary Mortgage Insurance. At the time of origination, PMI is required on all loans with homeowner equity of less than 20 percent of the original purchase price or appraised value, whichever is less and as applicable to the specific loan. ALLOWANCE METHODOLOGY The Bank utilizes an allowance for credit losses to reserve for estimated losses in its conventional MPF and MPP mortgage loan portfolios at the balance sheet date. The measurement of the Bank's MPF and MPP allowance for credit losses is determined by the following: • reviewing similar conventional mortgage loans for impairment on a collective basis. This evaluation is primarily based on the following factors: (i) current loan delinquencies, (ii) loans migrating to collateral-dependent status, and (iii) actual historical loss severities; • reviewing conventional mortgage loans for impairment on an individual basis; and • estimating additional credit losses in the conventional mortgage loan portfolio. These losses result from other factors that may not be captured in the methodology previously described at the balance sheet date, which include but are not limited to certain quantifiable economic factors, such as unemployment rates and home prices impacting housing markets. The following table summarizes the allowance for credit losses and the recorded investment of the Bank's conventional mortgage loan portfolio by impairment methodology (dollars in millions): MPF MPP 1 Total Allowance for credit losses, June 30, 2017 Collectively evaluated for impairment $ 2 $ — $ 2 Allowance for credit losses, December 31, 2016 Collectively evaluated for impairment $ 2 $ — $ 2 Recorded investment, June 30, 2017 2 Collectively evaluated for impairment $ 6,067 $ 302 $ 6,369 Individually evaluated for impairment, without a related allowance 43 23 66 Total recorded investment $ 6,110 $ 325 $ 6,435 Recorded investment, December 31, 2016 2 Collectively evaluated for impairment $ 5,960 $ 346 $ 6,306 Individually evaluated for impairment, without a related allowance 45 27 72 Total recorded investment $ 6,005 $ 373 $ 6,378 1 The allowance for credit losses on MPP loans was less than $1 million at June 30, 2017 and December 31, 2016. 2 Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs. CREDIT QUALITY INDICATORS Key credit quality indicators for mortgage loans include the migration of past due loans, loans in process of foreclosure, and non-accrual loans. The table below summarizes the Bank's key credit quality indicators for mortgage loans at June 30, 2017 (dollars in millions): June 30, 2017 MPF MPP Conventional Government Conventional Government Total Past due 30 - 59 days $ 46 $ 16 $ 9 $ 4 $ 75 Past due 60 - 89 days 12 5 4 — 21 Past due 90 - 179 days 8 4 3 — 15 Past due 180 days or more 16 5 9 1 31 Total past due mortgage loans 82 30 25 5 142 Total current mortgage loans 6,028 487 300 32 6,847 Total recorded investment of mortgage loans 1 $ 6,110 $ 517 $ 325 $ 37 $ 6,989 In process of foreclosure (included above) 2 $ 12 $ 2 $ 5 $ — $ 19 Serious delinquency rate 3 — % 2 % 4 % 2 % 1 % Past due 90 days or more and still accruing interest 4 $ — $ 9 $ — $ 1 $ 10 Non-accrual mortgage loans 5 $ 29 $ — $ 21 $ — $ 50 1 Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs. 2 Includes loans where the decision of foreclosure or similar alternative such as pursuit of deed-in-lieu has been reported. Loans in process of foreclosure are included in past due or current loans depending on their payment status. 3 Represents mortgage loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total recorded investment. 4 Represents government-insured mortgage loans that are 90 days or more past due. 5 Represents conventional mortgage loans that are 90 days or more past due and TDRs. The table below summarizes the Bank's key credit quality indicators for mortgage loans at December 31, 2016 (dollars in millions): December 31, 2016 MPF MPP Conventional Government Conventional Government Total Past due 30 - 59 days $ 50 $ 18 $ 11 $ 4 $ 83 Past due 60 - 89 days 17 7 5 2 31 Past due 90 - 179 days 9 6 2 1 18 Past due 180 days or more 22 5 12 2 41 Total past due mortgage loans 98 36 30 9 173 Total current mortgage loans 5,907 491 343 35 6,776 Total recorded investment of mortgage loans 1 $ 6,005 $ 527 $ 373 $ 44 $ 6,949 In process of foreclosure (included above) 2 $ 16 $ 2 $ 7 $ — $ 25 Serious delinquency rate 3 1 % 2 % 4 % 7 % 1 % Past due 90 days or more and still accruing interest 4 $ — $ 11 $ — $ 3 $ 14 Non-accrual mortgage loans 5 $ 36 $ — $ 24 $ — $ 60 1 Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs. 2 Includes loans where the decision of foreclosure or similar alternative such as pursuit of deed-in-lieu has been reported. Loans in process of foreclosure are included in past due or current loans depending on their payment status. 3 Represents mortgage loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total recorded investment. 4 Represents government-insured mortgage loans that are 90 days or more past due. 5 Represents conventional mortgage loans that are 90 days or more past due and TDRs. INDIVIDUALLY EVALUATED IMPAIRED LOANS As previously described, the Bank evaluates certain conventional mortgage loans for impairment individually. A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect all amounts due according to the contractual terms of the loan agreement. The Bank did no t recognize any interest income on impaired loans during the six months ended June 30, 2017 and 2016 . The following table summarizes the average recorded investment of the Bank's individually evaluated impaired loans (dollars in millions): For the Three Months Ended For the Six Months Ended June 30, June 30, 2017 2016 2017 2016 Impaired loans without an allowance Conventional MPF Loans $ 45 $ 34 $ 44 $ 35 Conventional MPP Loans 23 27 25 28 Total $ 68 $ 61 $ 69 $ 63 TERM SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL Term securities purchased under agreements to resell are considered collateralized financing agreements and represent short-term investments. The terms of these investments are structured such that 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. Otherwise, the dollar value of the resale agreement will decrease accordingly. If an agreement to resell is deemed to be impaired, the difference between the fair value of the collateral and the amortized cost of the agreement will be charged to earnings to establish an allowance for credit losses. Based upon the collateral held as security, the Bank determined that no allowance for credit losses was needed for its term securities purchased under agreements to resell at June 30, 2017 and December 31, 2016 . OFF-BALANCE SHEET CREDIT EXPOSURES At June 30, 2017 and December 31, 2016 , the Bank did not record a liability to reflect an allowance for credit losses for off-balance sheet credit exposures. For additional information on the Bank's off-balance sheet credit exposures, see "Note 14 — Commitments and Contingencies."

Derivatives and Hedging Activit

Derivatives and Hedging Activities	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities [Text Block]	Derivatives and Hedging Activities NATURE OF BUSINESS ACTIVITY The Bank is exposed to interest rate risk primarily from the effect of interest rate changes on its interest-earning assets and its related funding sources. The goal of the Bank's interest rate risk management strategy is not to eliminate interest rate risk, but to manage it within appropriate limits. To mitigate the risk of loss, the Bank has established policies and procedures, which include guidelines on the amount of exposure to interest rate changes it is willing to accept. The Bank enters into derivative contracts to manage the interest rate risk exposures inherent in its otherwise unhedged assets and funding positions. Finance Agency regulations and the Bank's Enterprise Risk Management Policy (ERMP) establish guidelines for derivatives, prohibit trading in or the speculative use of derivatives, and limit credit risk arising from derivatives. Derivative financial instruments are used by the Bank to achieve its financial and risk management objectives. The Bank reevaluates its hedging strategies from time to time and may change the hedging techniques it uses or may adopt new strategies. The most common ways in which the Bank uses derivatives are to: • reduce the interest rate sensitivity and repricing gaps of assets and liabilities; • preserve an interest rate spread between the yield of an asset and the cost of the related liability. Without the use of derivatives, this interest rate spread could be reduced or eliminated when a change in the interest rate on the asset does not match a change in the interest rate on the liability; • mitigate the adverse earnings effects of the shortening or extension of certain assets and liabilities; • manage embedded options in assets and liabilities; and • reduce funding costs by combining a derivative with a consolidated obligation, as the cost of a combined funding structure can be lower than the cost of a comparable consolidated obligation. TYPES OF DERIVATIVES The Bank may use the following derivative instruments: • interest rate swaps; • options; • swaptions; • interest rate caps and floors; and • futures/forwards contracts. The Bank may have the following types of hedged items: • investment securities; • advances; • mortgage loans; • consolidated obligations; and • firm commitments. For additional information on the Bank's derivative and hedging accounting policy, see "Note 1 — Basis of Presentation" in this Form 10-Q and "Note 1 — Summary of Significant Accounting Policies" in the 2016 Form 10-K. FINANCIAL STATEMENT EFFECT AND ADDITIONAL FINANCIAL INFORMATION The notional amount of derivatives serves as a factor in determining periodic interest payments and cash flows received and paid. However, the notional amount of derivatives represents neither the actual amounts exchanged nor the overall exposure of the Bank to credit and market risk. The risks of derivatives can be measured meaningfully on a portfolio basis that takes into account the counterparties, the types of derivatives, the items being hedged, and any offsets between the derivatives and the items being hedged. The following table summarizes the Bank's notional amount and the fair value of derivative instruments, including the effect of netting adjustments, cash collateral, and variation margin for daily settled contracts. For purposes of this disclosure, the derivative values include the fair value of derivatives and the related accrued interest (dollars in millions): June 30, 2017 December 31, 2016 Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments (fair value hedges) Interest rate swaps $ 50,686 $ 162 $ 611 $ 51,896 $ 183 $ 688 Derivatives not designated as hedging instruments (economic hedges) Interest rate swaps 1,380 18 55 1,414 20 56 Forward settlement agreements (TBAs) 110 — — 94 1 — Mortgage delivery commitments 113 — — 102 — — Total derivatives not designated as hedging instruments 1,603 18 55 1,610 21 56 Total derivatives before netting and collateral adjustments $ 52,289 180 666 $ 53,506 204 744 Netting adjustments, cash collateral, and variation margin for daily settled contracts 1 (41 ) (643 ) (13 ) (668 ) Total derivative assets and derivative liabilities $ 139 $ 23 $ 191 $ 76 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions, cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty, and includes fair value adjustments on derivatives for variation margin, which effective January 3, 2017, is characterized as a daily settled contract. Cash collateral posted by the Bank (including accrued interest) was $264 million and $658 million at June 30, 2017 and December 31, 2016. At June 30, 2017 the Bank did not receive cash collateral from clearing agents and/or counterparties. At December 31, 2016, the Bank received cash collateral from clearing agents and/or counterparties of $2 million . Variation margin for daily settled contracts was $339 million at June 30, 2017 . Variation margin was considered cash collateral prior to January 3, 2017. The following table summarizes the components of “Net gains (losses) on derivatives and hedging activities” as presented in the Statements of Income (dollars in millions): For the Three Months Ended For the Six Months Ended June 30, June 30, 2017 2016 2017 2016 Derivatives designated as hedging instruments (fair value hedges) Interest rate swaps $ 6 $ (8 ) $ 10 $ (9 ) Derivatives not designated as hedging instruments (economic hedges) Interest rate swaps (6 ) (18 ) (1 ) (55 ) Forward settlement agreements (TBAs) — (2 ) (1 ) (3 ) Mortgage delivery commitments — 2 1 3 Net interest settlements (3 ) (4 ) (7 ) (9 ) Total net gains (losses) related to derivatives not designated as hedging instruments (9 ) (22 ) (8 ) (64 ) Other 1 — — 1 — Net gains (losses) on derivatives and hedging activities $ (3 ) $ (30 ) $ 3 $ (73 ) 1 Consists of price alignment amount on derivatives for variation margin which is characterized as a daily settled contract. The following tables summarize, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair value hedging relationships, the net fair value hedge ineffectiveness, and the effect of those derivatives on the Bank's net interest income (dollars in millions): For the Three Months Ended June 30, 2017 Hedged Item Type Gains (Losses) on Derivatives Gains (Losses) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect on Net Interest Income 1 Available-for-sale investments $ (41 ) $ 49 $ 8 $ (24 ) Advances 2 (25 ) 26 1 (21 ) Consolidated obligation bonds 72 (75 ) (3 ) 7 Total $ 6 $ — $ 6 $ (38 ) For the Three Months Ended June 30, 2016 Hedged Item Type Gains (Losses) on Derivatives Gains (Losses) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect on Net Interest Income 1 Available-for-sale investments $ (128 ) $ 120 $ (8 ) $ (36 ) Advances 2 (42 ) 41 (1 ) (37 ) Consolidated obligation bonds 84 (83 ) 1 18 Total $ (86 ) $ 78 $ (8 ) $ (55 ) 1 Represents the net interest settlements on derivatives in fair value hedge relationships and the amortization of the financing element of off-market derivatives, both of which are included in the interest income or interest expense line item of the respective hedged item type. This amortization for off-market derivatives totaled $4 million and $8 million for the three months ended June 30, 2017 and 2016. 2 Includes net gains (losses) on fair value hedge firm commitments of forward starting advances. The following tables summarize, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair value hedging relationships, the net fair value hedge ineffectiveness, and the effect of those derivatives on the Bank's net interest income (dollars in millions): For the Six Months Ended June 30, 2017 Hedged Item Type Gains (Losses) on Derivatives Gains (Losses) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect on Net Interest Income 1 Available-for-sale investments $ (4 ) $ 18 $ 14 $ (53 ) Advances 2 8 (6 ) 2 (45 ) Consolidated obligation bonds 22 (28 ) (6 ) 26 Total $ 26 $ (16 ) $ 10 $ (72 ) For the Six Months Ended June 30, 2016 Hedged Item Type Gains (Losses) on Derivatives Gains (Losses) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect on Net Interest Income 1 Available-for-sale investments $ (404 ) $ 401 $ (3 ) $ (74 ) Advances 2 (178 ) 179 1 (77 ) Consolidated obligation bonds 152 (159 ) (7 ) 33 Total $ (430 ) $ 421 $ (9 ) $ (118 ) 1 Represents the net interest settlements on derivatives in fair value hedge relationships and the amortization of the financing element of off-market derivatives, both of which are included in the interest income or interest expense line item of the respective hedged item type. This amortization for off-market derivatives totaled $9 million and $16 million for the six months ended June 30, 2017 and 2016. 2 Includes net gains (losses) on fair value hedge firm commitments of forward starting advances. MANAGING CREDIT RISK ON DERIVATIVES The Bank is subject to credit risk due to the risk of nonperformance by counterparties to its derivative contracts. The Bank manages credit risk through credit analyses, collateral requirements, and adherence to the requirements set forth in the Bank's policies, U.S. Commodity Futures Trading Commission regulations, and Finance Agency regulations. For uncleared derivatives, the degree of credit risk depends on the extent to which master netting arrangements are included in these contracts to mitigate the risk. The Bank requires collateral agreements with collateral delivery thresholds on the majority of its uncleared derivatives. Certain of the Bank's uncleared derivative instruments contain provisions that require the Bank to post additional collateral with its counterparties if there is deterioration in the Bank's credit rating. If the Bank's credit rating is lowered by a nationally recognized statistical rating organization (NRSRO), the Bank may be required to deliver additional collateral on uncleared derivative instruments in net liability positions. The aggregate fair value of all uncleared derivative instruments with credit-risk related contingent features that were in a net liability position (before cash collateral and related accrued interest) at June 30, 2017 was $145 million , for which the Bank posted collateral of $133 million in the normal course of business. If the Bank's credit rating had been lowered from its current rating to the next lower rating that would have triggered additional collateral to be delivered, the Bank would have been required to deliver an additional $4 million of collateral to its uncleared derivative counterparties at June 30, 2017 . For cleared derivatives, the Clearinghouse is the Bank's counterparty. The Clearinghouse notifies the clearing agent of the required initial and variation margin and the clearing agent in turn notifies the Bank. The Bank utilizes one Clearinghouse for all cleared derivative transactions, CME Clearing. Effective January 3, 2017, CME Clearing made certain amendments to its rulebook changing the legal characteristics of variation margin payments to be daily settlement payments, rather than collateral. Initial margin is considered cash collateral. The requirement that the Bank post initial and variation margin through the clearing agent, to the Clearinghouse, exposes the Bank to institutional credit risk if the clearing agent or the Clearinghouse fails to meet its obligations. The use of cleared derivatives is intended to mitigate credit risk exposure because a central counterparty is substituted for individual counterparties and collateral/payments for changes in the fair value of cleared derivatives is posted daily through a clearing agent. The Bank has analyzed the enforceability of offsetting rights incorporated in its cleared derivative transactions and has determined that the exercise of those offsetting rights by a non-defaulting party under these transactions should be upheld under applicable law upon an event of default, including a bankruptcy, insolvency, or similar proceeding involving the Clearinghouse or the clearing agent, or both. 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. The Clearinghouse determines initial margin requirements and generally credit ratings are not factored into the initial margin. However, clearing agents may require additional initial margin to be posted based on credit considerations, including, but not limited to, credit rating downgrades. The Bank was not required to post additional initial margin by its clearing agents, based on credit considerations at June 30, 2017 . OFFSETTING OF DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES The Bank presents derivative instruments, related cash collateral, including initial margin pledged, and associated accrued interest on a net basis by clearing agent and/or by counterparty when it has met the netting requirements. Additional information regarding these agreements is provided in "Note 1 — Basis of Presentation" in this Form 10-Q and "Note 1 - Summary of Significant Accounting Policies" in the 2016 Form 10-K. The following table presents the fair value of derivative instruments meeting or not meeting the netting requirements, including the related collateral received from or pledged to counterparties and variation margin for daily settled contracts (dollars in millions): June 30, 2017 December 31, 2016 Derivative Assets Derivative Liabilities Derivative Assets Derivative Liabilities Derivative instruments meeting netting requirements Gross recognized amount Uncleared derivatives $ 79 $ 223 $ 97 $ 263 Cleared derivatives 101 443 107 481 Total gross recognized amount 180 666 204 744 Gross amounts of netting adjustments, cash collateral, and variation margin for daily settled contracts Uncleared derivatives (68 ) (200 ) (95 ) (187 ) Cleared derivatives 27 (443 ) 82 (481 ) Total gross amounts of netting adjustments, cash collateral, and variation margin for daily settled contracts (41 ) (643 ) (13 ) (668 ) Net amounts after netting adjustments, cash collateral, and variation margin for daily settled contracts Uncleared derivatives 11 23 2 76 Cleared derivatives 128 — 189 — Total derivative assets and derivative liabilities $ 139 $ 23 $ 191 $ 76

Consolidated Obligations

Consolidated Obligations	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Consolidated Obligations [Text Block]	Consolidated Obligations Consolidated obligations consist of bonds and discount notes. The FHLBanks issue consolidated obligations through the Office of Finance as their agent. Bonds are issued primarily to raise intermediate- and long-term funds for the Bank and are not subject to any statutory or regulatory limits on their maturity. Discount notes are issued primarily to raise short-term funds for the Bank and have original maturities of up to one year. Discount notes sell at or below their face amount and are redeemed at par value when they mature. Although the Bank is primarily liable for the portion of consolidated obligations issued on its behalf, it is also jointly and severally liable with the other FHLBanks for the payment of principal and interest on all FHLBank System consolidated obligations. The Finance Agency, at its discretion, may require any FHLBank to make principal and/or interest payments due on any consolidated obligation, whether or not the primary obligor FHLBank has defaulted on the payment of that consolidated obligation. The Finance Agency has never exercised this discretionary authority. At June 30, 2017 and December 31, 2016 , the total par value of outstanding consolidated obligations of the FHLBanks was $1 trillion and $989 billion . DISCOUNT NOTES The following table summarizes the Bank's discount notes (dollars in millions): June 30, 2017 December 31, 2016 Amount Weighted Average Interest Rate Amount Weighted Average Interest Rate Par value $ 66,668 0.91 % $ 81,019 0.49 % Discounts and concessions 1 (110 ) (72 ) Total $ 66,558 $ 80,947 1 Concessions represent fees paid to dealers in connections with the issuance of certain consolidated obligation discount notes. BONDS The following table summarizes the Bank's bonds outstanding by contractual maturity (dollars in millions): June 30, 2017 December 31, 2016 Year of Contractual Maturity Amount Weighted Average Interest Rate Amount Weighted Average Interest Rate Due in one year or less $ 48,266 1.05 % $ 47,733 0.88 % Due after one year through two years 17,427 1.28 13,135 0.94 Due after two years through three years 10,047 1.73 15,414 1.48 Due after three years through four years 2,015 2.71 2,288 3.28 Due after four years through five years 6,799 1.67 7,152 1.66 Thereafter 4,768 3.03 4,331 3.04 Total par value 89,322 1.36 % 90,053 1.22 % Premiums 224 254 Discounts and concessions 1 (69 ) (79 ) Fair value hedging adjustments (306 ) (330 ) Total $ 89,171 $ 89,898 1 Concessions represent fees paid to dealers in connections with the issuance of certain consolidated obligation bonds. The following table summarizes the Bank's bonds outstanding by call features (dollars in millions): June 30, December 31, Noncallable or nonputable $ 86,408 $ 87,804 Callable 2,914 2,249 Total par value $ 89,322 $ 90,053

Capital

Capital	6 Months Ended
	Jun. 30, 2017
Capital [Abstract]
Capital [Text Block]	Capital CAPITAL STOCK The Bank's capital stock has a par value of $100 per share, and all shares are issued, redeemed, and repurchased only at the stated par value. The Bank generally issues a single class of capital stock (Class B stock). The Bank has two subclasses of capital stock: membership and activity-based. Each member must purchase and hold membership capital stock in an amount equal to 0.12 percent of its total assets as of the preceding December 31 st , subject to a cap of $10 million and a floor of $10,000 . Each member is also required to purchase activity-based capital stock equal to 4.00 percent of its advances and mortgage loans outstanding in the Bank's Statements of Condition. All capital stock issued is subject to a five year notice of redemption period. The capital stock requirements established in the Bank's Capital Plan are designed so that the Bank can remain adequately capitalized as member activity changes. The Bank's Board of Directors may make adjustments to the capital stock requirements within ranges established in the Capital Plan. EXCESS STOCK Capital stock owned by members in excess of their investment requirement is deemed excess capital stock. Under its Capital Plan, the Bank, at its discretion and upon 15 days' written notice, may repurchase excess membership capital stock. The Bank, at its discretion, may also repurchase excess activity-based capital stock to the extent that (i) the excess capital stock balance exceeds an operational threshold set forth in the Capital Plan, which is currently set at zero, or (ii) a member submits a notice to redeem all or a portion of the excess activity-based capital stock. At June 30, 2017 and December 31, 2016 , the Bank had no excess capital stock outstanding. MANDATORILY REDEEMABLE CAPITAL STOCK The Bank reclassifies capital stock subject to redemption from equity to a liability (mandatorily redeemable capital stock) at the time shares meet the definition of a mandatorily redeemable financial instrument. This occurs after a member provides written notice of intention to withdraw from membership, becomes ineligible for continuing membership, or attains non-member status by merger or consolidation, charter termination, or other involuntary termination from membership. Dividends on mandatorily redeemable capital stock are classified as interest expense in the Statements of Income. As a result of the final rule on membership issued by the Finance Agency effective February 19, 2016, the eligibility requirements for FHLBank members were changed rendering captive insurance companies ineligible for FHLBank membership. On the effective date of the final rule, the Bank reclassified $723 million of capital stock, the total outstanding capital stock held by all of the Bank's captive insurance companies, to mandatorily redeemable capital stock. In accordance with the final rule, on February 17, 2017, the Bank terminated the membership of all captive insurance company members that were admitted as members after September 12, 2014 (the date the Finance Agency proposed this rule) and repurchased outstanding capital stock to these captive insurance company members in the amount of $148 million . Captive insurance company members that were admitted as members prior to September 12, 2014 will also have their memberships terminated no later than February 19, 2021. At June 30, 2017 and December 31, 2016 , the Bank's mandatorily redeemable capital stock totaled $480 million and $664 million . During the three and six months ended June 30, 2017 , interest expense on mandatorily redeemable capital stock was $4 million and $9 million . Interest expense on mandatorily redeemable capital stock was $5 million and $9 million for the three and six months ended June 30, 2016 . The following tables summarizes changes in mandatorily redeemable capital stock (dollars in millions): For the Three Months Ended June 30, 2017 2016 Balance, beginning of period $ 494 $ 732 Capital stock reclassified to (from) mandatorily redeemable capital stock, net 18 1 Repurchases/redemptions of mandatorily redeemable capital stock (32 ) (35 ) Balance, end of period $ 480 $ 698 For the Six Months Ended June 30, 2017 2016 Balance, beginning of period $ 664 $ 103 Capital stock reclassified to (from) mandatorily redeemable capital stock, net 28 731 Repurchases/redemptions of mandatorily redeemable capital stock (212 ) (136 ) Balance, end of period $ 480 $ 698 The following table summarizes the Bank's mandatorily redeemable capital stock by year of contractual redemption (dollars in millions): Year of Contractual Redemption 1 June 30, 2017 December 31, 2016 Due in one year or less $ 4 $ 4 Due after one year through two years — 5 Due after two years through three years 4 4 Due after three years through four years 1 — Due after four years through five years 21 1 Thereafter 2 433 631 Past contractual redemption date due to outstanding activity with the Bank 17 19 Total $ 480 $ 664 1 At the Bank's election, the mandatorily redeemable capital stock may be redeemed prior to the expiration of the five year redemption period that commences on the date of the notice of redemption, or in the case of captive insurance company members, on the date of the membership termination. 2 Represents mandatorily redeemable capital stock resulting from the Finance Agency rule previously discussed that makes captive insurance companies ineligible for FHLBank membership. The related mandatorily redeemable capital stock is not required to be redeemed until five years after the member's termination. ADDITIONAL CAPITAL FROM MERGER The Bank recognized the net assets acquired from the Seattle Bank by recording the par value of capital stock issued in the transaction as capital stock, with the remaining portion of net assets acquired reflected in a capital account captioned as “Additional capital from merger.” The Bank treated this additional capital from merger as a component of total capital for regulatory capital purposes. Dividends on capital stock were paid from this account following the Merger until the balance was depleted following the first quarter dividend payment in May 2017. At December 31, 2016 the Bank's additional capital from merger balance totaled $52 million . RESTRICTED RETAINED EARNINGS The Bank entered into a Joint Capital Enhancement Agreement (JCE Agreement) with all of the other FHLBanks in February 2011. The JCE Agreement, as amended, is intended to enhance the capital position of the Bank over time. It requires the Bank to allocate 20 percent of its quarterly net income to a separate restricted retained earnings account until the balance of that account equals at least one percent of its average balance of outstanding consolidated obligations for the previous quarter. The restricted retained earnings are not available to pay dividends. At June 30, 2017 and December 31, 2016 , the Bank's restricted retained earnings account totaled $285 million and $231 million . ACCUMULATED OTHER COMPREHENSIVE INCOME The following table summarizes changes in accumulated other comprehensive income (AOCI) (dollars in millions): Net unrealized gains (losses) on AFS securities (Note 4) Pension and postretirement benefits Total AOCI Balance, March 31, 2016 $ (119 ) $ (3 ) $ (122 ) Other comprehensive income (loss) before reclassifications Net unrealized gains (losses) on AFS securities 36 — 36 Reclassifications from other comprehensive income (loss) to net income Amortization - pension and postretirement — 1 1 Net current period other comprehensive income (loss) 36 1 37 Balance, June 30, 2016 $ (83 ) $ (2 ) $ (85 ) Balance, March 31, 2017 $ 50 $ (3 ) $ 47 Other comprehensive income (loss) before reclassifications Net unrealized gains (losses) on AFS securities 41 — 41 Reclassifications from other comprehensive income (loss) to net income Amortization - pension and postretirement — 1 1 Net current period other comprehensive income (loss) 41 1 42 Balance, June 30, 2017 $ 91 $ (2 ) $ 89 Balance, December 31, 2015 $ (82 ) $ (2 ) $ (84 ) Other comprehensive income (loss) before reclassifications Net unrealized gains (losses) on AFS securities (1 ) — (1 ) Net current period other comprehensive income (loss) (1 ) — (1 ) Balance, June 30, 2016 $ (83 ) $ (2 ) $ (85 ) Balance, December 31, 2016 $ (14 ) $ (4 ) $ (18 ) Other comprehensive income (loss) before reclassifications Net unrealized gains (losses) on AFS securities 105 — 105 Reclassifications from other comprehensive income (loss) to net income Amortization - pension and postretirement — 2 2 Net current period other comprehensive income (loss) 105 2 107 Balance, June 30, 2017 $ 91 $ (2 ) $ 89 REGULATORY CAPITAL REQUIREMENTS The Bank is subject to three regulatory capital requirements: • Risk-based capital . The Bank must maintain at all times permanent capital greater than or equal to the sum of its credit, market, and operations risk capital requirements, all calculated in accordance with Finance Agency regulations. Only permanent capital, defined as Class B stock (including mandatorily redeemable capital stock), and retained earnings can satisfy this risk-based capital requirement. • Regulatory capital . The Bank is required to maintain a minimum four percent capital-to-asset ratio, which is defined as total regulatory capital divided by total assets. Total regulatory capital includes Class B stock (including mandatorily redeemable capital stock) and retained earnings. It does not include AOCI. At December 31, 2016, regulatory capital also included additional capital from merger. The additional capital from merger balance was depleted in May of 2017 following the first quarter dividend payment. • Leverage capital . The Bank is required to maintain a minimum five percent leverage ratio, which is defined as the sum of permanent capital weighted 1.5 times and nonpermanent capital weighted 1.0 times, divided by total assets. The Bank did not hold any nonpermanent capital at June 30, 2017 . At December 31, 2016 , nonpermanent capital included additional capital from merger. If the Bank's capital falls below the required levels, the Finance Agency has authority to take actions necessary to return it to levels that it deems to be consistent with safe and sound business operations. The following table shows the Bank's compliance with the Finance Agency's regulatory capital requirements (dollars in millions): June 30, 2017 December 31, 2016 Required Actual Required Actual Regulatory capital requirements Risk-based capital $ 940 $ 7,787 $ 1,046 $ 8,031 Regulatory capital $ 6,600 $ 7,787 $ 7,224 $ 8,083 Leverage capital $ 8,249 $ 11,681 $ 9,030 $ 12,098 Capital-to-assets ratio 4.00 % 4.72 % 4.00 % 4.48 % Leverage ratio 5.00 % 7.08 % 5.00 % 6.70 %

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value [Text Block]	Fair Value Fair value amounts are determined by the Bank using available market information and reflect the Bank's best judgment of appropriate valuation methods. The fair value hierarchy requires an entity to maximize the use of significant observable inputs and minimize the use of significant unobservable inputs when measuring fair value. 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 prioritizes the inputs used to measure fair value into three broad levels: • Level 1 Inputs. Quoted prices (unadjusted) for identical assets or liabilities in an active market that the Bank can access on the measurement date. • Level 2 Inputs. 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: (i) quoted prices for similar assets or liabilities in active markets, (ii) quoted prices for identical or similar assets or liabilities in markets that are not active, (iii) 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, implied volatilities, and credit spreads), and (iv) market-corroborated inputs. • Level 3 Inputs. Unobservable inputs for the asset or liability. The Bank reviews its 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. These reclassifications are reported as transfers in/out as of the beginning of the quarter in which the changes occur. There were no such transfers during the six months ended June 30, 2017 and 2016 . The following table summarizes the carrying value, fair value, and fair value hierarchy of the Bank's financial instruments at June 30, 2017 (dollars in millions). The fair values do 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 assets and liabilities. Fair Value Financial Instruments Carrying Value Level 1 Level 2 Level 3 Netting Adjustment 1 Total Assets Cash and due from banks $ 964 $ 964 $ — $ — $ — $ 964 Interest-bearing deposits 2 — 2 — — 2 Securities purchased under agreements to resell 3,500 — 3,500 — — 3,500 Federal funds sold 5,100 — 5,100 — — 5,100 Trading securities 2,549 — 2,549 — — 2,549 Available-for-sale securities 22,403 — 22,403 — — 22,403 Held-to-maturity securities 4,209 — 4,251 14 — 4,265 Advances 118,878 — 119,119 — — 119,119 Mortgage loans held for portfolio, net 6,953 — 6,981 69 — 7,050 Accrued interest receivable 206 — 206 — — 206 Derivative assets, net 139 — 180 — (41 ) 139 Other assets 26 26 — — — 26 Liabilities Deposits (964 ) — (964 ) — — (964 ) Consolidated obligations Discount notes (66,558 ) — (66,550 ) — — (66,550 ) Bonds (89,171 ) — (89,636 ) — — (89,636 ) Total consolidated obligations (155,729 ) — (156,186 ) — — (156,186 ) Mandatorily redeemable capital stock (480 ) (480 ) — — — (480 ) Accrued interest payable (209 ) — (209 ) — — (209 ) Derivative liabilities, net (23 ) — (666 ) — 643 (23 ) 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. In addition, the amount includes the fair value adjustments on derivatives for variation margin which is characterized as a daily settled contract. The following table summarizes the carrying value, fair value, and fair value hierarchy of the Bank's financial instruments at December 31, 2016 (dollars in millions): Fair Value Financial Instruments Carrying Value Level 1 Level 2 Level 3 Netting Adjustment 1 Total Assets Cash and due from banks $ 223 $ 223 $ — $ — $ — $ 223 Interest-bearing deposits 2 — 2 — — 2 Securities purchased under agreements to resell 5,925 — 5,925 — — 5,925 Federal funds sold 5,095 — 5,095 — — 5,095 Trading securities 2,553 — 2,553 — — 2,553 Available-for-sale securities 22,969 — 22,969 — — 22,969 Held-to-maturity securities 4,674 — 4,691 15 — 4,706 Advances 131,601 — 131,772 — — 131,772 Mortgage loans held for portfolio, net 6,913 — 6,918 71 — 6,989 Loans to other FHLBanks 200 — 200 — — 200 Accrued interest receivable 197 — 197 — — 197 Derivative assets, net 191 — 204 — (13 ) 191 Other assets 24 24 — — — 24 Liabilities Deposits (1,113 ) — (1,113 ) — — (1,113 ) Consolidated obligations Discount notes (80,947 ) — (80,943 ) — — (80,943 ) Bonds (89,898 ) — (90,370 ) — — (90,370 ) Total consolidated obligations (170,845 ) — (171,313 ) — — (171,313 ) Mandatorily redeemable capital stock (664 ) (664 ) — — — (664 ) Accrued interest payable (180 ) — (180 ) — — (180 ) Derivative liabilities, net (76 ) — (744 ) — 668 (76 ) 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. SUMMARY OF VALUATION TECHNIQUES AND PRIMARY INPUTS Cash and Due from Banks. The fair value equals the carrying value. Interest-Bearing Deposits. For interest-bearing deposits with less than three months to maturity, the fair value approximates the carrying value. For interest-bearing deposits with more than three months to maturity, the fair value is determined by calculating the present value of the expected future cash flows and reducing the amount for accrued interest receivable. Securities Purchased under Agreements to Resell. For overnight and term securities purchased under agreements to resell with less than three months to maturity, the fair value approximates the carrying value. For term securities purchased under agreements to resell with more than three months to maturity, the fair value is determined by calculating the present value of the expected future cash flows and reducing the amount for accrued interest receivable. The discount rates used in these calculations are the rates for securities with similar terms. Federal Funds Sold. The fair value approximates the carrying value. Investment Securities. The Bank's valuation technique incorporates prices from multiple designated third-party pricing vendors, when available. The pricing vendors generally use various proprietary models to price investment securities. The inputs to those models are derived from various sources including, but not limited to, benchmark securities and yields, reported trades, dealer estimates, issuer spreads, bids, offers, and other market-related data. Since many investment securities do not trade on a daily basis, the pricing vendors use available information, as applicable, such as benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing to determine the prices for individual securities. Each pricing vendor has an established process in place to challenge investment valuations, which facilitates resolution of questionable prices identified by the Bank. Annually, the Bank conducts reviews of its pricing vendors to confirm and further augment its understanding of the vendors' pricing processes, methodologies, and control procedures for investment securities. The Bank's valuation technique for estimating the fair values of its investment securities first requires the establishment of a median price for each security. All prices that are within a specified tolerance threshold of the median price are included in the cluster of prices that are averaged to compute a default price. All prices that are outside the threshold (outliers) are subject to further analysis (including, but not limited to, comparison to prices provided by an additional third-party valuation service, prices for similar securities, and/or non-binding dealer estimates) to determine if an outlier is a better estimate of fair value. If an outlier (or some other price identified in the analysis) is determined to be a better estimate of fair value, then the outlier (or the other price as appropriate) is used as the final price rather than the default price. Alternatively, if the analysis confirms that an outlier (or outliers) is (are) in fact not representative of fair value and the default price is the best estimate, then the default price is used as the final price. In all cases, the final price is used to determine the fair value of the security. In limited instances, when no prices are available from one of the designated pricing services, the Bank obtains prices from dealers. As of June 30, 2017 and December 31, 2016 , multiple prices were received for the majority of the Bank's investment securities. Based on the Bank's review of the pricing methods and controls employed by the third-party pricing vendors and the relative lack of dispersion among the vendor prices, the Bank believes its final prices are representative of the prices that would have been received if the assets had been sold at the measurement date (i.e., exit prices) and further, that the fair value measurements are classified appropriately in the fair value hierarchy. Advances. The fair value of advances is determined by calculating the present value of the expected future cash flows and reducing the amount for accrued interest receivable. The discount rates used in these calculations are equivalent to the replacement advance rates for advances with similar terms. In accordance with Finance Agency regulations, advances generally require a prepayment fee sufficient to make the Bank financially indifferent to a borrower's decision to prepay the advances. Therefore, the fair value of advances assumes no prepayment risk. The Bank uses the following inputs for measuring the fair value of advances: • Consolidated Obligation Curve (CO Curve) . The Office of Finance constructs a market-observable curve referred to as the CO Curve. The CO Curve is constructed using the U.S. Treasury Curve as a base curve which is then adjusted by adding indicative spreads obtained largely from market-observable sources. These market indications are generally derived from pricing indications from dealers, historical pricing relationships, recent GSE trades, and secondary market activity. The Bank utilizes the CO Curve as its input to fair value for advances because it represents the Bank's cost of funds and is used to price advances. • Volatility assumption . Market-based expectations of future interest rate volatility implied from current market prices for similar options. • Spread assumption . Represents a spread adjustment to the CO Curve. Mortgage Loans Held for Portfolio. The fair value of mortgage loans held for portfolio is estimated based on quoted market prices of similar mortgage loans available in the market, if available, or modeled prices. The modeled prices start with prices for new MBS issued by GSEs or similar new mortgage loans. The prices are adjusted for factors such as credit risk, servicing spreads, seasoning, delinquency status, and cash flow remittances. The prices for new MBS or similar new mortgage loans are highly dependent upon the underlying prepayment assumptions priced in the secondary market. Changes in expected prepayment rates often have a material effect on the fair value estimates. Impaired Mortgage Loans Held for Portfolio. The fair value of impaired mortgage loans held for portfolio is estimated by obtaining property values from an external pricing vendor. This vendor utilizes multiple pricing models that generally factor in market observable inputs, including actual sales transactions and home price indices. The Bank applies an adjustment to these values to capture certain limitations in the estimation process and takes into consideration estimated selling costs and expected PMI proceeds. In limited instances, the Bank may estimate the fair value of an impaired mortgage loan by calculating the present value of expected future cash flows discounted at the loan's effective interest rate. Loans to other FHLBanks. The Bank may lend or borrow unsecured overnight funds to or from other FHLBanks. All such transactions are at current market rates. The fair value approximates the carrying value. Accrued Interest Receivable and Payable . The fair value approximates the carrying value. Derivative Assets and Liabilities. The fair value of derivatives is generally estimated using standard valuation techniques such as discounted cash flow analyses and comparisons to similar instruments, and also effective January 3, 2017, includes variation margin payments for daily settled contracts. In limited instances, fair value estimates for interest-rate related derivatives may be obtained using an external pricing model that utilizes observable market data. The Bank is subject to credit risk in derivatives transactions due to the potential nonperformance of its derivatives counterparties. The use of cleared derivatives is intended to mitigate credit risk exposure because a central counterparty is substituted for individual counterparties and collateral/payments is posted daily, through a clearing agent, for changes in the fair value of cleared derivatives. To mitigate credit risk on uncleared derivatives, the Bank enters into master netting agreements with its counterparties as well as collateral agreements that provide for the delivery of collateral at specified levels tied to those counterparties' credit ratings. The Bank has evaluated the potential for the fair value of its derivatives to be affected by counterparty credit risk and its own credit risk and has determined that no adjustments were significant to the overall fair value measurements. The fair values of the Bank's derivative assets and derivative liabilities include accrued interest receivable/payable and cash collateral remitted to/received from counterparties. The estimated fair values of the accrued interest receivable/payable and cash collateral approximate their carrying values due to their short-term nature. The fair values of derivatives are netted by clearing agent and/or counterparty if the netting requirements are met. If these netted amounts are positive, they are classified as an asset and, if negative, they are classified as a liability. The Bank's discounted cash flow model utilizes market-observable inputs (inputs that are actively quoted and can be validated to external sources). The Bank uses the following inputs for measuring the fair value of interest-related derivatives: • Discount rate assumption . The Bank utilizes the Overnight-Index Swap (OIS) curve. • Forward interest rate assumption . The Bank utilizes the London Interbank Offered Rate (LIBOR) swap curve. • Volatility assumption . Market-based expectations of future interest rate volatility implied from current market prices for similar options. For forward settlement agreements (TBAs), the Bank utilizes TBA securities prices that are determined by coupon class and expected term until settlement. For mortgage delivery commitments, the Bank utilizes TBA securities prices adjusted for factors such as credit risk and servicing spreads. Other Assets . These represent grantor trust assets, which are carried at estimated fair value based on quoted market prices as of the last business day of the reporting period. Deposits. For deposits with three months or less to maturity, the fair value approximates the carrying value. For deposits with more than three months to maturity, the fair value is determined by calculating the present value of the expected future cash flows and reducing the amount for accrued interest payable. The discount rates used in these calculations are the cost of deposits with similar terms. Consolidated Obligations. The fair value of consolidated obligations is determined by calculating the present value of the expected future cash flows and reducing the amount for accrued interest payable. The discount rates used in these calculations are for consolidated obligations with similar terms. The Bank uses the CO Curve and a volatility assumption for measuring the fair value of these consolidated obligations. Mandatorily Redeemable Capital Stock. The fair value of capital stock subject to mandatory redemption is generally reported at par value. Fair value also includes an estimated dividend earned at the time of reclassification from equity to a liability (if applicable), until such amount is paid. Capital stock can only be acquired by members at par value and redeemed at par value. Capital stock is not publicly traded and no market mechanism exists for the exchange of stock outside the cooperative structure. Subjectivity of Estimates . Estimates of the fair value of financial assets and liabilities using the methods previously described are highly subjective and require judgments regarding significant matters, such as the amount and timing of future cash flows, prepayment speed assumptions, expected interest rate volatility, possible distributions of future interest rates used to value options, and the selection of discount rates that appropriately reflect market and credit risks. The use of different assumptions could have a material effect on the fair value estimates. FAIR VALUE ON A RECURRING BASIS The following table summarizes, for each hierarchy level, the Bank's assets and liabilities that are measured at fair value in the Statements of Condition a t June 30, 2017 (dollar s in millions): Recurring Fair Value Measurements Level 1 Level 2 Level 3 Netting Adjustment 1 Total Assets Trading securities Other U.S. obligations $ — $ 207 $ — $ — $ 207 GSE and Tennessee Valley Authority obligations — 1,612 — — 1,612 Other non-MBS — 275 — — 275 GSE multifamily MBS — 455 — — 455 Total trading securities — 2,549 — — 2,549 Available-for-sale securities Other U.S. obligations — 3,323 — — 3,323 GSE and Tennessee Valley Authority obligations — 1,304 — — 1,304 State or local housing agency obligations — 988 — — 988 Other non-MBS — 281 — — 281 Other U.S. obligations single-family MBS — 3,946 — — 3,946 GSE single-family MBS — 1,125 — — 1,125 GSE multifamily MBS — 11,436 — — 11,436 Total available-for-sale securities — 22,403 — — 22,403 Derivative assets, net Interest-rate related — 180 — (41 ) 139 Other assets 26 — — — 26 Total recurring assets at fair value $ 26 $ 25,132 $ — $ (41 ) $ 25,117 Liabilities Derivative liabilities, net Interest-rate related — (666 ) — 643 (23 ) Total recurring liabilities at fair value $ — $ (666 ) $ — $ 643 $ (23 ) 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. In addition, the amount includes the fair value adjustments on derivatives for variation margin which is characterized as a daily settled contract. The following table summarizes, for each hierarchy level, the Bank's assets and liabilities that are measured at fair value in the Statements of Condition at December 31, 2016 (dollars in millions): Recurring Fair Value Measurements Level 1 Level 2 Level 3 Netting Adjustment 1 Total Assets Trading securities Other U.S. obligations $ — $ 216 $ — $ — $ 216 GSE and Tennessee Valley Authority obligations — 1,611 — — 1,611 Other non-MBS — 273 — — 273 GSE multifamily MBS — 453 — — 453 Total trading securities — 2,553 — — 2,553 Available-for-sale securities Other U.S. obligations — 3,529 — — 3,529 GSE and Tennessee Valley Authority obligations — 1,351 — — 1,351 State or local housing agency obligations — 1,009 — — 1,009 Other non-MBS — 278 — — 278 Other U.S. obligations single-family MBS — 3,838 — — 3,838 GSE single-family MBS — 1,261 — — 1,261 GSE multifamily MBS — 11,703 — — 11,703 Total available-for-sale securities — 22,969 — — 22,969 Derivative assets, net Interest-rate related — 204 — (13 ) 191 Other assets 24 — — — 24 Total recurring assets at fair value $ 24 $ 25,726 $ — $ (13 ) $ 25,737 Liabilities Derivative liabilities, net Interest-rate related — (744 ) — 668 (76 ) Total recurring liabilities at fair value $ — $ (744 ) $ — $ 668 $ (76 ) 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. FAIR VALUE ON A NON-RECURRING BASIS The Bank measures certain impaired mortgage loans held for portfolio at level 3 fair value on a non-recurring basis. These assets are subject to fair value adjustments in certain circumstances. The Bank estimates the fair value of these assets based primarily on a broker price opinion or property values from an external pricing vendor. The Bank applies an adjustment to these values to capture certain limitations in the estimation process and takes into consideration estimated selling costs and expected PMI proceeds. At June 30, 2017 and December 31, 2016 , impaired mortgage loans held for portfolio recorded at fair value as a result of a non-recurring change in fair value were $6 million and $15 million . These fair values were as of the date the fair value adjustment was recorded during the six months ended June 30, 2017 and year-ended December 31, 2016 .

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies [Text Block]	Commitments and Contingencies Joint and Several Liability . The FHLBanks have joint and several liability for all consolidated obligations issued. Accordingly, if an FHLBank were unable to repay any consolidated obligation for which it is the primary obligor, each of the other FHLBanks could be called upon by the Finance Agency to repay all or part of such obligations. No FHLBank has ever been asked or required to repay the principal or interest on any consolidated obligation on behalf of another FHLBank. A t June 30, 2017 and December 31, 2016 , the total par value of outstanding consolidated obligations issued on behalf of other FHLBanks for which the Bank is jointly and severally liable was approximately $855.5 billion and $818.2 billion . The following table summarizes additional off-balance sheet commitments for the Bank (dollars in millions): June 30, 2017 December 31, 2016 Expire within one year Expire after one year Total Total Standby letters of credit $ 7,487 $ 156 $ 7,643 $ 7,281 Standby bond purchase agreements 124 575 699 458 Commitments to purchase mortgage loans 113 — 113 102 Commitments to issue bonds 360 — 360 — Commitments to issue discount notes 15 — 15 — Commitments to fund advances 1,032 28 1,060 280 Standby Letters of Credit . A standby letter of credit is a financing arrangement between the Bank and a member. Standby letters of credit are executed with members for a fee. If the Bank is required to make payment for a beneficiary's draw, the payment is withdrawn from the member's demand account. Any resulting overdraft is converted into a collateralized advance to the member. The original terms of standby letters of credit range from less than one month to 13 years, currently no later than 2025 . Unearned fees for standby letters of credit are recorded in “Other liabilities” in the Statements of Condition and amounted to $4 million at June 30, 2017 and $3 million at December 31, 2016 . The Bank monitors the creditworthiness of its standby letters of credit based on an evaluation of its borrowers. The Bank has established parameters for the measurement, review, classification, and monitoring of credit risk related to these standby letters of credit. Based on management's credit analyses and collateral requirements, the Bank does not deem it necessary to have any provision for credit losses on these standby letters of credit. All standby letters of credit are fully collateralized at the time of issuance. Standby Bond Purchase Agreements . The Bank has entered into standby bond purchase agreements with state housing associates within its district whereby, for a fee, it agrees to serve as a standby liquidity provider if required, to purchase and hold the housing associate's bonds until the designated marketing agent can find a suitable investor or the housing associate repurchases the bonds according to a schedule established by the agreement. Each standby bond purchase agreement includes the provisions under which the Bank would be required to purchase the bonds. At June 30, 2017 , the Bank had standby bond purchase agreements with seven housing associates. The standby bond purchase commitments entered into by the Bank have original expiration periods of up to seven years, currently no later than 2024 . During both the six months ended June 30, 2017 and 2016 , the Bank was not required to purchase any bonds under these agreements. For both the three months ended June 30, 2017 and 2016, the Bank received fees for the guarantees that amounted to less than $1 million. For both the six months ended June 30, 2017 and 2016 , the Bank received fees for the guarantees that amounted to $1 million. Commitments to Purchase Mortgage Loans . The Bank enters into commitments that unconditionally obligate it to purchase mortgage loans from its members. Commitments are generally for periods not to exceed 45 days. These commitments are considered derivatives and their estimated fair value at June 30, 2017 and December 31, 2016 is reported in “Note 10 — Derivatives and Hedging Activities” as mortgage delivery commitments. Commitments to Issue Bonds . At June 30, 2017 , the Bank had commitments to issue $360 million of consolidated obligation bonds. At December 31, 2016 , the Bank had no commitments to issue consolidated obligations bonds. Commitments to Issue Discount Notes. At June 30, 2017 , the Bank had commitments to issue $15 million of consolidated obligation discount notes. At December 31, 2016 , the Bank had no commitments to issue consolidated obligation discount notes. Commitments to Fund Advances. The Bank enters into commitments that legally bind it to fund additional advances up to 24 months in the future. At June 30, 2017 and December 31, 2016 , the Bank had commitments to fund advances of $1.1 billion and $280 million . Other Commitments. For each master commitment, the Bank's potential loss exposure prior to the PFI's credit enhancement obligation is estimated and tracked in a memorandum account called the FLA. For absorbing certain losses in excess of the FLA, PFIs are paid a credit enhancement fee, a portion of which may be performance-based. To the extent the Bank experiences losses under the FLA, it may be able to recapture performance-based credit enhancement fees paid to the PFI to offset these losses. The FLA balance for all MPF master commitments with a PFI credit enhancement obligation was $103 million and $99 million at June 30, 2017 and December 31, 2016 . For additional information related to the FLA commitment, refer to "Note 9 — Allowance for Credit Losses." Legal Proceedings . As a result of the Merger, the Bank has been involved in a number of legal proceedings initiated by the Seattle Bank against various entities relating to its purchases and subsequent impairment of certain private-label MBS. Although the Seattle Bank sold all private-label MBS during the first quarter of 2015 and all of the lawsuits have been either settled or dismissed, the Bank has appealed certain claims dismissed by the court against three defendants. Other than the private-label MBS litigation, the Bank does not believe any legal proceedings to which it is a party could have a material impact on its financial condition, results of operations, or cash flows. Litigation settlement gains 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. In addition, litigation settlement gains are considered realizable and recorded 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 litigation settlement gains to be gain contingencies, and therefore they are not recorded in the Statements of Income. The Bank records legal expenses related to litigation settlements as incurred in other expenses in the Statements of Income with the exception of certain legal expenses related to litigation settlement awards that are contingent based fees for the attorneys representing the Bank. The Bank incurs and recognizes these contingent based legal fees only when litigation settlement awards are realized, at which time these fees are netted against the gains recognized on the litigation settlement. During the three months ended June 30, 2017, the Bank did not recognize net gains on litigation settlements. During the six months ended June 30, 2017, the Bank recognized $21 million in net gains on litigation settlements through other income (loss), due to the settlement of one of the Bank's private-label MBS claims. During the three and six months ended June 30, 2016 , the Bank recognized $200 million and $337 million in net gains on litigation settlements.

Activities with Stockholders

Activities with Stockholders	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Activities with Stockholders [Text Block]	Activities with Stockholders The Bank is a cooperative. This means the Bank is owned by its customers, whom the Bank calls members. As a condition of membership in the Bank, all members must purchase and maintain membership capital stock based on a percentage of their total assets, subject to a minimum and maximum amount, as of the preceding December 31 st . Each member is also required to purchase and maintain activity-based capital stock to support certain business activities with the Bank. TRANSACTIONS WITH DIRECTORS' FINANCIAL INSTITUTIONS In the normal course of business, the Bank extends credit to its members whose directors and officers serve as Bank directors (Directors' Financial Institutions). Finance Agency regulations require that transactions with Directors' Financial Institutions be made on the same terms and conditions as those with any other member. The following table summarizes the Bank's outstanding transactions with Directors' Financial Institutions (dollars in millions): June 30, 2017 December 31, 2016 Amount % of Total Amount % of Total Advances $ 5,386 5 $ 2,497 2 Mortgage loans 57 1 186 3 Deposits 23 2 82 7 Capital stock 270 4 157 2 BUSINESS CONCENTRATIONS The Bank considers itself to have business concentrations with stockholders owning 10 percent or more of its total capital stock outstanding (including mandatorily redeemable capital stock). At June 30, 2017 , the Bank had the following business concentrations with stockholders (dollars in millions): Capital Stock Mortgage Interest Stockholder Amount % of Total 1 Advances Loans Income 2 Wells Fargo Bank, N.A. $ 2,510 41 $ 62,500 $ — $ 390 Superior Guaranty Insurance Company 3 25 — — 596 — Wells Fargo Bank Northwest, N.A. 3 1 — — 33 — Total $ 2,536 41 $ 62,500 $ 629 $ 390 1 Pursuant to applicable Finance Agency regulations, the Bank's voting structure limits the voting rights of these stockholders and other members holding a significant amount of the Bank's capital stock. 2 Represents interest income earned on advances during the six months ended June 30, 2017 . Interest income on mortgage loans is excluded from this table as this interest relates to the borrower, not to the stockholder. 3 Superior Guaranty Insurance Company and Wells Fargo Bank Northwest, N.A. are affiliates of Wells Fargo Bank, N.A. At December 31, 2016 , the Bank had the following business concentrations with stockholders (dollars in millions): Capital Stock Mortgage Interest Stockholder Amount % of Total 1 Advances Loans Income 2 Wells Fargo Bank, N.A. $ 3,093 47 $ 77,075 $ — $ 429 Superior Guaranty Insurance Company 3 28 1 — 683 — Wells Fargo Bank Northwest N.A. 3 2 — — 38 — Total $ 3,123 48 $ 77,075 $ 721 $ 429 1 Pursuant to applicable Finance Agency regulations, the Bank's voting structure limits the voting rights of these stockholders and other members holding a significant amount of the Bank's capital stock. 2 Represents interest income earned on advances during the year ended December 31, 2016 . Interest income on mortgage loans is excluded from this table as this interest relates to the borrower, not to the stockholder. 3 Superior Guaranty Insurance Company and Wells Fargo Bank Northwest, N.A. are affiliates of Wells Fargo Bank, N.A.

Activities with Other FHLBanks

Activities with Other FHLBanks	6 Months Ended
	Jun. 30, 2017
Activities with Other FHLBanks [Abstract]
Activities with Other FHLBanks [Text Block]	Activities with Other FHLBanks Overnight Funds . The Bank may lend or borrow unsecured overnight funds to or from other FHLBanks. All such transactions are at current market rates. During the six months ended June 30, 2016 , the Bank did not lend funds to other FHLBanks. The following table summarizes loan activity to other FHLBanks during the six months ended June 30, 2017 (dollars in millions): Other FHLBank Beginning Balance Loans Principal Repayment Ending Balance 2017 San Francisco $ 200 $ — $ (200 ) $ — During the six months ended June 30, 2017 , the Bank did not borrow funds from other FHLBanks. The following table summarizes borrowing activity from other FHLBanks during the six months ended June 30, 2016 (dollars in millions): Other FHLBank Beginning Balance Borrowing Principal Payment Ending Balance 2016 San Francisco $ — $ 200 $ (200 ) $ — At June 30, 2017 and 2016 , none of the previous transactions were outstanding on the Bank's Statements of Condition. The interest income and expense related to this activity were immaterial. Advance Transfers. The Bank may purchase or sell advances from/to other FHLBanks. These transfers are accounted for in the same manner as an advances origination with a member bank. During the six months ended June 30, 2017 , a member of the Federal Home Loan Bank of Chicago (Chicago Bank) re-designated its charter, and concurrently transferred its Federal Home Loan Bank membership from the Chicago Bank to the Des Moines Bank. In conjunction with this transfer and at request of the member, the Bank purchased $37 million of par value advances outstanding to this member from the Chicago Bank and recognized related premiums of $1 million . There were no advance transfers during the six months ended June 30, 2016 .

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events Subsequent events have been evaluated from July 1, 2017, through the time of the Form 10-Q filing with the Securities and Exchange Commission. No material subsequent events requiring disclosure were identified.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	The accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted and Issued Accounting Guidance ADOPTED ACCOUNTING GUIDANCE Contingent Put and Call Options in Debt Instruments On March 14, 2016, the Financial Accounting Standards Board (FASB) issued amendments to clarify the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. The guidance requires entities to apply only the four-step decision sequence when assessing whether the economic characteristics and risks of call (put) options are clearly and closely related to the economic characteristics and risks of their debt hosts. Consequently, when a call (put) option is contingently exercisable, an entity does not have to assess whether the event that triggers the ability to exercise a call (put) option is related to interest rates or credit risks. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2017. The adoption of this guidance did not have an effect on the Bank's financial conditions, results of operations, or cash flows. ISSUED ACCOUNTING GUIDANCE Premium Amortization on Purchased Callable Debt Securities On March 30, 2017, FASB issued guidance for the amortization period for certain purchased callable debt securities held at a premium. Specifically, this guidance requires the premium to be amortized to the earliest call date. This guidance does not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. This guidance affects all entities that hold investments in callable debt securities that have an amortized cost basis in excess of the amount that is repayable by the issuer at the earliest call date (that is, at a premium). This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2019, and early adoption is permitted. This guidance should be applied using a modified retrospective method through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Bank is in the process of evaluating this guidance, but its effect on the Bank's financial condition, results of operations, and cash flows has not yet been determined. Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost On March 10, 2017, the FASB issued the guidance to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. This guidance requires entities to disaggregate the service cost component from the other components of net benefit cost. The guidance also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2018, and early adoption is permitted. This guidance should be applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic postretirement benefit cost in the income statement and prospectively, on and after the effective date, for the capitalization of the service cost component of net periodic pension cost and net periodic postretirement benefit in assets. The Bank is in the process of evaluating this guidance, but its effect on the Banks’ financial condition, results of operations, and cash flows has not yet been determined. Classification of Certain Cash Receipts and Cash Payments On August 26, 2016, the FASB issued amendments to clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. This guidance is intended to reduce existing diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2018, and early adoption is permitted. This guidance should be applied using a retrospective transition method to each period presented. The Bank does not intend to adopt this guidance early. The adoption of this guidance will have no effect on the Bank's financial condition, results of operations, or cash flows. Measurement of Credit Losses on Financial Instruments On June 16, 2016, the FASB issued amended guidance for the accounting of credit losses on financial instruments. The amendments require entities to measure expected credit losses based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The new guidance requires a financial asset, or a group of financial assets, measured at amortized cost to be presented at the net amount expected to be collected. The guidance also requires, among other things, the following: • The statement of income to reflect the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. • Entities to determine the allowance for credit losses for purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (PCD assets) that are measured at amortized cost in a similar manner to other financial assets measured at amortized cost. The initial allowance for credit losses is required to be added to the purchase price of the assets acquired. • Entities to record credit losses relating to available-for-sale (AFS) debt securities through an allowance for credit losses. The amendments limit the allowance for credit losses to the amount by which fair value is below amortized cost. • Public entities to further disaggregate the current disclosure of credit quality indicators in relation to the amortized cost of financing receivables by the year of origination (i.e., vintage). This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2020. Early application is permitted as of the interim and annual reporting periods beginning after December 15, 2018. This guidance should be applied using a modified-retrospective approach, through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. In addition, entities are required to use a prospective transition approach for PCD assets upon adoption and for debt securities for which an other-than-temporary impairment had been recognized before the effective date. The Bank does not intend to adopt the new guidance early. While the Bank is in the process of evaluating this guidance, the Bank expects the adoption of the guidance may result in an increase in the allowance for credit losses, including an allowance for debt securities, given the requirement to assess losses for the entire estimated life of the financial asset. The effect on the Bank's financial condition, results of operations, and cash flows will depend upon the composition of financial assets held by the Bank at the adoption date as well as the economic conditions and forecasts at that time. Leases On February 25, 2016, the FASB issued guidance which requires recognition of lease assets and lease liabilities on the statement of condition and disclosure of key information about leasing arrangements. Specifically, this guidance requires a lessee, of operating or finance leases, to recognize on the statement of condition a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities. Under previous GAAP, a lessee was not required to recognize lease assets and lease liabilities arising from operating leases on the statement of condition. While this guidance does not fundamentally change lessor accounting, some changes have been made to align that guidance with the lessee guidance and other areas within GAAP. This guidance becomes effective for the Bank for the interim and annual periods beginning on January 1, 2019, and early application is permitted. This guidance requires lessors and lessees to recognize and measure leases at the beginning of the earliest period presented in the financial statements using a modified retrospective approach. The Bank does not intend to adopt this new guidance early. Upon adoption, the Bank expects to report higher assets and liabilities as a result of recording right-of-use assets and lease liabilities on its statements of condition. The Bank is in the process of evaluating this guidance, but its effect on the Bank's financial condition, results of operations, or cash flows has not yet been determined. Recognition and Measurement of Financial Assets and Financial Liabilities On January 5, 2016, the FASB issued amended guidance on certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. This guidance includes, but is not limited to, the following: • Requires an entity to present separately in other comprehensive income (OCI) the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. • Requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the statements of condition or the accompanying notes to the financial statements. • Eliminates the requirement for public entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the statements of condition. This guidance becomes effective for the Bank for the interim and annual periods beginning on January 1, 2018, and early adoption is only permitted for certain provisions. The amendments, in general, should be applied by means of a cumulative-effect adjustment to the statements of condition as of the beginning of the period of adoption. While this guidance will affect the Bank's disclosures, the Bank does not expect the requirement to present the instrument-specific credit risk in OCI to have a material effect on the Bank's financial condition, results of operations, or cash flows. Revenue from Contracts with Customers On May 28, 2014, the FASB issued guidance on revenue from contracts with customers. This guidance outlines a single comprehensive model for recognizing revenue arising from contracts with customers and supersedes most current revenue recognition guidance. In addition, this guidance amends the existing requirements for the recognition of a gain or loss on the transfer of non-financial assets that are not in a contract with a customer. This guidance applies to all contracts with customers except those that are within the scope of certain other standards, such as financial instruments, certain guarantees, insurance contracts, and lease contracts. The guidance provides entities with the option of using either of the following adoption methods: a full retrospective method, retrospectively to each prior reporting period presented; or a modified retrospective method, retrospectively with the cumulative effect of initially applying this guidance recognized at the date of initial application. On August 12, 2015, the FASB issued an amendment to defer the effective date of this guidance issued in May 2014 by one year. In 2016, the FASB has issued additional amendments to clarify certain aspects of the new revenue guidance. However, these amendments do not change the core principle in the new revenue standard. This guidance is effective for the Bank for interim and annual periods beginning on January 1, 2018. Early application is permitted only as of the interim and annual reporting periods beginning after December 15, 2016. The Bank does not intend to adopt this new guidance early. Given that the majority of the Bank's financial instruments and other contractual rights that generate revenue are covered by other U.S. GAAP, the effect of this guidance on the Bank's financial condition, results of operations, and cash flows is not expected to be material.
Other Than Temporary Impairment, Policy [Policy Text Block]	The Bank evaluates its individual AFS and HTM securities in an unrealized loss position for other-than-temporary impairment (OTTI) on a quarterly basis. As part of its evaluation of securities for OTTI, the Bank considers its intent to sell each debt security and whether it is more likely than not that it will be required to sell the security before its anticipated recovery. If either of these conditions is met, the Bank will recognize an OTTI charge to earnings equal to the entire difference between the security's amortized cost basis and its fair value at the reporting date. For securities in an unrealized loss position that meet neither of these conditions, the Bank performs analyses to determine if any of these securities are other-than-temporarily impaired.
Advance Prepayment Fees, Policy [Policy Text Block]	The Bank generally charges a prepayment fee for advances that a borrower elects to terminate prior to the stated maturity or outside of a predetermined call or put date. The fees charged are priced to make the Bank financially indifferent to the prepayment of the advance. For certain advances with symmetrical prepayment features, 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. Prepayment fees and credits are recorded net of fair value hedging adjustments in the Statements of Income.
Loan and leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	The Bank utilizes an allowance for credit losses to reserve for estimated losses in its conventional MPF and MPP mortgage loan portfolios at the balance sheet date. The measurement of the Bank's MPF and MPP allowance for credit losses is determined by the following: • reviewing similar conventional mortgage loans for impairment on a collective basis. This evaluation is primarily based on the following factors: (i) current loan delinquencies, (ii) loans migrating to collateral-dependent status, and (iii) actual historical loss severities; • reviewing conventional mortgage loans for impairment on an individual basis; and • estimating additional credit losses in the conventional mortgage loan portfolio. These losses result from other factors that may not be captured in the methodology previously described at the balance sheet date, which include but are not limited to certain quantifiable economic factors, such as unemployment rates and home prices impacting housing markets.
Impairment Financing Receivable, Policy [Policy Text Block]	A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect all amounts due according to the contractual terms of the loan agreement.
Derivatives, Policy [Policy Text Block]	Derivatives. All derivatives are recognized on the Statements of Condition at their fair values and reported as either derivative assets or derivative liabilities, net of cash collateral, including initial margin, and accrued interest received from or pledged to clearing agents and/or counterparties. The fair values of derivatives are netted by clearing agent and/or counterparty when the netting requirements have been met. If these netted amounts are positive, they are classified as a derivative asset and, if negative, they are classified as a derivative liability. Cash flows associated with derivatives are reflected as cash flows from operating activities in the Statements of Cash Flows unless the derivative meets the criteria to be a financing derivative. The Bank utilizes one Derivative Clearing Organization (Clearinghouse), CME Clearing, for all cleared derivative transactions. Effective January 3, 2017, CME Clearing made certain amendments to its rulebook changing the legal characterization of variation margin payments to be daily settlement payments, which are a component of the derivative fair value, rather than collateral. Initial margin is considered cash collateral.
Derivatives, Offsetting Fair Value Amounts, Policy [Policy Text Block]	The Bank presents derivative instruments, related cash collateral, including initial margin pledged, and associated accrued interest on a net basis by clearing agent and/or by counterparty when it has met the netting requirements. Additional information regarding these agreements is provided in "Note 1 — Basis of Presentation" in this Form 10-Q and "Note 1 - Summary of Significant Accounting Policies" in the 2016 Form 10-K.
Shares Subject to Mandatory Redemption, Changes in Redemption Value, Policy [Policy Text Block]	The Bank reclassifies capital stock subject to redemption from equity to a liability (mandatorily redeemable capital stock) at the time shares meet the definition of a mandatorily redeemable financial instrument. This occurs after a member provides written notice of intention to withdraw from membership, becomes ineligible for continuing membership, or attains non-member status by merger or consolidation, charter termination, or other involuntary termination from membership. Dividends on mandatorily redeemable capital stock are classified as interest expense in the Statements of Income.
Restricted Retained Earnings, Policy [Policy Text Block]	The Bank entered into a Joint Capital Enhancement Agreement (JCE Agreement) with all of the other FHLBanks in February 2011. The JCE Agreement, as amended, is intended to enhance the capital position of the Bank over time. It requires the Bank to allocate 20 percent of its quarterly net income to a separate restricted retained earnings account until the balance of that account equals at least one percent of its average balance of outstanding consolidated obligations for the previous quarter. The restricted retained earnings are not available to pay dividends.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair value amounts are determined by the Bank using available market information and reflect the Bank's best judgment of appropriate valuation methods. The fair value hierarchy requires an entity to maximize the use of significant observable inputs and minimize the use of significant unobservable inputs when measuring fair value. 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 prioritizes the inputs used to measure fair value into three broad levels: • Level 1 Inputs. Quoted prices (unadjusted) for identical assets or liabilities in an active market that the Bank can access on the measurement date. • Level 2 Inputs. 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: (i) quoted prices for similar assets or liabilities in active markets, (ii) quoted prices for identical or similar assets or liabilities in markets that are not active, (iii) 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, implied volatilities, and credit spreads), and (iv) market-corroborated inputs. • Level 3 Inputs. Unobservable inputs for the asset or liability. The Bank reviews its 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. These reclassifications are reported as transfers in/out as of the beginning of the quarter in which the changes occur.
Commitments and Contingencies, Policy [Policy Text Block]	Litigation settlement gains 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. In addition, litigation settlement gains are considered realizable and recorded 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 litigation settlement gains to be gain contingencies, and therefore they are not recorded in the Statements of Income. The Bank records legal expenses related to litigation settlements as incurred in other expenses in the Statements of Income with the exception of certain legal expenses related to litigation settlement awards that are contingent based fees for the attorneys representing the Bank. The Bank incurs and recognizes these contingent based legal fees only when litigation settlement awards are realized, at which time these fees are netted against the gains recognized on the litigation settlement.

Trading Securities (Tables)

Trading Securities (Tables)	6 Months Ended
	Jun. 30, 2017
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities [Table Text Block]	Trading securities were as follows (dollars in millions): June 30, December 31, Non-mortgage-backed securities Other U.S. obligations 1 $ 207 $ 216 GSE and Tennessee Valley Authority obligations 1,612 1,611 Other 2 275 273 Total non-mortgage-backed securities 2,094 2,100 Mortgage-backed securities GSE multifamily 455 453 Total fair value $ 2,549 $ 2,553 1 Represents investment securities backed by the full faith and credit of the U.S. Government. 2 Consists of taxable municipal bonds.

Available-for-Sale Securities (

Available-for-Sale Securities (Tables)	6 Months Ended
	Jun. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]	AFS securities we re as follows (dollars in millions): June 30, 2017 Amortized 1 Gross Gross Fair Value Non-mortgage-backed securities Other U.S. obligations 2 $ 3,325 $ 5 $ (7 ) $ 3,323 GSE and Tennessee Valley Authority obligations 1,278 26 — 1,304 State or local housing agency obligations 989 — (1 ) 988 Other 3 273 8 — 281 Total non-mortgage-backed securities 5,865 39 (8 ) 5,896 Mortgage-backed securities Other U.S. obligations single-family 2 3,936 12 (2 ) 3,946 GSE single-family 1,116 9 — 1,125 GSE multifamily 11,395 51 (10 ) 11,436 Total mortgage-backed securities 16,447 72 (12 ) 16,507 Total $ 22,312 $ 111 $ (20 ) $ 22,403 December 31, 2016 Amortized 1 Gross Gross Fair Value Non-mortgage-backed securities Other U.S. obligations 2 $ 3,537 $ 5 $ (13 ) $ 3,529 GSE and Tennessee Valley Authority obligations 1,341 11 (1 ) 1,351 State or local housing agency obligations 1,010 — (1 ) 1,009 Other 3 272 6 — 278 Total non-mortgage-backed securities 6,160 22 (15 ) 6,167 Mortgage-backed securities Other U.S. obligations single-family 2 3,852 2 (16 ) 3,838 GSE single-family 1,257 7 (3 ) 1,261 GSE multifamily 11,714 30 (41 ) 11,703 Total mortgage-backed securities 16,823 39 (60 ) 16,802 Total $ 22,983 $ 61 $ (75 ) $ 22,969 1 Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments. 2 Represents investment securities backed by the full faith and credit of the U.S. Government. 3 Consists of taxable municipal bonds and/or Private Export Funding Corporation (PEFCO) bonds.
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Schedule of Unrealized Loss on Investments [ Table Text Block]	The following tables summarize AFS securities with unrealized losses by major security type and length of time that individual securities have been in a continuous unrealized loss position (dollars in millions). In cases where the gross unrealized losses for an investment category are less than $1 million, the losses are not reported. June 30, 2017 Less than 12 Months 12 Months or More Total Fair Unrealized Losses Fair Unrealized Losses Fair Unrealized Losses Non-mortgage-backed securities Other U.S. obligations 1 $ 305 $ (1 ) $ 2,356 $ (6 ) $ 2,661 $ (7 ) State or local housing agency obligations 53 — 628 (1 ) 681 (1 ) Total non-mortgage-backed securities 358 (1 ) 2,984 (7 ) 3,342 (8 ) Mortgage-backed securities Other U.S. obligations single-family 1 — — 1,335 (2 ) 1,335 (2 ) GSE single-family 115 — 61 — 176 — GSE multifamily 544 — 3,293 (10 ) 3,837 (10 ) Total mortgage-backed securities 659 — 4,689 (12 ) 5,348 (12 ) Total $ 1,017 $ (1 ) $ 7,673 $ (19 ) $ 8,690 $ (20 ) December 31, 2016 Less than 12 Months 12 Months or More Total Fair Unrealized Losses Fair Unrealized Losses Fair Unrealized Losses Non-mortgage-backed securities Other U.S. obligations 1 $ 209 $ — $ 2,972 $ (12 ) $ 3,181 $ (12 ) GSE and Tennessee Valley Authority obligations — — 126 (1 ) 126 (1 ) State or local housing agency obligations 354 (1 ) 395 (1 ) 749 (2 ) Total non-mortgage-backed securities 563 (1 ) 3,493 (14 ) 4,056 (15 ) Mortgage-backed securities Other U.S. obligations single-family 1 1,123 (2 ) 2,076 (14 ) 3,199 (16 ) GSE single-family 545 (3 ) 32 — 577 (3 ) GSE multifamily 2,713 (6 ) 6,315 (35 ) 9,028 (41 ) Total mortgage-backed securities 4,381 (11 ) 8,423 (49 ) 12,804 (60 ) Total $ 4,944 $ (12 ) $ 11,916 $ (63 ) $ 16,860 $ (75 ) 1 Represents investment securities backed by the full faith and credit of the U.S. Government.
Investments Classified by Contractual Maturity Date [Table Text Block]	The following table summarizes AFS securities by contractual maturity. Expected maturities of some securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment fees (dollars in millions): June 30, 2017 December 31, 2016 Year of Contractual Maturity Amortized Fair Value Amortized Fair Value Non-mortgage-backed securities Due in one year or less $ 227 $ 231 $ 133 $ 134 Due after one year through five years 727 731 489 496 Due after five years through ten years 3,858 3,862 4,452 4,447 Due after ten years 1,053 1,072 1,086 1,090 Total non-mortgage-backed securities 5,865 5,896 6,160 6,167 Mortgage-backed securities 16,447 16,507 16,823 16,802 Total $ 22,312 $ 22,403 $ 22,983 $ 22,969

Held-to-Maturity Securities (Ta

Held-to-Maturity Securities (Tables)	6 Months Ended
	Jun. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities [Table Text Block]	Held-to-maturity (HTM) securities wer e as follows (dollars in millions): June 30, 2017 Amortized 1 Gross Gross Fair Value Non-mortgage-backed securities GSE and Tennessee Valley Authority obligations $ 395 $ 66 $ — $ 461 State or local housing agency obligations 655 2 (9 ) 648 Total non-mortgage-backed securities 1,050 68 (9 ) 1,109 Mortgage-backed securities Other U.S. obligations single-family 2 20 — — 20 Other U.S. obligations commercial 2 3 — — 3 GSE single-family 3,122 7 (10 ) 3,119 Private-label residential 14 — — 14 Total mortgage-backed securities 3,159 7 (10 ) 3,156 Total $ 4,209 $ 75 $ (19 ) $ 4,265 December 31, 2016 Amortized 1 Gross Gross Fair Value Non-mortgage-backed securities GSE and Tennessee Valley Authority obligations $ 397 $ 60 $ (1 ) $ 456 State or local housing agency obligations 688 1 (11 ) 678 Total non-mortgage-backed securities 1,085 61 (12 ) 1,134 Mortgage-backed securities Other U.S. obligations single-family 2 26 — — 26 Other U.S. obligations commercial 2 4 — — 4 GSE single-family 3,543 4 (20 ) 3,527 Private-label residential 16 — (1 ) 15 Total mortgage-backed securities 3,589 4 (21 ) 3,572 Total $ 4,674 $ 65 $ (33 ) $ 4,706 1 Amortized cost includes adjustments made to the cost basis of an investment for accretion or amortization. 2 Represents investment securities backed by the full faith and credit of the U.S. Government.
Held-to-maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Schedule of Unrealized Loss on Investments [ Table Text Block]	The following tables summarize HTM securities with unrealized losses by major security type and the length of time that individual securities have been in a continuous unrealized loss position (dollars in millions). In cases where the gross unrealized losses for an investment category are less than $1 million, the losses are not reported. June 30, 2017 Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Non-mortgage-backed securities State or local housing agency obligations $ 1 $ — $ 268 $ (9 ) $ 269 $ (9 ) Total non-mortgage-backed securities 1 — 268 (9 ) 269 (9 ) Mortgage-backed securities Other U.S. obligations single-family 1 10 — 1 — 11 — Other U.S. obligations commercial 1 — — 2 — 2 — GSE single-family 800 (7 ) 937 (3 ) 1,737 (10 ) Private-label residential — — 9 — 9 — Total mortgage-backed securities 810 (7 ) 949 (3 ) 1,759 (10 ) Total $ 811 $ (7 ) $ 1,217 $ (12 ) $ 2,028 $ (19 ) December 31, 2016 Less than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Non-mortgage backed securities GSE and Tennessee Valley Authority obligations $ 73 $ (1 ) $ — $ — $ 73 $ (1 ) State or local housing agency obligations 291 (11 ) 10 — 301 (11 ) Total non-mortgage-backed securities 364 (12 ) 10 — 374 (12 ) Mortgage-backed securities Other U.S. obligations single-family 1 12 — — — 12 — Other U.S. obligations commercial 1 — — 3 — 3 — GSE single-family 1,918 (15 ) 1,224 (5 ) 3,142 (20 ) Private-label residential 5 — 10 (1 ) 15 (1 ) Total mortgage-backed securities 1,935 (15 ) 1,237 (6 ) 3,172 (21 ) Total $ 2,299 $ (27 ) $ 1,247 $ (6 ) $ 3,546 $ (33 ) 1 Represents investment securities backed by the full faith and credit of the U.S. Government.
Investments Classified by Contractual Maturity Date [Table Text Block]	The following table summarizes HTM securities by contractual maturity. Expected maturities of some securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment fees (dollars in millions): June 30, 2017 December 31, 2016 Year of Contractual Maturity Amortized Fair Value Amortized Fair Value Non-mortgage-backed securities Due in one year or less $ 11 $ 11 $ 11 $ 11 Due after one year through five years 55 55 62 62 Due after five years through ten years 363 397 367 399 Due after ten years 621 646 645 662 Total non-mortgage-backed securities 1,050 1,109 1,085 1,134 Mortgage-backed securities 3,159 3,156 3,589 3,572 Total $ 4,209 $ 4,265 $ 4,674 $ 4,706

Advances (Tables)

Advances (Tables)	6 Months Ended
	Jun. 30, 2017
Advances [Abstract]
Schedule of Federal Home Loan Bank Advances by Year of Contractual Maturity [Table Text Block]	The following table summarizes the Bank's advances outstanding by contractual maturity (dollars in millions): June 30, 2017 December 31, 2016 Year of Contractual Maturity Amount Weighted Amount Weighted Overdrawn demand deposit accounts $ 3 4.31 % $ 1 3.81 % Due in one year or less 42,781 1.45 22,532 1.13 Due after one year through two years 19,797 1.45 29,791 1.12 Due after two years through three years 14,030 1.48 30,023 0.98 Due after three years through four years 21,118 1.41 17,615 1.00 Due after four years through five years 8,707 1.72 17,197 1.11 Thereafter 12,402 1.80 14,378 1.11 Total par value 118,838 1.50 % 131,537 1.07 % Premiums 65 83 Discounts (5 ) (7 ) Fair value hedging adjustments (20 ) (12 ) Total $ 118,878 $ 131,601 The following table summarizes all advances by year of contractual maturity or next call date for callable advances, and by year of contractual maturity or next put date for putable advances (dollars in millions): Year of Contractual Maturity Year of Contractual Maturity or Next Put Date June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 Overdrawn demand deposit accounts $ 3 $ 1 $ 3 $ 1 Due in one year or less 79,669 93,471 43,130 23,532 Due after one year through two years 17,712 9,978 19,640 28,983 Due after two years through three years 9,390 15,515 14,030 30,023 Due after three years through four years 2,841 2,734 20,980 17,615 Due after four years through five years 6,906 7,670 8,674 17,026 Thereafter 2,317 2,168 12,381 14,357 Total par value $ 118,838 $ 131,537 $ 118,838 $ 131,537
Schedule of Prepayment Fees on Advances [Table Text Block]	The following table summarizes the Bank's prepayment fees on advances, net (dollars in millions): For the Three Months Ended For the Six Months Ended June 30, June 30, 2017 2016 2017 2016 Prepayment fee income $ 1 $ 2 $ 1 $ 9 Fair value hedging adjustments 1 — (1 ) — (4 ) Prepayment fees on advances, net $ 1 $ 1 $ 1 $ 5 1 Represents the amortization/accretion of fair value hedging adjustments on closed advance hedge relationships resulting from advance prepayments.

Mortgage Loans Held for Portf31

Mortgage Loans Held for Portfolio (Tables)	6 Months Ended
	Jun. 30, 2017
Mortgage Loans on Real Estate [Abstract]
Mortgage Loans Held for Portfolio [Table Text Block]	The following tables present information on the Bank's mortgage loans held for portfolio (dollars in millions): June 30, 2017 MPF MPP Total Fixed rate, long-term single-family mortgage loans $ 5,440 $ 347 $ 5,787 Fixed rate, medium-term 1 single-family mortgage loans 1,071 3 1,074 Total unpaid principal balance 6,511 350 6,861 Premiums 85 11 96 Discounts (7 ) — (7 ) Basis adjustments from mortgage loan commitments 5 — 5 Total mortgage loans held for portfolio 6,594 361 6,955 Allowance for credit losses (2 ) — (2 ) Total mortgage loans held for portfolio, net $ 6,592 $ 361 $ 6,953 December 31, 2016 MPF MPP Total Fixed rate, long-term single-family mortgage loans $ 5,272 $ 397 $ 5,669 Fixed rate, medium-term 1 single-family mortgage loans 1,148 6 1,154 Total unpaid principal balance 6,420 403 6,823 Premiums 82 14 96 Discounts (8 ) (1 ) (9 ) Basis adjustments from mortgage loan commitments 5 — 5 Total mortgage loans held for portfolio 6,499 416 6,915 Allowance for credit losses (2 ) — (2 ) Total mortgage loans held for portfolio, net $ 6,497 $ 416 $ 6,913 1 Medium-term is defined as a term of 15 years or less. The following tables present the Bank's mortgage loans held for portfolio by collateral or guarantee type (dollars in millions): June 30, 2017 MPF MPP Total Conventional mortgage loans $ 6,007 $ 315 $ 6,322 Government-insured mortgage loans 504 35 539 Total unpaid principal balance $ 6,511 $ 350 $ 6,861 December 31, 2016 MPF MPP Total Conventional mortgage loans $ 5,907 $ 361 $ 6,268 Government-insured mortgage loans 513 42 555 Total unpaid principal balance $ 6,420 $ 403 $ 6,823

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2017
Allowance for Credit Losses [Abstract]
Allowance for Credit Losses by Impairment Methodology [Table Text Block]	The following table summarizes the allowance for credit losses and the recorded investment of the Bank's conventional mortgage loan portfolio by impairment methodology (dollars in millions): MPF MPP 1 Total Allowance for credit losses, June 30, 2017 Collectively evaluated for impairment $ 2 $ — $ 2 Allowance for credit losses, December 31, 2016 Collectively evaluated for impairment $ 2 $ — $ 2 Recorded investment, June 30, 2017 2 Collectively evaluated for impairment $ 6,067 $ 302 $ 6,369 Individually evaluated for impairment, without a related allowance 43 23 66 Total recorded investment $ 6,110 $ 325 $ 6,435 Recorded investment, December 31, 2016 2 Collectively evaluated for impairment $ 5,960 $ 346 $ 6,306 Individually evaluated for impairment, without a related allowance 45 27 72 Total recorded investment $ 6,005 $ 373 $ 6,378 1 The allowance for credit losses on MPP loans was less than $1 million at June 30, 2017 and December 31, 2016. 2 Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs.
Past Due Financing Receivables [Table Text Block]	The table below summarizes the Bank's key credit quality indicators for mortgage loans at June 30, 2017 (dollars in millions): June 30, 2017 MPF MPP Conventional Government Conventional Government Total Past due 30 - 59 days $ 46 $ 16 $ 9 $ 4 $ 75 Past due 60 - 89 days 12 5 4 — 21 Past due 90 - 179 days 8 4 3 — 15 Past due 180 days or more 16 5 9 1 31 Total past due mortgage loans 82 30 25 5 142 Total current mortgage loans 6,028 487 300 32 6,847 Total recorded investment of mortgage loans 1 $ 6,110 $ 517 $ 325 $ 37 $ 6,989 In process of foreclosure (included above) 2 $ 12 $ 2 $ 5 $ — $ 19 Serious delinquency rate 3 — % 2 % 4 % 2 % 1 % Past due 90 days or more and still accruing interest 4 $ — $ 9 $ — $ 1 $ 10 Non-accrual mortgage loans 5 $ 29 $ — $ 21 $ — $ 50 1 Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs. 2 Includes loans where the decision of foreclosure or similar alternative such as pursuit of deed-in-lieu has been reported. Loans in process of foreclosure are included in past due or current loans depending on their payment status. 3 Represents mortgage loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total recorded investment. 4 Represents government-insured mortgage loans that are 90 days or more past due. 5 Represents conventional mortgage loans that are 90 days or more past due and TDRs. The table below summarizes the Bank's key credit quality indicators for mortgage loans at December 31, 2016 (dollars in millions): December 31, 2016 MPF MPP Conventional Government Conventional Government Total Past due 30 - 59 days $ 50 $ 18 $ 11 $ 4 $ 83 Past due 60 - 89 days 17 7 5 2 31 Past due 90 - 179 days 9 6 2 1 18 Past due 180 days or more 22 5 12 2 41 Total past due mortgage loans 98 36 30 9 173 Total current mortgage loans 5,907 491 343 35 6,776 Total recorded investment of mortgage loans 1 $ 6,005 $ 527 $ 373 $ 44 $ 6,949 In process of foreclosure (included above) 2 $ 16 $ 2 $ 7 $ — $ 25 Serious delinquency rate 3 1 % 2 % 4 % 7 % 1 % Past due 90 days or more and still accruing interest 4 $ — $ 11 $ — $ 3 $ 14 Non-accrual mortgage loans 5 $ 36 $ — $ 24 $ — $ 60 1 Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs. 2 Includes loans where the decision of foreclosure or similar alternative such as pursuit of deed-in-lieu has been reported. Loans in process of foreclosure are included in past due or current loans depending on their payment status. 3 Represents mortgage loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total recorded investment. 4 Represents government-insured mortgage loans that are 90 days or more past due. 5 Represents conventional mortgage loans that are 90 days or more past due and TDRs.
Impaired Financing Receivables [Table Text Block]	The following table summarizes the average recorded investment of the Bank's individually evaluated impaired loans (dollars in millions): For the Three Months Ended For the Six Months Ended June 30, June 30, 2017 2016 2017 2016 Impaired loans without an allowance Conventional MPF Loans $ 45 $ 34 $ 44 $ 35 Conventional MPP Loans 23 27 25 28 Total $ 68 $ 61 $ 69 $ 63

Derivatives and Hedging Activ33

Derivatives and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Offsetting Assets [Table Text Block]	The following table presents the fair value of derivative instruments meeting or not meeting the netting requirements, including the related collateral received from or pledged to counterparties and variation margin for daily settled contracts (dollars in millions): June 30, 2017 December 31, 2016 Derivative Assets Derivative Liabilities Derivative Assets Derivative Liabilities Derivative instruments meeting netting requirements Gross recognized amount Uncleared derivatives $ 79 $ 223 $ 97 $ 263 Cleared derivatives 101 443 107 481 Total gross recognized amount 180 666 204 744 Gross amounts of netting adjustments, cash collateral, and variation margin for daily settled contracts Uncleared derivatives (68 ) (200 ) (95 ) (187 ) Cleared derivatives 27 (443 ) 82 (481 ) Total gross amounts of netting adjustments, cash collateral, and variation margin for daily settled contracts (41 ) (643 ) (13 ) (668 ) Net amounts after netting adjustments, cash collateral, and variation margin for daily settled contracts Uncleared derivatives 11 23 2 76 Cleared derivatives 128 — 189 — Total derivative assets and derivative liabilities $ 139 $ 23 $ 191 $ 76
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following table summarizes the Bank's notional amount and the fair value of derivative instruments, including the effect of netting adjustments, cash collateral, and variation margin for daily settled contracts. For purposes of this disclosure, the derivative values include the fair value of derivatives and the related accrued interest (dollars in millions): June 30, 2017 December 31, 2016 Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments (fair value hedges) Interest rate swaps $ 50,686 $ 162 $ 611 $ 51,896 $ 183 $ 688 Derivatives not designated as hedging instruments (economic hedges) Interest rate swaps 1,380 18 55 1,414 20 56 Forward settlement agreements (TBAs) 110 — — 94 1 — Mortgage delivery commitments 113 — — 102 — — Total derivatives not designated as hedging instruments 1,603 18 55 1,610 21 56 Total derivatives before netting and collateral adjustments $ 52,289 180 666 $ 53,506 204 744 Netting adjustments, cash collateral, and variation margin for daily settled contracts 1 (41 ) (643 ) (13 ) (668 ) Total derivative assets and derivative liabilities $ 139 $ 23 $ 191 $ 76 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions, cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty, and includes fair value adjustments on derivatives for variation margin, which effective January 3, 2017, is characterized as a daily settled contract. Cash collateral posted by the Bank (including accrued interest) was $264 million and $658 million at June 30, 2017 and December 31, 2016. At June 30, 2017 the Bank did not receive cash collateral from clearing agents and/or counterparties. At December 31, 2016, the Bank received cash collateral from clearing agents and/or counterparties of $2 million . Variation margin for daily settled contracts was $339 million at June 30, 2017 . Variation margin was considered cash collateral prior to January 3, 2017.
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	The following table summarizes the components of “Net gains (losses) on derivatives and hedging activities” as presented in the Statements of Income (dollars in millions): For the Three Months Ended For the Six Months Ended June 30, June 30, 2017 2016 2017 2016 Derivatives designated as hedging instruments (fair value hedges) Interest rate swaps $ 6 $ (8 ) $ 10 $ (9 ) Derivatives not designated as hedging instruments (economic hedges) Interest rate swaps (6 ) (18 ) (1 ) (55 ) Forward settlement agreements (TBAs) — (2 ) (1 ) (3 ) Mortgage delivery commitments — 2 1 3 Net interest settlements (3 ) (4 ) (7 ) (9 ) Total net gains (losses) related to derivatives not designated as hedging instruments (9 ) (22 ) (8 ) (64 ) Other 1 — — 1 — Net gains (losses) on derivatives and hedging activities $ (3 ) $ (30 ) $ 3 $ (73 ) 1 Consists of price alignment amount on derivatives for variation margin which is characterized as a daily settled contract.
Schedule of Derivative Instruments By Type, Gain (Loss) in Statement of Financial Performance [Table Text Block]	The following tables summarize, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair value hedging relationships, the net fair value hedge ineffectiveness, and the effect of those derivatives on the Bank's net interest income (dollars in millions): For the Three Months Ended June 30, 2017 Hedged Item Type Gains (Losses) on Derivatives Gains (Losses) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect on Net Interest Income 1 Available-for-sale investments $ (41 ) $ 49 $ 8 $ (24 ) Advances 2 (25 ) 26 1 (21 ) Consolidated obligation bonds 72 (75 ) (3 ) 7 Total $ 6 $ — $ 6 $ (38 ) For the Three Months Ended June 30, 2016 Hedged Item Type Gains (Losses) on Derivatives Gains (Losses) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect on Net Interest Income 1 Available-for-sale investments $ (128 ) $ 120 $ (8 ) $ (36 ) Advances 2 (42 ) 41 (1 ) (37 ) Consolidated obligation bonds 84 (83 ) 1 18 Total $ (86 ) $ 78 $ (8 ) $ (55 ) 1 Represents the net interest settlements on derivatives in fair value hedge relationships and the amortization of the financing element of off-market derivatives, both of which are included in the interest income or interest expense line item of the respective hedged item type. This amortization for off-market derivatives totaled $4 million and $8 million for the three months ended June 30, 2017 and 2016. 2 Includes net gains (losses) on fair value hedge firm commitments of forward starting advances. The following tables summarize, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair value hedging relationships, the net fair value hedge ineffectiveness, and the effect of those derivatives on the Bank's net interest income (dollars in millions): For the Six Months Ended June 30, 2017 Hedged Item Type Gains (Losses) on Derivatives Gains (Losses) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect on Net Interest Income 1 Available-for-sale investments $ (4 ) $ 18 $ 14 $ (53 ) Advances 2 8 (6 ) 2 (45 ) Consolidated obligation bonds 22 (28 ) (6 ) 26 Total $ 26 $ (16 ) $ 10 $ (72 ) For the Six Months Ended June 30, 2016 Hedged Item Type Gains (Losses) on Derivatives Gains (Losses) on Hedged Items Net Fair Value Hedge Ineffectiveness Effect on Net Interest Income 1 Available-for-sale investments $ (404 ) $ 401 $ (3 ) $ (74 ) Advances 2 (178 ) 179 1 (77 ) Consolidated obligation bonds 152 (159 ) (7 ) 33 Total $ (430 ) $ 421 $ (9 ) $ (118 ) 1 Represents the net interest settlements on derivatives in fair value hedge relationships and the amortization of the financing element of off-market derivatives, both of which are included in the interest income or interest expense line item of the respective hedged item type. This amortization for off-market derivatives totaled $9 million and $16 million for the six months ended June 30, 2017 and 2016. 2 Includes net gains (losses) on fair value hedge firm commitments of forward starting advances.
Offsetting Assets and Liabilities [Table Text Block]	The following table presents the fair value of derivative instruments meeting or not meeting the netting requirements, including the related collateral received from or pledged to counterparties and variation margin for daily settled contracts (dollars in millions): June 30, 2017 December 31, 2016 Derivative Assets Derivative Liabilities Derivative Assets Derivative Liabilities Derivative instruments meeting netting requirements Gross recognized amount Uncleared derivatives $ 79 $ 223 $ 97 $ 263 Cleared derivatives 101 443 107 481 Total gross recognized amount 180 666 204 744 Gross amounts of netting adjustments, cash collateral, and variation margin for daily settled contracts Uncleared derivatives (68 ) (200 ) (95 ) (187 ) Cleared derivatives 27 (443 ) 82 (481 ) Total gross amounts of netting adjustments, cash collateral, and variation margin for daily settled contracts (41 ) (643 ) (13 ) (668 ) Net amounts after netting adjustments, cash collateral, and variation margin for daily settled contracts Uncleared derivatives 11 23 2 76 Cleared derivatives 128 — 189 — Total derivative assets and derivative liabilities $ 139 $ 23 $ 191 $ 76

Consolidated Obligations (Table

Consolidated Obligations (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Schedule of Short-term Debt [Table Text Block]	The following table summarizes the Bank's discount notes (dollars in millions): June 30, 2017 December 31, 2016 Amount Weighted Average Interest Rate Amount Weighted Average Interest Rate Par value $ 66,668 0.91 % $ 81,019 0.49 % Discounts and concessions 1 (110 ) (72 ) Total $ 66,558 $ 80,947 1 Concessions represent fees paid to dealers in connections with the issuance of certain consolidated obligation discount notes.
Schedule of Maturities of Long-term Debt [Table Text Block]	The following table summarizes the Bank's bonds outstanding by contractual maturity (dollars in millions): June 30, 2017 December 31, 2016 Year of Contractual Maturity Amount Weighted Average Interest Rate Amount Weighted Average Interest Rate Due in one year or less $ 48,266 1.05 % $ 47,733 0.88 % Due after one year through two years 17,427 1.28 13,135 0.94 Due after two years through three years 10,047 1.73 15,414 1.48 Due after three years through four years 2,015 2.71 2,288 3.28 Due after four years through five years 6,799 1.67 7,152 1.66 Thereafter 4,768 3.03 4,331 3.04 Total par value 89,322 1.36 % 90,053 1.22 % Premiums 224 254 Discounts and concessions 1 (69 ) (79 ) Fair value hedging adjustments (306 ) (330 ) Total $ 89,171 $ 89,898 1 Concessions represent fees paid to dealers in connections with the issuance of certain consolidated obligation bonds.
Schedule of Long-term Debt by Call Feature [Table Text Block]	The following table summarizes the Bank's bonds outstanding by call features (dollars in millions): June 30, December 31, Noncallable or nonputable $ 86,408 $ 87,804 Callable 2,914 2,249 Total par value $ 89,322 $ 90,053

Capital (Tables)

Capital (Tables)	6 Months Ended
	Jun. 30, 2017
Capital [Abstract]
Mandatorily Redeemable Capital Stock [Table Text Block]	The following tables summarizes changes in mandatorily redeemable capital stock (dollars in millions): For the Three Months Ended June 30, 2017 2016 Balance, beginning of period $ 494 $ 732 Capital stock reclassified to (from) mandatorily redeemable capital stock, net 18 1 Repurchases/redemptions of mandatorily redeemable capital stock (32 ) (35 ) Balance, end of period $ 480 $ 698 For the Six Months Ended June 30, 2017 2016 Balance, beginning of period $ 664 $ 103 Capital stock reclassified to (from) mandatorily redeemable capital stock, net 28 731 Repurchases/redemptions of mandatorily redeemable capital stock (212 ) (136 ) Balance, end of period $ 480 $ 698 The following table summarizes the Bank's mandatorily redeemable capital stock by year of contractual redemption (dollars in millions): Year of Contractual Redemption 1 June 30, 2017 December 31, 2016 Due in one year or less $ 4 $ 4 Due after one year through two years — 5 Due after two years through three years 4 4 Due after three years through four years 1 — Due after four years through five years 21 1 Thereafter 2 433 631 Past contractual redemption date due to outstanding activity with the Bank 17 19 Total $ 480 $ 664 1 At the Bank's election, the mandatorily redeemable capital stock may be redeemed prior to the expiration of the five year redemption period that commences on the date of the notice of redemption, or in the case of captive insurance company members, on the date of the membership termination. 2 Represents mandatorily redeemable capital stock resulting from the Finance Agency rule previously discussed that makes captive insurance companies ineligible for FHLBank membership. The related mandatorily redeemable capital stock is not required to be redeemed until five years after the member's termination.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes changes in accumulated other comprehensive income (AOCI) (dollars in millions): Net unrealized gains (losses) on AFS securities (Note 4) Pension and postretirement benefits Total AOCI Balance, March 31, 2016 $ (119 ) $ (3 ) $ (122 ) Other comprehensive income (loss) before reclassifications Net unrealized gains (losses) on AFS securities 36 — 36 Reclassifications from other comprehensive income (loss) to net income Amortization - pension and postretirement — 1 1 Net current period other comprehensive income (loss) 36 1 37 Balance, June 30, 2016 $ (83 ) $ (2 ) $ (85 ) Balance, March 31, 2017 $ 50 $ (3 ) $ 47 Other comprehensive income (loss) before reclassifications Net unrealized gains (losses) on AFS securities 41 — 41 Reclassifications from other comprehensive income (loss) to net income Amortization - pension and postretirement — 1 1 Net current period other comprehensive income (loss) 41 1 42 Balance, June 30, 2017 $ 91 $ (2 ) $ 89 Balance, December 31, 2015 $ (82 ) $ (2 ) $ (84 ) Other comprehensive income (loss) before reclassifications Net unrealized gains (losses) on AFS securities (1 ) — (1 ) Net current period other comprehensive income (loss) (1 ) — (1 ) Balance, June 30, 2016 $ (83 ) $ (2 ) $ (85 ) Balance, December 31, 2016 $ (14 ) $ (4 ) $ (18 ) Other comprehensive income (loss) before reclassifications Net unrealized gains (losses) on AFS securities 105 — 105 Reclassifications from other comprehensive income (loss) to net income Amortization - pension and postretirement — 2 2 Net current period other comprehensive income (loss) 105 2 107 Balance, June 30, 2017 $ 91 $ (2 ) $ 89
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	The following table shows the Bank's compliance with the Finance Agency's regulatory capital requirements (dollars in millions): June 30, 2017 December 31, 2016 Required Actual Required Actual Regulatory capital requirements Risk-based capital $ 940 $ 7,787 $ 1,046 $ 8,031 Regulatory capital $ 6,600 $ 7,787 $ 7,224 $ 8,083 Leverage capital $ 8,249 $ 11,681 $ 9,030 $ 12,098 Capital-to-assets ratio 4.00 % 4.72 % 4.00 % 4.48 % Leverage ratio 5.00 % 7.08 % 5.00 % 6.70 %

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping [Table Text Block]	The following table summarizes the carrying value, fair value, and fair value hierarchy of the Bank's financial instruments at June 30, 2017 (dollars in millions). The fair values do 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 assets and liabilities. Fair Value Financial Instruments Carrying Value Level 1 Level 2 Level 3 Netting Adjustment 1 Total Assets Cash and due from banks $ 964 $ 964 $ — $ — $ — $ 964 Interest-bearing deposits 2 — 2 — — 2 Securities purchased under agreements to resell 3,500 — 3,500 — — 3,500 Federal funds sold 5,100 — 5,100 — — 5,100 Trading securities 2,549 — 2,549 — — 2,549 Available-for-sale securities 22,403 — 22,403 — — 22,403 Held-to-maturity securities 4,209 — 4,251 14 — 4,265 Advances 118,878 — 119,119 — — 119,119 Mortgage loans held for portfolio, net 6,953 — 6,981 69 — 7,050 Accrued interest receivable 206 — 206 — — 206 Derivative assets, net 139 — 180 — (41 ) 139 Other assets 26 26 — — — 26 Liabilities Deposits (964 ) — (964 ) — — (964 ) Consolidated obligations Discount notes (66,558 ) — (66,550 ) — — (66,550 ) Bonds (89,171 ) — (89,636 ) — — (89,636 ) Total consolidated obligations (155,729 ) — (156,186 ) — — (156,186 ) Mandatorily redeemable capital stock (480 ) (480 ) — — — (480 ) Accrued interest payable (209 ) — (209 ) — — (209 ) Derivative liabilities, net (23 ) — (666 ) — 643 (23 ) 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. In addition, the amount includes the fair value adjustments on derivatives for variation margin which is characterized as a daily settled contract. The following table summarizes the carrying value, fair value, and fair value hierarchy of the Bank's financial instruments at December 31, 2016 (dollars in millions): Fair Value Financial Instruments Carrying Value Level 1 Level 2 Level 3 Netting Adjustment 1 Total Assets Cash and due from banks $ 223 $ 223 $ — $ — $ — $ 223 Interest-bearing deposits 2 — 2 — — 2 Securities purchased under agreements to resell 5,925 — 5,925 — — 5,925 Federal funds sold 5,095 — 5,095 — — 5,095 Trading securities 2,553 — 2,553 — — 2,553 Available-for-sale securities 22,969 — 22,969 — — 22,969 Held-to-maturity securities 4,674 — 4,691 15 — 4,706 Advances 131,601 — 131,772 — — 131,772 Mortgage loans held for portfolio, net 6,913 — 6,918 71 — 6,989 Loans to other FHLBanks 200 — 200 — — 200 Accrued interest receivable 197 — 197 — — 197 Derivative assets, net 191 — 204 — (13 ) 191 Other assets 24 24 — — — 24 Liabilities Deposits (1,113 ) — (1,113 ) — — (1,113 ) Consolidated obligations Discount notes (80,947 ) — (80,943 ) — — (80,943 ) Bonds (89,898 ) — (90,370 ) — — (90,370 ) Total consolidated obligations (170,845 ) — (171,313 ) — — (171,313 ) Mandatorily redeemable capital stock (664 ) (664 ) — — — (664 ) Accrued interest payable (180 ) — (180 ) — — (180 ) Derivative liabilities, net (76 ) — (744 ) — 668 (76 ) 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table summarizes, for each hierarchy level, the Bank's assets and liabilities that are measured at fair value in the Statements of Condition a t June 30, 2017 (dollar s in millions): Recurring Fair Value Measurements Level 1 Level 2 Level 3 Netting Adjustment 1 Total Assets Trading securities Other U.S. obligations $ — $ 207 $ — $ — $ 207 GSE and Tennessee Valley Authority obligations — 1,612 — — 1,612 Other non-MBS — 275 — — 275 GSE multifamily MBS — 455 — — 455 Total trading securities — 2,549 — — 2,549 Available-for-sale securities Other U.S. obligations — 3,323 — — 3,323 GSE and Tennessee Valley Authority obligations — 1,304 — — 1,304 State or local housing agency obligations — 988 — — 988 Other non-MBS — 281 — — 281 Other U.S. obligations single-family MBS — 3,946 — — 3,946 GSE single-family MBS — 1,125 — — 1,125 GSE multifamily MBS — 11,436 — — 11,436 Total available-for-sale securities — 22,403 — — 22,403 Derivative assets, net Interest-rate related — 180 — (41 ) 139 Other assets 26 — — — 26 Total recurring assets at fair value $ 26 $ 25,132 $ — $ (41 ) $ 25,117 Liabilities Derivative liabilities, net Interest-rate related — (666 ) — 643 (23 ) Total recurring liabilities at fair value $ — $ (666 ) $ — $ 643 $ (23 ) 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. In addition, the amount includes the fair value adjustments on derivatives for variation margin which is characterized as a daily settled contract. The following table summarizes, for each hierarchy level, the Bank's assets and liabilities that are measured at fair value in the Statements of Condition at December 31, 2016 (dollars in millions): Recurring Fair Value Measurements Level 1 Level 2 Level 3 Netting Adjustment 1 Total Assets Trading securities Other U.S. obligations $ — $ 216 $ — $ — $ 216 GSE and Tennessee Valley Authority obligations — 1,611 — — 1,611 Other non-MBS — 273 — — 273 GSE multifamily MBS — 453 — — 453 Total trading securities — 2,553 — — 2,553 Available-for-sale securities Other U.S. obligations — 3,529 — — 3,529 GSE and Tennessee Valley Authority obligations — 1,351 — — 1,351 State or local housing agency obligations — 1,009 — — 1,009 Other non-MBS — 278 — — 278 Other U.S. obligations single-family MBS — 3,838 — — 3,838 GSE single-family MBS — 1,261 — — 1,261 GSE multifamily MBS — 11,703 — — 11,703 Total available-for-sale securities — 22,969 — — 22,969 Derivative assets, net Interest-rate related — 204 — (13 ) 191 Other assets 24 — — — 24 Total recurring assets at fair value $ 24 $ 25,726 $ — $ (13 ) $ 25,737 Liabilities Derivative liabilities, net Interest-rate related — (744 ) — 668 (76 ) Total recurring liabilities at fair value $ — $ (744 ) $ — $ 668 $ (76 ) 1 Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty.
Fair Value Measurement, Nonrecurring [Table Text Block}

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Off-Balance Sheet Commitments [Table Text Block]	The following table summarizes additional off-balance sheet commitments for the Bank (dollars in millions): June 30, 2017 December 31, 2016 Expire within one year Expire after one year Total Total Standby letters of credit $ 7,487 $ 156 $ 7,643 $ 7,281 Standby bond purchase agreements 124 575 699 458 Commitments to purchase mortgage loans 113 — 113 102 Commitments to issue bonds 360 — 360 — Commitments to issue discount notes 15 — 15 — Commitments to fund advances 1,032 28 1,060 280

Activities with Stockholders (T

Activities with Stockholders (Tables)	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions by Balance Sheet Grouping [Table Text Block]	The following table summarizes the Bank's outstanding transactions with Directors' Financial Institutions (dollars in millions): June 30, 2017 December 31, 2016 Amount % of Total Amount % of Total Advances $ 5,386 5 $ 2,497 2 Mortgage loans 57 1 186 3 Deposits 23 2 82 7 Capital stock 270 4 157 2
Schedule Of Related Party Transactions By Related Party [Tables Text Block]	At June 30, 2017 , the Bank had the following business concentrations with stockholders (dollars in millions): Capital Stock Mortgage Interest Stockholder Amount % of Total 1 Advances Loans Income 2 Wells Fargo Bank, N.A. $ 2,510 41 $ 62,500 $ — $ 390 Superior Guaranty Insurance Company 3 25 — — 596 — Wells Fargo Bank Northwest, N.A. 3 1 — — 33 — Total $ 2,536 41 $ 62,500 $ 629 $ 390 1 Pursuant to applicable Finance Agency regulations, the Bank's voting structure limits the voting rights of these stockholders and other members holding a significant amount of the Bank's capital stock. 2 Represents interest income earned on advances during the six months ended June 30, 2017 . Interest income on mortgage loans is excluded from this table as this interest relates to the borrower, not to the stockholder. 3 Superior Guaranty Insurance Company and Wells Fargo Bank Northwest, N.A. are affiliates of Wells Fargo Bank, N.A. At December 31, 2016 , the Bank had the following business concentrations with stockholders (dollars in millions): Capital Stock Mortgage Interest Stockholder Amount % of Total 1 Advances Loans Income 2 Wells Fargo Bank, N.A. $ 3,093 47 $ 77,075 $ — $ 429 Superior Guaranty Insurance Company 3 28 1 — 683 — Wells Fargo Bank Northwest N.A. 3 2 — — 38 — Total $ 3,123 48 $ 77,075 $ 721 $ 429 1 Pursuant to applicable Finance Agency regulations, the Bank's voting structure limits the voting rights of these stockholders and other members holding a significant amount of the Bank's capital stock. 2 Represents interest income earned on advances during the year ended December 31, 2016 . Interest income on mortgage loans is excluded from this table as this interest relates to the borrower, not to the stockholder. 3 Superior Guaranty Insurance Company and Wells Fargo Bank Northwest, N.A. are affiliates of Wells Fargo Bank, N.A.

Activities with Other FHLBanks

Activities with Other FHLBanks (Tables)	6 Months Ended
	Jun. 30, 2017
Activities with Other FHLBanks [Abstract]
Schedule of Loans to Other Federal Home Loan Banks [Table Text Block]	The following table summarizes loan activity to other FHLBanks during the six months ended June 30, 2017 (dollars in millions): Other FHLBank Beginning Balance Loans Principal Repayment Ending Balance 2017 San Francisco $ 200 $ — $ (200 ) $ — During the six months ended June 30, 2017 , the Bank did not borrow funds from other FHLBanks. The following table summarizes borrowing activity from other FHLBanks during the six months ended June 30, 2016 (dollars in millions): Other FHLBank Beginning Balance Borrowing Principal Payment Ending Balance 2016 San Francisco $ — $ 200 $ (200 ) $ —

Background Information (Details

Background Information (Details)	Jun. 30, 2017bank
Background Information [Abstract]
Number of Federal Home Loan Banks	11

Trading Securities (Major Secur

Trading Securities (Major Security Types) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities		$ 2,549	$ 2,553
Other U.S. obligations [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	[1]	207	216
GSE obligations [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities		1,612	1,611
Other [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities	[2]	275	273
Non-mortgage-backed securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities		2,094	2,100
Multifamily [Member] | Mortgage-backed securities, GSE [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities		$ 455	$ 453
[1]	Represents investment securities backed by the full faith and credit of the U.S. Government.
[2]	Consists of taxable municipal bonds.

Trading Securities (Net Gains (

Trading Securities (Net Gains (Losses) on Trading Securities) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Trading Securities [Abstract]
Trading Securities, Realized Gain (Loss)	$ 0	$ 0	$ 0	$ 0
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ 4	$ 18	$ 9	$ 53

Available-for-Sale Securities43

Available-for-Sale Securities (Major Security Types) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1]	$ 22,312	$ 22,983
Gross Unrealized Gains		111	61
Gross Unrealized Losses		(20)	(75)
Fair Value		22,403	22,969
Other U.S. obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1],[2]	3,325	3,537
Gross Unrealized Gains	[2]	5	5
Gross Unrealized Losses	[2]	(7)	(13)
Fair Value	[2]	3,323	3,529
GSE obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1]	1,278	1,341
Gross Unrealized Gains		26	11
Gross Unrealized Losses		0	(1)
Fair Value		1,304	1,351
State or local housing agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1]	989	1,010
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(1)	(1)
Fair Value		988	1,009
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1],[3]	273	272
Gross Unrealized Gains	[3]	8	6
Gross Unrealized Losses	[3]	0	0
Fair Value	[3]	281	278
Non-mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1]	5,865	6,160
Gross Unrealized Gains		39	22
Gross Unrealized Losses		(8)	(15)
Fair Value		5,896	6,167
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1]	16,447	16,823
Gross Unrealized Gains		72	39
Gross Unrealized Losses		(12)	(60)
Fair Value		16,507	16,802
Single Family [Member] | Other U.S. obligations MBS [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1],[2]	3,936	3,852
Gross Unrealized Gains	[2]	12	2
Gross Unrealized Losses	[2]	(2)	(16)
Fair Value	[2]	3,946	3,838
Single Family [Member] | Mortgage-backed securities, GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1]	1,116	1,257
Gross Unrealized Gains		9	7
Gross Unrealized Losses		0	(3)
Fair Value		1,125	1,261
Multifamily [Member] | Mortgage-backed securities, GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1]	11,395	11,714
Gross Unrealized Gains		51	30
Gross Unrealized Losses		(10)	(41)
Fair Value		$ 11,436	$ 11,703
[1]	Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments.
[2]	Represents investment securities backed by the full faith and credit of the U.S. Government.
[3]	Consists of taxable municipal bonds and/or Private Export Funding Corporation (PEFCO) bonds.

Available-for-Sale Securities44

Available-for-Sale Securities (Unrealized Losses) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		$ 1,017	$ 4,944
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		(1)	(12)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		7,673	11,916
Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		(19)	(63)
Continuous Unrealized Loss Position, Fair Value		8,690	16,860
Continuous Unrealized Loss Position, Unrealized Losses		(20)	(75)
Other U.S. obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	[1]	305	209
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	[1]	(1)	0
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	[1]	2,356	2,972
Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	[1]	(6)	(12)
Continuous Unrealized Loss Position, Fair Value	[1]	2,661	3,181
Continuous Unrealized Loss Position, Unrealized Losses	[1]	(7)	(12)
GSE obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value			0
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses			0
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value			126
Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses			(1)
Continuous Unrealized Loss Position, Fair Value			126
Continuous Unrealized Loss Position, Unrealized Losses			(1)
State or local housing agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		53	354
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		0	(1)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		628	395
Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		(1)	(1)
Continuous Unrealized Loss Position, Fair Value		681	749
Continuous Unrealized Loss Position, Unrealized Losses		(1)	(2)
Non-mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		358	563
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		(1)	(1)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		2,984	3,493
Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		(7)	(14)
Continuous Unrealized Loss Position, Fair Value		3,342	4,056
Continuous Unrealized Loss Position, Unrealized Losses		(8)	(15)
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		659	4,381
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		0	(11)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		4,689	8,423
Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		(12)	(49)
Continuous Unrealized Loss Position, Fair Value		5,348	12,804
Continuous Unrealized Loss Position, Unrealized Losses		(12)	(60)
Multifamily [Member] | Mortgage-backed securities, GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		544	2,713
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		0	(6)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		3,293	6,315
Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		(10)	(35)
Continuous Unrealized Loss Position, Fair Value		3,837	9,028
Continuous Unrealized Loss Position, Unrealized Losses		(10)	(41)
Single Family [Member] | Other U.S. obligations MBS [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	[1]	0	1,123
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	[1]	0	(2)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	[1]	1,335	2,076
Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	[1]	(2)	(14)
Continuous Unrealized Loss Position, Fair Value	[1]	1,335	3,199
Continuous Unrealized Loss Position, Unrealized Losses	[1]	(2)	(16)
Single Family [Member] | Mortgage-backed securities, GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		115	545
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		0	(3)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		61	32
Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses		0	0
Continuous Unrealized Loss Position, Fair Value		176	577
Continuous Unrealized Loss Position, Unrealized Losses		$ 0	$ (3)
[1]	Represents investment securities backed by the full faith and credit of the U.S. Government.

Available-for-Sale Securities45

Available-for-Sale Securities (Contractual Maturity) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1]	$ 22,312	$ 22,983
Fair Value		22,403	22,969
Non-mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Contractual Maturities, Due in one year or less, Amortized Cost		227	133
Contractual Maturities, Due in one year or less, Fair Value		231	134
Contractual Maturities, Due after one year through five years, Amortized Cost		727	489
Contractual Maturities, Due after one year through five years, Fair Value		731	496
Contractual Maturities, Due after five years through ten years, Amortized Cost		3,858	4,452
Contractual Maturities, Due after five years through ten years, Fair Value		3,862	4,447
Contractual Maturities, Due after ten years, Amortized Cost		1,053	1,086
Contractual Maturities, Due after ten years, Fair Value		1,072	1,090
Amortized Cost	[1]	5,865	6,160
Fair Value		5,896	6,167
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[1]	16,447	16,823
Fair Value		$ 16,507	$ 16,802
[1]	Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, and/or fair value hedge accounting adjustments.

Held-to-Maturity Securities (Ma

Held-to-Maturity Securities (Major Security Types) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	$ 4,209	$ 4,674
Accumulated Unrecognized Holding Gain		75	65
Accumulated Unrecognized Holding Loss		(19)	(33)
Fair Value		4,265	4,706
GSE obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	395	397
Accumulated Unrecognized Holding Gain		66	60
Accumulated Unrecognized Holding Loss		0	(1)
Fair Value		461	456
State or local housing agency obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	655	688
Accumulated Unrecognized Holding Gain		2	1
Accumulated Unrecognized Holding Loss		(9)	(11)
Fair Value		648	678
Non-mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	1,050	1,085
Accumulated Unrecognized Holding Gain		68	61
Accumulated Unrecognized Holding Loss		(9)	(12)
Fair Value		1,109	1,134
Mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	3,159	3,589
Accumulated Unrecognized Holding Gain		7	4
Accumulated Unrecognized Holding Loss		(10)	(21)
Fair Value		3,156	3,572
Single Family [Member] | Other U.S. obligations MBS [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1],[2]	20	26
Accumulated Unrecognized Holding Gain	[2]	0	0
Accumulated Unrecognized Holding Loss	[2]	0	0
Fair Value	[2]	20	26
Single Family [Member] | Mortgage-backed securities, GSE [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	3,122	3,543
Accumulated Unrecognized Holding Gain		7	4
Accumulated Unrecognized Holding Loss		(10)	(20)
Fair Value		3,119	3,527
Commercial Mortgage Backed Securities [Member] | Other U.S. obligations MBS [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1],[2]	3	4
Accumulated Unrecognized Holding Gain	[2]	0	0
Accumulated Unrecognized Holding Loss	[2]	0	0
Fair Value	[2]	3	4
Residential Mortgage Backed Securities [Member] | Mortgage-backed securities, Private-label [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	14	16
Accumulated Unrecognized Holding Gain		0	0
Accumulated Unrecognized Holding Loss		0	(1)
Fair Value		$ 14	$ 15
[1]	Amortized cost includes adjustments made to the cost basis of an investment for accretion or amortization.
[2]	Represents investment securities backed by the full faith and credit of the U.S. Government.

Held-to-Maturity Securities (Un

Held-to-Maturity Securities (Unrealized Losses) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		$ 811	$ 2,299
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		(7)	(27)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		1,217	1,247
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(12)	(6)
Continuous Unrealized Loss Position, Fair Value		2,028	3,546
Continuous Unrealized Loss Position, Unrealized Losses		(19)	(33)
GSE obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value			73
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses			(1)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value			0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			0
Continuous Unrealized Loss Position, Fair Value			73
Continuous Unrealized Loss Position, Unrealized Losses			(1)
State or local housing agency obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		1	291
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		0	(11)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		268	10
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(9)	0
Continuous Unrealized Loss Position, Fair Value		269	301
Continuous Unrealized Loss Position, Unrealized Losses		(9)	(11)
Non-mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		1	364
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		0	(12)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		268	10
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(9)	0
Continuous Unrealized Loss Position, Fair Value		269	374
Continuous Unrealized Loss Position, Unrealized Losses		(9)	(12)
Mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		810	1,935
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		(7)	(15)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		949	1,237
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(3)	(6)
Continuous Unrealized Loss Position, Fair Value		1,759	3,172
Continuous Unrealized Loss Position, Unrealized Losses		(10)	(21)
Commercial Mortgage Backed Securities [Member] | Other U.S. obligations MBS [Member]
Schedule of Held-to-maturity Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	[1]	0	0
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	[1]	0	0
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	[1]	2	3
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[1]	0	0
Continuous Unrealized Loss Position, Fair Value	[1]	2	3
Continuous Unrealized Loss Position, Unrealized Losses	[1]	0	0
Single Family [Member] | Other U.S. obligations MBS [Member]
Schedule of Held-to-maturity Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	[1]	10	12
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	[1]	0	0
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	[1]	1	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	[1]	0	0
Continuous Unrealized Loss Position, Fair Value	[1]	11	12
Continuous Unrealized Loss Position, Unrealized Losses	[1]	0	0
Single Family [Member] | Mortgage-backed securities, GSE [Member]
Schedule of Held-to-maturity Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		800	1,918
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		(7)	(15)
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		937	1,224
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(3)	(5)
Continuous Unrealized Loss Position, Fair Value		1,737	3,142
Continuous Unrealized Loss Position, Unrealized Losses		(10)	(20)
Residential Mortgage Backed Securities [Member] | Mortgage-backed securities, Private-label [Member]
Schedule of Held-to-maturity Securities [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value		0	5
Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses		0	0
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value		9	10
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0	(1)
Continuous Unrealized Loss Position, Fair Value		9	15
Continuous Unrealized Loss Position, Unrealized Losses		$ 0	$ (1)
[1]	Represents investment securities backed by the full faith and credit of the U.S. Government.

Held-to-Maturity Securities (Co

Held-to-Maturity Securities (Contractual Maturity) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	$ 4,209	$ 4,674
Fair Value		4,265	4,706
Non-mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost		11	11
Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value		11	11
Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost		55	62
Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value		55	62
Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost		363	367
Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value		397	399
Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Amortized Cost		621	645
Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Fair Value		646	662
Amortized Cost	[1]	1,050	1,085
Fair Value		1,109	1,134
Mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	[1]	3,159	3,589
Fair Value		$ 3,156	$ 3,572
[1]	Amortized cost includes adjustments made to the cost basis of an investment for accretion or amortization.

Advances (Narrative) (Details)

Advances (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Federal Home Loan Bank, Advances [Line Items]
Advances	$ 118,878	$ 131,601
Federal Home Loan Bank, Advances, Par Value	118,838	131,537
Federal Home Loan Bank, Advances, Callable Option [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Par Value	45,500	78,500
Federal Home Loan Bank, Advances, Putable Option [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Par Value	1,300	1,900
Wells Fargo Bank N.A. [Member]
Federal Home Loan Bank, Advances [Line Items]
Advances	$ 62,500	$ 77,075
Federal Home Loan Bank Advances, Percent	53.00%	59.00%

Advances (Redemption Terms) (De

Advances (Redemption Terms) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Advances [Abstract]
Overdrawn demand deposit accounts	$ 3	$ 1
Weighted Average Interest Rate on Overdrawn Demand Deposit	4.31%	3.81%
Due in one year or less	$ 42,781	$ 22,532
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Next Twelve Rolling Months	1.45%	1.13%
Due after one year through two years	$ 19,797	$ 29,791
Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two	1.45%	1.12%
Due after two years through three years	$ 14,030	$ 30,023
Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three	1.48%	0.98%
Due after three years through four years	$ 21,118	$ 17,615
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four	1.41%	1.00%
Due after four years through five years	$ 8,707	$ 17,197
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Five	1.72%	1.11%
Thereafter	$ 12,402	$ 14,378
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Five	1.80%	1.11%
Federal Home Loan Bank, Advances, Par Value	$ 118,838	$ 131,537
Federal Home Loan Bank, Advances, Weighted Average Interest Rate	1.50%	1.07%
Premiums	$ 65	$ 83
Discounts	(5)	(7)
Fair value hedging adjustments	(20)	(12)
Total	118,878	131,601
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Next Rolling Twelve Months	79,669	93,471
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Next Rolling Twelve Months	43,130	23,532
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Two	17,712	9,978
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Two	19,640	28,983
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Three	9,390	15,515
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Three	14,030	30,023
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Four	2,841	2,734
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Four	20,980	17,615
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Five	6,906	7,670
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Five	8,674	17,026
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, after Rolling Year Five	2,317	2,168
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, after Rolling Year Five	$ 12,381	$ 14,357

Advances (Prepayment Fees) (Det

Advances (Prepayment Fees) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Advances [Abstract]
Prepayment fee income		$ 1	$ 2	$ 1	$ 9
Fair value hedging adjustments	[1]	0	(1)	0	(4)
Prepayment fees on advances, net		$ 1	$ 1	$ 1	$ 5
[1]	Represents the amortization/accretion of fair value hedging adjustments on closed advance hedge relationships resulting from advance prepayments.

Mortgage Loans Held for Portf52

Mortgage Loans Held for Portfolio (Mortgage Loans Held for Portfolio) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance		$ 6,861	$ 6,823
Premiums		96	96
Discounts		(7)	(9)
Basis adjustments from mortgage loan commitments		5	5
Total mortgage loans held for portfolio		6,955	6,915
Allowance for credit losses		(2)	(2)
Total mortgage loans held for portfolio, net		6,953	6,913
Single Family [Member] | Fixed rate, long-term single family mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance		5,787	5,669
Single Family [Member] | Fixed rate, medium-term single family mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	[1]	1,074	1,154
Mortgage Partnership Finance Program [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance		6,511	6,420
Premiums		85	82
Discounts		(7)	(8)
Basis adjustments from mortgage loan commitments		5	5
Total mortgage loans held for portfolio		6,594	6,499
Allowance for credit losses		(2)	2
Total mortgage loans held for portfolio, net		6,592	6,497
Mortgage Partnership Finance Program [Member] | Single Family [Member] | Fixed rate, long-term single family mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance		5,440	5,272
Mortgage Partnership Finance Program [Member] | Single Family [Member] | Fixed rate, medium-term single family mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	[1]	1,071	1,148
Mortgage Purchase Program [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance		350	403
Premiums		11	14
Discounts		0	(1)
Basis adjustments from mortgage loan commitments		0	0
Total mortgage loans held for portfolio		361	416
Allowance for credit losses		0	0
Total mortgage loans held for portfolio, net		361	416
Mortgage Purchase Program [Member] | Single Family [Member] | Fixed rate, long-term single family mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance		347	397
Mortgage Purchase Program [Member] | Single Family [Member] | Fixed rate, medium-term single family mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	[1]	$ 3	$ 6
[1]	Medium-term is defined as a term of 15 years or less.

Mortgage Loans Held for Portf53

Mortgage Loans Held for Portfolio (Mortgage Loans Held for Portfolio by Collateral or Guarantee Type) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 6,861	$ 6,823
Mortgage Partnership Finance Program [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	6,511	6,420
Mortgage Purchase Program [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	350	403
Conventional Mortgage Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	6,322	6,268
Conventional Mortgage Loan [Member] | Mortgage Partnership Finance Program [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	6,007	5,907
Conventional Mortgage Loan [Member] | Mortgage Purchase Program [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	315	361
Loans Insured or Guaranteed by US Government Authorities [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	539	555
Loans Insured or Guaranteed by US Government Authorities [Member] | Mortgage Partnership Finance Program [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	504	513
Loans Insured or Guaranteed by US Government Authorities [Member] | Mortgage Purchase Program [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 35	$ 42

Allowance for Credit Losses (Al

Allowance for Credit Losses (Allowance and Recorded Investment by Impairment Methodology) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Gross	[1]	$ 6,989	$ 6,949
Conventional Mortgage Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		2	2
Financing Receivable, Collectively Evaluated for Impairment	[2]	6,369	6,306
Financing Receivable, Individually Evaluated for Impairment	[2]	66	72
Financing Receivable, Gross	[2]	6,435	6,378
Mortgage Partnership Finance Program [Member] | Conventional Mortgage Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		2	2
Financing Receivable, Collectively Evaluated for Impairment	[2]	6,067	5,960
Financing Receivable, Individually Evaluated for Impairment	[2]	43	45
Financing Receivable, Gross	[1],[2]	6,110	6,005
Mortgage Purchase Program [Member] | Conventional Mortgage Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	[3]	0	0
Financing Receivable, Collectively Evaluated for Impairment	[2]	302	346
Financing Receivable, Individually Evaluated for Impairment	[2]	23	27
Financing Receivable, Gross	[1],[2]	$ 325	$ 373
[1]	Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs.
[2]	Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs.
[3]	The allowance for credit losses on MPP loans was less than $1 million at June 30, 2017 and December 31, 2016.

Allowance for Credit Losses (Cr

Allowance for Credit Losses (Credit Quality Indicators) (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		$ 142	$ 173
Total current loans		6,847	6,776
Total recorded investment	[1]	6,989	6,949
In process of foreclosure	[2]	$ 19	$ 25
Serious delinquency rate	[3]	1.00%	1.00%
Past due 90 days or more and still accruing interest	[4]	$ 10	$ 14
Non-accrual mortgage loans	[5]	50	60
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		75	83
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		21	31
Financing Receivables, 90 to 179 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		15	18
Financing Receivables, Greater than 180 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		31	41
Conventional Mortgage Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment	[6]	6,435	6,378
Mortgage Partnership Finance Program [Member] | Conventional Mortgage Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		82	98
Total current loans		6,028	5,907
Total recorded investment	[1],[6]	6,110	6,005
In process of foreclosure	[2]	$ 12	$ 16
Serious delinquency rate	[3]	0.00%	1.00%
Past due 90 days or more and still accruing interest	[4]	$ 0	$ 0
Non-accrual mortgage loans	[5]	29	36
Mortgage Partnership Finance Program [Member] | Conventional Mortgage Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		46	50
Mortgage Partnership Finance Program [Member] | Conventional Mortgage Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		12	17
Mortgage Partnership Finance Program [Member] | Conventional Mortgage Loan [Member] | Financing Receivables, 90 to 179 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		8	9
Mortgage Partnership Finance Program [Member] | Conventional Mortgage Loan [Member] | Financing Receivables, Greater than 180 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		16	22
Mortgage Partnership Finance Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		30	36
Total current loans		487	491
Total recorded investment	[1]	517	527
In process of foreclosure	[2]	$ 2	$ 2
Serious delinquency rate	[3]	2.00%	2.00%
Past due 90 days or more and still accruing interest	[4]	$ 9	$ 11
Non-accrual mortgage loans	[5]	0	0
Mortgage Partnership Finance Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		16	18
Mortgage Partnership Finance Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		5	7
Mortgage Partnership Finance Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | Financing Receivables, 90 to 179 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		4	6
Mortgage Partnership Finance Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | Financing Receivables, Greater than 180 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		5	5
Mortgage Purchase Program [Member] | Conventional Mortgage Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		25	30
Total current loans		300	343
Total recorded investment	[1],[6]	325	373
In process of foreclosure	[2]	$ 5	$ 7
Serious delinquency rate	[3]	4.00%	4.00%
Past due 90 days or more and still accruing interest	[4]	$ 0	$ 0
Non-accrual mortgage loans	[5]	21	24
Mortgage Purchase Program [Member] | Conventional Mortgage Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		9	11
Mortgage Purchase Program [Member] | Conventional Mortgage Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		4	5
Mortgage Purchase Program [Member] | Conventional Mortgage Loan [Member] | Financing Receivables, 90 to 179 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		3	2
Mortgage Purchase Program [Member] | Conventional Mortgage Loan [Member] | Financing Receivables, Greater than 180 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		9	12
Mortgage Purchase Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		5	9
Total current loans		32	35
Total recorded investment	[1]	37	44
In process of foreclosure	[2]	$ 0	$ 0
Serious delinquency rate	[3]	2.00%	7.00%
Past due 90 days or more and still accruing interest	[4]	$ 1	$ 3
Non-accrual mortgage loans	[5]	0	0
Mortgage Purchase Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		4	4
Mortgage Purchase Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		0	2
Mortgage Purchase Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | Financing Receivables, 90 to 179 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		0	1
Mortgage Purchase Program [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | Financing Receivables, Greater than 180 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due loans		$ 1	$ 2
[1]	Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs.
[2]	Includes loans where the decision of foreclosure or similar alternative such as pursuit of deed-in-lieu has been reported. Loans in process of foreclosure are included in past due or current loans depending on their payment status.
[3]	Represents mortgage loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total recorded investment.
[4]	Represents government-insured mortgage loans that are 90 days or more past due.
[5]	Represents conventional mortgage loans that are 90 days or more past due and TDRs.
[6]	Represents the unpaid principal balance adjusted for accrued interest, unamortized premiums, discounts, basis adjustments, and direct write-downs.

Allowance for Credit Losses (In

Allowance for Credit Losses (Individually Evaluated Impaired Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0	$ 0	$ 0	$ 0
Conventional Mortgage Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, Average Recorded Investment	68	61	69	63
Mortgage Partnership Finance Program [Member] | Conventional Mortgage Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	45	34	44	35
Mortgage Purchase Program [Member] | Conventional Mortgage Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	$ 23	$ 27	$ 25	$ 28

Derivatives and Hedging Activ57

Derivatives and Hedging Activities (Derivatives in Statement of Condition) (Details) - USD ($) $ in Millions		Jun. 30, 2017		Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		$ 52,289		$ 53,506
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		180		204
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		666		744
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[2]	(41)	[1]	(13)	[3]
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	(643)	[1]	(668)	[3]
Derivative assets, net		139		191
Derivative liabilities, net		23		76
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		264		658
Derivative Asset, Collateral, Obligation to Return Cash, Offset		0		2
Variation Margin for Daily Settled Contracts		339
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		50,686		51,896
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		162		183
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		611		688
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		1,603		1,610
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		18		21
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		55		56
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		1,380		1,414
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		18		20
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		55		56
Mortgage-backed securities [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		110		94
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0		1
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		0
Mortgages [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Derivatives		113		102
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		$ 0		$ 0
[1]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. In addition, the amount includes the fair value adjustments on derivatives for variation margin which is characterized as a daily settled contract
[2]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions, cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty, and includes fair value adjustments on derivatives for variation margin, which effective January 3, 2017, is characterized as a daily settled contract. Cash collateral posted by the Bank (including accrued interest) was $264 million and $658 million at June 30, 2017 and December 31, 2016. At June 30, 2017 the Bank did not receive cash collateral from clearing agents and/or counterparties. At December 31, 2016, the Bank received cash collateral from clearing agents and/or counterparties of $2 million. Variation margin for daily settled contracts was $339 million at June 30, 2017. Variation margin was considered cash collateral prior to January 3, 2017.
[3]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty.

Derivatives and Hedging Activ58

Derivatives and Hedging Activities (Derivatives in Statement of Income) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Designated as Hedging Instruments, Gain (Loss), Net		$ 6	$ (8)	$ 10	$ (9)
Derivatives Not Designated as Hedging Instruments, Gain (Loss), Net		(9)	(22)	(8)	(64)
Derivative Instruments, Other Gain (Loss)	[1]	0	0	1	0
Net gains (losses) on derivatives and hedging activities		(3)	(30)	3	(73)
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Designated as Hedging Instruments, Gain (Loss), Net		6	(8)	10	(9)
Derivatives Not Designated as Hedging Instruments, Gain (Loss), Net		(6)	(18)	(1)	(55)
Net Interest Settlements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments, Gain (Loss), Net		(3)	(4)	(7)	(9)
Mortgage-backed securities [Member] | Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments, Gain (Loss), Net		0	(2)	(1)	(3)
Mortgages [Member] | Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments, Gain (Loss), Net		$ 0	$ 2	$ 1	$ 3
[1]	Consists of price alignment amount on derivatives for variation margin which is characterized as a daily settled contract.

Derivatives and Hedging Activ59

Derivatives and Hedging Activities (Derivatives in Statement of Income and Impact on Interest) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on Derivatives	$ 6		$ (86)		$ 26		$ (430)
Net Fair Value Hedge Ineffectiveness	6		(8)		10		(9)
Effect on Net Interest Income	(38)	[1]	(55)	[1]	(72)	[2]	(118)	[2]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0		78		(16)		421
Amortization and Accretion of Off-Market Derivatives	4		8		9		16
Available-for-sale Securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on Derivatives	(41)		(128)		(4)		(404)
Net Fair Value Hedge Ineffectiveness	8		(8)		14		(3)
Effect on Net Interest Income	(24)	[1]	(36)	[1]	(53)	[2]	(74)	[2]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	49		120		18		401
Advances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on Derivatives	(25)	[3]	(42)	[3]	8	[4]	(178)	[4]
Net Fair Value Hedge Ineffectiveness	1	[3]	(1)	[3]	2	[4]	1	[4]
Effect on Net Interest Income	(21)	[1],[3]	(37)	[1],[3]	(45)	[2],[4]	(77)	[2],[4]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	26	[3]	41	[3]	(6)	[4]	179	[4]
Consolidated Obligation Bonds [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on Derivatives	72		84		22		152
Net Fair Value Hedge Ineffectiveness	(3)		1		(6)		(7)
Effect on Net Interest Income	7	[1]	18	[1]	26	[2]	33	[2]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (75)		$ (83)		$ (28)		$ (159)
[1]	Represents the net interest settlements on derivatives in fair value hedge relationships and the amortization of the financing element of off-market derivatives, both of which are included in the interest income or interest expense line item of the respective hedged item type. This amortization for off-market derivatives totaled $4 million and $8 million for the three months ended June 30, 2017 and 2016.
[2]	Represents the net interest settlements on derivatives in fair value hedge relationships and the amortization of the financing element of off-market derivatives, both of which are included in the interest income or interest expense line item of the respective hedged item type. This amortization for off-market derivatives totaled $9 million and $16 million for the six months ended June 30, 2017 and 2016.
[3]	Includes net gains (losses) on fair value hedge firm commitments of forward starting advances.
[4]	Includes net gains (losses) on fair value hedge firm commitments of forward starting advances.

Derivatives and Hedging Activ60

Derivatives and Hedging Activities (Credit Risk Exposure) (Details) $ in Millions	Jun. 30, 2017USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, Net Liability Position, Aggregate Fair Value	$ 145
Collateral Already Posted, Aggregate Fair Value	133
Additional Collateral, Aggregate Fair Value	$ 4

Derivatives and Hedging Activ61

Derivatives and Hedging Activities (Offsetting of Derivative Assets and Derivative Liabilities) (Details) - USD ($) $ in Millions		Jun. 30, 2017		Dec. 31, 2016
Offsetting Assets and Liabilities [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 180		$ 204
Derivative Liability, Fair Value, Gross Liability		666		744
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[2]	(41)	[1]	(13)	[3]
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	(643)	[1]	(668)	[3]
Derivative Asset, Net Fair Value Amount, After Offsetting Adjustment		139		191
Derivative Liability, Net Fair Value Amount, After Offsetting Adjustment		23		76
Derivative assets, net		139		191
Derivative liabilities, net		23		76
Over the Counter [Member]
Offsetting Assets and Liabilities [Line Items]
Derivative Asset, Fair Value, Gross Asset		79		97
Derivative Liability, Fair Value, Gross Liability		223		263
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(68)		(95)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(200)		(187)
Derivative Asset, Net Fair Value Amount, After Offsetting Adjustment		11		2
Derivative Liability, Net Fair Value Amount, After Offsetting Adjustment		23		76
Exchange Cleared [Member]
Offsetting Assets and Liabilities [Line Items]
Derivative Asset, Fair Value, Gross Asset		101		107
Derivative Liability, Fair Value, Gross Liability		443		481
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(27)		(82)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(443)		(481)
Derivative Asset, Net Fair Value Amount, After Offsetting Adjustment		128		189
Derivative Liability, Net Fair Value Amount, After Offsetting Adjustment		$ 0		$ 0
[1]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. In addition, the amount includes the fair value adjustments on derivatives for variation margin which is characterized as a daily settled contract
[2]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions, cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty, and includes fair value adjustments on derivatives for variation margin, which effective January 3, 2017, is characterized as a daily settled contract. Cash collateral posted by the Bank (including accrued interest) was $264 million and $658 million at June 30, 2017 and December 31, 2016. At June 30, 2017 the Bank did not receive cash collateral from clearing agents and/or counterparties. At December 31, 2016, the Bank received cash collateral from clearing agents and/or counterparties of $2 million. Variation margin for daily settled contracts was $339 million at June 30, 2017. Variation margin was considered cash collateral prior to January 3, 2017.
[3]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty.

Consolidated Obligations Narrat

Consolidated Obligations Narrative (Details) - USD ($) $ in Billions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Short-term and Long-term Debt [Line Items]
Obligation with Joint and Several Liability Arrangement, Amount Outstanding	$ 855.5	$ 818.2
FHLBanks [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Obligation with Joint and Several Liability Arrangement, Amount Outstanding	$ 1,011.5	$ 989.3

Consolidated Obligations Discou

Consolidated Obligations Discount Notes (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Total		$ 66,558	$ 80,947
Consolidated Obligation Discount Notes [Member]
Short-term Debt [Line Items]
Par value		$ 66,668	$ 81,019
Par Value, Weighted Average Interest Rate		0.91%	0.49%
Discounts and concessions	[1]	$ (110)	$ (72)
[1]	Concessions represent fees paid to dealers in connections with the issuance of certain consolidated obligation discount notes.

Consolidated Obligations Bonds

Consolidated Obligations Bonds (Details) - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total		$ 89,171	$ 89,898
Consolidated Obligation Bonds [Member]
Debt Instrument [Line Items]
Due in one year or less		$ 48,266	$ 47,733
Due in one year or less, Weighted Average Interest Rate		1.05%	0.88%
Due after one year through two years, Weighted Average Interest Rate		1.28%	0.94%
Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two		$ 17,427	$ 13,135
Due after two years through three years		$ 10,047	$ 15,414
Due after two years through three years, Weighted Average Interest Rate		1.73%	1.48%
Due after three years through four years		$ 2,015	$ 2,288
Due after three years through four years, Weighted Average Interest Rate		2.71%	3.28%
Due after four years through five years		$ 6,799	$ 7,152
Due after four years through five years, Weighted Average Interest Rate		1.67%	1.66%
Thereafter		$ 4,768	$ 4,331
Thereafter, Weighted Average Interest Rate		3.03%	3.04%
Total par value		$ 89,322	$ 90,053
Total par value, Weighted Average Interest Rate		1.36%	1.22%
Premiums		$ 224	$ 254
Discounts and concessions	[1]	(69)	(79)
Fair value hedging adjustments		(306)	(330)
Total		$ 89,171	$ 89,898
[1]	Concessions represent fees paid to dealers in connections with the issuance of certain consolidated obligation bonds.

Consolidated Obligations Bond65

Consolidated Obligations Bonds by Call Features (Details) - Consolidated Obligation Bonds [Member] - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total par value	$ 89,322	$ 90,053
Noncallable or Nonputable [Member]
Debt Instrument [Line Items]
Total par value	86,408	87,804
Callable [Member]
Debt Instrument [Line Items]
Total par value	$ 2,914	$ 2,249

Capital (Narrative) (Details)

Capital (Narrative) (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016		Mar. 31, 2016	Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value	$ 18,000,000		$ 1,000,000	$ 28,000,000		$ 731,000,000
Financial Instruments Subject To Mandatory Redemption Repurchases	32,000,000		35,000,000	212,000,000		136,000,000
Excess Capital	$ 0			$ 0				$ 0
Common Stock, Par or Stated Value Per Share	$ 100			$ 100				$ 100
Number of Subclasses of Capital Stock	2			2
Number of Finance Agency Regulatory Capital Requirements	3			3
Weight Applied to Permanent Capital in Computing Leverage Ratio	1.5			1.5
Weight Applied to Nonpermanent Capital in Computing Leverage Ratio	1			1
Minimum Capital Stock Required to be Held by Members as a Percent of Total Assets at Preceeding Fiscal Year End, Subject to Cap and Floor	0.12%			0.12%
Activity Based Capital Stock Required by Members as a Percent of Total Advances and Mortgage Loans Oustanding as Disclosed in the Statement of Condition	4.00%			4.00%
Redemption Period Under FHLBank Capital Plan				5 years
Mandatorily redeemable capital stock	$ 480,000,000	[1]	698,000,000	$ 480,000,000	[1]	698,000,000	$ 494,000,000	$ 664,000,000	[1]	$ 732,000,000	$ 103,000,000
Additional capital from merger	$ 0			0				52,000,000
Dividends, Common Stock, Cash				$ (88,000,000)		(66,000,000)
Quarterly Net Income Allocated to Restricted Retained Earnings	20.00%			20.00%
Percent of Average Balance of Outstanding Consolidated Obligations Prescribed per the Joint Capital Enhancement Agreement For Each Previous Quarter				1.00%
Restricted Retained Earnings	$ 285,000,000			$ 285,000,000				$ 231,000,000
Interest Expense, Capital Securities	4,000,000		$ 5,000,000	$ 9,000,000		9,000,000
Written Notice Period Required to Repurchase Excess Membership Capital Stock				15 days
Maximum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Federal Home Loan Banks, Membership Requirements, Capital Stock	10,000,000			$ 10,000,000
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Federal Home Loan Banks, Membership Requirements, Capital Stock	$ 10,000			10,000
Additional Capital from Merger [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends, Common Stock, Cash				(52,000,000)		$ (66,000,000)
Captive Insurance Companies [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value				723,000,000
Financial Instruments Subject To Mandatory Redemption Repurchases				$ 148,000,000
[1]	At the Bank's election, the mandatorily redeemable capital stock may be redeemed prior to the expiration of the five year redemption period that commences on the date of the notice of redemption, or in the case of captive insurance company members, on the date of the membership termination.

Capital (Rollforward of MRCS) (

Capital (Rollforward of MRCS) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
MRCS [Abstract]
Beginning Balance	$ 494		$ 732	$ 664	[1]	$ 103
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value	18		1	28		731
Financial Instruments Subject To Mandatory Redemption Repurchases	(32)		(35)	(212)		(136)
Ending Balance	$ 480	[1]	$ 698	$ 480	[1]	$ 698
[1]	At the Bank's election, the mandatorily redeemable capital stock may be redeemed prior to the expiration of the five year redemption period that commences on the date of the notice of redemption, or in the case of captive insurance company members, on the date of the membership termination.

Capital (Mandatorily Redeemable

Capital (Mandatorily Redeemable Capital Stock) (Details) - USD ($) $ in Millions		Jun. 30, 2017		Mar. 31, 2017	Dec. 31, 2016		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
MRCS [Abstract]
Financial Instruments Subject to Mandatory Redemption, Redeemable within One year	[1]	$ 4			$ 4
Financial Instruments Subject to Mandatory Redemption, Redeemable in Year Two	[1]	0			5
Financial Instruments Subject to Mandatory Redemption, Redeemable in Year Three	[1]	4			4
Financial Instruments Subject to Mandatory Redemption, Redeemable in Year Four	[1]	1			0
Financial Instruments Subject to Mandatory Redemption, Redeemable in Year Five	[1]	21			1
Financial Instruments Subject to Mandatory Redemption, Redeemable After Year Five	[1],[2]	433			631
Financial Instruments Subject to Mandatory Redemption, Past Contractual Redemption Date, Due to Outstanding Activity	[1]	17			19
Mandatorily redeemable capital stock		$ 480	[1]	$ 494	$ 664	[1]	$ 698	$ 732	$ 103
[1]	At the Bank's election, the mandatorily redeemable capital stock may be redeemed prior to the expiration of the five year redemption period that commences on the date of the notice of redemption, or in the case of captive insurance company members, on the date of the membership termination.
[2]	Represents mandatorily redeemable capital stock resulting from the Finance Agency rule previously discussed that makes captive insurance companies ineligible for FHLBank membership. The related mandatorily redeemable capital stock is not required to be redeemed until five years after the member's termination.

Capital (Accumulated Other Comp

Capital (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ (18)
Other comprehensive income (loss) before reclassifications, Net unrealized losses	$ 41	$ 36	105	$ (1)
Total other comprehensive income (loss)	42	37	107	(1)
Ending Balance	89		89
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	50	(119)	(14)	(82)
Other comprehensive income (loss) before reclassifications, Net unrealized losses	41	36	105	(1)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	0	0	0
Total other comprehensive income (loss)	41	36	105	(1)
Ending Balance	91	(83)	91	(83)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(3)	(3)	(4)	(2)
Other comprehensive income (loss) before reclassifications, Net unrealized losses	0	0	0	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	1	1	2
Total other comprehensive income (loss)	1	1	2	0
Ending Balance	(2)	(2)	(2)	(2)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	47	(122)	(18)	(84)
Other comprehensive income (loss) before reclassifications, Net unrealized losses	41	36	105	(1)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	1	1	2
Total other comprehensive income (loss)	42	37	107	(1)
Ending Balance	$ 89	$ (85)	$ 89	$ (85)

Capital (Regulatory Capital Req

Capital (Regulatory Capital Requirements) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Capital [Abstract]
Federal Home Loan Bank, Risk-Based Capital, Required	$ 940	$ 1,046
Federal Home Loan Bank, Risk-Based Capital, Actual	7,787	8,031
Federal Home Loan Bank, Regulatory Capital, Required	6,600	7,224
Federal Home Loan Bank, Regulatory Capital, Actual	7,787	8,083
Federal Home Loan Bank, Leverage Capital, Required	8,249	9,030
Federal Home Loan Bank, Leverage Capital, Actual	$ 11,681	$ 12,098
Regulatory Capital Ratio, Required	4.00%	4.00%
Federal Home Loan Bank, Regulatory Capital Ratio, Actual	4.72%	4.48%
Leverage Ratio, Required	5.00%	5.00%
Federal Home Loan Bank, Leverage Ratio, Actual	7.08%	6.70%

Fair Value (Carrying Value and

Fair Value (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions		Jun. 30, 2017		Mar. 31, 2017	Dec. 31, 2016		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks		$ 964			$ 223
Trading securities		2,549			2,553
Available-for-sale securities		22,403			22,969
Held-to-maturity securities		4,209			4,674
Held-to-Maturity Securities, Fair Value		4,265			4,706
Loans to Other Federal Home Loan Banks		0			200
Accrued interest receivable		206			197
Derivative assets, net		139			191
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[2]	(41)	[1]		(13)	[3]
Liabilities
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	643	[1]		668	[3]
Mandatorily redeemable capital stock		(480)	[4]	$ (494)	(664)	[4]	$ (698)	$ (732)	$ (103)
Accrued interest payable		(209)			(180)
Derivative liabilities, net		(23)			(76)
Reported Value Measurement [Member]
Assets
Cash and due from banks		964			223
Interest-bearing deposits		2			2
Securities purchased under agreements to resell		3,500			5,925
Federal funds sold		5,100			5,095
Trading securities		2,549			2,553
Available-for-sale securities		22,403			22,969
Held-to-maturity securities		4,209			4,674
Advances		118,878			131,601
Mortgage loans held for portfolio, net		6,953			6,913
Loans to Other Federal Home Loan Banks					200
Accrued interest receivable		206			197
Derivative assets, net		139			191
Other assets		26			24
Liabilities
Deposits		(964)			(1,113)
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure		(155,729)			(170,845)
Mandatorily redeemable capital stock		(480)			(664)
Accrued interest payable		(209)			(180)
Derivative liabilities, net		(23)			(76)
Fair Value [Member]
Assets
Cash and due from banks		964			223
Interest-bearing deposits		2			2
Securities purchased under agreements to resell		3,500			5,925
Federal funds sold		5,100			5,095
Trading securities		2,549			2,553
Available-for-sale securities		22,403			22,969
Held-to-Maturity Securities, Fair Value		4,265			4,706
Advances		119,119			131,772
Mortgage loans held for portfolio, net		7,050			6,989
Loans to Other Federal Home Loan Banks					200
Accrued interest receivable		206			197
Derivative assets, net		139			191
Other assets		26			24
Liabilities
Deposits		(964)			(1,113)
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure		(156,186)			(171,313)
Mandatorily redeemable capital stock		(480)			(664)
Accrued interest payable		(209)			(180)
Derivative liabilities, net		(23)			(76)
Fair Value, Level 1 [Member]
Assets
Cash and due from banks		964			223
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 securities		0			0
Held-to-Maturity Securities, Fair Value		0			0
Advances		0			0
Mortgage loans held for portfolio, net		0			0
Loans to Other Federal Home Loan Banks					0
Accrued interest receivable		0			0
Derivative assets, net		0			0
Other assets		26			24
Liabilities
Deposits		0			0
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure		0			0
Mandatorily redeemable capital stock		(480)			(664)
Accrued interest payable		0			0
Derivative liabilities, net		0			0
Fair Value, Level 2 [Member]
Assets
Cash and due from banks		0			0
Interest-bearing deposits		2			2
Securities purchased under agreements to resell		3,500			5,925
Federal funds sold		5,100			5,095
Trading securities		2,549			2,553
Available-for-sale securities		22,403			22,969
Held-to-Maturity Securities, Fair Value		4,251			4,691
Advances		119,119			131,772
Mortgage loans held for portfolio, net		6,981			6,918
Loans to Other Federal Home Loan Banks					200
Accrued interest receivable		206			197
Derivative assets, net		180			204
Other assets		0			0
Liabilities
Deposits		(964)			(1,113)
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure		(156,186)			(171,313)
Mandatorily redeemable capital stock		0			0
Accrued interest payable		(209)			(180)
Derivative liabilities, net		(666)			(744)
Fair Value, Level 3 [Member]
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 securities		0			0
Held-to-Maturity Securities, Fair Value		14			15
Advances		0			0
Mortgage loans held for portfolio, net		69			71
Loans to Other Federal Home Loan Banks					0
Accrued interest receivable		0			0
Derivative assets, net		0			0
Other assets		0			0
Liabilities
Deposits		0			0
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure		0			0
Mandatorily redeemable capital stock		0			0
Accrued interest payable		0			0
Derivative liabilities, net		0			0
Consolidated Obligation Discount Notes [Member] | Reported Value Measurement [Member]
Liabilities
Discount notes		(66,558)			(80,947)
Consolidated Obligation Discount Notes [Member] | Fair Value [Member]
Liabilities
Discount notes		(66,550)			(80,943)
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 1 [Member]
Liabilities
Discount notes		0			0
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 2 [Member]
Liabilities
Discount notes		(66,550)			(80,943)
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 3 [Member]
Liabilities
Discount notes		0			0
Consolidated Obligation Bonds [Member]
Liabilities
Bonds, Fair Value		0			0
Consolidated Obligation Bonds [Member] | Reported Value Measurement [Member]
Liabilities
Bonds, Fair Value		(89,171)			(89,898)
Consolidated Obligation Bonds [Member] | Fair Value [Member]
Liabilities
Bonds, Fair Value		(89,636)			(90,370)
Consolidated Obligation Bonds [Member] | Fair Value, Level 1 [Member]
Liabilities
Bonds, Fair Value		0			0
Consolidated Obligation Bonds [Member] | Fair Value, Level 2 [Member]
Liabilities
Bonds, Fair Value		(89,636)			(90,370)
Consolidated Obligation Bonds [Member] | Fair Value, Level 3 [Member]
Liabilities
Bonds, Fair Value		$ 0			$ 0
[1]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. In addition, the amount includes the fair value adjustments on derivatives for variation margin which is characterized as a daily settled contract
[2]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions, cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty, and includes fair value adjustments on derivatives for variation margin, which effective January 3, 2017, is characterized as a daily settled contract. Cash collateral posted by the Bank (including accrued interest) was $264 million and $658 million at June 30, 2017 and December 31, 2016. At June 30, 2017 the Bank did not receive cash collateral from clearing agents and/or counterparties. At December 31, 2016, the Bank received cash collateral from clearing agents and/or counterparties of $2 million. Variation margin for daily settled contracts was $339 million at June 30, 2017. Variation margin was considered cash collateral prior to January 3, 2017.
[3]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty.
[4]	At the Bank's election, the mandatorily redeemable capital stock may be redeemed prior to the expiration of the five year redemption period that commences on the date of the notice of redemption, or in the case of captive insurance company members, on the date of the membership termination.

Fair Value (Fair Value on a Rec

Fair Value (Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 30, 2017		Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		$ 2,549		$ 2,553
Available-for-sale securities		22,403		22,969
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[2]	(41)	[1]	(13)	[3]
Derivative assets, net		139		191
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	643	[1]	668	[3]
Derivative liabilities, net		(23)		(76)
Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Derivative assets, net		0		0
Other assets		26		24
Derivative liabilities, net		0		0
Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		2,549		2,553
Available-for-sale securities		22,403		22,969
Derivative assets, net		180		204
Other assets		0		0
Derivative liabilities, net		(666)		(744)
Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Derivative assets, net		0		0
Other assets		0		0
Derivative liabilities, net		0		0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(41)	[4]	(13)	[5]
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		643	[4]	668	[5]
Fair Value, Measurements, Recurring [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Other assets		26		24
Total recurring assets		26		24
Total recurring liabilities		0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		2,549		2,553
Available-for-sale securities		22,403		22,969
Other assets		0		0
Total recurring assets		25,132		25,726
Total recurring liabilities		(666)		(744)
Fair Value, Measurements, Recurring [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Other assets		0		0
Total recurring assets		0		0
Total recurring liabilities		0		0
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(41)	[4]	(13)	[5]
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		643	[4]	668	[5]
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 1 [Member]
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 Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		180		204
Derivative liabilities, net		(666)		(744)
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		0		0
Derivative liabilities, net		0		0
Other U.S. obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	[6]	207		216
Available-for-sale securities	[7]	3,323		3,529
Other U.S. obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Other U.S. obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		207		216
Available-for-sale securities		3,323		3,529
Other U.S. obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
GSE obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,612		1,611
Available-for-sale securities		1,304		1,351
GSE obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
GSE obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,612		1,611
Available-for-sale securities		1,304		1,351
GSE obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
State or local housing agency obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		988		1,009
State or local housing agency obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
State or local housing agency obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		988		1,009
State or local housing agency obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Other non-MBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	[8]	275		273
Available-for-sale securities	[9]	281		278
Other non-MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Other non-MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		275		273
Available-for-sale securities		281		278
Other non-MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		2,549		2,553
Available-for-sale securities		22,403		22,969
Derivative assets, net		139		191
Other assets		26		24
Derivative liabilities, net		(23)		(76)
Fair Value [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		2,549		2,553
Available-for-sale securities		22,403		22,969
Other assets		26		24
Total recurring assets		25,117		25,737
Total recurring liabilities		(23)		(76)
Fair Value [Member] | Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets, net		139		191
Derivative liabilities, net		(23)		(76)
Fair Value [Member] | Other U.S. obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		207		216
Available-for-sale securities		3,323		3,529
Fair Value [Member] | GSE obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		1,612		1,611
Available-for-sale securities		1,304		1,351
Fair Value [Member] | State or local housing agency obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		988		1,009
Fair Value [Member] | Other non-MBS [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		275		273
Available-for-sale securities		281		278
Single Family [Member] | Other U.S. obligations MBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	[7]	3,946		3,838
Single Family [Member] | Other U.S. obligations MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Single Family [Member] | Other U.S. obligations MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		3,946		3,838
Single Family [Member] | Other U.S. obligations MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Single Family [Member] | GSE MBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,125		1,261
Single Family [Member] | GSE MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Single Family [Member] | GSE MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,125		1,261
Single Family [Member] | GSE MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0		0
Single Family [Member] | Fair Value [Member] | Other U.S. obligations MBS [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		3,946		3,838
Single Family [Member] | Fair Value [Member] | GSE MBS [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		1,125		1,261
Multifamily [Member] | GSE MBS [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		455		453
Available-for-sale securities		11,436		11,703
Multifamily [Member] | GSE MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Multifamily [Member] | GSE MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		455		453
Available-for-sale securities		11,436		11,703
Multifamily [Member] | GSE MBS [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		0		0
Available-for-sale securities		0		0
Multifamily [Member] | Fair Value [Member] | GSE MBS [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities		455		453
Available-for-sale securities		11,436		11,703
Consolidated Obligation Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds, Fair Value		0		0
Consolidated Obligation Bonds [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds, Fair Value		0		0
Consolidated Obligation Bonds [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds, Fair Value		(89,636)		(90,370)
Consolidated Obligation Bonds [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds, Fair Value		0		0
Consolidated Obligation Bonds [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bonds, Fair Value		(89,636)		(90,370)
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes		0		0
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes		(66,550)		(80,943)
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes		0		0
Consolidated Obligation Discount Notes [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount notes		$ (66,550)		$ (80,943)
[1]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. In addition, the amount includes the fair value adjustments on derivatives for variation margin which is characterized as a daily settled contract
[2]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions, cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty, and includes fair value adjustments on derivatives for variation margin, which effective January 3, 2017, is characterized as a daily settled contract. Cash collateral posted by the Bank (including accrued interest) was $264 million and $658 million at June 30, 2017 and December 31, 2016. At June 30, 2017 the Bank did not receive cash collateral from clearing agents and/or counterparties. At December 31, 2016, the Bank received cash collateral from clearing agents and/or counterparties of $2 million. Variation margin for daily settled contracts was $339 million at June 30, 2017. Variation margin was considered cash collateral prior to January 3, 2017.
[3]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty.
[4]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty. In addition, the amount includes the fair value adjustments on derivatives for variation margin which is characterized as a daily settled contract.
[5]	Amounts represent the application of the netting requirements that allow the Bank to net settle positive and negative positions and also cash collateral and the related accrued interest held or placed with the same clearing agent and/or counterparty.
[6]	Represents investment securities backed by the full faith and credit of the U.S. Government.
[7]	Represents investment securities backed by the full faith and credit of the U.S. Government.
[8]	Consists of taxable municipal bonds.
[9]	Consists of taxable municipal bonds and/or Private Export Funding Corporation (PEFCO) bonds.

Fair Value (Fair Value on a Non

Fair Value (Fair Value on a Non-Recurring Basis) (Details) - Fair Value, Level 3 [Member] - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired mortgage loans held for portfolio	$ 69	$ 71
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired mortgage loans held for portfolio	$ 6	$ 15

Commitments and Contingencies74

Commitments and Contingencies (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)Institutions	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Institutions	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Loss Contingencies [Line Items]
Obligation with Joint and Several Liability Arrangement, Amount Outstanding	$ 855,500		$ 855,500		$ 818,200
Other liabilities	54		54		210
FLA Balance For All Master Commitments	103		103		99
Gain (Loss) Related to Litigation Settlement	0	$ 200	21	$ 337
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	7,487		7,487
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	156		156
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	7,643		7,643		7,281
Other liabilities	4		$ 4		3
Original Expiration Periods No Later Than			2,025
Standby Letters of Credit [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Standby Letters Of Credit Original Terms			1 month
Standby Letters of Credit [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Standby Letters Of Credit Original Terms			13 years
Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	124		$ 124
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	575		575
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 699		$ 699		458
Original Expiration Periods No Later Than			2,024
Original Expiration Periods Up To			7 years
Number of Housing Authorities For Which the Bank Has Standby Bond Purchase Agreements | Institutions	7		7
Fees Generated From Guarantees Related to Standby Bond Purchase Agreements	$ 0	$ 0	$ 1	$ 1
Commitments to Issue Bonds [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	360		360		0
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	0		0
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	360		360		0
Commitments to Issue Discount Notes [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	15		15
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	0		0
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	15		15		0
Loan Origination Commitments [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	1,032		1,032
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	28		28
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	1,060		1,060		280
Mortgages [Member] | Forward Contracts [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	113		113
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	0		0
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	$ 113		$ 113		$ 102
Period of Delivery Commitments			45 days

Activities with Stockholders 75

Activities with Stockholders (Transactions with Directors' Financial Institutions) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Advances	$ 118,878	$ 131,601
Mortgage Loans	6,955	6,915
Deposits, Domestic	964	1,113
Capital Stock	5,623	5,917
Director [Member]
Related Party Transaction [Line Items]
Advances	$ 5,386	$ 2,497
Advances, Percent	5.00%	2.00%
Mortgage Loans	$ 57	$ 186
Mortgage Loans, Percent	1.00%	3.00%
Deposits, Domestic	$ 23	$ 82
Deposits, Percent	2.00%	7.00%
Capital Stock	$ 270	$ 157
Capital Stock, Percent	4.00%	2.00%

Activities with Stockholders (B

Activities with Stockholders (Business Concentrations) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Advances	$ 118,878			$ 118,878			$ 131,601
Mortgage Loans	6,955			6,955			6,915
Interest Income on Advances	380		$ 188	713		$ 357
Wells Fargo Bank N.A. [Member]
Related Party Transaction [Line Items]
Capital Stock	$ 2,510			$ 2,510			$ 3,093
Capital Stock Percentage	41.00%	[1]		41.00%	[1]		47.00%	[2]
Advances	$ 62,500			$ 62,500			$ 77,075
Mortgage Loans	0			0			0
Interest Income on Advances				390	[3]		429	[4]
Superior Guaranty Insurance Company [Member]
Related Party Transaction [Line Items]
Capital Stock	$ 25	[5]		$ 25	[5]		$ 28	[6]
Capital Stock Percentage	0.00%	[1],[5]		0.00%	[1],[5]		1.00%	[2],[6]
Advances	$ 0	[5]		$ 0	[5]		$ 0	[6]
Mortgage Loans	596	[5]		596	[5]		683	[6]
Interest Income on Advances				0	[3],[5]		0	[4],[6]
Wells Fargo Northwest NA [Member] [Member]
Related Party Transaction [Line Items]
Capital Stock	$ 1	[5]		$ 1	[5]		$ 2	[6]
Capital Stock Percentage	0.00%	[1],[5]		0.00%	[1],[5]		0.00%	[2],[6]
Advances	$ 0	[5]		$ 0	[5]		$ 0	[6]
Mortgage Loans	33	[5]		33	[5]		38	[6]
Interest Income on Advances				0	[3],[5]		0	[4],[6]
Principal Owner [Member]
Related Party Transaction [Line Items]
Capital Stock	$ 2,536			$ 2,536			$ 3,123
Capital Stock Percentage	41.00%	[1]		41.00%	[1]		48.00%	[2]
Advances	$ 62,500			$ 62,500			$ 77,075
Mortgage Loans	$ 629			629			721
Interest Income on Advances				$ 390	[3]		$ 429	[4]
Stockholders' Equity, Total [Member] | Stockholders' Capital Stock Outstanding Concenetration Risk [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Business Concentration Percentage				10.00%
[1]	Pursuant to applicable Finance Agency regulations, the Bank's voting structure limits the voting rights of these stockholders and other members holding a significant amount of the Bank's capital stock.
[2]	Pursuant to applicable Finance Agency regulations, the Bank's voting structure limits the voting rights of these stockholders and other members holding a significant amount of the Bank's capital stock.
[3]	Represents interest income earned on advances during the six months ended June 30, 2017. Interest income on mortgage loans is excluded from this table as this interest relates to the borrower, not to the stockholder.
[4]	Represents interest income earned on advances during the year ended December 31, 2016. Interest income on mortgage loans is excluded from this table as this interest relates to the borrower, not to the stockholder.
[5]	Superior Guaranty Insurance Company and Wells Fargo Bank Northwest, N.A. are affiliates of Wells Fargo Bank, N.A.
[6]	Superior Guaranty Insurance Company and Wells Fargo Bank Northwest, N.A. are affiliates of Wells Fargo Bank, N.A.

Activities with Other FHLBank77

Activities with Other FHLBanks (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Schedule of Other Transactions [Line Items]
Payments for Federal Home Loan Bank Advances	$ 130,163	$ 117,776
Proceeds from Federal Home Loan Bank Loans	(200)	0
Loans to Other Federal Home Loan Banks	0		$ 200
Federal Home Loan Bank, Advances, Premium	65		83
Federal Home Loan Bank of San Francisco [Member]
Schedule of Other Transactions [Line Items]
Loans from Other Federal Home Loan Banks		0		$ 0
Payments for Federal Home Loan Bank Advances	0
Proceeds from Federal Home Loan Bank Loans	(200)
Loans to Other Federal Home Loan Banks	0		$ 200
Proceeds from Federal Home Loan Bank Borrowings		200
Repayments of Federal Home Loan Bank Borrowings		$ (200)
Federal Home Loan Bank of Chicago [Member]
Schedule of Other Transactions [Line Items]
Payments for Federal Home Loan Bank Advances	37
Federal Home Loan Bank, Advances, Premium	$ 1