Federal Home Loan Bank of Chicago 10-Q 6 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Entity Information [Line Items]	'	'
Entity Registrant Name	'Federal Home Loan Bank of Chicago	'
Entity Central Index Key	'0001331451	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	18,089,639
Entity Well-known Seasoned Issuer	'No	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'

Statements_of_Condition

Statements of Condition (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets	'	'
Cash and due from banks	$8,413	$971
Interest bearing deposits	560	0
Federal Funds sold	1,783	500
Securities purchased under agreements to resell	0	4,550
Investment securities -	'	'
Trading, $58 and $32 pledged	822	1,899
Available-for-sale	20,379	21,536
Held-to-maturity, $7,403 and $8,618 fair value	6,685	7,917
Total investment securities	27,886	31,352
Advances, $73 and $30 carried at fair value	26,766	23,489
MPF Loans held in portfolio, net of allowance for credit losses of $(16) and $(29)	6,422	7,695
Accrued interest receivable	81	93
Derivative assets	30	35
Software and equipment, net of accumulated amortization/depreciation of $(165) and $(157)	33	33
Other assets	57	79
Total assets	72,031	68,797
Liabilities	'	'
Deposits	530	544
Consolidated obligations, net -	'	'
Discount notes, $1,531 and $75 carried at fair value	30,507	31,089
Bonds, $3,213 and $1,021 carried at fair value	35,239	31,987
Total consolidated obligations, net	65,746	63,076
Accrued interest payable	200	137
Mandatorily redeemable capital stock	5	5
Derivative liabilities	54	108
Affordable Housing Program assessment payable	83	78
Other liabilities	125	140
Subordinated notes	944	944
Total liabilities	67,687	65,032
Commitments and contingencies - see notes to the financial statements	'	'
Capital	'	'
Class B1 - putable $100 par value - 7 million and 7 million shares issued and outstanding	703	629
Class B2 - putable $100 par value - 11 million and 10 million shares issued and outstanding	1,098	1,041
Total Capital stock	1,801	1,670
Retained earnings - unrestricted	2,072	1,853
Retained earnings - restricted	232	175
Total retained earnings	2,304	2,028
Accumulated other comprehensive income (loss) (AOCI)	239	67
Total capital	4,344	3,765
Total liabilities and capital	$72,031	$68,797

Statements_of_Condition_Parent

Statements of Condition (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, except Per Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Trading securities pledged	$58	$32
Held-to-Maturity Fair Value	7,403	8,618
Advances carried at fair value	73	30
Allowance for credit losses on MPF Loans	-16	-29
Software and equipment, accumulated amortization and depreciation	-165	-157
Discount notes carried at fair value	1,531	75
Consolidated obligation bonds carried at fair value	$3,213	$1,021
Capital stock par value	$100	$100
Class B1 shares issued	7	7
Class B1 shares outstanding	7	7
Class B2 shares issued	11	10
Class B2 shares outstanding	11	10

Statements_of_Income

Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]	'	'	'	'
Interest income	$333	$373	$1,033	$1,156
Interest expense	195	254	649	826
Net interest income before provision for credit losses	138	119	384	330
Reversal of allowance for credit losses	-2	0	-8	-2
Net interest income	140	119	392	332
Non-interest gain (loss) on -	'	'	'	'
Trading securities	-6	-2	-18	-11
Derivatives and hedging activities	1	-11	-11	19
Instruments held under fair value option	10	-2	11	1
Early extinguishment of debt	1	1	1	1
Litigation settlement awards	1	0	18	2
Other, net	4	4	13	14
Total non-interest gain (loss)	11	-10	14	26
Non-interest expense -	'	'	'	'
Compensation and benefits	17	16	49	44
Other operating expenses	12	8	34	28
Federal Housing Finance Agency	1	1	3	3
Office of Finance	1	1	3	3
Other community investment	0	0	0	-50
Other	-3	0	0	-2
Total non-interest expense	28	26	89	26
Income before assessments	123	83	317	332
Affordable Housing Program assessment	13	8	32	28
Net income	$110	$75	$285	$304

Statements_of_Comprehensive_In

Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$110	$75	$285	$304
Other comprehensive income (loss) -	'	'	'	'
Net unrealized gain (loss) on available-for-sale securities	-99	-13	37	-450
Non-credit OTTI on available-for-sale securities	0	0	0	8
Net unrealized gain (loss) on held-to-maturity securities transferred from available-for-sale	0	1	0	2
Non-credit OTTI on held-to-maturity securities	15	15	43	46
Net unrealized gain (loss) on cash flow hedges	85	19	91	339
Post retirement plans	-2	-1	1	0
Other comprehensive income (loss)	-1	21	172	-55
Comprehensive income	$109	$96	$457	$249

Statements_of_Stockholders_Equ

Statements of Stockholders' Equity (USD $)	Total	Total Capital Stock	Retained Earnings, Unrestricted	Retained Earnings, Restricted	Retained Earnings, Total	AOCI	Capital Stock - Putable - B1	Capital Stock - Putable - B2
In Millions, unless otherwise specified							Total Capital Stock	Total Capital Stock
Balance, beginning at Dec. 31, 2012	$3,448	$1,650	$1,584	$107	$1,691	$107	$122	$1,528
Shares, beginning at Dec. 31, 2012	'	16	'	'	'	'	1	15
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'
Total comprehensive income	249	'	244	60	304	-55	'	'
Proceeds from issuance of capital stock	224	224	'	'	'	'	164	60
Repurchases of capital stock	-253	-253	'	'	'	'	-42	-211
Capital stock reclassified to mandatorily redeemable capital stock	-58	-58	'	'	'	'	-56	-2
Transfers between B1 and B2 capital stock	'	'	'	'	'	'	303	-303
Cash dividends - class B1	0	'	0	'	0	'	'	'
Cash dividends - class B2	-4	'	-4	'	-4	'	'	'
Proceeds from issuance of capital stock (shares)	'	2	'	'	'	'	2	0
Repurchases of capital stock (shares)	'	-1	'	'	'	'	0	-1
Capital stock reclassified to mandatorily redeemable capital stock (shares)	'	-1	'	'	'	'	-1	0
Transfers between B1 and B2 capital stock (shares)	'	'	'	'	'	'	3	-3
Balance, ending at Sep. 30, 2013	3,606	1,563	1,824	167	1,991	52	491	1,072
Shares, ending at Sep. 30, 2013	'	16	'	'	'	'	5	11
Balance, beginning at Dec. 31, 2013	3,765	1,670	1,853	175	2,028	67	629	1,041
Shares, beginning at Dec. 31, 2013	'	17	'	'	'	'	7	10
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'
Total comprehensive income	457	'	228	57	285	172	'	'
Proceeds from issuance of capital stock	277	277	'	'	'	'	234	43
Repurchases of capital stock	-146	-146	'	'	'	'	-45	-101
Capital stock reclassified to mandatorily redeemable capital stock	0	'	'	'	'	'	'	'
Transfers between B1 and B2 capital stock	'	'	'	'	'	'	-115	115
Cash dividends - class B1	-5	'	-5	'	-5	'	'	'
Cash dividends - class B2	-4	'	-4	'	-4	'	'	'
Proceeds from issuance of capital stock (shares)	'	3	'	'	'	'	2	1
Repurchases of capital stock (shares)	'	-2	'	'	'	'	-1	-1
Transfers between B1 and B2 capital stock (shares)	'	'	'	'	'	'	-1	1
Balance, ending at Sep. 30, 2014	$4,344	$1,801	$2,072	$232	$2,304	$239	$703	$1,098
Shares, ending at Sep. 30, 2014	'	18	'	'	'	'	7	11

Statements_of_Stockholders_Equ1

Statements of Stockholders' Equity (Parenthetical)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Capital Stock - Putable - B1	'	'
Capital Unit [Line Items]	'	'
Cash dividend - annualized rate per $100 par value share	1.43%	0.30%
Capital Stock - Putable - B2	'	'
Capital Unit [Line Items]	'	'
Cash dividend - annualized rate per $100 par value share	0.43%	0.30%

Condensed_Statements_of_Cash_F

Condensed Statements of Cash Flows (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013
Operating-	'		'
Net cash provided by (used in) operating activities	$592		$702
Investing-	'		'
Net change Federal Funds sold	-1,283		-689
Net change securities purchased under agreements to resell	4,550		4,450
Net change interest bearing deposits	-560		0
Advances-	'		'
Principal collected	188,332		203,141
Issued	-191,556		-203,545
MPF Loans held in portfolio-	'		'
Principal collected	1,353		2,303
Purchases	-64		-61
Trading securities-	'		'
Sales	2,002		50
Proceeds from maturities and paydowns	867		2,136
Purchases	-1,812		-1,364
Held-to-maturity securities-	'		'
Short-term held-to-maturity securities, net	503	[1]	630	[1]
Proceeds from maturities	833		1,364
Purchases	-22		-11
Available-for-sale securities-	'		'
Proceeds from maturities	1,157		843
Proceeds from sale of foreclosed assets	76		75
Capital expenditures for software and equipment	-8		-9
Net cash provided by (used in) investing activities	4,368		9,313
Financing-	'		'
Net change deposits	-14		-218
Net proceeds from issuance of consolidated obligations-	'		'
Discount notes	924,591		526,897
Bonds	16,891		14,397
Payments for maturing and retiring consolidated obligations-	'		'
Discount notes	-925,174		-538,635
Bonds	-13,888		-10,760
Net proceeds (payments) on derivative contracts with financing element	-46		-53
Proceeds from issuance of capital stock	277		224
Repurchase or redemption of capital stock	-146		-253
Redemptions of mandatorily redeemable capital stock	0		-59
Cash dividends paid	-9		-4
Net cash provided by (used in) financing activities	2,482		-8,464
Net increase (decrease) in cash and due from banks	7,442		1,551
Cash and due from banks at beginning of year	971		3,564
Cash and due from banks at end of period	8,413		5,115
Supplemental-	'		'
Capital stock reclassified to mandatorily redeemable capital stock	0		58
Transfer of MPF Loans to real estate owned	$51		$63
[1]	Short-term held-to-maturity securities, net, consists of investment securities with a maturity of less than 90 days when purchased.

Background_and_Basis_of_Presen

Background and Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Background and Basis of Presentation [Text Block]	'
	Background and Basis of Presentation
	The Federal Home Loan Bank of Chicago a is a federally chartered corporation and one of 12 Federal Home Loan Banks (the FHLBs) that, with the Office of Finance, comprise the Federal Home Loan Bank System (the System).  The FHLBs are government-sponsored enterprises (GSE) of the United States of America and were organized under the Federal Home Loan Bank Act of 1932, as amended (FHLB Act), in order to improve the availability of funds to support home ownership.  The FHLBs are regulated by the Federal Housing Finance Agency (FHFA), an independent federal agency. We provide credit to members principally in the form of secured loans called advances. We also provide liquidity for home mortgage loans to members approved as Participating Financial Institutions (PFIs) through the Mortgage Partnership Finance® (MPF®) Program b.
	Our accounting and financial reporting policies conform to generally accepted accounting principles in the United States of America (GAAP). Amounts in prior periods may be reclassified to conform to the current presentation and if material are disclosed in the following notes.
	In the opinion of management, all normal recurring adjustments have been included for a fair statement of this interim financial information. These unaudited financial statements and the following footnotes should be read in conjunction with the audited financial statements and footnotes for the year ended December 31, 2013, included in our Annual Report on Form 10-K (2013 Form 10-K) starting on page F-1, as filed with the SEC.
	Use of Estimates
	The preparation of financial statements in accordance with GAAP requires us to make assumptions and estimates that may affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of income and expense. The most significant of these assumptions and estimates apply to the following:
	•	Determination of other-than-temporary impairments of securities;
	•	Allowance for credit losses; and
	•	Fair value measurements. See Note 2 - Summary of Significant Accounting Policies and Note 13 - Fair Value Accounting for more information.
	Actual results could differ from these assumptions and estimates.
	Consolidation of Variable Interest Entities
	We do not consolidate any of our investments in variable interest entities. Our investments in variable interest entities include, but are not limited to, senior interests in private label mortgage backed securities (MBS), and Family Federal Education Loan Program (FFELP) asset backed securities (ABS). We determined that we are not the primary beneficiary in any of these investments in variable interest entities as of the periods presented.  Refer to our 2013 Form 10-K Note 1 - Background and Basis of Presentation to the financial statements for further details.
	Statements of Cash Flows
	For purposes of the statements of cash flows, we consider only cash and due from banks as cash and cash equivalents.
	Gross versus Net Presentation of Financial Instruments
	We present our derivative assets and liabilities on a net basis in our statements of condition. We net cash collateral, including initial and variation margin, and accrued interest received from or pledged to clearing agents and/or our counterparties. The fair values of derivatives are netted by clearing agent and/or counterparty where we have a legal right of setoff, by contract (e.g., master netting agreement) or otherwise, to discharge all or a portion of the debt owed to our counterparty by applying against the debt an amount that our counterparty owes to us. Our right of setoff is enforceable at law. We have analyzed the enforceability of offsetting rights incorporated in our cleared derivative transactions and determined that the exercise of those offsetting rights by a non-defaulting party under these transactions should be upheld under applicable law upon an event of default including a bankruptcy, insolvency or similar proceeding involving the clearinghouse or our clearing agent, or both. Based on this analysis, we present a net derivative asset or liability for all of our transactions through a particular clearing agent with a particular clearinghouse.
	a	Unless otherwise specified, references to we, us, our, and the Bank are to the Federal Home Loan Bank of Chicago.
	b	“Mortgage Partnership Finance”, “MPF”, and “MPF Xtra” are registered trademarks of the Federal Home Loan Bank of Chicago. “Community First” is a trademark of the Federal Home Loan Bank of Chicago.
	Our net exposure for derivative transactions may change on a daily basis, which may result in a delay between the time the change in our net exposure is identified and additional collateral is requested, and the time such collateral is received or pledged. Our net exposure also may be affected by a delay in the return of excess collateral. For derivative instruments that meet the requirements for netting, any excess cash collateral received or pledged relative to our position with a counterparty is recognized as a derivative liability or derivative asset.
	We present our securities purchased under agreements to resell, if any, on a gross basis in our statements of condition. Our securities purchased under agreements to resell were fully collateralized for the periods presented based on the fair value of the underlying collateral. Separately, we do not have any securities sold under agreements to repurchase or securities borrowing or lending transactions for the periods presented.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies [Text Block]	'
	Summary of Significant Accounting Policies
	Our Summary of Significant Accounting Policies can be found in our 2013 Form 10-K starting on page F-11.
	Joint and Several Liability Arrangements
	We adopted new GAAP guidance applicable to joint and several liability arrangements effective January 1, 2014. Under the new guidance, joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date and any additional estimated amount we expect to pay on behalf of other FHLBs is measured and recognized at the reporting date. Transition to the new guidance was done on a retrospective basis. The new guidance did not have an effect on either our current or prior operating activities or financial statements. For further discussion of our joint and several liability see Note 10 - Consolidated Obligations to the financial statements.
	Litigation Settlement Awards and related Litigation Settlement Legal Expenses
	In the third quarter of 2014 we recognized $1 million in litigation settlement awards, slightly offset by litigation settlement legal expenses. Litigation settlement awards received for the nine months ended September 30, 2014 is $18 million. The awards were recorded in "Non-interest gain (loss) on - Litigation settlement awards". The expenses were recorded in "Non-interest expense - Other". These awards and expenses were recognized when realized. See page F-17 in Note 2 – Summary of Significant Accounting Policies to the financial statements in our 2013 Form 10-K for further details.

Recently_Issued_but_Not_Yet_Ad

Recently Issued but Not Yet Adopted Accounting Standards	9 Months Ended
	Sep. 30, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Recently Issued but Not Yet Adopted Accounting Standards [Text Block]	'
	Recently Issued but Not Yet Adopted Accounting Standards
	Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure
	In August of 2014, the FASB issued new guidance with respect to how to reclassify certain government-guaranteed mortgage loans upon foreclosure for accounting purposes. The new guidance requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure provided the conditions shown below are met.
	•	The loan has a government guarantee that is not separable from the loan before foreclosure.
	•	At the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee and the creditor has the ability to recover under that claim.
	•	At the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate value is fixed.
	Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. Our foreclosed government MPF Loans are now classified in Real Estate Owned (REO) in Other Assets. Under the new guidance, we would reclassify our government MPF Loans to a receivable account in Other Assets upon foreclosure regardless of whether or not the Bank has received legal title or a deed in lieu. We do not expect any effect on our statements of income since our credit risk on government MPF Loans is limited to whether or not the servicing PFI fails to pay for losses not covered by FHA or HUD insurance, or VA or RHS guarantees. We expect to adopt this new guidance on a prospective basis for government MPF Loans. Specifically, government MPF Loans foreclosed on or after January 1, 2015, will be classified as a receivable rather than REO. We do not expect the new guidance to have a material effect on our operating activities or our financial statements.
	Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures
	In June of 2014, the FASB issued new accounting guidance that changes the accounting treatment for repurchase-to-maturity transactions and repurchase financing transactions. The key provisions include, but are not limited to: requiring repurchase-to-maturity provisions to be accounted for as secured borrowings rather than as sales, requiring the initial transfer and repurchase agreement in repurchase financing transactions to be accounted for as separate rather than linked transactions, and new disclosure requirements. The new accounting guidance is effective for annual and interim reporting periods beginning January 1, 2015. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of January 1, 2015. We are in the process of determining what, if any, impact this may have on our operating activities and financial statements.
	Revenue from Contracts with Customers
	In May of 2014, the FASB issued new guidance governing revenue recognition from contracts with customers. Financial instruments and other contractual rights within the scope of other GAAP guidance are excluded from the scope of this new revenue recognition guidance. In this regard, it is expected that a majority of our contracts with members would be excluded from the scope of this new guidance. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled, in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps:
	•	Step 1: Identify the contract(s) with a customer.
	•	Step 2: Identify the performance obligations in the contract.
	•	Step 3: Determine the transaction price.
	•	Step 4: Allocate the transaction price to the performance obligations in the contract.
	•	Step 5: Recognize revenue when (or as) the entity satisfies a performance obligation.
	The new revenue recognition guidance becomes effective for annual interim reporting periods beginning January 1, 2017. We are in the process of reviewing our contracts with members to determine the effect, if any, on our operating activities and financial statements.
	Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure
	In January of 2014, the FASB issued new accounting guidance clarifying when consumer mortgage loans collateralized by real estate should be reclassified to Real Estate Owned (REO). Specifically, such collateralized mortgage loans should be reclassified to REO when either the creditor obtains legal title to the residential real estate property upon completion of a foreclosure or the borrower conveys all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. The new guidance becomes effective January 1, 2015 for interim and annual periods of the Bank. Our existing practice of reclassifying MPF Loans is consistent with this new guidance. As a result, we do not need to select a transition method and we do not believe the new guidance will have any effect on our operating activities and financial statements.
	Asset Classification and Charge-off Provisions
	On April 9, 2012, the FHFA issued Advisory Bulletin 2012-02, Framework for Adversely Classifying Loans, Other Real Estate Owned, and Other Assets and Listing Assets for Special Mention (AB 2012-02). The guidance in AB 2012-02 is generally consistent with the Uniform Retail Credit Classification and Account Management Policy issued by the federal banking regulators in June 2000. AB 2012-02 mandates a standard and uniform methodology for classifying assets, prescribes the timing of asset charge-offs (excluding investment securities), provides measurement guidance with respect to determining our allowance for credit losses, and fair value measurement guidance for REO (e.g., use of appraisals). Subsequent to the issuance of AB 2012-02, the FHFA issued interpretative guidance clarifying that implementation of the asset classification framework may occur in two phases. We implemented the asset classification provisions effective January 1, 2014. As permitted under AB 2012-02, we will implement the charge-off provisions effective January 1, 2015 on a prospective basis. We do not anticipate the timing of our credit loss recognition to be affected by implementing AB 2012-02 given that the timing of our current credit loss recognition is based on the Uniform Retail Credit Classification and Account Management Policy issued by the federal banking regulators in June 2000, and the guidance in AB 2012-02 considers and is generally consistent with the Uniform Retail Credit Classification and Account Management Policy. We are in the process of determining the financial statement effects, if any, of implementing AB 2012-02 charge-off provisions on our operating activities and financial statements.

Interest_Income_and_Interest_E

Interest Income and Interest Expense	9 Months Ended
	Sep. 30, 2014
Interest Income (Expense), Net [Abstract]	'
Interest Income and Interest Expense Disclosure [Text Block]	'
	Interest Income and Interest Expense
	The following table presents interest income and interest expense for the periods indicated:
		Three months ended September 30,					Nine months ended September 30,
		2014			2013		2014			2013
	Interest income -
	Federal Funds sold, securities purchased under agreements to resell, and interest bearing deposits	$	2		$	1	$	6		$	7
	Investment securities -
	Trading	6			2		21			11
	Available-for-sale	136			145		415			442
	Held-to-maturity	72			79		223			251
	Total investment securities	214			226		659			704
	Advances -
	Advance interest income	35			37		108			107
	Advance prepayment fees, including related hedge adjustment gains (losses) of $0, $10, $0, and $10	4			17		8			30
	Total Advances	39			54		116			137
	MPF Loans held in portfolio, net	78			92		252			308
	Total interest income	333			373		1,033			1,156
	Interest expense -
	Consolidated obligations -
	Discount notes	68			71		201			222
	Bonds	114			170		408			562
	Total consolidated obligations	182			241		609			784
	Subordinated notes	13			13		40			42
	Total interest expense	195			254		649			826
	Net interest income before provision for credit losses	138			119		384			330
	Reversal of allowance for credit losses	(2		)	—		(8		)	(2		)
	Net interest income	$	140		$	119	$	392		$	332

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Marketable Securities [Text Block]	'
	Investment Securities
	Our major security types presented in the tables below are defined as follows:
	•	U.S. Government & other government related may consist of the sovereign debt of the United States; debt issued by Fannie Mae, Freddie Mac, and the Federal Farm Credit Banks Funding Corporation; and non-mortgage-backed securities of the Small Business Administration, Federal Deposit Insurance Corporation (FDIC), and Tennessee Valley Authority.
	•	Federal Family Education Loan Program - asset backed securities (FFELP ABS).
	•	Government Sponsored Enterprises (GSE) residential mortgage-backed securities (MBS) issued by Fannie Mae and Freddie Mac.
	•	Government-guaranteed residential MBS.
	•	Private-label residential MBS.
	•	State or local housing agency obligations.
	Gains and losses on sales of securities are determined using the specific identification method and are included in non-interest gain (loss) on the statements of income.
	Pledged Collateral
	We transact most of our derivatives with large banks and major broker-dealers. Derivative transactions may be entered into either through an over-the-counter bilateral agreement with an individual counterparty or through a Futures Commission Merchant (FCM or clearing member) with a derivatives clearing organization (clearinghouse). We may pledge investment securities as collateral under these agreements, and in such cases, the amount pledged will be noted on the face of the statements of condition. We pledged $58 million of investment securities as collateral for our initial margin with derivative clearing organizations as of September 30, 2014, and $32 million as of December 31, 2013. See Note 9 - Derivatives and Hedging Activities for further details.
	Trading Securities
	The following table presents the fair value of our trading securities. We had no material gains or losses realized from the sales of trading securities.
	As of		September 30, 2014				December 31, 2013
	U.S. Government & other government related		$	754			$	1,823
	Residential MBS:
	GSE		66				74
	Government-guaranteed		2				2
	Total Residential MBS		68				76
	Trading securities		$	822			$	1,899
	At September 30, 2014, and 2013, we had net year-to-date unrealized gains (losses) of $(4) million and $(11) million on trading securities still held at period end.
	Amortized Cost Basis and Fair Value – Available-for-Sale Securities (AFS)
		Amortized Cost Basis				Gross Unrealized Gains in AOCI				Gross Unrealized Losses in AOCI				Carrying Amount and Fair Value
	As of September 30, 2014
	U.S. Government & other government related	$	481			$	30			$	—			$	511
	FFELP ABS	6,019				435				(10		)		6,444
	Residential MBS:
	GSE	10,371				531				(6		)		10,896
	Government-guaranteed	2,352				102				—				2,454
	Private-label	67				7				—				74
	Total Residential MBS	12,790				640				(6		)		13,424
	Total	$	19,290			$	1,105			$	(16	)		$	20,379
	As of December 31, 2013
	U.S. Government & other government related	$	560			$	29			$	(1	)		$	588
	FFELP ABS	6,395				425				(17		)		6,803
	Residential MBS:
	GSE	10,888				518				(24		)		11,382
	Government-guaranteed	2,572				119				—				2,691
	Private-label	69				3				—				72
	Total Residential MBS	13,529				640				(24		)		14,145
	Total	$	20,484			$	1,094			$	(42	)		$	21,536
	We had no proceeds or gains (losses) on the sale of AFS securities for the periods presented.
	Amortized Cost Basis, Carrying Amount, and Fair Value - Held-to-Maturity Securities (HTM)
		Amortized				Non-credit OTTI Recognized in AOCI (Loss)				Carrying				Gross				Gross			Fair Value
		Cost Basis								Amount				Unrecognized				Unrecognized
														Holding				Holding
														Gains				Losses
	As of September 30, 2014
	U.S. Government & other government related	$	1,618			$	—			$	1,618			$	66			$	(1	)	$	1,683
	State or local housing agency	18				—				18				—				—			18
	Residential MBS:
	GSE	2,793				—				2,793				186				—			2,979
	Government-guaranteed	1,165				—				1,165				30				—			1,195
	Private-label	1,368				(277		)		1,091				438				(1		)	1,528
	Total Residential MBS	5,326				(277		)		5,049				654				(1		)	5,702
	Total	$	6,962			$	(277	)		$	6,685			$	720			$	(2	)	$	7,403
	As of December 31, 2013
	U.S. Government & other government related	$	2,259			$	—			$	2,259			$	42			$	(1	)	$	2,300
	State or local housing agency	22				—				22				—				—			22
	Residential MBS:
	GSE	3,193				—				3,193				186				—			3,379
	Government-guaranteed	1,248				—				1,248				32				—			1,280
	Private-label	1,515				(320		)		1,195				444				(2		)	1,637
Total Residential MBS	5,956				(320		)		5,636				662				(2		)	6,296
Total	$	8,237			$	(320	)		$	7,917			$	704			$	(3	)	$	8,618
We had no proceeds or gains (losses) on the sale of HTM securities for the periods presented.
Aging of Unrealized Temporary Losses
The following tables present unrealized temporary losses on our AFS and HTM portfolio for periods less than 12 months and for 12 months or more. We recognized no OTTI charges on these unrealized loss positions because we expect to recover the entire amortized cost basis, we do not intend to sell these securities, and we believe it is more likely than not that we will not be required to sell them prior to recovering their amortized cost basis. In the tables below, in cases where the gross unrealized losses for an investment category are less than $1 million, the losses are not reported.
Available-for-Sale Securities
	Less than 12 Months								12 Months or More								Total
	Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value			Gross Unrealized Losses
As of September 30, 2014
FFELP ABS	$	3			$	—			$	921			$	(10	)		$	924		$	(10	)
Residential MBS:
GSE	—				—				2,033				(6		)		2,033			(6		)
Private-label	—				—				1				—				1			—
Total Residential MBS	—				—				2,034				(6		)		2,034			(6		)
Total	$	3			$	—			$	2,955			$	(16	)		$	2,958		$	(16	)
As of December 31, 2013
U.S. Government & other government related	$	40			$	(1	)		$	—			$	—			$	40		$	(1	)
FFELP ABS	22				—				969				(17		)		991			(17		)
Residential MBS:
GSE	—				—				3,293				(24		)		3,293			(24		)
Private-label	—				—				9				—				9			—
Total Residential MBS	—				—				3,302				(24		)		3,302			(24		)
Total	$	62			$	(1	)		$	4,271			$	(41	)		$	4,333		$	(42	)
Held-to-Maturity Securities
	Less than 12 Months								12 Months or More								Total
	Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value			Gross Unrealized Losses
As of September 30, 2014
U.S. Government & other government related	$	14			$	—			$	4			$	(1	)		$	18		$	(1	)
State or local housing agency	10				—				—				—				10			—
Residential MBS:
GSE	—				—				5				—				5			—
Private-label	15				—				1,435				(278		)		1,450			(278		)
Total Residential MBS	15				—				1,440				(278		)		1,455			(278		)
Total	$	39			$	—			$	1,444			$	(279	)		$	1,483		$	(279	)
As of December 31, 2013
U.S. Government & other government related	$	85			$	(1	)		$	—			$	—			$	85		$	(1	)
State or local housing agency	10				—				—				—				10			—
Residential MBS:
GSE	10				—				—				—				10			—
Private-label	—				—				1,532				(322		)		1,532			(322		)
Total Residential MBS	10				—				1,532				(322		)		1,542			(322		)
Total	$	105			$	(1	)		$	1,532			$	(322	)		$	1,637		$	(323	)
Contractual Maturity Terms
The table below presents the amortized cost basis and fair value of AFS and HTM securities by contractual maturity, excluding ABS and MBS securities. These securities are excluded because their expected maturities may differ from their contractual maturities if borrowers of the underlying loans elect to prepay their loans.
		Available-for-Sale								Held-to-Maturity
As of September 30, 2014		Amortized Cost Basis				Carrying Amount and Fair Value				Carrying Amount				Fair
														Value
Year of Maturity -
Due in one year or less		$	—			$	—			$	175			$	175
Due after one year through five years		96				101				54				54
Due after five years through ten years		2				2				395				410
Due after ten years		383				408				1,012				1,062
ABS and MBS without a single maturity date		18,809				19,868				5,049				5,702
Total securities		$	19,290			$	20,379			$	6,685			$	7,403
Other-Than-Temporary Impairment
We recognize credit losses into earnings on securities in an unrealized loss position for which we do not expect to recover the entire amortized cost basis. Non-credit losses are recognized in AOCI since we do not intend to sell these securities and we believe it is more likely than not that we will not be required to sell any investment security before the recovery of its amortized cost basis. The non-credit loss in AOCI on HTM securities are accreted back into the HTM securities over their remaining lives as an increase to the carrying amount, since we ultimately expect to collect these amounts. See Statements of Comprehensive Income on page 5.
Significant Inputs Used to Determine OTTI
Our analysis for OTTI on our private-label MBS includes key modeling assumptions, significant inputs, and methodologies provided by an FHLB System OTTI Governance Committee, formed to achieve consistency among the FHLBs in their analyses of OTTI. We use the information provided to generate cash flow projections used in analyzing credit losses and determining OTTI. We are responsible for making our own determination of impairment, which includes determining the reasonableness of assumptions, significant inputs, and methodologies used, and performing the required present value calculations using appropriate historical cost bases and yields. Previously, long-term home price projections following the short-term period were projected to recover using one of five different recovery paths. Starting with the second quarter of 2014, a unique path was projected for each geographic area based on an internally developed framework derived from historical data. Based on these inputs and assumptions for the three and nine months ended September 30, 2014, and 2013, we had no OTTI charges.
Unpaid Principal Balance, Amortized Cost, Carrying Amount, and Fair Value - OTTI Private-Label MBS
The table below presents private-label MBS that have incurred OTTI at some point in time since we acquired the security. Each private-label MBS presented below is classified as prime, subprime, or Alt-A. Such classification depends upon the nature of the majority of underlying mortgages collateralizing each private-label MBS based on the issuer's classification, or as published by a nationally recognized statistical rating organization (NRSRO), at the time of issuance of the MBS.
As of September 30, 2014		Unpaid Principal Balance				Amortized Cost Basis				Non-Credit OTTI				Gross Unrealized Gains				Carrying Amount			Fair Value
OTTI AFS Securities-
Private-label residential MBS:
Alt-A		$	98			$	65			$	—			$	7			$	72		$	72
OTTI HTM Securities-
Private-label residential MBS:
Prime		$	1,051			$	828			$	(203	)		$	—			$	625		$	895
Subprime		652				407				(74		)		—				333			500
Total OTTI HTM securities		$	1,703			$	1,235			$	(277	)		$	—			$	958		$	1,395
The following table presents the changes in the cumulative amount of credit losses (recognized into earnings) on OTTI investment securities for the periods stated.
		Three months ended September 30,									Nine months ended September 30,
		2014					2013				2014				2013
Beginning Balance		$	649				$	701			$	677			$	717
Reductions:					3
Increases in cash flows expected to be collected that have been recognized as accretion into net interest income		(15		)	5		(11		)		(43		)		(27		)
Ending Balance		$	634				$	690			$	634			$	690

Advances

Advances	9 Months Ended
	Sep. 30, 2014
Federal Home Loan Banks [Abstract]	'
Advances [Text Block]	'
	Advances
	We offer a wide range of fixed- and variable-rate advance products with different maturities, interest rates, payment characteristics and optionality. We did not have any advances with embedded features that met the requirements to separate the embedded feature from the host contract and designate the embedded feature as a stand-alone derivative at September 30, 2014, and December 31, 2013. The following table presents our advances by callable/putable features:
	As of		September 30, 2014		December 31, 2013
	Noncallable/nonputable		$	23,985	$	20,259
	Callable		964		1,440
	Putable		1,699		1,726
	Total par value		26,648		23,425
	Hedging adjustments		98		39
	Other adjustments		20		25
	Total advances		$	26,766	$	23,489
	The following table presents our advances by redemption terms:
	As of September 30, 2014		Amount		Weighted Average Interest Rate			Next Maturity or Call Date		Next Maturity or Put Date
	Due in one year or less		$	5,571	0.36	%		$	6,533	$	7,269
	One to two years		2,818		1.8	%		2,668		2,089
	Two to three years		1,518		2.74	%		1,360		1,102
	Three to four years		4,377		1.03	%	a	3,900		3,859
	Four to five years		10,776		0.2	%	a	10,604		10,766
	More than five years		1,588		3.05	%		1,583		1,563
	Total par value		$	26,648	0.85	%		$	26,648	$	26,648
	a	Low weighted average interest rate is relatively lower when compared to other categories due to a majority of advances in this category consisting of variable rate advances which are at low current market rates of interest.
	We lend to members within our district according to Federal statutes, including the FHLB Act. The FHLB Act requires us to hold, or have access to, collateral to secure our advances, and we do not expect to incur any credit losses on advances. We have policies and procedures in place that are designed to manage our credit risk, including requirements for physical possession or control of pledged collateral, restrictions on borrowing, verifications of collateral and continuous monitoring of borrowings and the member's financial condition. We continue to monitor the collateral and creditworthiness of our borrowers. Based on the collateral pledged as security for advances and our credit analyses of our members' financial condition and our credit extension and collateral policies, we expect to collect all amounts due according to the contractual terms of our advances. See Note 8 - Allowance for Credit Losses for information related to our credit risk on advances and allowance methodology for credit losses.

MPF_Loans

MPF Loans	9 Months Ended
	Sep. 30, 2014
Mortgage Loans on Real Estate [Abstract]	'
MPF Loans [Text Block]	'
	MPF Loans
	The following table presents information on MPF Loans held in our portfolio by contractual maturity at the time of purchase. All are fixed-rate. Government is comprised of loans insured by the Federal Housing Administration (FHA) or the Department of Housing and Urban Development (HUD) and loans guaranteed by the Department of Veteran Affairs (VA) or Department of Agriculture Rural Housing Service (RHS).
	As of	September 30, 2014			December 31, 2013
	Medium term (15 years or less)	$	1,222		$	1,672
	Long term (greater than 15 years)	5,138			5,959
	Total unpaid principal balance	6,360			7,631
	Net premiums, credit enhancement and deferred loan fees	24			27
	Hedging adjustments	54			66
	Total before allowance for credit losses	6,438			7,724
	Allowance for credit losses on MPF Loans	(16		)	(29		)
	Total MPF Loans held in portfolio, net	$	6,422		$	7,695
	Conventional mortgage loans	$	4,941		$	5,969
	Government insured mortgage loans	1,419			1,662
	Total unpaid principal balance	$	6,360		$	7,631
	See Note 8 - Allowance for Credit Losses for information related to our credit risk on MPF Loans and allowance for credit losses methodology.

Allowance_for_Credit_Losses

Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Allowance for Credit Losses [Text Block]	'
	Allowance for Credit Losses
	We have established an allowance methodology for each of our portfolio segments:
	•credit products (advances, letters of credit and other extensions of credit to borrowers);
	•conventional MPF Loans held for portfolio;
	•government MPF Loans held for portfolio; and
	•term Federal Funds sold and term securities purchased under agreements to resell.
	For detailed information on these methodologies and our accounting policies please see Note 8 - Allowance for Credit Losses to the financial statements in our 2013 Form 10-K. Any updates to these accounting policies are noted below.
	Credit Products
	For the periods presented, we had no credit products that were past due, on nonaccrual status, or considered impaired. In addition, there have been no troubled debt restructurings related to our credit products during the periods then ended. Based upon the collateral we held as security, our credit extension and collateral policies, our credit analysis and the repayment history on credit products, we do not believe that any credit losses have been incurred on our credit products; accordingly, we have not recorded any allowance for credit losses for our credit products. Additionally, no liability was recorded to reflect an allowance for credit losses for our credit products with off-balance sheet credit exposures.
	Conventional MPF Loans
	MPF Risk Sharing Structure
	For a definition of MPF Risk Sharing Structure see page F-29 in our 2013 Form 10-K. We share the risk of credit losses on conventional MPF Loan products with our PFIs (excluding the MPF Xtra product) by structuring potential losses on conventional MPF Loans into layers with respect to each master commitment (MC). We require that conventional MPF Loans held in our portfolio be credit enhanced at inception so that our risk of loss is limited to be equivalent to the losses of an investor in an AA rated mortgage backed security. As a part of our methodology to determine the amount of credit enhancement necessary, we analyze the risk characteristics of each MPF Loan using a model licensed from an NRSRO. We use the model to evaluate loan data provided by the PFI as well as other relevant information.
	The table below presents the impact of the MPF Risk Sharing Structure and severity rates on our allowance for credit losses. For detailed definitions of how Total Severity Rate and Credit Loss Severity Rate are calculated, see Loss Severity on page F-31 in our 2013 Form 10-K.
	As of		September 30, 2014				December 31, 2013
	Total Severity Rate		27		%		35		%
	Credit Loss Severity Rate		13		%		19		%
	Total estimated losses outstanding		$	51			$	65
	Less: losses expected to be absorbed by MPF Risk Sharing Structure		(20		)	a	(18		)	a
	Our share of total losses		31				47
	Less: non-credit losses		(16		)		(21		)
	Credit losses		15				26
	Plus: other estimated credit losses in the remaining portfolio		1				3
	Allowance for credit losses on conventional MPF Loans		$	16			$	29
	a	Represents aggregate of credit enhancements across all master commitments expected to be recovered. Credit enhancement from one master commitment may not be used to offset credit losses incurred by another master commitment.
	The following table presents the changes in the allowance for credit losses on conventional MPF Loans.
			For the three months ended								For the nine months ended
			September 30, 2014				September 30, 2013				September 30, 2014			September 30, 2013
	Balance, beginning of period		$	19			$	34			$	29		$	42
	Losses charged to the allowance		(1		)		(2		)		(5		)	(8		)
	Provision for (reversal of) credit losses		(2		)		—				(8		)	(2		)
	Balance, end of period		$	16			$	32			$	16		$	32
	The following table presents the recorded investment by impairment methodology on conventional MPF Loans.
	As of		September 30, 2014				December 31, 2013
	Specifically identified and individually evaluated for impairment		$	12			$	22
	Homogeneous pools of loans and collectively evaluated for impairment		4				7
	Allowance for credit losses on conventional MPF Loans		$	16			$	29
	Individually evaluated for impairment - with an allowance		$	172			$	215
	Collectively evaluated for impairment		4,855				5,861
	Total recorded investment		$	5,027			$	6,076
	Government MPF Loans Held for Portfolio
	The PFI provides and maintains insurance or a guaranty from governmental agencies, which includes ensuring compliance with all of their requirements, and obtaining the benefit of the applicable insurance or guaranty with respect to defaulted government MPF Loans. Any losses incurred on government MPF Loans that are not recovered from the government insurer or guarantor are absorbed by the servicing PFI. Accordingly, our credit risk on government MPF Loans is limited to whether or not the servicing PFI fails to pay for losses not covered by FHA or HUD insurance, or VA or RHS guarantees. In this regard, based on our assessment of the servicing PFIs, we did not establish an allowance for credit losses for our government MPF Loan portfolio as of the periods presented. Further, due to the government guarantee or insurance and the servicing PFIs ability to absorb losses, government MPF Loans are not placed on nonaccrual status or disclosed as troubled debt restructurings.
	Credit Quality Indicators - MPF Loans
	The table below summarizes our recorded investment in MPF Loans by our key credit quality indicators.
			September 30, 2014											December 31, 2013
	As of		Conventional				Government				Total			Conventional				Government				Total
	Past due 30-59 days		$	141			$	88			$	229		$	165			$	104			$	269
	Past due 60-89 days		38				24				62			50				31				81
	Past due 90 days or more		165				40			a	205			202				151				353
	Total past due		344				152				496			417				286				703
	Total current		4,683				1,291				5,974			5,659				1,401				7,060
	Total recorded investment		$	5,027			$	1,443			$	6,470		$	6,076			$	1,687			$	7,763
	Also in process of foreclosure		$	85			$	12		a	$	97		$	108			$	51			$	159
	Serious delinquency rate	b	3.3		%		2.77		%	a	3.18		%	3.37		%	c	8.94		%	c	4.58		%	c
	Past due 90 days or more still accruing interest	d	$	25			$	40			$	65		$	27			$	151			$	178
	On nonaccrual status		$	176			$	—			$	176		$	221			$	—			$	221
	a	During the third quarter of 2014, as permitted under our MPF Program Guides for Government MPF Loans, one of our servicers elected at their option to repurchase $109 million of their delinquent loans from us at their outstanding unpaid principal balance, rather than continue to advance to us payments of principal and interest when they are not collecting these amounts from the borrower.
	b	MPF Loans that are 90 days or more past due or in the process of foreclosure as a percentage of the total recorded investment.
	c	We corrected an error to adjust the serious delinquency rate of MPF Loans disclosed above as of December 31, 2013, as previously reported in our 2013 Form 10-K and in our Form 10-Q as of March 31, 2014.  The error had no effect on our allowance for credit losses as of December 31, 2013, because this rate was not used when determining our allowance for credit losses.  After evaluating the quantitative and qualitative aspects of these adjustments, we concluded that prior period financial statements were not materially misstated. Further, the error had no effect on our 2014 financial statements.
	d	Consists of MPF Loans that are either government guaranteed or conventional mortgage loans that are well secured (by collateral that have a realizable value sufficient to discharge the debt or by the guarantee or insurance, such as PMI, of a financially responsible party) and in the process of collection.
	Troubled Debt Restructurings
	The table below presents our recorded investment balance in Troubled Debt Restructurings (TDR) as of the dates presented.
	As of		September 30, 2014				December 31, 2013
	Performing		$	44			$	16
Nonperforming		26				43
Total		$	70			$	59
The following table shows the troubled debt restructurings we made on our conventional MPF Loans for the periods presented. The amounts were the same pre- and post-modification as we did not record any write-offs of principal.
		For the three months ended September 30,								For the nine months ended September 30,
		2014				2013				2014			2013
TDRs made during the periods		$	10			$	8			$	25		$	27
The following table shows the troubled debt restructurings from the previous 12 months that subsequently defaulted during the periods presented. A borrower is considered to have defaulted on a TDR if a contractually due principal or interest payment is sixty days past due at any time during the past 12 months.
		For the three months ended September 30,								For the nine months ended September 30,
		2014				2013				2014			2013
TDRs from the previous 12 months that subsequently defaulted during the periods		$	17			$	15			$	19		$	17
Individually Evaluated Impaired Loans
The following table summarizes the recorded investment, unpaid principal balance, and related allowance of impaired MPF Loans individually assessed for impairment, which includes impaired collateral dependent MPF Loans and TDRs. We had no impaired MPF Loans without an allowance for either date.
As of		September 30, 2014				December 31, 2013
Recorded Investment		$	172			$	215
Unpaid Principal Balance		170				210
Related Allowance		12				22
The following table summarizes the average recorded investment of impaired conventional MPF Loans. No interest income was recognized on impaired loans.
		For the three months ended								For the nine months ended
		30-Sep-14				30-Sep-13				30-Sep-14			30-Sep-13
Average Recorded Investment		$	176			$	219			$	190		$	218
Term Federal Funds Sold
We evaluate Federal Funds Sold for purposes of determining whether or not an allowance for credit losses should be recorded only if repayment of the contractual amount is past due. All Federal Funds sold were repaid according to the contractual terms, and accordingly, we have not recorded any allowance for credit losses as of September 30, 2014.

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivatives and Hedging Activities [Text Block]	'
	Derivatives and Hedging Activities
	Refer to Note 2 - Summary of Significant Accounting Polices to the financial statements in our 2013 Form 10-K for our accounting policies for derivatives.
	We transact most of our derivatives with large banks and major broker-dealers. Some of these banks and broker-dealers or their affiliates buy, sell, and distribute consolidated obligations. Derivative transactions may be entered into through an over-the-counter bilateral agreement with an individual counterparty. Additionally, we clear derivatives transactions through an FCM with a derivatives clearing organization (clearinghouse). We are not a derivatives dealer and do not trade derivatives for speculative purposes.
	Managing Credit Risk on Derivative Agreements
	We are subject to credit risk due to the risk of nonperformance by counterparties to our derivative agreements. For bilateral derivative agreements, the degree of counterparty risk depends on the extent to which master netting arrangements are included in such contracts to mitigate the risk. We manage counterparty credit risk through credit analysis, collateral requirements and adherence to the requirements set forth in our policies and FHFA regulations. We require collateral agreements on all derivatives that establish collateral delivery thresholds. Additionally, collateral related to derivatives with member institutions includes collateral assigned to us, as evidenced by a written security agreement, and held by the member institution for our benefit. Based on credit analyses and collateral requirements, we do not anticipate any credit losses on our derivative agreements. See Note 17 - Fair Value Accounting to the financial statements in our 2013 10-K for discussion regarding our fair value methodology for derivative assets and liabilities, including an evaluation of the potential for the fair value of these instruments to be affected by counterparty credit risk.
	Our over-the-counter bilateral derivative agreements contain provisions that require us to post additional collateral with our counterparties if there is deterioration in our credit rating, except for those derivative agreements with a zero unsecured collateral threshold for both parties, in which case positions are required to be fully collateralized regardless of credit rating. If our credit rating is lowered by a major credit rating agency, such as Standard and Poor's or Moody’s, we would be required to deliver additional collateral on derivatives in net liability positions. If our credit rating had been lowered from its current rating to the next lower rating, we would have been required to deliver up to an additional $48 million of collateral at fair value to our derivatives counterparties at September 30, 2014.
	Cleared swaps are subject to initial and variation margin requirements established by the clearinghouse and its clearing members. We post initial and variation margin through the clearing member, on behalf of the clearinghouse, which could expose us to institutional credit risk in the event that a clearing member or the clearinghouse fail to meet their obligations. Clearing derivatives through a clearinghouse mitigates counterparty credit risk exposure because a central clearinghouse counterparty is substituted for individual counterparties and collateral is posted daily for changes in the value of cleared derivatives through an FCM. The clearinghouse determines initial margin requirements for cleared derivatives. In this regard, clearing agents may require additional initial margin to be posted based on credit considerations, including but not limited to, credit rating downgrades.  We were not required to post additional initial margin by our clearing agents at September 30, 2014.
	We present our derivative assets and liabilities on a net basis in our statements of condition. Refer to Note 1 - Background and Basis of Presentation for further discussion. In addition to the cash collateral as noted in the following table, we also pledged $58 million of investment securities, of which $4 million can be sold or repledged, as part of our initial margin related to cleared derivative transactions at September 30, 2014.
	The following table presents our gross and net derivative assets and liabilities by contract type and amount for our derivative agreements.
			September 30, 2014										31-Dec-13
	As of		Notional Amount			Derivative Assets			Derivative Liabilities				Notional Amount			Derivative Assets			Derivative Liabilities
	Derivatives in hedge accounting relationships-
	Interest rate swaps		$	31,386		$	53		$	1,323			$	28,346		$	85		$	1,670
	Derivatives not in hedge accounting relationships-
	Interest rate swaps		19,243			455			276				14,199			440			286
	Interest rate swaptions		2,315			48			—				4,465			60			—
	Interest rate caps or floors		1,164			110			—				1,164			143			—
	Interest rate futures		41			—			—				—			—			—
	Mortgage delivery commitments		304			3			3				203			3			3
	Derivatives not in hedge accounting relationships		23,067			616			279				20,031			646			289
	Derivative amount before adjustments		$	54,453		669			1,602				$	48,377		731			1,959
	Netting adjustments (excluding cash collateral)					(617		)	(617		)					(677		)	(677		)
	Exposure at fair value					52			985							54			1,282
	Cash collateral (and related accrued interest)					(22		)	(931		)					(19		)	(1,174		)
	Total derivatives on statements of condition					$	30		$	54						$	35		$	108
	The following table presents our gross recognized amount of offsetting derivative assets and liabilities for derivatives with legal right of offset as well as derivatives (i.e., mortgage delivery commitments) without the legal right of offset. At September 30, 2014, we had $4 million of additional net credit exposure on cleared derivatives due to instances where our pledged non-cash collateral to a counterparty exceeded our net derivative liability position. We had no comparable exposure at December 31, 2013.
			Derivative Assets										Derivative Liabilities
	As of September 30, 2014		Bilateral			Cleared			Total				Bilateral			Cleared			Total
	Derivatives with legal right of offset -
	Gross recognized amount		$	637		$	29		$	666			$	1,460		$	139		$	1,599
	Netting adjustments and cash collateral		(611		)	(28		)	(639		)		(1,409		)	(139		)	(1,548		)
	Derivatives with legal right of offset - net		26			1			27				51			—			51
	Derivatives without legal right of offset		3			—			3				3			—			3
	Total derivatives on statements of condition		29			1			30				54			—			54
	Cash collateral for initial margin		—			1			1
	Noncash collateral pledged (received)		(25		)	54			29				—			—			—
	Net amount		$	4		$	56		$	60		a	$	54		$	—		$	54		a
	As of December 31, 2013
	Derivatives with legal right of offset -
	Gross recognized amount		$	707		$	21		$	728			$	1,949		$	7		$	1,956
	Netting adjustments and cash collateral		(676		)	(20		)	(696		)		(1,845		)	(6		)	(1,851		)
	Derivatives with legal right of offset - net		31			1			32				104			1			105
	Derivatives without legal right of offset		3			—			3				3			—			3
	Total derivatives on statements of condition		34			1			35				107			1			108
	Noncash collateral pledged (received)		(31		)	—			(31		)		—			—			—
	Net amount		$	3		$	1		$	4		a	$	107		$	1		$	108		a
	a	Any over-collateralization received by or paid from us to an individual clearing member and/or at a counterparty arrangement level is not included in the determination of the net amount.  Specifically, any such over-collateralization amount received by us is not offset against another derivative asset counterparty exposure for which there is no legal right of offset, while any over-collateralization delivered by us is not offset against another derivative liability counterparty exposure for which there is no legal right of offset.
	The tables below present the gain (loss) components of derivatives and hedging activities as presented in the statements of income.
			Three months ended September 30,						Nine months ended September 30,
	For the periods ending		2014			2013			2014				2013
	Fair value hedges -
	Interest rate swaps		$	(3	)	$	2		$	(15	)		$	13
	Fair value hedges		(3		)	2			(15		)		13
	Cash flow hedges		—			1			1				4
	Economic hedges -
	Interest rate swaps		1			(2		)	(2		)		62
	Interest rate swaptions		(4		)	(20		)	(20		)		(37		)
	Interest rate caps or floors		(17		)	(7		)	(32		)		(65		)
	Mortgage delivery commitments		1			—			2				1
	Net interest settlements		23			15			55				41
	Economic hedges		4			(14		)	3				2
	Gains (losses) on derivatives and hedging activities		$	1		$	(11	)	$	(11	)		$	19
	Fair Value Hedges
The following table presents, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair value hedging relationships and the effect of those derivatives on our net interest income.
		Gain (loss)										Net Interest Settlements Classified in Net Interest Income a			Hedge Adjustments Amortized into Net Interest Income b
		On Derivative			On Hedged Item			Total Ineffectiveness Recognized in Derivatives and Hedging Activities
Three months ended
September 30, 2014
Hedged item type -
Available-for-sale securities		$	50		$	(50	)	$	—			$	(35	)	$	—
Advances		7			(5		)	2				(20		)	(1		)
MPF Loans held for portfolio		—			—			—				—			(4		)
Consolidated obligation bonds		(57		)	52			(5		)		63			(1		)
Total		$	—		$	(3	)	$	(3	)		$	8		$	(6	)
Three months ended
September 30, 2013
Hedged item type -
Available-for-sale securities		$	7		$	(6	)	$	1			$	(35	)	$	—
Advances		10			(9		)	1				(16		)	9
MPF Loans held for portfolio		—			—			—				—			(8		)
Consolidated obligation bonds		37			(37		)	—				62			(5		)
Total		$	54		$	(52	)	$	2			$	11		$	(4	)
Nine months ended
September 30, 2014
Hedged item type -
Available-for-sale securities		$	20		$	(23	)	$	(3	)		$	(105	)	$	—
Advances		(56		)	62			6				(60		)	(3		)
MPF Loans held for portfolio		—			—			—				—			(13		)
Consolidated obligation bonds		225			(243		)	(18		)		189			(11		)
Total		$	189		$	(204	)	$	(15	)		$	24		$	(27	)
Nine months ended
September 30, 2013
Hedged item type -
Available-for-sale securities		$	241		$	(233	)	$	8			$	(104	)	$	—
Advances		108			(101		)	7				(50		)	7
MPF Loans held for portfolio		—			—			—				—			(27		)
Consolidated obligation bonds		(379		)	377			(2		)		164			(18		)
Total		$	(30	)	$	43		$	13			$	10		$	(38	)
a	Represents the effect of net interest settlements attributable to existing derivative hedging instruments on net interest income. The effect of derivatives on net interest income is included in the interest income/expense line item of the respective hedged item type.
b	Amortization of hedge adjustments is included in the interest income/expense line item of the respective hedged item type.
Cash Flow Hedges
The following table presents our gains (losses) on our cash-flow hedging relationships recorded in income and other comprehensive income (loss). In cases where amounts are insignificant in the aggregate, we do not report a balance.
		Amortization of Effective Portion Reclassified From AOCI to Interest			Ineffective Portion Reclassified to Derivatives and Hedging Activities			Total Reclassified Into Statements of Income				Effective Portion Recorded in AOCI			Net Change in OCI			Net Interest Settlements Classified in Net Interest Income
Three months ended September 30, 2014
Advances -		$	4		$	—		$	4			$	—		$	(4	)	$	—
interest rate floors
Discount notes -		(1		)	—			(1		)		87			88			(62		)	a
interest rate swaps
Bonds -		(1		)	—			(1		)		—			1			—
interest rate swaps
Total		$	2		$	—		$	2			$	87		$	85		$	(62	)	a
Three months ended September 30, 2013
Advances -		$	3		$	—		$	3			$	—		$	(3	)	$	—
interest rate floors
Discount notes -		(1		)	1			—				21			21			(66		)	a
interest rate swaps
Bonds -		(1		)	—			(1		)		—			1			—
interest rate swaps
Total		$	1		$	1		$	2			$	21		$	19		$	(66	)	a
Nine months ended September 30, 2014
Advances -		$	9		$	—		$	9			$	—		$	(9	)	$	—
interest rate floors
Discount notes -		(2		)	1			(1		)		97			98			(184		)	a
interest rate swaps
Bonds -		(2		)	—			(2		)		—			2			—
interest rate swaps
Total		$	5		$	1		$	6			$	97		$	91		$	(184	)	a
Nine months ended September 30, 2013
Advances -		$	10		$	—		$	10			$	—		$	(10	)	$	—
interest rate floors
Discount notes -		(1		)	—			(1		)		—			1			—
interest rate caps
Discount notes -		(2		)	4			2				348			346			(200		)	a
interest rate swaps
Bonds -		(2		)	—			(2		)		—			2			—
interest rate swaps
Total		$	5		$	4		$	9			$	348		$	339		$	(200	)	a
a	Represents the effect of net interest settlements attributable to open derivative hedging instruments on net interest income. The effect of derivatives on net interest income is included in the interest income/expense line item of the respective hedged item type.
There were no amounts reclassified from AOCI into earnings for the periods presented as a result of the discontinuance of cash-flow hedges because the original forecasted transactions failed to occur by the end of the originally specified time period or within a two-month period thereafter. The deferred net gains (losses) on derivative instruments in AOCI that are expected to be reclassified to earnings during the next twelve months were $8 million as of September 30, 2014. The maximum length of time over which we are hedging our exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, is 6 years.

Consolidated_Obligations

Consolidated Obligations	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Consolidated Obligations [Text Block]	'
	Consolidated Obligations
	The following table presents our consolidated obligation bonds, for which we are the primary obligor, including callable bonds that are redeemable in whole, or in part, at our discretion on predetermined call dates.
	As of September 30, 2014	Contractual Maturity			Weighted Average Interest Rate			By Next Maturity or Call Date
	Due in one year or less	$	3,652		1.39	%		$	26,789
	One to two years	3,925			2.89	%		3,515
	Two to three years	5,980			1.9	%		1,948
	Three to four years	5,072			1.56	%		1,200
	Four to five years	4,829			1.56	%		833
	Thereafter	12,021			2.25	%		1,194
	Total par value	$	35,479		1.98	%		$	35,479
	The following table presents our consolidated obligation discount notes for which we are the primary obligor. All are due in one year or less.
	As of	30-Sep-14			December 31, 2013
	Carrying Amount	$	30,507		$	31,089
	Par Value	30,512			31,092
	Weighted Average Interest Rate	0.06		%	0.07		%
	The following table presents consolidated obligation bonds outstanding by call feature:
	As of	30-Sep-14			31-Dec-13
	Noncallable	$	11,477		$	12,927
	Callable	24,002			19,565
	Par value	35,479			32,492
	Bond premiums (discounts), net	19			20
	Hedging adjustments	(272		)	(526		)
	Fair value option adjustments	13			1
	Total consolidated obligation bonds	$	35,239		$	31,987
	Joint and Several Liability
	The FHFA, at its discretion, may require an FHLB to make principal or interest payments due on any consolidated obligation. Although it has never occurred, to the extent that an FHLB makes a payment on a consolidated obligation on behalf of another FHLB, the paying FHLB would be entitled to a reimbursement from the non-complying FHLB. If the FHFA determines that the non-complying FHLB is unable to satisfy its direct obligations (as primary obligor), then the FHFA may allocate the outstanding liability among the remaining FHLBs on a pro rata basis in proportion to each FHLB's participation in all consolidated obligations outstanding, or on any other basis the FHFA may prescribe, even in the absence of a default event by the primary obligor. The FHFA is required but has not notified us that we would be required to pay any consolidated obligation on behalf of another FHLB. Accordingly, we do not expect to pay any additional amounts on behalf of other FHLBs under our joint and several liability as of September 30, 2014. As a result, we did not accrue a liability for our joint and several liability related to the other FHLBs’ share of the consolidated obligations as of September 30, 2014 and December 31, 2013.
	The following table summarizes the consolidated obligations of the FHLBs and those for which we are the primary obligor:
		September 30, 2014										31-Dec-13
	Par values as of	Bonds			Discount				Total			Bonds			Discount			Total
					Notes										Notes
	FHLB System total consolidated obligations	$	489,270		$	327,680			$	816,950		$	473,495		$	293,342		$	766,837
	FHLB Chicago as primary obligor	35,479			30,512				65,991			32,492			31,092			63,584
	As a percent of the FHLB System	7		%	9		%		8		%	7		%	11		%	8		%

Capital_and_Mandatorily_Redeem

Capital and Mandatorily Redeemable Capital Stock	9 Months Ended
	Sep. 30, 2014
Capital [Abstract]	'
Capital Stock and Mandatorily Redeemable Capital Stock [Text Block]	'
	Capital and Mandatorily Redeemable Capital Stock
	Capital Rules
	Under our capital plan our stock consists of two sub-classes of stock, Class B1 stock and Class B2 stock (together, Class B stock), both with a par value of $100 and redeemable on five years' written notice, subject to certain conditions. Under the capital plan, each member is required to own capital stock in an amount equal to the greater of a membership stock requirement or an activity stock requirement. Class B1 stock is available for purchase only to support a member's activity stock requirement. Class B2 stock is available to be purchased to support a member's membership stock requirement and any activity stock requirement.
	Under our capital plan, our Board of Directors may set a threshold of between $5 million and $250 million on the amount of Class B2 stock that would otherwise be held for membership if a member has advances outstanding that have an activity stock requirement in excess of the threshold amount. In that case, the amount of Class B2 stock that exceeds such threshold and is necessary to support advance activity is automatically converted into Class B1 stock. This threshold is currently set at $5 million, which means that we will convert to Class B1 capital stock any capital stock supporting advances that exceeds the lesser of the member's membership requirement or $5 million.
	The Board of Directors may periodically adjust members' activity stock requirement for certain new advances within a range of 2% and 6% of a member's outstanding advances. During 2013, our Board implemented this provision for the first time through a Reduced Capitalization Advance Program (RCAP) as further discussed in Note 14 - Capital and Mandatorily Redeemable Capital Stock to the financial statements in our 2013 Form 10-K. A second offering of up to $5 billion in advances under RCAP began on August 15, 2014 and will expire on November 17, 2014. The second offering allows members to borrow one or more advances with an activity stock requirement of 2% for the life of the advance instead of the 5% requirement under our capital plan's provisions, if the new advances represent an incremental increase in member's overall level of advances and had maturity dates of at least one year. Each member's activity stock requirement remains at 5% for non-RCAP advances.
	Finally, under the capital plan, the cap on the membership stock requirement for each member is now $165.3 million. Under the plan, the cap on membership stock is equal to the lesser of (1) a cap set by the Board within a range of $25 million and $250 million, and (2) 9.9% of our total capital stock outstanding as of the prior December 31. Although the Board set an initial cap of $250 million, the operative cap under the plan of $165.3 million is based on the level of the Bank's capital stock at December 31, 2013 unless the Board sets a new cap.
	Membership stock requirements will continue to be recalculated annually, whereas the activity stock requirement and any automatic conversion of Class B2 stock to Class B1 stock related to the $5 million threshold will apply on a daily basis. We may only redeem or repurchase capital stock from a member if, following the redemption or repurchase, the member will continue to meet its minimum investment requirement and we remain in compliance with our regulatory capital requirements.
	Our current practice is to repurchase excess capital stock held by members within three business days of receiving a repurchase request, subject to regulatory requirements and prudent business practices. During the third quarter, all capital stock repurchases were made within three business days of receipt of the requests.
	Minimum Capital Requirements
	For details on our minimum capital requirements, including how the ratios below were calculated, see Minimum Capital Requirements on page F-47 of our 2013 Form 10-K. We complied with our minimum regulatory capital requirements as shown below:
		September 30, 2014						December 31, 2013
		Requirement			Actual			Requirement			Actual
	Risk-based capital	$	1,184		$	4,110		$	1,465		$	3,703
	Total regulatory capital	$	2,881		$	4,110		$	2,752		$	3,703
	Total regulatory capital ratio	4		%	5.71		%	4		%	5.38		%
	Leverage capital	$	3,602		$	6,164		$	3,440		$	5,555
	Leverage capital ratio	5		%	8.56		%	5		%	8.07		%
	Total regulatory capital and leverage capital do not include accumulated other comprehensive income (loss). Under the FHFA regulation on capital classifications and critical capital levels for the FHLBs, we are adequately capitalized.
	Mandatorily Redeemable Capital Stock
	We reclassify capital stock from equity to mandatorily redeemable capital stock (MRCS) in our statements of condition under conditions as further described in Mandatorily Redeemable Capital Stock on page F-48 in our 2013 Form 10-K.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Comprehensive Income (Loss) Note [Text Block]	'
	Accumulated Other Comprehensive Income (Loss)
	The following table summarizes the income (loss) in AOCI for the periods indicated:
		Available-for-sale						Held-to-maturity						Net Unrealized on Cash Flow Hedges			Post-Retirement Plans				Total AOCI
		Net Unrealized Gain (Loss)			Non-credit OTTI			Net Unrealized Gain (Loss)			Non-credit OTTI
	Three months ended September 30, 2014
	Beginning balance	$	1,188		$	—		$	(1	)	$	(292	)	$	(659	)	$	4			$	240
	Change in the period before reclassifications to net income	(99		)	—			—			15			87			(2		)		1
	Period amounts reclassified to:
	Net interest income	—			—			—			—			(2		)	—			2	(2		)
	Net change in the period	(99		)	—			—			15			85			(2		)	5	(1		)
	Ending balance	$	1,089		$	—		$	(1	)	$	(277	)	$	(574	)	$	2			$	239
	Three months ended September 30, 2013
	Beginning balance	$	1,139		$	—		$	(2	)	$	(350	)	$	(758	)	$	2			$	31
	Change in the period before reclassifications to net income	(13		)	—			—			15			21			—				23
	Period amounts reclassified to:
	Net interest income	—			—			1			—			(1		)	—				—
	Non-interest gain (loss)	—			—			—			—			(1		)	—				(1		)
	Non-interest expense	—			—			—			—			—			(1		)		(1		)
	Net change in the period	(13		)	—			1			15			19			(1		)		21
	Ending balance	$	1,126		$	—		$	(1	)	$	(335	)	$	(739	)	$	1			$	52
	Nine months ended September 30, 2014
	Beginning balance	$	1,052		$	—		$	(1	)	$	(320	)	$	(665	)	$	1			$	67
	Change in the period before reclassifications to net income	37			—			—			43			97			—				177
	Period amounts reclassified to:
	Net interest income	—			—			—			—			(5		)	—				(5		)
	Non-interest gain (loss)	—			—			—			—			(1		)	—				(1		)
	Non-interest expense	—			—			—			—			—			1				1
	Net change in the period	37			—			—			43			91			1				172
	Ending balance	$	1,089		$	—		$	(1	)	$	(277	)	$	(574	)	$	2			$	239
	Nine months ended September 30, 2013
	Beginning balance	$	1,576		$	(8	)	$	(3	)	$	(381	)	$	(1,078	)	$	1			$	107
	Change in the period before reclassifications to net income	(450		)	8			—			46			348			—				(48		)
	Period amounts reclassified to:
	Net interest income	—			—			2			—			(5		)	—				(3		)
	Non-interest gain (loss)	—			—			—			—			(4		)	—				(4		)
	Net change in the period	(450		)	8			2			46			339			—				(55		)
	Ending balance	$	1,126		$	—		$	(1	)	$	(335	)	$	(739	)	$	1			$	52

Fair_Value_Accounting

Fair Value Accounting	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Accounting [Text Block]	'
	Fair Value Accounting
	For accounting policies regarding fair values see Note 2 - Summary of Significant Accounting Policies to the financial statements in our 2013 Form 10-K. For a description of the valuation techniques and significant inputs see Note 17 - Fair Value Accounting to the financial statements in our 2013 Form 10-K. There have been no significant changes in our valuation techniques since then. We had no transfers between Levels 1, 2, and/or 3 for the periods presented.
	The tables below are a summary of the fair value estimates and related levels in the fair value hierarchy. The carrying amounts are as recorded in the statements of condition. These tables do not represent an estimate of our overall market value as a going concern; as they do not take into account future business opportunities and future net profitability of assets and liabilities.  The tables below are presented in the following order:
	•	Fair values of financial instruments not measured at fair value on a recurring or nonrecurring basis on our statements of condition.
	•	Financial instruments measured at fair value on a recurring basis on our statements of condition.
	•	Assets measured at fair value on a nonrecurring basis on our statements of condition.
		Carrying Amount								Fair Value Hierarchy
						Fair Value				Level 1				Level 2				Level 3
	September 30, 2014
	Financial Assets-
	Cash and due from banks	$	8,413			$	8,413			$	8,413			$	—			$	—
	Interest bearing deposits	560				560				560				—				—
	Federal Funds sold	1,783				1,783				—				1,783				—
	Held-to-maturity securities	6,685				7,403				—				5,875				1,528
	Advances	26,766				26,875				—				26,875				—
	MPF Loans held in portfolio, net	6,422				6,957				—				6,795				162
	Accrued interest receivable	81				81				—				81				—
	Financial Liabilities-
	Deposits	(530		)		(530		)		—				(530		)		—
	Consolidated obligation discount notes	(30,507		)		(30,507		)		—				(30,507		)		—
	Consolidated obligation bonds	(35,239		)		(35,819		)		—				(35,757		)		(62		)	a
	Accrued interest payable	(200		)		(200		)		—				(200		)		—
	Mandatorily redeemable capital stock	(5		)		(5		)		(5		)		—				—
	Subordinated notes	(944		)		(1,026		)		—				(1,026		)		—
	December 31, 2013
	Financial Assets-
	Cash and due from banks	$	971			$	971			$	971			$	—			$	—
	Federal Funds sold	500				500				—				500				—
	Securities purchased under agreements to resell	4,550				4,550				—				4,550				—
	Held-to-maturity securities	7,917				8,618				—				6,981				1,637
	Advances	23,489				23,586				—				23,586				—
	MPF Loans held in portfolio, net	7,695				8,269				—				8,069				200
	Accrued interest receivable	93				93				—				93				—
	Financial Liabilities-
	Deposits	(544		)		(544		)		—				(544		)		—
	Consolidated obligation discount notes	(31,089		)		(31,089		)		—				(31,089		)		—
	Consolidated obligation bonds	(31,987		)		(32,645		)		—				(32,576		)		(69		)	a
	Accrued interest payable	(137		)		(137		)		—				(137		)		—
	Mandatorily redeemable capital stock	(5		)		(5		)		(5		)		—				—
	Subordinated notes	(944		)		(1,055		)		—				(1,055		)		—
	a	Amount represents debt carried at fair value under a full fair value hedge strategy, not at fair value under the fair value option.
	Financial Instruments Measured at Fair Value on a Recurring Basis
	The following tables present, for each hierarchy level, our assets and liabilities that are measured at fair value on the statements of condition on a recurring basis. Financial instruments carried at fair value on a recurring basis using Level 3 inputs were immaterial at September 30, 2014. We had no Level 1 instruments for either period presented.
	As of September 30, 2014		Level 2				Level 3				Derivative Netting Adjustment and Cash Collateral				Total Fair Value
	Financial assets -
	Trading securities:
	U.S. Government & other government related		$	754			$	—							$	754
	GSE residential MBS		66				—								66
	Governmental-guaranteed residential MBS		2				—								2
	Trading securities		822				—								822
	Available-for-sale securities:
	U.S. Government & other government related		511				—								511
	FFELP ABS		6,444				—								6,444
	GSE residential MBS		10,896				—								10,896
	Government-guaranteed residential MBS		2,454				—								2,454
	Private-label residential MBS		—				74								74
	Available-for-sale securities		20,305				74								20,379
	Advances		73				—								73
	Derivative assets		657				12				$	(639	)	a	30
	Total financial assets at fair value		$	21,857			$	86			$	(639	)		$	21,304
	Level 3 as a percent of total assets at fair value						0.4		%
	Financial liabilities -
	Consolidated obligation discount notes		$	(1,531	)		$	—							$	(1,531	)
Consolidated obligation bonds		$	(3,213	)		$	(62	)	b					$	(3,275	)
Derivative liabilities		(1,602		)		—				$	1,548		a	(54		)
Total financial liabilities at fair value		$	(6,346	)		$	(62	)		$	1,548			$	(4,860	)
Level 3 as a percent of total liabilities at fair value						1.3		%
Table continued on next page.
As of December 31, 2013		Level 2				Level 3				Derivative Netting Adjustment and Cash Collateral				Total Fair Value
Financial assets -
Trading securities:
U.S. Government & other government related		$	1,823			$	—							$	1,823
GSE residential MBS		74				—								74
Governmental-guaranteed residential MBS		2				—								2
Trading securities		1,899				—								1,899
Available-for-sale securities:
U.S. Government & other government related		588				—								588
FFELP ABS		6,803				—								6,803
GSE residential MBS		11,382				—								11,382
Government-guaranteed residential MBS		2,691				—								2,691
Private-label residential MBS		—				72								72
Available-for-sale securities		21,464				72								21,536
Advances		30				—								30
Derivative assets		712				19				$	(696	)	a	35
Total financial assets at fair value		$	24,105			$	91			$	(696	)		$	23,500
Level 3 as a percent of total assets at fair value						0.4		%
Financial liabilities -
Consolidated obligation discount notes		(75		)		—								(75		)
Consolidated obligation bonds		(1,021		)		(69		)	b					(1,090		)
Derivative liabilities		(1,959		)		—				$	1,851		a	(108		)
Total financial liabilities at fair value		$	(3,055	)		$	(69	)		$	1,851			$	(1,273	)
Level 3 as a percent of total liabilities at fair value						5.4		%
a	The netting adjustment amount includes cash collateral (either received or paid by us) and related accrued interest in cases where we have a legal right of setoff, by contract (e.g., master netting agreement) or otherwise, to discharge all or a portion of the debt owed to our counterparty by applying against the debt an amount that our counterparty owes to us. See Note 9 - Derivatives and Hedging Activities for further details.
b	Amount represents debt carried at fair value under a full fair value hedge strategy, not at fair value under the fair value option.
Level 3 Disclosures for Assets and Liabilities that are Measured at Fair Value on a Recurring Basis
There have been no significant changes in assets and liabilities that are measured at fair value on the statements of condition using significant unobservable inputs (Level 3) in the nine months ended September 30, 2014, or 2013.
Assets Measured at Fair Value on a Nonrecurring Basis
Assets measured at fair value on a nonrecurring basis are subject to being measured at fair value as a result of becoming impaired during the reporting period or in the case of REO when fair value declines during the reporting period. If available, broker price opinions are used to measure impaired MPF Loans or REO. If a current broker price opinion is not available, we estimate fair value based on current actual loss severity rates we have incurred on sales, excluding any estimated selling costs. See Note 8 - Allowance for Credit Losses for further details. Significant increases (decreases) in the loss severity rate input in isolation may result in a significantly lower (higher) fair value measurement.
The table below presents assets that are measured at fair value on a nonrecurring basis in our statements of condition only as of the dates shown.
		September 30, 2014				December 31, 2013
		Level 3				Level 3
Impaired MPF Loans		$	162			$	200
Real estate owned		8				10
Non-recurring assets measured at fair value		$	170			$	210
Fair Value Option
We elected the fair value option for advances, discount notes, and consolidated obligation bonds for which hedge accounting treatment may not be achieved. Specifically, hedge accounting may not be achieved in cases where it may be difficult to pass prospective or retrospective effectiveness testing under derivative hedge accounting guidance even though the interest rate swaps used to hedge these financial instruments have matching terms. Accordingly, electing the fair value option allows us to better match the change in fair value of the advance, discount note, and short-term consolidated obligation bonds with the interest rate swap economically hedging it. We determined that no adjustments to the fair values of our instruments recorded under the fair value option for instrument-specific credit risk were necessary as of the dates presented.
The following table summarizes the activity related to financial assets and liabilities for which we elected the fair value option:
	September 30, 2014												September 30, 2013
					Consolidated Obligation												Consolidated Obligation
	Advances				Bonds				Discount Notes				Advances				Bonds				Discount Notes
For the three months ended
Balance beginning of period	$	40			$	(4,235	)		$	—			$	29			$	(2,548	)		$	(75	)
New transactions elected for fair value option	30				(705		)		(1,531		)		—				(330		)		—
Maturities and extinguishments (if any)	—				1,725				—				—				500				—
Net gain (loss) on instruments held at fair value	3				7				—				—				(2		)		—
Change in accrued interest and other	—				(5		)		—				—				(2		)		—
Balance end of period	$	73			$	(3,213	)		$	(1,531	)		$	29			$	(2,382	)		$	(75	)
For the nine months ended
Balance beginning of period	$	30			$	(1,021	)		$	(75	)		$	9			$	(1,251	)		$	—
New transactions elected for fair value option	40				(5,640		)		(1,531		)		20				(2,880		)		(75		)
Maturities and extinguishments (if any)	—				3,450				75				—				1,750				—
Net gain (loss) on instruments held at fair value	3				8				—				—				1				—
Change in accrued interest and other	—				(10		)		—				—				(2		)		—
Balance end of period	$	73			$	(3,213	)		$	(1,531	)		$	29			$	(2,382	)		$	(75	)
The following table reflects the difference between the aggregate unpaid principal balance (UPB) outstanding and the aggregate fair value for advances and consolidated obligation bonds for which the fair value option has been elected. None of the advances were 90 days or more past due and none were on nonaccrual status.
		September 30, 2014												December 31, 2013
As of		Unpaid Principal Balance				Fair				Fair Value Over (Under) UPB				Unpaid Principal Balance				Fair				Fair Value Over (Under) UPB
						Value												Value
Advances		$	70			$	73			$	3			$	29			$	30			$	1
Consolidated obligation bonds		3,200				3,213				13				1,020				1,021				1
Discount notes		1,531				1,531				—				75				75				—

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies [Text Block]	'
	Commitments and Contingencies
	The table below shows our commitments outstanding, which represent off-balance sheet obligations, for the periods presented.
			September 30, 2014								December 31, 2013
	As of		Expire within one year			Expire after one year			Total		Expire within one year			Expire after one year			Total
	Unsettled consolidated obligation bonds		$	941		$	—		$	941	$	220		$	—		$	220
	Unsettled consolidated obligation discount notes		—			—			—		1,000			—			1,000
	Member standby letters of credit		1,463			1,184		a	2,647		1,407			696		a	2,103
	Housing authority standby bond purchase agreements		183			205			388		149			258			407
	MPF Program mortgage purchase commitments		154			—			154		103			—			103
	Unresolved repurchasable loans and indemnifications to Fannie Mae for MPF Xtra loans		59		b	1			60		56		b	—			56
	Committed unused member lines of credit		4,000		c	—			4,000		—			—			—
	Advance commitments		174			109			283		125			101			226
	Commitments		$	6,974		$	1,499		$	8,473	$	3,060		$	1,055		$	4,115
	a	Contains $960 million and $495 million of member standby letters of credit at September 30, 2014, and December 31, 2013, which were renewable annually.
	b	Amount includes only mortgage loans for which (1) a breach of an eligibility requirement or other warranty has been specifically identified and (2) we believe Fannie Mae will request us to repurchase or provide an indemnity. Accordingly, these unresolved requests are classified in the "expire within one year" category. However, these unresolved requests may occur after one year from the reporting date since they do not have an expiration date. If the PFI from which we purchased an ineligible MPF Xtra loan is viable, we may require the PFI to repurchase that loan from us or indemnify us for related losses.  Since we deem it probable that we will recover any losses from the PFIs, we did not recognize a loss in our statement of income related to MPF Xtra loan repurchase or indemnification risk to Fannie Mae.
	c	A committed unused member line of credit is an agreement that provides our members with the option to take multiple advances up to a specified maximum amount, subject to certain conditions. Portions repaid may be reborrowed under the same arrangement.
	For a description of previously defined terms see Note 18 - Commitments and Contingencies to the financial statements in our 2013 Form 10-K.

Transactions_with_Members_and_

Transactions with Members and Other FHLBs	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions Disclosure [Text Block]	'
	Transactions with Members and Other FHLBs
	We define related parties as members that own 10% or more of our capital stock or members whose officers or directors also serve on our Board of Directors. Capital stock ownership is a prerequisite to transacting any member business with us. Members and former members own all of our capital stock.
	In the normal course of business, we extend credit to or enter into other transactions with these related parties. All transactions are done at market terms that are no more favorable than the terms of comparable transactions with other members who are not considered related parties.
	Members
	The table below summarizes balances we had with our members as defined above as related parties (including their affiliates). Members represented in these tables may change between periods presented, to the extent that our related parties change, based on changes in the composition of our Board membership. We had no members at or over the 10% threshold at September 30, 2014; the transactions listed below as of that date were with members whose officers or directors served on our Board. At December 31, 2013, we had one member at or over the 10% threshold, in addition to members whose officers or directors served on our Board.
	As of	September 30, 2014		December 31, 2013
	Assets - Advances	$	153	$	2,546
	Liabilities - Deposits	18		27
	Equity - Capital Stock	17		188
	Other FHLBs
	From time to time, we may loan to, or borrow from, other FHLBs at market rates. These transactions are overnight, maturing the following business day.  Transactions with other FHLBs, if any, are identified on the face of our Financial Statements.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Guarantees, Indemnifications and Warranties Policies [Policy Text Block]	'
	Joint and Several Liability Arrangements
	We adopted new GAAP guidance applicable to joint and several liability arrangements effective January 1, 2014. Under the new guidance, joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date and any additional estimated amount we expect to pay on behalf of other FHLBs is measured and recognized at the reporting date. Transition to the new guidance was done on a retrospective basis. The new guidance did not have an effect on either our current or prior operating activities or financial statements. For further discussion of our joint and several liability see Note 10 - Consolidated Obligations to the financial statements.
Legal Costs, Policy [Policy Text Block]	'
	Litigation Settlement Awards and related Litigation Settlement Legal Expenses
	In the third quarter of 2014 we recognized $1 million in litigation settlement awards, slightly offset by litigation settlement legal expenses. Litigation settlement awards received for the nine months ended September 30, 2014 is $18 million. The awards were recorded in "Non-interest gain (loss) on - Litigation settlement awards". The expenses were recorded in "Non-interest expense - Other". These awards and expenses were recognized when realized. See page F-17 in Note 2 – Summary of Significant Accounting Policies to the financial statements in our 2013 Form 10-K for further details.

Interest_Income_and_Interest_E1

Interest Income and Interest Expense (Tables)	9 Months Ended
	Sep. 30, 2014
Interest Income (Expense), Net [Abstract]	'
Interest Income and Interest Expense [Table Text Block]	'
	The following table presents interest income and interest expense for the periods indicated:
		Three months ended September 30,					Nine months ended September 30,
		2014			2013		2014			2013
	Interest income -
	Federal Funds sold, securities purchased under agreements to resell, and interest bearing deposits	$	2		$	1	$	6		$	7
	Investment securities -
	Trading	6			2		21			11
	Available-for-sale	136			145		415			442
	Held-to-maturity	72			79		223			251
	Total investment securities	214			226		659			704
	Advances -
	Advance interest income	35			37		108			107
	Advance prepayment fees, including related hedge adjustment gains (losses) of $0, $10, $0, and $10	4			17		8			30
	Total Advances	39			54		116			137
	MPF Loans held in portfolio, net	78			92		252			308
	Total interest income	333			373		1,033			1,156
	Interest expense -
	Consolidated obligations -
	Discount notes	68			71		201			222
	Bonds	114			170		408			562
	Total consolidated obligations	182			241		609			784
	Subordinated notes	13			13		40			42
	Total interest expense	195			254		649			826
	Net interest income before provision for credit losses	138			119		384			330
	Reversal of allowance for credit losses	(2		)	—		(8		)	(2		)
	Net interest income	$	140		$	119	$	392		$	332

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Trading Securities by Major Security Type [Table Text Block]	'
	The following table presents the fair value of our trading securities. We had no material gains or losses realized from the sales of trading securities.
	As of		September 30, 2014				December 31, 2013
	U.S. Government & other government related		$	754			$	1,823
	Residential MBS:
	GSE		66				74
	Government-guaranteed		2				2
	Total Residential MBS		68				76
	Trading securities		$	822			$	1,899
	At September 30, 2014, and 2013, we had net year-to-date unrealized gains (losses) of $(4) million and $(11) million on trading securities still held at period end.
Available-for-sale Securities by Major Security Type [Table Text Block]	'
	Amortized Cost Basis and Fair Value – Available-for-Sale Securities (AFS)
		Amortized Cost Basis				Gross Unrealized Gains in AOCI				Gross Unrealized Losses in AOCI				Carrying Amount and Fair Value
	As of September 30, 2014
	U.S. Government & other government related	$	481			$	30			$	—			$	511
	FFELP ABS	6,019				435				(10		)		6,444
	Residential MBS:
	GSE	10,371				531				(6		)		10,896
	Government-guaranteed	2,352				102				—				2,454
	Private-label	67				7				—				74
	Total Residential MBS	12,790				640				(6		)		13,424
	Total	$	19,290			$	1,105			$	(16	)		$	20,379
	As of December 31, 2013
	U.S. Government & other government related	$	560			$	29			$	(1	)		$	588
	FFELP ABS	6,395				425				(17		)		6,803
	Residential MBS:
	GSE	10,888				518				(24		)		11,382
	Government-guaranteed	2,572				119				—				2,691
	Private-label	69				3				—				72
	Total Residential MBS	13,529				640				(24		)		14,145
	Total	$	20,484			$	1,094			$	(42	)		$	21,536
Held-to-maturity Securities by Major Security Type [Table Text Block]	'
	Amortized Cost Basis, Carrying Amount, and Fair Value - Held-to-Maturity Securities (HTM)
		Amortized				Non-credit OTTI Recognized in AOCI (Loss)				Carrying				Gross				Gross			Fair Value
		Cost Basis								Amount				Unrecognized				Unrecognized
														Holding				Holding
														Gains				Losses
	As of September 30, 2014
	U.S. Government & other government related	$	1,618			$	—			$	1,618			$	66			$	(1	)	$	1,683
	State or local housing agency	18				—				18				—				—			18
	Residential MBS:
	GSE	2,793				—				2,793				186				—			2,979
	Government-guaranteed	1,165				—				1,165				30				—			1,195
	Private-label	1,368				(277		)		1,091				438				(1		)	1,528
	Total Residential MBS	5,326				(277		)		5,049				654				(1		)	5,702
	Total	$	6,962			$	(277	)		$	6,685			$	720			$	(2	)	$	7,403
	As of December 31, 2013
	U.S. Government & other government related	$	2,259			$	—			$	2,259			$	42			$	(1	)	$	2,300
	State or local housing agency	22				—				22				—				—			22
	Residential MBS:
	GSE	3,193				—				3,193				186				—			3,379
	Government-guaranteed	1,248				—				1,248				32				—			1,280
	Private-label	1,515				(320		)		1,195				444				(2		)	1,637
	Total Residential MBS	5,956				(320		)		5,636				662				(2		)	6,296
	Total	$	8,237			$	(320	)		$	7,917			$	704			$	(3	)	$	8,618
Securities in a Continuous Unrealized Loss Position [Table Text Block]	'
	The following tables present unrealized temporary losses on our AFS and HTM portfolio for periods less than 12 months and for 12 months or more. We recognized no OTTI charges on these unrealized loss positions because we expect to recover the entire amortized cost basis, we do not intend to sell these securities, and we believe it is more likely than not that we will not be required to sell them prior to recovering their amortized cost basis. In the tables below, in cases where the gross unrealized losses for an investment category are less than $1 million, the losses are not reported.
	Available-for-Sale Securities
		Less than 12 Months								12 Months or More								Total
		Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value			Gross Unrealized Losses
	As of September 30, 2014
	FFELP ABS	$	3			$	—			$	921			$	(10	)		$	924		$	(10	)
	Residential MBS:
	GSE	—				—				2,033				(6		)		2,033			(6		)
	Private-label	—				—				1				—				1			—
	Total Residential MBS	—				—				2,034				(6		)		2,034			(6		)
	Total	$	3			$	—			$	2,955			$	(16	)		$	2,958		$	(16	)
	As of December 31, 2013
	U.S. Government & other government related	$	40			$	(1	)		$	—			$	—			$	40		$	(1	)
	FFELP ABS	22				—				969				(17		)		991			(17		)
	Residential MBS:
	GSE	—				—				3,293				(24		)		3,293			(24		)
	Private-label	—				—				9				—				9			—
	Total Residential MBS	—				—				3,302				(24		)		3,302			(24		)
	Total	$	62			$	(1	)		$	4,271			$	(41	)		$	4,333		$	(42	)
	Held-to-Maturity Securities
		Less than 12 Months								12 Months or More								Total
		Fair Value				Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value			Gross Unrealized Losses
	As of September 30, 2014
	U.S. Government & other government related	$	14			$	—			$	4			$	(1	)		$	18		$	(1	)
	State or local housing agency	10				—				—				—				10			—
	Residential MBS:
	GSE	—				—				5				—				5			—
	Private-label	15				—				1,435				(278		)		1,450			(278		)
	Total Residential MBS	15				—				1,440				(278		)		1,455			(278		)
	Total	$	39			$	—			$	1,444			$	(279	)		$	1,483		$	(279	)
	As of December 31, 2013
	U.S. Government & other government related	$	85			$	(1	)		$	—			$	—			$	85		$	(1	)
	State or local housing agency	10				—				—				—				10			—
	Residential MBS:
	GSE	10				—				—				—				10			—
	Private-label	—				—				1,532				(322		)		1,532			(322		)
	Total Residential MBS	10				—				1,532				(322		)		1,542			(322		)
	Total	$	105			$	(1	)		$	1,532			$	(322	)		$	1,637		$	(323	)
Securities by Contractual Maturity [Table Text Block]	'
	The table below presents the amortized cost basis and fair value of AFS and HTM securities by contractual maturity, excluding ABS and MBS securities. These securities are excluded because their expected maturities may differ from their contractual maturities if borrowers of the underlying loans elect to prepay their loans.
			Available-for-Sale								Held-to-Maturity
	As of September 30, 2014		Amortized Cost Basis				Carrying Amount and Fair Value				Carrying Amount				Fair
															Value
	Year of Maturity -
	Due in one year or less		$	—			$	—			$	175			$	175
	Due after one year through five years		96				101				54				54
	Due after five years through ten years		2				2				395				410
	Due after ten years		383				408				1,012				1,062
	ABS and MBS without a single maturity date		18,809				19,868				5,049				5,702
	Total securities		$	19,290			$	20,379			$	6,685			$	7,403
Total Securities Other-than-Temporarily Impaired during the Life of the Security [Table Text Block]	'
	The table below presents private-label MBS that have incurred OTTI at some point in time since we acquired the security. Each private-label MBS presented below is classified as prime, subprime, or Alt-A. Such classification depends upon the nature of the majority of underlying mortgages collateralizing each private-label MBS based on the issuer's classification, or as published by a nationally recognized statistical rating organization (NRSRO), at the time of issuance of the MBS.
	As of September 30, 2014		Unpaid Principal Balance				Amortized Cost Basis				Non-Credit OTTI				Gross Unrealized Gains				Carrying Amount			Fair Value
	OTTI AFS Securities-
	Private-label residential MBS:
	Alt-A		$	98			$	65			$	—			$	7			$	72		$	72
	OTTI HTM Securities-
	Private-label residential MBS:
	Prime		$	1,051			$	828			$	(203	)		$	—			$	625		$	895
	Subprime		652				407				(74		)		—				333			500
	Total OTTI HTM securities		$	1,703			$	1,235			$	(277	)		$	—			$	958		$	1,395
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]	'
	The following table presents the changes in the cumulative amount of credit losses (recognized into earnings) on OTTI investment securities for the periods stated.
			Three months ended September 30,									Nine months ended September 30,
			2014					2013				2014				2013
	Beginning Balance		$	649				$	701			$	677			$	717
	Reductions:					3
	Increases in cash flows expected to be collected that have been recognized as accretion into net interest income		(15		)	5		(11		)		(43		)		(27		)
	Ending Balance		$	634				$	690			$	634			$	690

Advances_Tables

Advances (Tables)	9 Months Ended
	Sep. 30, 2014
Federal Home Loan Banks [Abstract]	'
Schedule of Advances by Callable and Putable Features [Table Text Block]	'
	We offer a wide range of fixed- and variable-rate advance products with different maturities, interest rates, payment characteristics and optionality. We did not have any advances with embedded features that met the requirements to separate the embedded feature from the host contract and designate the embedded feature as a stand-alone derivative at September 30, 2014, and December 31, 2013. The following table presents our advances by callable/putable features:
	As of		September 30, 2014		December 31, 2013
	Noncallable/nonputable		$	23,985	$	20,259
	Callable		964		1,440
	Putable		1,699		1,726
	Total par value		26,648		23,425
	Hedging adjustments		98		39
	Other adjustments		20		25
	Total advances		$	26,766	$	23,489
Advances by Year of Contractual Maturity, Next Call Date, or Next Put or Convert Date [Table Text Block]	'
	The following table presents our advances by redemption terms:
	As of September 30, 2014		Amount		Weighted Average Interest Rate			Next Maturity or Call Date		Next Maturity or Put Date
	Due in one year or less		$	5,571	0.36	%		$	6,533	$	7,269
	One to two years		2,818		1.8	%		2,668		2,089
	Two to three years		1,518		2.74	%		1,360		1,102
	Three to four years		4,377		1.03	%	a	3,900		3,859
	Four to five years		10,776		0.2	%	a	10,604		10,766
	More than five years		1,588		3.05	%		1,583		1,563
	Total par value		$	26,648	0.85	%		$	26,648	$	26,648
	a	Low weighted average interest rate is relatively lower when compared to other categories due to a majority of advances in this category consisting of variable rate advances which are at low current market rates of interest.

MPF_Loans_Tables

MPF Loans (Tables)	9 Months Ended
	Sep. 30, 2014
Mortgage Loans on Real Estate [Abstract]	'
Mortgage Loans Held for Portfolio [Table Text Block]	'
	The following table presents information on MPF Loans held in our portfolio by contractual maturity at the time of purchase. All are fixed-rate. Government is comprised of loans insured by the Federal Housing Administration (FHA) or the Department of Housing and Urban Development (HUD) and loans guaranteed by the Department of Veteran Affairs (VA) or Department of Agriculture Rural Housing Service (RHS).
	As of	September 30, 2014			December 31, 2013
	Medium term (15 years or less)	$	1,222		$	1,672
	Long term (greater than 15 years)	5,138			5,959
	Total unpaid principal balance	6,360			7,631
	Net premiums, credit enhancement and deferred loan fees	24			27
	Hedging adjustments	54			66
	Total before allowance for credit losses	6,438			7,724
	Allowance for credit losses on MPF Loans	(16		)	(29		)
	Total MPF Loans held in portfolio, net	$	6,422		$	7,695
	Conventional mortgage loans	$	4,941		$	5,969
	Government insured mortgage loans	1,419			1,662
	Total unpaid principal balance	$	6,360		$	7,631

Allowance_for_Credit_Losses_Ta

Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Impact of MPF Risk Sharing Structure on Allowance for Credit Losses [Table Text Block]	'
	The table below presents the impact of the MPF Risk Sharing Structure and severity rates on our allowance for credit losses. For detailed definitions of how Total Severity Rate and Credit Loss Severity Rate are calculated, see Loss Severity on page F-31 in our 2013 Form 10-K.
	As of		September 30, 2014				December 31, 2013
	Total Severity Rate		27		%		35		%
	Credit Loss Severity Rate		13		%		19		%
	Total estimated losses outstanding		$	51			$	65
	Less: losses expected to be absorbed by MPF Risk Sharing Structure		(20		)	a	(18		)	a
	Our share of total losses		31				47
	Less: non-credit losses		(16		)		(21		)
	Credit losses		15				26
	Plus: other estimated credit losses in the remaining portfolio		1				3
	Allowance for credit losses on conventional MPF Loans		$	16			$	29
	a	Represents aggregate of credit enhancements across all master commitments expected to be recovered. Credit enhancement from one master commitment may not be used to offset credit losses incurred by another master commitment.
Rollforward of Allowance for Credit Losses on Mortgage Loans [Table Text Block]	'
	The following table presents the changes in the allowance for credit losses on conventional MPF Loans.
			For the three months ended								For the nine months ended
			September 30, 2014				September 30, 2013				September 30, 2014			September 30, 2013
	Balance, beginning of period		$	19			$	34			$	29		$	42
	Losses charged to the allowance		(1		)		(2		)		(5		)	(8		)
	Provision for (reversal of) credit losses		(2		)		—				(8		)	(2		)
	Balance, end of period		$	16			$	32			$	16		$	32
Schedule of Accounts, Notes, Loans and Financing Receivable by Impairment Methodology [Table Text Block]	'
	The following table presents the recorded investment by impairment methodology on conventional MPF Loans.
	As of		September 30, 2014				December 31, 2013
	Specifically identified and individually evaluated for impairment		$	12			$	22
	Homogeneous pools of loans and collectively evaluated for impairment		4				7
	Allowance for credit losses on conventional MPF Loans		$	16			$	29
	Individually evaluated for impairment - with an allowance		$	172			$	215
	Collectively evaluated for impairment		4,855				5,861
	Total recorded investment		$	5,027			$	6,076
Past Due Financing Receivables [Table Text Block]	'
	The table below summarizes our recorded investment in MPF Loans by our key credit quality indicators.
			September 30, 2014											December 31, 2013
	As of		Conventional				Government				Total			Conventional				Government				Total
	Past due 30-59 days		$	141			$	88			$	229		$	165			$	104			$	269
	Past due 60-89 days		38				24				62			50				31				81
	Past due 90 days or more		165				40			a	205			202				151				353
	Total past due		344				152				496			417				286				703
	Total current		4,683				1,291				5,974			5,659				1,401				7,060
	Total recorded investment		$	5,027			$	1,443			$	6,470		$	6,076			$	1,687			$	7,763
	Also in process of foreclosure		$	85			$	12		a	$	97		$	108			$	51			$	159
	Serious delinquency rate	b	3.3		%		2.77		%	a	3.18		%	3.37		%	c	8.94		%	c	4.58		%	c
	Past due 90 days or more still accruing interest	d	$	25			$	40			$	65		$	27			$	151			$	178
	On nonaccrual status		$	176			$	—			$	176		$	221			$	—			$	221
	a	During the third quarter of 2014, as permitted under our MPF Program Guides for Government MPF Loans, one of our servicers elected at their option to repurchase $109 million of their delinquent loans from us at their outstanding unpaid principal balance, rather than continue to advance to us payments of principal and interest when they are not collecting these amounts from the borrower.
	b	MPF Loans that are 90 days or more past due or in the process of foreclosure as a percentage of the total recorded investment.
	c	We corrected an error to adjust the serious delinquency rate of MPF Loans disclosed above as of December 31, 2013, as previously reported in our 2013 Form 10-K and in our Form 10-Q as of March 31, 2014.  The error had no effect on our allowance for credit losses as of December 31, 2013, because this rate was not used when determining our allowance for credit losses.  After evaluating the quantitative and qualitative aspects of these adjustments, we concluded that prior period financial statements were not materially misstated. Further, the error had no effect on our 2014 financial statements.
	d	Consists of MPF Loans that are either government guaranteed or conventional mortgage loans that are well secured (by collateral that have a realizable value sufficient to discharge the debt or by the guarantee or insurance, such as PMI, of a financially responsible party) and in the process of collection.
Troubled Debt Restructurings on Financing Receivables [Table Text Block]	'
	The table below presents our recorded investment balance in Troubled Debt Restructurings (TDR) as of the dates presented.
	As of		September 30, 2014				December 31, 2013
	Performing		$	44			$	16
	Nonperforming		26				43
	Total		$	70			$	59
Schedule of Debtor Troubled Debt Restructuring, Current Period [Table Text Block]	'
	The following table shows the troubled debt restructurings we made on our conventional MPF Loans for the periods presented. The amounts were the same pre- and post-modification as we did not record any write-offs of principal.
			For the three months ended September 30,								For the nine months ended September 30,
			2014				2013				2014			2013
	TDRs made during the periods		$	10			$	8			$	25		$	27
Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods [Table Text Block]	'
	The following table shows the troubled debt restructurings from the previous 12 months that subsequently defaulted during the periods presented. A borrower is considered to have defaulted on a TDR if a contractually due principal or interest payment is sixty days past due at any time during the past 12 months.
			For the three months ended September 30,								For the nine months ended September 30,
			2014				2013				2014			2013
	TDRs from the previous 12 months that subsequently defaulted during the periods		$	17			$	15			$	19		$	17
Individually Evaluated Impaired Loan Statistics by Product Class Level [Table Text Block]	'
	The following table summarizes the recorded investment, unpaid principal balance, and related allowance of impaired MPF Loans individually assessed for impairment, which includes impaired collateral dependent MPF Loans and TDRs. We had no impaired MPF Loans without an allowance for either date.
	As of		September 30, 2014				December 31, 2013
	Recorded Investment		$	172			$	215
	Unpaid Principal Balance		170				210
	Related Allowance		12				22
Impaired Financing Receivables [Table Text Block]	'
	The following table summarizes the average recorded investment of impaired conventional MPF Loans. No interest income was recognized on impaired loans.
			For the three months ended								For the nine months ended
			30-Sep-14				30-Sep-13				30-Sep-14			30-Sep-13
	Average Recorded Investment		$	176			$	219			$	190		$	218

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	'
	The following table presents our gross and net derivative assets and liabilities by contract type and amount for our derivative agreements.
			September 30, 2014										31-Dec-13
	As of		Notional Amount			Derivative Assets			Derivative Liabilities				Notional Amount			Derivative Assets			Derivative Liabilities
	Derivatives in hedge accounting relationships-
	Interest rate swaps		$	31,386		$	53		$	1,323			$	28,346		$	85		$	1,670
	Derivatives not in hedge accounting relationships-
	Interest rate swaps		19,243			455			276				14,199			440			286
	Interest rate swaptions		2,315			48			—				4,465			60			—
	Interest rate caps or floors		1,164			110			—				1,164			143			—
	Interest rate futures		41			—			—				—			—			—
	Mortgage delivery commitments		304			3			3				203			3			3
	Derivatives not in hedge accounting relationships		23,067			616			279				20,031			646			289
	Derivative amount before adjustments		$	54,453		669			1,602				$	48,377		731			1,959
	Netting adjustments (excluding cash collateral)					(617		)	(617		)					(677		)	(677		)
	Exposure at fair value					52			985							54			1,282
	Cash collateral (and related accrued interest)					(22		)	(931		)					(19		)	(1,174		)
	Total derivatives on statements of condition					$	30		$	54						$	35		$	108
Balance Sheet Offsetting [Table Text Block]	'
	The following table presents our gross recognized amount of offsetting derivative assets and liabilities for derivatives with legal right of offset as well as derivatives (i.e., mortgage delivery commitments) without the legal right of offset. At September 30, 2014, we had $4 million of additional net credit exposure on cleared derivatives due to instances where our pledged non-cash collateral to a counterparty exceeded our net derivative liability position. We had no comparable exposure at December 31, 2013.
			Derivative Assets										Derivative Liabilities
	As of September 30, 2014		Bilateral			Cleared			Total				Bilateral			Cleared			Total
	Derivatives with legal right of offset -
	Gross recognized amount		$	637		$	29		$	666			$	1,460		$	139		$	1,599
	Netting adjustments and cash collateral		(611		)	(28		)	(639		)		(1,409		)	(139		)	(1,548		)
	Derivatives with legal right of offset - net		26			1			27				51			—			51
	Derivatives without legal right of offset		3			—			3				3			—			3
	Total derivatives on statements of condition		29			1			30				54			—			54
	Cash collateral for initial margin		—			1			1
	Noncash collateral pledged (received)		(25		)	54			29				—			—			—
	Net amount		$	4		$	56		$	60		a	$	54		$	—		$	54		a
	As of December 31, 2013
	Derivatives with legal right of offset -
	Gross recognized amount		$	707		$	21		$	728			$	1,949		$	7		$	1,956
	Netting adjustments and cash collateral		(676		)	(20		)	(696		)		(1,845		)	(6		)	(1,851		)
	Derivatives with legal right of offset - net		31			1			32				104			1			105
	Derivatives without legal right of offset		3			—			3				3			—			3
	Total derivatives on statements of condition		34			1			35				107			1			108
	Noncash collateral pledged (received)		(31		)	—			(31		)		—			—			—
	Net amount		$	3		$	1		$	4		a	$	107		$	1		$	108		a
	a	Any over-collateralization received by or paid from us to an individual clearing member and/or at a counterparty arrangement level is not included in the determination of the net amount.  Specifically, any such over-collateralization amount received by us is not offset against another derivative asset counterparty exposure for which there is no legal right of offset, while any over-collateralization delivered by us is not offset against another derivative liability counterparty exposure for which there is no legal right of offset.
Derivatives And Hedging Activities as Presented in the Statements of Income [Table Text Block]	'
	The tables below present the gain (loss) components of derivatives and hedging activities as presented in the statements of income.
			Three months ended September 30,						Nine months ended September 30,
	For the periods ending		2014			2013			2014				2013
	Fair value hedges -
	Interest rate swaps		$	(3	)	$	2		$	(15	)		$	13
	Fair value hedges		(3		)	2			(15		)		13
	Cash flow hedges		—			1			1				4
	Economic hedges -
	Interest rate swaps		1			(2		)	(2		)		62
	Interest rate swaptions		(4		)	(20		)	(20		)		(37		)
	Interest rate caps or floors		(17		)	(7		)	(32		)		(65		)
	Mortgage delivery commitments		1			—			2				1
	Net interest settlements		23			15			55				41
	Economic hedges		4			(14		)	3				2
	Gains (losses) on derivatives and hedging activities		$	1		$	(11	)	$	(11	)		$	19
Fair Value Hedges [Table Text Block]	'
	The following table presents, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair value hedging relationships and the effect of those derivatives on our net interest income.
			Gain (loss)										Net Interest Settlements Classified in Net Interest Income a			Hedge Adjustments Amortized into Net Interest Income b
			On Derivative			On Hedged Item			Total Ineffectiveness Recognized in Derivatives and Hedging Activities
	Three months ended
	September 30, 2014
	Hedged item type -
	Available-for-sale securities		$	50		$	(50	)	$	—			$	(35	)	$	—
	Advances		7			(5		)	2				(20		)	(1		)
	MPF Loans held for portfolio		—			—			—				—			(4		)
	Consolidated obligation bonds		(57		)	52			(5		)		63			(1		)
	Total		$	—		$	(3	)	$	(3	)		$	8		$	(6	)
	Three months ended
	September 30, 2013
	Hedged item type -
	Available-for-sale securities		$	7		$	(6	)	$	1			$	(35	)	$	—
	Advances		10			(9		)	1				(16		)	9
	MPF Loans held for portfolio		—			—			—				—			(8		)
	Consolidated obligation bonds		37			(37		)	—				62			(5		)
	Total		$	54		$	(52	)	$	2			$	11		$	(4	)
	Nine months ended
	September 30, 2014
	Hedged item type -
	Available-for-sale securities		$	20		$	(23	)	$	(3	)		$	(105	)	$	—
	Advances		(56		)	62			6				(60		)	(3		)
	MPF Loans held for portfolio		—			—			—				—			(13		)
	Consolidated obligation bonds		225			(243		)	(18		)		189			(11		)
	Total		$	189		$	(204	)	$	(15	)		$	24		$	(27	)
	Nine months ended
	September 30, 2013
	Hedged item type -
	Available-for-sale securities		$	241		$	(233	)	$	8			$	(104	)	$	—
	Advances		108			(101		)	7				(50		)	7
	MPF Loans held for portfolio		—			—			—				—			(27		)
	Consolidated obligation bonds		(379		)	377			(2		)		164			(18		)
	Total		$	(30	)	$	43		$	13			$	10		$	(38	)
	a	Represents the effect of net interest settlements attributable to existing derivative hedging instruments on net interest income. The effect of derivatives on net interest income is included in the interest income/expense line item of the respective hedged item type.
	b	Amortization of hedge adjustments is included in the interest income/expense line item of the respective hedged item type.
Cash Flow Hedges [Table Text Block]	'
	The following table presents our gains (losses) on our cash-flow hedging relationships recorded in income and other comprehensive income (loss). In cases where amounts are insignificant in the aggregate, we do not report a balance.
			Amortization of Effective Portion Reclassified From AOCI to Interest			Ineffective Portion Reclassified to Derivatives and Hedging Activities			Total Reclassified Into Statements of Income				Effective Portion Recorded in AOCI			Net Change in OCI			Net Interest Settlements Classified in Net Interest Income
	Three months ended September 30, 2014
	Advances -		$	4		$	—		$	4			$	—		$	(4	)	$	—
	interest rate floors
	Discount notes -		(1		)	—			(1		)		87			88			(62		)	a
	interest rate swaps
	Bonds -		(1		)	—			(1		)		—			1			—
	interest rate swaps
	Total		$	2		$	—		$	2			$	87		$	85		$	(62	)	a
	Three months ended September 30, 2013
	Advances -		$	3		$	—		$	3			$	—		$	(3	)	$	—
	interest rate floors
	Discount notes -		(1		)	1			—				21			21			(66		)	a
	interest rate swaps
	Bonds -		(1		)	—			(1		)		—			1			—
	interest rate swaps
	Total		$	1		$	1		$	2			$	21		$	19		$	(66	)	a
	Nine months ended September 30, 2014
	Advances -		$	9		$	—		$	9			$	—		$	(9	)	$	—
	interest rate floors
	Discount notes -		(2		)	1			(1		)		97			98			(184		)	a
	interest rate swaps
	Bonds -		(2		)	—			(2		)		—			2			—
	interest rate swaps
	Total		$	5		$	1		$	6			$	97		$	91		$	(184	)	a
	Nine months ended September 30, 2013
	Advances -		$	10		$	—		$	10			$	—		$	(10	)	$	—
	interest rate floors
	Discount notes -		(1		)	—			(1		)		—			1			—
	interest rate caps
	Discount notes -		(2		)	4			2				348			346			(200		)	a
	interest rate swaps
	Bonds -		(2		)	—			(2		)		—			2			—
	interest rate swaps
	Total		$	5		$	4		$	9			$	348		$	339		$	(200	)	a
	a	Represents the effect of net interest settlements attributable to open derivative hedging instruments on net interest income. The effect of derivatives on net interest income is included in the interest income/expense line item of the respective hedged item type.
	There were no amounts reclassified from AOCI into earnings for the periods presented as a result of the discontinuance of cash-flow hedges because the original forecasted transactions failed to occur by the end of the originally specified time period or within a two-month period thereafter. The deferred net gains (losses) on derivative instruments in AOCI that are expected to be reclassified to earnings during the next twelve months were $8 million as of September 30, 2014. The maximum length of time over which we are hedging our exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, is 6 years.

Consolidated_Obligations_Table

Consolidated Obligations (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Schedule of Maturities of Long-term Debt [Table Text Block]	'
	The following table presents our consolidated obligation bonds, for which we are the primary obligor, including callable bonds that are redeemable in whole, or in part, at our discretion on predetermined call dates.
	As of September 30, 2014	Contractual Maturity			Weighted Average Interest Rate			By Next Maturity or Call Date
	Due in one year or less	$	3,652		1.39	%		$	26,789
	One to two years	3,925			2.89	%		3,515
	Two to three years	5,980			1.9	%		1,948
	Three to four years	5,072			1.56	%		1,200
	Four to five years	4,829			1.56	%		833
	Thereafter	12,021			2.25	%		1,194
	Total par value	$	35,479		1.98	%		$	35,479
Consolidated Obligation Discount Notes [Table Text Block]	'
	The following table presents our consolidated obligation discount notes for which we are the primary obligor. All are due in one year or less.
	As of	30-Sep-14			December 31, 2013
	Carrying Amount	$	30,507		$	31,089
	Par Value	30,512			31,092
	Weighted Average Interest Rate	0.06		%	0.07		%
Consolidated Obligation Bonds Outstanding by Call Feature [Table Text Block]	'
	The following table presents consolidated obligation bonds outstanding by call feature:
	As of	30-Sep-14			31-Dec-13
	Noncallable	$	11,477		$	12,927
	Callable	24,002			19,565
	Par value	35,479			32,492
	Bond premiums (discounts), net	19			20
	Hedging adjustments	(272		)	(526		)
	Fair value option adjustments	13			1
	Total consolidated obligation bonds	$	35,239		$	31,987
Schedule of Guarantor Obligations [Table Text Block]	'
	The following table summarizes the consolidated obligations of the FHLBs and those for which we are the primary obligor:
		September 30, 2014										31-Dec-13
	Par values as of	Bonds			Discount				Total			Bonds			Discount			Total
					Notes										Notes
	FHLB System total consolidated obligations	$	489,270		$	327,680			$	816,950		$	473,495		$	293,342		$	766,837
	FHLB Chicago as primary obligor	35,479			30,512				65,991			32,492			31,092			63,584
	As a percent of the FHLB System	7		%	9		%		8		%	7		%	11		%	8		%

Capital_and_Mandatorily_Redeem1

Capital and Mandatorily Redeemable Capital Stock (Tables)	9 Months Ended
	Sep. 30, 2014
Capital [Abstract]	'
Schedule of Minimum Capital Requirements [Table Text Block]	'
	For details on our minimum capital requirements, including how the ratios below were calculated, see Minimum Capital Requirements on page F-47 of our 2013 Form 10-K. We complied with our minimum regulatory capital requirements as shown below:
		September 30, 2014						December 31, 2013
		Requirement			Actual			Requirement			Actual
	Risk-based capital	$	1,184		$	4,110		$	1,465		$	3,703
	Total regulatory capital	$	2,881		$	4,110		$	2,752		$	3,703
	Total regulatory capital ratio	4		%	5.71		%	4		%	5.38		%
	Leverage capital	$	3,602		$	6,164		$	3,440		$	5,555
	Leverage capital ratio	5		%	8.56		%	5		%	8.07		%
	Total regulatory capital and leverage capital do not include accumulated other comprehensive income (loss). Under the FHFA regulation on capital classifications and critical capital levels for the FHLBs, we are adequately capitalized.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	The following table summarizes the income (loss) in AOCI for the periods indicated:
		Available-for-sale						Held-to-maturity						Net Unrealized on Cash Flow Hedges			Post-Retirement Plans				Total AOCI
		Net Unrealized Gain (Loss)			Non-credit OTTI			Net Unrealized Gain (Loss)			Non-credit OTTI
	Three months ended September 30, 2014
	Beginning balance	$	1,188		$	—		$	(1	)	$	(292	)	$	(659	)	$	4			$	240
	Change in the period before reclassifications to net income	(99		)	—			—			15			87			(2		)		1
	Period amounts reclassified to:
	Net interest income	—			—			—			—			(2		)	—			2	(2		)
	Net change in the period	(99		)	—			—			15			85			(2		)	5	(1		)
	Ending balance	$	1,089		$	—		$	(1	)	$	(277	)	$	(574	)	$	2			$	239
	Three months ended September 30, 2013
	Beginning balance	$	1,139		$	—		$	(2	)	$	(350	)	$	(758	)	$	2			$	31
	Change in the period before reclassifications to net income	(13		)	—			—			15			21			—				23
	Period amounts reclassified to:
	Net interest income	—			—			1			—			(1		)	—				—
	Non-interest gain (loss)	—			—			—			—			(1		)	—				(1		)
	Non-interest expense	—			—			—			—			—			(1		)		(1		)
	Net change in the period	(13		)	—			1			15			19			(1		)		21
	Ending balance	$	1,126		$	—		$	(1	)	$	(335	)	$	(739	)	$	1			$	52
	Nine months ended September 30, 2014
	Beginning balance	$	1,052		$	—		$	(1	)	$	(320	)	$	(665	)	$	1			$	67
	Change in the period before reclassifications to net income	37			—			—			43			97			—				177
	Period amounts reclassified to:
	Net interest income	—			—			—			—			(5		)	—				(5		)
	Non-interest gain (loss)	—			—			—			—			(1		)	—				(1		)
	Non-interest expense	—			—			—			—			—			1				1
	Net change in the period	37			—			—			43			91			1				172
	Ending balance	$	1,089		$	—		$	(1	)	$	(277	)	$	(574	)	$	2			$	239
	Nine months ended September 30, 2013
	Beginning balance	$	1,576		$	(8	)	$	(3	)	$	(381	)	$	(1,078	)	$	1			$	107
	Change in the period before reclassifications to net income	(450		)	8			—			46			348			—				(48		)
	Period amounts reclassified to:
	Net interest income	—			—			2			—			(5		)	—				(3		)
	Non-interest gain (loss)	—			—			—			—			(4		)	—				(4		)
	Net change in the period	(450		)	8			2			46			339			—				(55		)
	Ending balance	$	1,126		$	—		$	(1	)	$	(335	)	$	(739	)	$	1			$	52

Fair_Value_Accounting_Tables

Fair Value Accounting (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurement [Table Text Block]	'
	The tables below are a summary of the fair value estimates and related levels in the fair value hierarchy. The carrying amounts are as recorded in the statements of condition. These tables do not represent an estimate of our overall market value as a going concern; as they do not take into account future business opportunities and future net profitability of assets and liabilities.  The tables below are presented in the following order:
	•	Fair values of financial instruments not measured at fair value on a recurring or nonrecurring basis on our statements of condition.
	•	Financial instruments measured at fair value on a recurring basis on our statements of condition.
	•	Assets measured at fair value on a nonrecurring basis on our statements of condition.
		Carrying Amount								Fair Value Hierarchy
						Fair Value				Level 1				Level 2				Level 3
	September 30, 2014
	Financial Assets-
	Cash and due from banks	$	8,413			$	8,413			$	8,413			$	—			$	—
	Interest bearing deposits	560				560				560				—				—
	Federal Funds sold	1,783				1,783				—				1,783				—
	Held-to-maturity securities	6,685				7,403				—				5,875				1,528
	Advances	26,766				26,875				—				26,875				—
	MPF Loans held in portfolio, net	6,422				6,957				—				6,795				162
	Accrued interest receivable	81				81				—				81				—
	Financial Liabilities-
	Deposits	(530		)		(530		)		—				(530		)		—
	Consolidated obligation discount notes	(30,507		)		(30,507		)		—				(30,507		)		—
	Consolidated obligation bonds	(35,239		)		(35,819		)		—				(35,757		)		(62		)	a
	Accrued interest payable	(200		)		(200		)		—				(200		)		—
	Mandatorily redeemable capital stock	(5		)		(5		)		(5		)		—				—
	Subordinated notes	(944		)		(1,026		)		—				(1,026		)		—
	December 31, 2013
	Financial Assets-
	Cash and due from banks	$	971			$	971			$	971			$	—			$	—
	Federal Funds sold	500				500				—				500				—
	Securities purchased under agreements to resell	4,550				4,550				—				4,550				—
	Held-to-maturity securities	7,917				8,618				—				6,981				1,637
	Advances	23,489				23,586				—				23,586				—
	MPF Loans held in portfolio, net	7,695				8,269				—				8,069				200
	Accrued interest receivable	93				93				—				93				—
	Financial Liabilities-
	Deposits	(544		)		(544		)		—				(544		)		—
	Consolidated obligation discount notes	(31,089		)		(31,089		)		—				(31,089		)		—
	Consolidated obligation bonds	(31,987		)		(32,645		)		—				(32,576		)		(69		)	a
	Accrued interest payable	(137		)		(137		)		—				(137		)		—
	Mandatorily redeemable capital stock	(5		)		(5		)		(5		)		—				—
	Subordinated notes	(944		)		(1,055		)		—				(1,055		)		—
	a	Amount represents debt carried at fair value under a full fair value hedge strategy, not at fair value under the fair value option.
Assets and Liabilities Measured at Fair Value on a Recurring Basis [Table Text Block]	'
	The following tables present, for each hierarchy level, our assets and liabilities that are measured at fair value on the statements of condition on a recurring basis. Financial instruments carried at fair value on a recurring basis using Level 3 inputs were immaterial at September 30, 2014. We had no Level 1 instruments for either period presented.
	As of September 30, 2014		Level 2				Level 3				Derivative Netting Adjustment and Cash Collateral				Total Fair Value
	Financial assets -
	Trading securities:
	U.S. Government & other government related		$	754			$	—							$	754
	GSE residential MBS		66				—								66
	Governmental-guaranteed residential MBS		2				—								2
	Trading securities		822				—								822
	Available-for-sale securities:
	U.S. Government & other government related		511				—								511
	FFELP ABS		6,444				—								6,444
	GSE residential MBS		10,896				—								10,896
	Government-guaranteed residential MBS		2,454				—								2,454
	Private-label residential MBS		—				74								74
	Available-for-sale securities		20,305				74								20,379
	Advances		73				—								73
	Derivative assets		657				12				$	(639	)	a	30
	Total financial assets at fair value		$	21,857			$	86			$	(639	)		$	21,304
	Level 3 as a percent of total assets at fair value						0.4		%
	Financial liabilities -
	Consolidated obligation discount notes		$	(1,531	)		$	—							$	(1,531	)
	Consolidated obligation bonds		$	(3,213	)		$	(62	)	b					$	(3,275	)
	Derivative liabilities		(1,602		)		—				$	1,548		a	(54		)
	Total financial liabilities at fair value		$	(6,346	)		$	(62	)		$	1,548			$	(4,860	)
	Level 3 as a percent of total liabilities at fair value						1.3		%
	Table continued on next page.
	As of December 31, 2013		Level 2				Level 3				Derivative Netting Adjustment and Cash Collateral				Total Fair Value
	Financial assets -
	Trading securities:
	U.S. Government & other government related		$	1,823			$	—							$	1,823
	GSE residential MBS		74				—								74
	Governmental-guaranteed residential MBS		2				—								2
	Trading securities		1,899				—								1,899
	Available-for-sale securities:
	U.S. Government & other government related		588				—								588
	FFELP ABS		6,803				—								6,803
	GSE residential MBS		11,382				—								11,382
	Government-guaranteed residential MBS		2,691				—								2,691
	Private-label residential MBS		—				72								72
	Available-for-sale securities		21,464				72								21,536
	Advances		30				—								30
	Derivative assets		712				19				$	(696	)	a	35
	Total financial assets at fair value		$	24,105			$	91			$	(696	)		$	23,500
	Level 3 as a percent of total assets at fair value						0.4		%
	Financial liabilities -
	Consolidated obligation discount notes		(75		)		—								(75		)
	Consolidated obligation bonds		(1,021		)		(69		)	b					(1,090		)
	Derivative liabilities		(1,959		)		—				$	1,851		a	(108		)
	Total financial liabilities at fair value		$	(3,055	)		$	(69	)		$	1,851			$	(1,273	)
	Level 3 as a percent of total liabilities at fair value						5.4		%
	a	The netting adjustment amount includes cash collateral (either received or paid by us) and related accrued interest in cases where we have a legal right of setoff, by contract (e.g., master netting agreement) or otherwise, to discharge all or a portion of the debt owed to our counterparty by applying against the debt an amount that our counterparty owes to us. See Note 9 - Derivatives and Hedging Activities for further details.
	b	Amount represents debt carried at fair value under a full fair value hedge strategy, not at fair value under the fair value option.
Assets Measured at Fair Value on a Nonrecurring Basis [Table Text Block]	'
	The table below presents assets that are measured at fair value on a nonrecurring basis in our statements of condition only as of the dates shown.
			September 30, 2014				December 31, 2013
			Level 3				Level 3
	Impaired MPF Loans		$	162			$	200
	Real estate owned		8				10
	Non-recurring assets measured at fair value		$	170			$	210
Beginning and ending balances reconciliation of assets and liabilities held under fair value option [Table Text Block]	'
	The following table summarizes the activity related to financial assets and liabilities for which we elected the fair value option:
		September 30, 2014												September 30, 2013
						Consolidated Obligation												Consolidated Obligation
		Advances				Bonds				Discount Notes				Advances				Bonds				Discount Notes
	For the three months ended
	Balance beginning of period	$	40			$	(4,235	)		$	—			$	29			$	(2,548	)		$	(75	)
	New transactions elected for fair value option	30				(705		)		(1,531		)		—				(330		)		—
	Maturities and extinguishments (if any)	—				1,725				—				—				500				—
	Net gain (loss) on instruments held at fair value	3				7				—				—				(2		)		—
	Change in accrued interest and other	—				(5		)		—				—				(2		)		—
	Balance end of period	$	73			$	(3,213	)		$	(1,531	)		$	29			$	(2,382	)		$	(75	)
	For the nine months ended
	Balance beginning of period	$	30			$	(1,021	)		$	(75	)		$	9			$	(1,251	)		$	—
	New transactions elected for fair value option	40				(5,640		)		(1,531		)		20				(2,880		)		(75		)
	Maturities and extinguishments (if any)	—				3,450				75				—				1,750				—
	Net gain (loss) on instruments held at fair value	3				8				—				—				1				—
	Change in accrued interest and other	—				(10		)		—				—				(2		)		—
	Balance end of period	$	73			$	(3,213	)		$	(1,531	)		$	29			$	(2,382	)		$	(75	)
Fair Value Option [Table Text Block]	'
	The following table reflects the difference between the aggregate unpaid principal balance (UPB) outstanding and the aggregate fair value for advances and consolidated obligation bonds for which the fair value option has been elected. None of the advances were 90 days or more past due and none were on nonaccrual status.
			September 30, 2014												December 31, 2013
	As of		Unpaid Principal Balance				Fair				Fair Value Over (Under) UPB				Unpaid Principal Balance				Fair				Fair Value Over (Under) UPB
							Value												Value
	Advances		$	70			$	73			$	3			$	29			$	30			$	1
	Consolidated obligation bonds		3,200				3,213				13				1,020				1,021				1
	Discount notes		1,531				1,531				—				75				75				—

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Off-Balance Sheet Commitments [Table Text Block]	'
	The table below shows our commitments outstanding, which represent off-balance sheet obligations, for the periods presented.
			September 30, 2014								December 31, 2013
	As of		Expire within one year			Expire after one year			Total		Expire within one year			Expire after one year			Total
	Unsettled consolidated obligation bonds		$	941		$	—		$	941	$	220		$	—		$	220
	Unsettled consolidated obligation discount notes		—			—			—		1,000			—			1,000
	Member standby letters of credit		1,463			1,184		a	2,647		1,407			696		a	2,103
	Housing authority standby bond purchase agreements		183			205			388		149			258			407
	MPF Program mortgage purchase commitments		154			—			154		103			—			103
	Unresolved repurchasable loans and indemnifications to Fannie Mae for MPF Xtra loans		59		b	1			60		56		b	—			56
	Committed unused member lines of credit		4,000		c	—			4,000		—			—			—
	Advance commitments		174			109			283		125			101			226
	Commitments		$	6,974		$	1,499		$	8,473	$	3,060		$	1,055		$	4,115
	a	Contains $960 million and $495 million of member standby letters of credit at September 30, 2014, and December 31, 2013, which were renewable annually.
	b	Amount includes only mortgage loans for which (1) a breach of an eligibility requirement or other warranty has been specifically identified and (2) we believe Fannie Mae will request us to repurchase or provide an indemnity. Accordingly, these unresolved requests are classified in the "expire within one year" category. However, these unresolved requests may occur after one year from the reporting date since they do not have an expiration date. If the PFI from which we purchased an ineligible MPF Xtra loan is viable, we may require the PFI to repurchase that loan from us or indemnify us for related losses.  Since we deem it probable that we will recover any losses from the PFIs, we did not recognize a loss in our statement of income related to MPF Xtra loan repurchase or indemnification risk to Fannie Mae.
	c	A committed unused member line of credit is an agreement that provides our members with the option to take multiple advances up to a specified maximum amount, subject to certain conditions. Portions repaid may be reborrowed under the same arrangement.

Transactions_with_Members_and_1

Transactions with Members and Other FHLBs (Tables)	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions, by Balance Sheet Grouping [Table Text Block]	'
	The table below summarizes balances we had with our members as defined above as related parties (including their affiliates). Members represented in these tables may change between periods presented, to the extent that our related parties change, based on changes in the composition of our Board membership. We had no members at or over the 10% threshold at September 30, 2014; the transactions listed below as of that date were with members whose officers or directors served on our Board. At December 31, 2013, we had one member at or over the 10% threshold, in addition to members whose officers or directors served on our Board.
	As of	September 30, 2014		December 31, 2013
	Assets - Advances	$	153	$	2,546
	Liabilities - Deposits	18		27
	Equity - Capital Stock	17		188

Interest_Income_and_Interest_E2

Interest Income and Interest Expense (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income -	'	'	'	'
Federal Funds sold, securities purchased under agreements to resell, and interest bearing deposits	$2	$1	$6	$7
Investment securities -	'	'	'	'
Trading	6	2	21	11
Available-for-sale	136	145	415	442
Held-to-maturity	72	79	223	251
Total investment securities	214	226	659	704
Advances -	'	'	'	'
Advance interest income	35	37	108	107
Advance prepayment fees, including related hedge adjustment gains (losses) of $0, $10, $0, and $10	4	17	8	30
Total Advances	39	54	116	137
MPF Loans held in portfolio, net	78	92	252	308
Total interest income	333	373	1,033	1,156
Consolidated obligations -	'	'	'	'
Discount notes	68	71	201	222
Bonds	114	170	408	562
Total consolidated obligations	182	241	609	784
Subordinated notes	13	13	40	42
Total interest expense	195	254	649	826
Net interest income before provision for credit losses	138	119	384	330
Reversal of allowance for credit losses	-2	0	-8	-2
Net interest income	$140	$119	$392	$332

Interest_Income_and_Interest_E3

Interest Income and Interest Expense Parenthetical (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Income Parenthetical [Abstract]	'	'	'	'
Hedge adjustment gains (losses) related to advance prepayment fees	$0	$10	$0	$10

Investment_Securities_Pledged_

Investment Securities (Pledged securities) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	$58	$32

Investment_Securities_Trading_

Investment Securities (Trading Securities) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Trading Securities [Line Items]	'	'
Trading securities	$822	$1,899
U.S. Government & other government related	'	'
Trading Securities [Line Items]	'	'
Trading securities	754	1,823
Residential MBS: | GSE	'	'
Trading Securities [Line Items]	'	'
Trading securities	66	74
Residential MBS: | Government-guaranteed	'	'
Trading Securities [Line Items]	'	'
Trading securities	2	2
Residential MBS: | Total Residential MBS	'	'
Trading Securities [Line Items]	'	'
Trading securities	$68	$76

Investment_Securities_Net_year

Investment Securities (Net year-to-date unrealized gains (losses) trading securities) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Trading Securities, Change in Unrealized Holding Gain (Loss) [Abstract]	'	'
Trading Securities, Change in Unrealized Holding Gain (Loss)	($4)	($11)

Investment_Securities_Availabl

Investment Securities (Available-for-sale Securities) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale Amortized Cost Basis	$19,290	$20,484
Gross Unrealized Gains in AOCI	1,105	1,094
Gross Unrealized Losses in AOCI	-16	-42
Carrying Amount and Fair Value	20,379	21,536
U.S. Government & other government related	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale Amortized Cost Basis	481	560
Gross Unrealized Gains in AOCI	30	29
Gross Unrealized Losses in AOCI	0	-1
Carrying Amount and Fair Value	511	588
FFELP ABS	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale Amortized Cost Basis	6,019	6,395
Gross Unrealized Gains in AOCI	435	425
Gross Unrealized Losses in AOCI	-10	-17
Carrying Amount and Fair Value	6,444	6,803
Residential MBS: | GSE	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale Amortized Cost Basis	10,371	10,888
Gross Unrealized Gains in AOCI	531	518
Gross Unrealized Losses in AOCI	-6	-24
Carrying Amount and Fair Value	10,896	11,382
Residential MBS: | Government-guaranteed	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale Amortized Cost Basis	2,352	2,572
Gross Unrealized Gains in AOCI	102	119
Gross Unrealized Losses in AOCI	0	0
Carrying Amount and Fair Value	2,454	2,691
Residential MBS: | Private-label	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale Amortized Cost Basis	67	69
Gross Unrealized Gains in AOCI	7	3
Gross Unrealized Losses in AOCI	0	0
Carrying Amount and Fair Value	74	72
Residential MBS: | Total Residential MBS	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-Sale Amortized Cost Basis	12,790	13,529
Gross Unrealized Gains in AOCI	640	640
Gross Unrealized Losses in AOCI	-6	-24
Carrying Amount and Fair Value	$13,424	$14,145

Investment_Securities_HeldtoMa

Investment Securities (Held-to-Maturities Securities) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	$6,962	$8,237
Non-credit OTTI Recognized in AOCI (Loss)	-277	-320
Held-to-Maturity Carrying Amount	6,685	7,917
Gross Unrecognized Holding Gains	720	704
Gross Unrecognized Holding Losses	-2	-3
Held-to-Maturity Fair Value	7,403	8,618
U.S. Government & other government related	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	1,618	2,259
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Held-to-Maturity Carrying Amount	1,618	2,259
Gross Unrecognized Holding Gains	66	42
Gross Unrecognized Holding Losses	-1	-1
Held-to-Maturity Fair Value	1,683	2,300
State or local housing agency	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	18	22
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Held-to-Maturity Carrying Amount	18	22
Gross Unrecognized Holding Gains	0	0
Gross Unrecognized Holding Losses	0	0
Held-to-Maturity Fair Value	18	22
Residential MBS: | GSE	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	2,793	3,193
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Held-to-Maturity Carrying Amount	2,793	3,193
Gross Unrecognized Holding Gains	186	186
Gross Unrecognized Holding Losses	0	0
Held-to-Maturity Fair Value	2,979	3,379
Residential MBS: | Government-guaranteed	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	1,165	1,248
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Held-to-Maturity Carrying Amount	1,165	1,248
Gross Unrecognized Holding Gains	30	32
Gross Unrecognized Holding Losses	0	0
Held-to-Maturity Fair Value	1,195	1,280
Residential MBS: | Private-label	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	1,368	1,515
Non-credit OTTI Recognized in AOCI (Loss)	-277	-320
Held-to-Maturity Carrying Amount	1,091	1,195
Gross Unrecognized Holding Gains	438	444
Gross Unrecognized Holding Losses	-1	-2
Held-to-Maturity Fair Value	1,528	1,637
Residential MBS: | Total Residential MBS	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	5,326	5,956
Non-credit OTTI Recognized in AOCI (Loss)	-277	-320
Held-to-Maturity Carrying Amount	5,049	5,636
Gross Unrecognized Holding Gains	654	662
Gross Unrecognized Holding Losses	-1	-2
Held-to-Maturity Fair Value	$5,702	$6,296

Investment_Securities_Aging_of

Investment Securities (Aging of Unrealized Temporary Losses on Available-for-sale Securities) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Less than 12 Months	'	'
Fair Value	$3	$62
Gross Unrealized Losses	0	-1
12 Months or More	'	'
Fair Value	2,955	4,271
Gross Unrealized Losses	-16	-41
Total	'	'
Fair Value	2,958	4,333
Gross Unrealized Losses	-16	-42
U.S. Government & other government related	'	'
Less than 12 Months	'	'
Fair Value	'	40
Gross Unrealized Losses	'	-1
12 Months or More	'	'
Fair Value	'	0
Gross Unrealized Losses	'	0
Total	'	'
Fair Value	'	40
Gross Unrealized Losses	'	-1
FFELP ABS	'	'
Less than 12 Months	'	'
Fair Value	3	22
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	921	969
Gross Unrealized Losses	-10	-17
Total	'	'
Fair Value	924	991
Gross Unrealized Losses	-10	-17
Residential MBS: | GSE	'	'
Less than 12 Months	'	'
Fair Value	0	0
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	2,033	3,293
Gross Unrealized Losses	-6	-24
Total	'	'
Fair Value	2,033	3,293
Gross Unrealized Losses	-6	-24
Residential MBS: | Private-label	'	'
Less than 12 Months	'	'
Fair Value	0	0
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	1	9
Gross Unrealized Losses	0	0
Total	'	'
Fair Value	1	9
Gross Unrealized Losses	0	0
Residential MBS: | Total Residential MBS	'	'
Less than 12 Months	'	'
Fair Value	0	0
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	2,034	3,302
Gross Unrealized Losses	-6	-24
Total	'	'
Fair Value	2,034	3,302
Gross Unrealized Losses	($6)	($24)

Investment_Securities_Aging_of1

Investment Securities (Aging of Unrealized Temporary Losses on Held-to-maturity Securities) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Less than 12 Months	'	'
Fair Value	$39	$105
Gross Unrealized Losses	0	-1
12 Months or More	'	'
Fair Value	1,444	1,532
Gross Unrealized Losses	-279	-322
Total	'	'
Fair Value	1,483	1,637
Gross Unrealized Losses	-279	-323
U.S. Government & other government related	'	'
Less than 12 Months	'	'
Fair Value	14	85
Gross Unrealized Losses	0	-1
12 Months or More	'	'
Fair Value	4	0
Gross Unrealized Losses	-1	0
Total	'	'
Fair Value	18	85
Gross Unrealized Losses	-1	-1
State or local housing agency	'	'
Less than 12 Months	'	'
Fair Value	10	10
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	0	0
Gross Unrealized Losses	0	0
Total	'	'
Fair Value	10	10
Gross Unrealized Losses	0	0
Residential MBS: | GSE	'	'
Less than 12 Months	'	'
Fair Value	0	10
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	5	0
Gross Unrealized Losses	0	0
Total	'	'
Fair Value	5	10
Gross Unrealized Losses	0	0
Residential MBS: | Private-label	'	'
Less than 12 Months	'	'
Fair Value	15	0
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	1,435	1,532
Gross Unrealized Losses	-278	-322
Total	'	'
Fair Value	1,450	1,532
Gross Unrealized Losses	-278	-322
Residential MBS: | Total Residential MBS	'	'
Less than 12 Months	'	'
Fair Value	15	10
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	1,440	1,532
Gross Unrealized Losses	-278	-322
Total	'	'
Fair Value	1,455	1,542
Gross Unrealized Losses	($278)	($322)

Investment_Securities_Contract

Investment Securities (Contractual Maturity Terms) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Contractual Maturity Terms [Abstract]	'	'
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$0	'
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	96	'
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	2	'
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	383	'
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	18,809	'
Available-for-Sale Amortized Cost Basis	19,290	20,484
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	0	'
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	101	'
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	2	'
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	408	'
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	19,868	'
Available-for-Sale Carrying Amount and Fair Value	20,379	21,536
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	175	'
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	54	'
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	395	'
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	1,012	'
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	5,049	'
Held-to-Maturity Carrying Amount	6,685	7,917
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	175	'
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	54	'
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	410	'
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	1,062	'
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	5,702	'
Held-to-Maturity Fair Value	$7,403	$8,618

Investment_Securities_Securiti

Investment Securities (Securities Other-Than-Temporarily Impaired) (Details) (Residential MBS:, USD $)	Sep. 30, 2014
In Millions, unless otherwise specified
Available-for-sale | Private-label | Alt-A	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'
Unpaid Principal Balance	$98
Amortized Cost Basis	65
Non-Credit OTTI	0
Gross Unrealized Gains	7
Carrying Amount	72
Fair Value	72
Held-to-maturity | Private-label	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'
Unpaid Principal Balance	1,703
Amortized Cost Basis	1,235
Non-Credit OTTI	-277
Gross Unrealized Gains	0
Carrying Amount	958
Fair Value	1,395
Held-to-maturity | Private-label | Prime	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'
Unpaid Principal Balance	1,051
Amortized Cost Basis	828
Non-Credit OTTI	-203
Gross Unrealized Gains	0
Carrying Amount	625
Fair Value	895
Held-to-maturity | Private-label | Subprime	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'
Unpaid Principal Balance	652
Amortized Cost Basis	407
Non-Credit OTTI	-74
Gross Unrealized Gains	0
Carrying Amount	333
Fair Value	$500

Investment_Securities_OTTI_rol

Investment Securities (OTTI rollforward) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]	'	'	'	'
Beginning Balance	$649	$701	$677	$717
Reductions:	'	'	'	'
Increases in cash flows expected to be collected that have been recognized as accretion into net interest income	-15	-11	-43	-27
Ending Balance	$634	$690	$634	$690

Advances_By_callable_putable_f

Advances (By callable putable feature) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Federal Home Loan Bank, Advances [Line Items]	'	'
Total par value	$26,648	$23,425
Hedging adjustments	98	39
Other adjustments	20	25
Total advances	26,766	23,489
Noncallable/nonputable	'	'
Federal Home Loan Bank, Advances [Line Items]	'	'
Total par value	23,985	20,259
Callable	'	'
Federal Home Loan Bank, Advances [Line Items]	'	'
Total par value	964	1,440
Putable	'	'
Federal Home Loan Bank, Advances [Line Items]	'	'
Total par value	$1,699	$1,726

Advances_By_redemption_terms_D

Advances (By redemption terms) (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Federal Home Loan Bank, Advances, Rolling Maturity [Abstract]	'		'
Federal Home Loan Bank, Advances, Maturities Summary, in Next Rolling Twelve Months	$5,571		'
Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Two	2,818		'
Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Three	1,518		'
Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Four	4,377		'
Federal Home Loan Bank, Advances, Maturities Summary, in Rolling Year Five	10,776		'
Federal Home Loan Bank, Advances, Maturities Summary, after Rolling Year Five	1,588		'
Federal Home Loan Bank, Advances, Par Value	26,648		23,425
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Next Twelve Rolling Months	0.36%		'
Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Two	1.80%		'
Federal Home Loan Bank Advances, Weighted Average Interest Rate, Maturing in Rolling Year Three	2.74%		'
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Four	1.03%	[1]	'
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing in Rolling Year Five	0.20%	[1]	'
Federal Home Loan Bank, Advances, Weighted Average Interest Rate, Maturing after Rolling Year Five	3.05%		'
Federal Home Loan Bank, Advances, Weighted Average Interest Rate	0.85%		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Next Rolling Twelve Months	6,533		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Two	2,668		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Three	1,360		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Four	3,900		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, in Rolling Year Five	10,604		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Call Date, after Rolling Year Five	1,583		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Next Rolling Twelve Months	7,269		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Two	2,089		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Three	1,102		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Four	3,859		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, in Rolling Year Five	10,766		'
Federal Home Loan Bank, Advances, Earlier of Contractual Maturity or Next Put or Convert Date, after Rolling Year Five	$1,563		'
[1]	Low weighted average interest rate is relatively lower when compared to other categories due to a majority of advances in this category consisting of variable rate advances which are at low current market rates of interest.

MPF_Loans_Details

MPF Loans (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Mortgage Loans on Real Estate [Line Items]	'	'
Total unpaid principal balance	$6,360	$7,631
Net premiums, credit enhancement and deferred loan fees	24	27
Hedging adjustments	54	66
Total before allowance for credit losses	6,438	7,724
Allowance for credit losses on MPF Loans	-16	-29
Total MPF Loans held in portfolio, net	6,422	7,695
Medium term (15 years or less) [Member]	'	'
Mortgage Loans on Real Estate [Line Items]	'	'
Total unpaid principal balance	1,222	1,672
Long term (greater than 15 years) [Member]	'	'
Mortgage Loans on Real Estate [Line Items]	'	'
Total unpaid principal balance	5,138	5,959
Conventional mortgage loans	'	'
Mortgage Loans on Real Estate [Line Items]	'	'
Total unpaid principal balance	4,941	5,969
Government insured mortgage loans	'	'
Mortgage Loans on Real Estate [Line Items]	'	'
Total unpaid principal balance	$1,419	$1,662

Allowance_for_Credit_Losses_MP

Allowance for Credit Losses (MPF Risk Sharing Structure) (Details) (USD $)	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]	'		'	'		'	'	'
Allowance for credit losses on conventional MPF Loans	$16		'	$29		'	'	'
Conventional	'		'	'		'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'		'	'		'	'	'
Total Severity Rate	27.00%		'	35.00%		'	'	'
Credit Loss Severity Rate	13.00%		'	19.00%		'	'	'
Total estimated losses outstanding	51		'	65		'	'	'
Less: losses expected to be absorbed by MPF Risk Sharing Structure	-20	[1]	'	-18	[1]	'	'	'
Our share of total losses	31		'	47		'	'	'
Less: non-credit losses	-16		'	-21		'	'	'
Credit losses	15		'	26		'	'	'
Plus: other estimated credit losses in the remaining portfolio	1		'	3		'	'	'
Allowance for credit losses on conventional MPF Loans	$16		$19	$29		$32	$34	$42
[1]	Represents aggregate of credit enhancements across all master commitments expected to be recovered. Credit enhancement from one master commitment may not be used to offset credit losses incurred by another master commitment.

Allowance_for_Credit_Losses_Al

Allowance for Credit Losses (Allowance roll forward) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Balance, beginning of period	'	'	$29	'
Reversal of allowance for credit losses	-2	0	-8	-2
Balance, end of period	16	'	16	'
Conventional	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Balance, beginning of period	19	34	29	42
Losses charged to the allowance	-1	-2	-5	-8
Reversal of allowance for credit losses	-2	0	-8	-2
Balance, end of period	$16	$32	$16	$32

Allowance_for_Credit_Losses_Lo

Allowance for Credit Losses (Loans evaluated for impairment) (Details) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Allowance for credit losses on conventional MPF Loans	$16	'	$29	'	'	'
Total recorded investment	6,470	'	7,763	'	'	'
Conventional	'	'	'	'	'	'
Specifically identified and individually evaluated for impairment	12	'	22	'	'	'
Homogeneous pools of loans and collectively evaluated for impairment	4	'	7	'	'	'
Allowance for credit losses on conventional MPF Loans	16	19	29	32	34	42
Individually evaluated for impairment - with an allowance	172	'	215	'	'	'
Collectively evaluated for impairment	4,855	'	5,861	'	'	'
Total recorded investment	$5,027	'	$6,076	'	'	'

Allowance_for_Credit_Losses_Cr

Allowance for Credit Losses (Credit Quality Indicators - MPF Loans) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Recorded Investment, Past Due [Line Items]	'		'
Past due 30-59 days	$229		$269
Past due 60-89 days	62		81
Past due 90 days or more	205		353
Total past due	496		703
Total current	5,974		7,060
Total recorded investment	6,470		7,763
Also in process of foreclosure	97		159
Serious delinquency rate	3.18%	[1]	4.58%	[1],[2]
Past due 90 days or more still accruing interest	65	[3]	178	[3]
On nonaccrual status	176		221
Conventional	'		'
Recorded Investment, Past Due [Line Items]	'		'
Past due 30-59 days	141		165
Past due 60-89 days	38		50
Past due 90 days or more	165		202
Total past due	344		417
Total current	4,683		5,659
Total recorded investment	5,027		6,076
Also in process of foreclosure	85		108
Serious delinquency rate	3.30%	[1]	3.37%	[1],[2]
Past due 90 days or more still accruing interest	25	[3]	27	[3]
On nonaccrual status	176		221
Government	'		'
Recorded Investment, Past Due [Line Items]	'		'
Past due 30-59 days	88		104
Past due 60-89 days	24		31
Past due 90 days or more	40	[4]	151
Total past due	152		286
Total current	1,291		1,401
Total recorded investment	1,443		1,687
Also in process of foreclosure	12	[4]	51
Serious delinquency rate	2.77%	[1],[4]	8.94%	[1],[2]
Past due 90 days or more still accruing interest	40	[3]	151	[3]
On nonaccrual status	0		0
Mortgage Loans on Real Estate, Cost of Mortgages Sold	$109		'
[1]	MPF Loans that are 90 days or more past due or in the process of foreclosure as a percentage of the total recorded investment.
[2]	We corrected an error to adjust the serious delinquency rate of MPF Loans disclosed above as of December 31, 2013, as previously reported in our 2013 Form 10-K and in our Form 10-Q as of March 31, 2014. The error had no effect on our allowance for credit losses as of December 31, 2013, because this rate was not used when determining our allowance for credit losses. After evaluating the quantitative and qualitative aspects of these adjustments, we concluded that prior period financial statements were not materially misstated. Further, the error had no effect on our 2014 financial statements.
[3]	Consists of MPF Loans that are either government guaranteed or conventional mortgage loans that are well secured (by collateral that have a realizable value sufficient to discharge the debt or by the guarantee or insurance, such as PMI, of a financially responsible party) and in the process of collection.
[4]	During the third quarter of 2014, as permitted under our MPF Program Guides for Government MPF Loans, one of our servicers elected at their option to repurchase $109 million of their delinquent loans from us at their outstanding unpaid principal balance, rather than continue to advance to us payments of principal and interest when they are not collecting these amounts from the borrower.

Allowance_for_Credit_Losses_Tr

Allowance for Credit Losses (Troubled debt restructurings outstanding balances) (Details) (Conventional, USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'
Recorded investment	$70	$59
Performing	'	'
Financing Receivable, Modifications [Line Items]	'	'
Recorded investment	44	16
Nonperforming	'	'
Financing Receivable, Modifications [Line Items]	'	'
Recorded investment	$26	$43

Allowance_for_Credit_Losses_Tr1

Allowance for Credit Losses (Troubled debt restructurings activity) (Details) (Conventional, USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Conventional	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
TDRs made during the periods	$10	$8	$25	$27

Allowance_for_Credit_Losses_Tr2

Allowance for Credit Losses (Troubled debt restructurings subsequent period defaults) (Details) (Conventional, USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Conventional	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'
TDRs from the previous 12 months that subsequently defaulted during the periods	$17	$15	$19	$17

Allowance_for_Credit_Losses_Im

Allowance for Credit Losses (Impaired MPF Loans at period ends) (Details) (Conventional, USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Conventional	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	$172	$215
Unpaid Principal Balance	170	210
Related Allowance	$12	$22

Allowance_for_Credit_Losses_Im1

Allowance for Credit Losses (Impaired MPF Loans during the periods) (Details) (Conventional, USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Conventional	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'
Average Recorded Investment	$176	$219	$190	$218

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (Narrative) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'
Additional collateral due to derivatives counterparties if credit rating was lowered one level	$48	'
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	58	32
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty	$4	'

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activities (Derivatives in statements of condition) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	$54,453	$48,377
Total derivative assets on statements of condition	30	35
Total derivative liabilities on statements of condition	54	108
Derivatives in hedge accounting relationships- | Interest rate swaps	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	31,386	28,346
Derivatives not in hedge accounting relationships-	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	23,067	20,031
Derivatives not in hedge accounting relationships- | Interest rate swaps	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	19,243	14,199
Derivatives not in hedge accounting relationships- | Interest rate swaptions	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	2,315	4,465
Derivatives not in hedge accounting relationships- | Interest rate caps or floors	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	1,164	1,164
Derivatives not in hedge accounting relationships- | Interest rate futures	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	41	0
Derivatives not in hedge accounting relationships- | Mortgage delivery commitments	'	'
Derivatives, Fair Value [Line Items]	'	'
Notional Amount	304	203
Derivative Assets	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	669	731
Netting adjustments (excluding cash collateral)	-617	-677
Exposure at fair value	52	54
Cash collateral (and related accrued interest)	-22	-19
Total derivative assets on statements of condition	30	35
Derivative Assets | Derivatives in hedge accounting relationships- | Interest rate swaps	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	53	85
Derivative Assets | Derivatives not in hedge accounting relationships-	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	616	646
Derivative Assets | Derivatives not in hedge accounting relationships- | Interest rate swaps	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	455	440
Derivative Assets | Derivatives not in hedge accounting relationships- | Interest rate swaptions	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	48	60
Derivative Assets | Derivatives not in hedge accounting relationships- | Interest rate caps or floors	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	110	143
Derivative Assets | Derivatives not in hedge accounting relationships- | Interest rate futures	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	0	0
Derivative Assets | Derivatives not in hedge accounting relationships- | Mortgage delivery commitments	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	3	3
Derivative Liabilities	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	1,602	1,959
Netting adjustments (excluding cash collateral)	-617	-677
Exposure at fair value	985	1,282
Cash collateral (and related accrued interest)	-931	-1,174
Total derivative liabilities on statements of condition	54	108
Derivative Liabilities | Derivatives in hedge accounting relationships- | Interest rate swaps	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	1,323	1,670
Derivative Liabilities | Derivatives not in hedge accounting relationships-	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	279	289
Derivative Liabilities | Derivatives not in hedge accounting relationships- | Interest rate swaps	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	276	286
Derivative Liabilities | Derivatives not in hedge accounting relationships- | Interest rate swaptions	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	0	0
Derivative Liabilities | Derivatives not in hedge accounting relationships- | Interest rate caps or floors	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	0	0
Derivative Liabilities | Derivatives not in hedge accounting relationships- | Interest rate futures	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	0	0
Derivative Liabilities | Derivatives not in hedge accounting relationships- | Mortgage delivery commitments	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative amount before adjustments	$3	$3

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activities (Derivative instruments with legal right of offset) (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Derivatives with legal right of offset -	'		'
Total derivative assets on statements of condition	$30		$35
Total derivative liabilities on statements of condition	54		108
Derivative Assets	'		'
Derivatives with legal right of offset -	'		'
Gross recognized amount	666		728
Netting adjustments and cash collateral	-639		-696
Derivatives with legal right of offset - net	27		32
Derivatives without legal right of offset	3		3
Total derivative assets on statements of condition	30		35
Derivative, Collateral, Obligation to Return Cash	1		'
Margin Deposit Assets	-22		-19
Noncash collateral pledged (received)	29		-31
Net amount	60	[1]	4	[1]
Derivative Assets | Bilateral	'		'
Derivatives with legal right of offset -	'		'
Gross recognized amount	637		707
Netting adjustments and cash collateral	-611		-676
Derivatives with legal right of offset - net	26		31
Derivatives without legal right of offset	3		3
Total derivative assets on statements of condition	29		34
Derivative, Collateral, Obligation to Return Cash	0		'
Noncash collateral pledged (received)	-25		-31
Net amount	4		3
Derivative Assets | Cleared	'		'
Derivatives with legal right of offset -	'		'
Gross recognized amount	29		21
Netting adjustments and cash collateral	-28		-20
Derivatives with legal right of offset - net	1		1
Derivatives without legal right of offset	0		0
Total derivative assets on statements of condition	1		1
Derivative, Collateral, Obligation to Return Cash	1		'
Noncash collateral pledged (received)	54		0
Net amount	56		1
Derivative Liabilities	'		'
Derivatives with legal right of offset -	'		'
Gross recognized amount	1,599		1,956
Netting adjustments and cash collateral	-1,548		-1,851
Derivatives with legal right of offset - net	51		105
Derivatives without legal right of offset	3		3
Total derivative liabilities on statements of condition	54		108
Noncash collateral pledged (received)	0		0
Net amount	54	[1]	108	[1]
Derivative Liabilities | Bilateral	'		'
Derivatives with legal right of offset -	'		'
Gross recognized amount	1,460		1,949
Netting adjustments and cash collateral	-1,409		-1,845
Derivatives with legal right of offset - net	51		104
Derivatives without legal right of offset	3		3
Total derivative liabilities on statements of condition	54		107
Noncash collateral pledged (received)	0		0
Net amount	54		107
Derivative Liabilities | Cleared	'		'
Derivatives with legal right of offset -	'		'
Gross recognized amount	139		7
Netting adjustments and cash collateral	-139		-6
Derivatives with legal right of offset - net	0		1
Derivatives without legal right of offset	0		0
Total derivative liabilities on statements of condition	0		1
Noncash collateral pledged (received)	0		0
Net amount	$0		$1
[1]	Any over-collateralization received by or paid from us to an individual clearing member and/or at a counterparty arrangement level is not included in the determination of the net amount. Specifically, any such over-collateralization amount received by us is not offset against another derivative asset counterparty exposure for which there is no legal right of offset, while any over-collateralization delivered by us is not offset against another derivative liability counterparty exposure for which there is no legal right of offset.

Derivatives_and_Hedging_Activi5

Derivatives and Hedging Activities (Derivatives in Statement of Income) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Fair value hedges	($3)	$2	($15)	$13
Cash flow hedges	0	1	1	4
Economic hedges	4	-14	3	2
Gains (losses) on derivatives and hedging activities	1	-11	-11	19
Interest rate swaps	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Fair value hedges	-3	2	-15	13
Economic hedges	1	-2	-2	62
Interest rate swaptions	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Economic hedges	-4	-20	-20	-37
Interest rate caps or floors	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Economic hedges	-17	-7	-32	-65
Mortgage delivery commitments	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Economic hedges	1	0	2	1
Net interest settlements	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Economic hedges	$23	$15	$55	$41

Derivatives_and_Hedging_Activi6

Derivatives and Hedging Activities (Fair Value Hedges) (Details) (USD $)	3 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
On Derivative	$0		$54		$189		($30)
On Hedged Item	-3		-52		-204		43
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	-3		2		-15		13
Net Interest Settlements Effect on Net Interest Income	8	[1]	11	[1]	24	[1]	10	[1]
Hedge Adjustments Amortized into Net Interest Income	-6	[2]	-4	[2]	-27	[2]	-38	[2]
Available-for-sale securities	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
On Derivative	50		7		20		241
On Hedged Item	-50		-6		-23		-233
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	0		1		-3		8
Net Interest Settlements Effect on Net Interest Income	-35	[1]	-35	[1]	-105	[1]	-104	[1]
Hedge Adjustments Amortized into Net Interest Income	0	[2]	0	[2]	0	[2]	0	[2]
Advances	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
On Derivative	7		10		-56		108
On Hedged Item	-5		-9		62		-101
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	2		1		6		7
Net Interest Settlements Effect on Net Interest Income	-20	[1]	-16	[1]	-60	[1]	-50	[1]
Hedge Adjustments Amortized into Net Interest Income	-1	[2]	9	[2]	-3	[2]	7	[2]
MPF Loans held for portfolio	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
On Derivative	0		0		0		0
On Hedged Item	0		0		0		0
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	0		0		0		0
Net Interest Settlements Effect on Net Interest Income	0	[1]	0	[1]	0	[1]	0	[1]
Hedge Adjustments Amortized into Net Interest Income	-4	[2]	-8	[2]	-13	[2]	-27	[2]
Consolidated obligation bonds	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
On Derivative	-57		37		225		-379
On Hedged Item	52		-37		-243		377
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	-5		0		-18		-2
Net Interest Settlements Effect on Net Interest Income	63	[1]	62	[1]	189	[1]	164	[1]
Hedge Adjustments Amortized into Net Interest Income	($1)	[2]	($5)	[2]	($11)	[2]	($18)	[2]
[1]	Represents the effect of net interest settlements attributable to existing derivative hedging instruments on net interest income. The effect of derivatives on net interest income is included in the interest income/expense line item of the respective hedged item type.
[2]	Amortization of hedge adjustments is included in the interest income/expense line item of the respective hedged item type.

Derivatives_and_Hedging_Activi7

Derivatives and Hedging Activities (Cash Flow Hedges) (Details) (USD $)	3 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Ineffective Portion Reclassified to Derivatives and Hedging Activities	$0		$1		$1		$4
Cash Flow Hedge Gain (Loss) to be Reclassified Next 12 Months, Net	8		'		8		'
Maximum Hedging Period For Forecasted Cash Flows	'6 years		'		'		'
Cash Flow Hedges	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amortization of Effective Portion Reclassified From AOCI to Interest	2		1		5		5
Ineffective Portion Reclassified to Derivatives and Hedging Activities	0		1		1		4
Total Reclassified Into Statements of Income	2		2		6		9
Effective Portion Recorded in AOCI	87		21		97		348
Net Change in OCI	85		19		91		339
Net Interest Settlements Classified in Net Interest Income	-62	[1]	-66	[1]	-184	[1]	-200	[1]
Advances | Cash Flow Hedges | Interest rate floors	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amortization of Effective Portion Reclassified From AOCI to Interest	4		3		9		10
Ineffective Portion Reclassified to Derivatives and Hedging Activities	0		0		0		0
Total Reclassified Into Statements of Income	4		3		9		10
Effective Portion Recorded in AOCI	0		0		0		0
Net Change in OCI	-4		-3		-9		-10
Net Interest Settlements Classified in Net Interest Income	0		0		0		0
Discount Notes | Cash Flow Hedges | Interest rate caps	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amortization of Effective Portion Reclassified From AOCI to Interest	'		'		'		-1
Ineffective Portion Reclassified to Derivatives and Hedging Activities	'		'		'		0
Total Reclassified Into Statements of Income	'		'		'		-1
Effective Portion Recorded in AOCI	'		'		'		0
Net Change in OCI	'		'		'		1
Net Interest Settlements Classified in Net Interest Income	'		'		'		0
Discount Notes | Cash Flow Hedges | Interest rate swaps	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amortization of Effective Portion Reclassified From AOCI to Interest	-1		-1		-2		-2
Ineffective Portion Reclassified to Derivatives and Hedging Activities	0		1		1		4
Total Reclassified Into Statements of Income	-1		0		-1		2
Effective Portion Recorded in AOCI	87		21		97		348
Net Change in OCI	88		21		98		346
Net Interest Settlements Classified in Net Interest Income	-62	[1]	-66	[1]	-184	[1]	-200	[1]
Consolidated obligation bonds | Cash Flow Hedges | Interest rate swaps	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Amortization of Effective Portion Reclassified From AOCI to Interest	-1		-1		-2		-2
Ineffective Portion Reclassified to Derivatives and Hedging Activities	0		0		0		0
Total Reclassified Into Statements of Income	-1		-1		-2		-2
Effective Portion Recorded in AOCI	0		0		0		0
Net Change in OCI	1		1		2		2
Net Interest Settlements Classified in Net Interest Income	$0		$0		$0		$0
[1]	Represents the effect of net interest settlements attributable to open derivative hedging instruments on net interest income. The effect of derivatives on net interest income is included in the interest income/expense line item of the respective hedged item type.

Consolidated_Obligations_Bonds

Consolidated Obligations (Bonds by maturity date) (Details) (Consolidated obligation bonds, USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Extinguishment of Debt [Line Items]	'	'
Due in one year or less	$3,652	'
One to two years	3,925	'
Two to three years	5,980	'
Three to four years	5,072	'
Four to five years	4,829	'
Thereafter	12,021	'
Total par value	35,479	32,492
Due in one year or less, weighted average interest rate	1.39%	'
One to two years, weighted average interest rate	2.89%	'
Two to three years, weighted average interest rate	1.90%	'
Three to four years, weighted average interest rate	1.56%	'
Four to five years, weighted average interest rate	1.56%	'
Thereafter, weighted average interest rate	2.25%	'
Total par value, weighted average interest rate	1.98%	'
By Next Maturity or Call Date	'	'
Extinguishment of Debt [Line Items]	'	'
Due in one year or less	26,789	'
One to two years	3,515	'
Two to three years	1,948	'
Three to four years	1,200	'
Four to five years	833	'
Thereafter	1,194	'
Total par value	$35,479	'

Consolidated_Obligations_Short

Consolidated Obligations (Short term discount notes) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Short-term Debt [Line Items]	'	'
Carrying Amount	$30,507	$31,089
Discount Notes	'	'
Short-term Debt [Line Items]	'	'
Carrying Amount	30,507	31,089
Par Value	$30,512	$31,092
Weighted Average Interest Rate	0.06%	0.07%

Consolidated_Obligations_Bonds1

Consolidated Obligations (Bonds by callable feature) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'	'
Total consolidated obligation bonds	$35,239	$31,987
Consolidated obligation bonds	'	'
Debt Instrument [Line Items]	'	'
Par value	35,479	32,492
Bond premiums (discounts), net	19	20
Hedging adjustments	-272	-526
Fair value option adjustments	13	1
Total consolidated obligation bonds	35,239	31,987
Noncallable | Consolidated obligation bonds	'	'
Debt Instrument [Line Items]	'	'
Par value	11,477	12,927
Callable | Consolidated obligation bonds	'	'
Debt Instrument [Line Items]	'	'
Par value	$24,002	$19,565

Consolidated_Obligations_Syste

Consolidated Obligations (Systemwide joint & several liability) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Obligation with Joint and Several Liability Arrangement [Line Items]	'	'
FHLB System total consolidated obligations	$816,950	$766,837
FHLB Chicago as primary obligor	65,991	63,584
As a percent of the FHLB System	8.00%	8.00%
Bonds	'	'
Obligation with Joint and Several Liability Arrangement [Line Items]	'	'
FHLB System total consolidated obligations	489,270	473,495
FHLB Chicago as primary obligor	35,479	32,492
As a percent of the FHLB System	7.00%	7.00%
Discount Notes	'	'
Obligation with Joint and Several Liability Arrangement [Line Items]	'	'
FHLB System total consolidated obligations	327,680	293,342
FHLB Chicago as primary obligor	$30,512	$31,092
As a percent of the FHLB System	9.00%	11.00%

Capital_and_Mandatorily_Redeem2

Capital and Mandatorily Redeemable Capital Stock (Capital rules) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Capital [Abstract]	'	'
Capital stock par value	$100	$100
Capital Stock, redemption, period of written notice	'5 years	'
Minimum threshold B2 activity capital stock $ requirement	$5,000,000	'
Maximum threshold B2 activity capital stock $ requirement	250,000,000	'
Minimum advance activity capital stock % requirement	2.00%	'
Standard advance activity capital stock requirement	5.00%	'
Maximum advance activity capital stock % requirement	6.00%	'
Loans and Leases Receivable, Commercial, Loans in Process	5,000,000,000	'
Standard membership capital stock requirement $ cap amount	165,300,000	'
Minimum membership capital stock requirement $ cap amount	25,000,000	'
Maximum membership capital stock requirement $ cap amount	$250,000,000	'
Maximum membership capital stock requirement as a % of total	9.90%	'

Capital_and_Mandatorily_Redeem3

Capital and Mandatorily Redeemable Capital Stock (Regulatory capital requirements) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Equity [Abstract]	'	'
Risk Based Capital, Requirement	$1,184	$1,465
Risk Based Capital, Actual	4,110	3,703
Regulatory Capital, Requirement	2,881	2,752
Regulatory Capital, Actual	4,110	3,703
Regulatory Capital Ratio, Requirement	4.00%	4.00%
Regulatory Capital Ratio, Actual	5.71%	5.38%
Leverage Capital, Requirement	3,602	3,440
Leverage Capital, Actual	$6,164	$5,555
Leverage Ratio, Required	5.00%	5.00%
Leverage Ratio, Actual	8.56%	8.07%

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Period amounts reclassified to:	'	'	'	'
Non-interest expense	($12)	($8)	($34)	($28)
Total AOCI	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	240	31	67	107
Change in the period before reclassifications to net income	1	23	177	-48
Period amounts reclassified to:	'	'	'	'
Net interest income	-2	0	-5	-3
Non-interest gain (loss)	'	-1	-1	-4
Non-interest expense	'	-1	1	'
Net change in the period	-1	21	172	-55
Ending balance	239	52	239	52
Net Unrealized Gain (Loss) | Available-for-sale	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	1,188	1,139	1,052	1,576
Change in the period before reclassifications to net income	-99	-13	37	-450
Period amounts reclassified to:	'	'	'	'
Net interest income	0	0	0	0
Non-interest gain (loss)	'	0	0	0
Non-interest expense	'	0	0	'
Net change in the period	-99	-13	37	-450
Ending balance	1,089	1,126	1,089	1,126
Net Unrealized Gain (Loss) | Held-to-maturity	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	-1	-2	-1	-3
Change in the period before reclassifications to net income	0	0	0	0
Period amounts reclassified to:	'	'	'	'
Net interest income	0	1	0	2
Non-interest gain (loss)	'	0	0	0
Non-interest expense	'	0	0	'
Net change in the period	0	1	0	2
Ending balance	-1	-1	-1	-1
Non-credit OTTI | Available-for-sale	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	0	0	0	-8
Change in the period before reclassifications to net income	0	0	0	8
Period amounts reclassified to:	'	'	'	'
Net interest income	0	0	0	0
Non-interest gain (loss)	'	0	0	0
Non-interest expense	'	0	0	'
Net change in the period	0	0	0	8
Ending balance	0	0	0	0
Non-credit OTTI | Held-to-maturity	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	-292	-350	-320	-381
Change in the period before reclassifications to net income	15	15	43	46
Period amounts reclassified to:	'	'	'	'
Net interest income	0	0	0	0
Non-interest gain (loss)	'	0	0	0
Non-interest expense	'	0	0	'
Net change in the period	15	15	43	46
Ending balance	-277	-335	-277	-335
Net Unrealized on Cash Flow Hedges	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	-659	-758	-665	-1,078
Change in the period before reclassifications to net income	87	21	97	348
Period amounts reclassified to:	'	'	'	'
Net interest income	-2	-1	-5	-5
Non-interest gain (loss)	'	-1	-1	-4
Non-interest expense	'	0	0	'
Net change in the period	85	19	91	339
Ending balance	-574	-739	-574	-739
Post-Retirement Plans	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
Beginning balance	4	2	1	1
Change in the period before reclassifications to net income	-2	0	0	0
Period amounts reclassified to:	'	'	'	'
Net interest income	0	0	0	0
Non-interest gain (loss)	'	0	0	0
Non-interest expense	'	-1	1	'
Net change in the period	-2	-1	1	0
Ending balance	$2	$1	$2	$1

Fair_Value_Accounting_Carrying

Fair Value Accounting (Carrying Value and Fair Value of Financial Instruments) (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Financial Assets-	'		'
Held-to-maturity securities	$7,403		$8,618
Advances	73		30
Financial Liabilities-	'		'
Consolidated obligation discount notes	-1,531		-75
Consolidated obligation bonds	-3,213		-1,021
Carrying Amount	'		'
Financial Assets-	'		'
Cash and due from banks	8,413		971
Interest bearing deposits	560		'
Federal Funds sold	1,783		500
Securities purchased under agreements to resell	'		4,550
Held-to-maturity securities	6,685		7,917
Advances	26,766		23,489
MPF Loans held in portfolio, net	6,422		7,695
Accrued interest receivable	81		93
Financial Liabilities-	'		'
Deposits	-530		-544
Consolidated obligation discount notes	-30,507		-31,089
Consolidated obligation bonds	-35,239		-31,987
Accrued interest payable	-200		-137
Mandatorily redeemable capital stock	-5		-5
Subordinated notes	-944		-944
Fair Value	'		'
Financial Assets-	'		'
Cash and due from banks	8,413		971
Interest bearing deposits	560		'
Federal Funds sold	1,783		500
Securities purchased under agreements to resell	'		4,550
Held-to-maturity securities	7,403		8,618
Advances	26,875		23,586
MPF Loans held in portfolio, net	6,957		8,269
Accrued interest receivable	81		93
Financial Liabilities-	'		'
Deposits	-530		-544
Consolidated obligation discount notes	-30,507		-31,089
Consolidated obligation bonds	-35,819		-32,645
Accrued interest payable	-200		-137
Mandatorily redeemable capital stock	-5		-5
Subordinated notes	-1,026		-1,055
Level 1	'		'
Financial Assets-	'		'
Cash and due from banks	8,413		971
Interest bearing deposits	560		'
Federal Funds sold	0		0
Securities purchased under agreements to resell	'		0
Held-to-maturity securities	0		0
Advances	0		0
MPF Loans held in portfolio, net	0		0
Accrued interest receivable	0		0
Financial Liabilities-	'		'
Deposits	0		0
Consolidated obligation discount notes	0		0
Consolidated obligation bonds	0		0
Accrued interest payable	0		0
Mandatorily redeemable capital stock	-5		-5
Subordinated notes	0		0
Level 2	'		'
Financial Assets-	'		'
Cash and due from banks	0		0
Interest bearing deposits	0		'
Federal Funds sold	1,783		500
Securities purchased under agreements to resell	'		4,550
Held-to-maturity securities	5,875		6,981
Advances	26,875		23,586
MPF Loans held in portfolio, net	6,795		8,069
Accrued interest receivable	81		93
Financial Liabilities-	'		'
Deposits	-530		-544
Consolidated obligation discount notes	-30,507		-31,089
Consolidated obligation bonds	-35,757		-32,576
Accrued interest payable	-200		-137
Mandatorily redeemable capital stock	0		0
Subordinated notes	-1,026		-1,055
Level 3	'		'
Financial Assets-	'		'
Cash and due from banks	0		0
Interest bearing deposits	0		'
Federal Funds sold	0		0
Securities purchased under agreements to resell	'		0
Held-to-maturity securities	1,528		1,637
Advances	0		0
MPF Loans held in portfolio, net	162		200
Accrued interest receivable	0		0
Financial Liabilities-	'		'
Deposits	0		0
Consolidated obligation discount notes	0		0
Consolidated obligation bonds	-62	[1]	-69	[1]
Accrued interest payable	0		0
Mandatorily redeemable capital stock	0		0
Subordinated notes	$0		$0
[1]	Amount represents debt carried at fair value under a full fair value hedge strategy, not at fair value under the fair value option.

Fair_Value_Accounting_Fair_Val

Fair Value Accounting (Fair Value Measured on Recurring Basis) (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Financial Assets-	'		'
Trading securities	$822		$1,899
Available-for-sale	20,379		21,536
Advances	73		30
Derivative assets	30		35
Financial Liabilities-	'		'
Consolidated obligation discount notes	-1,531		-75
Consolidated obligation bonds	-3,213		-1,021
Derivative liabilities	-54		-108
Recurring	'		'
Financial Assets-	'		'
Derivative Netting Adjustment and Cash Collateral	-639	[1]	-696	[1]
Financial Liabilities-	'		'
Derivative Netting Adjustment and Cash Collateral	1,548	[1]	1,851	[1]
U.S. Government & other government related	'		'
Financial Assets-	'		'
Trading securities	754		1,823
Residential MBS: | GSE	'		'
Financial Assets-	'		'
Trading securities	66		74
Residential MBS: | Government-guaranteed	'		'
Financial Assets-	'		'
Trading securities	2		2
Level 2	'		'
Financial Assets-	'		'
Advances	26,875		23,586
Financial Liabilities-	'		'
Consolidated obligation discount notes	-30,507		-31,089
Consolidated obligation bonds	-35,757		-32,576
Level 2 | Recurring	'		'
Financial Assets-	'		'
Trading securities	822		1,899
Available-for-sale	20,305		21,464
Advances	73		30
Derivative assets	657		712
Total financial assets at fair value	21,857		24,105
Financial Liabilities-	'		'
Consolidated obligation discount notes	-1,531		-75
Consolidated obligation bonds	-3,213		-1,021
Derivative liabilities	-1,602		-1,959
Total financial liabilities at fair value	-6,346		-3,055
Level 2 | U.S. Government & other government related | Recurring	'		'
Financial Assets-	'		'
Trading securities	754		1,823
Available-for-sale	511		588
Level 2 | FFELP ABS | Recurring	'		'
Financial Assets-	'		'
Available-for-sale	6,444		6,803
Level 2 | Residential MBS: | GSE | Recurring	'		'
Financial Assets-	'		'
Trading securities	66		74
Available-for-sale	10,896		11,382
Level 2 | Residential MBS: | Government-guaranteed | Recurring	'		'
Financial Assets-	'		'
Trading securities	2		2
Available-for-sale	2,454		2,691
Level 2 | Residential MBS: | Private-label | Recurring	'		'
Financial Assets-	'		'
Available-for-sale	0		0
Level 3	'		'
Financial Assets-	'		'
Advances	0		0
Financial Liabilities-	'		'
Consolidated obligation discount notes	0		0
Consolidated obligation bonds	-62	[2]	-69	[2]
Level 3 | Recurring	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale	74		72
Advances	0		0
Derivative assets	12		19
Total financial assets at fair value	86		91
Level 3 as a percent of total assets at fair value	0.40%		0.40%
Financial Liabilities-	'		'
Consolidated obligation discount notes	0		0
Consolidated obligation bonds	-62	[2]	-69	[2]
Derivative liabilities	0		0
Total financial liabilities at fair value	-62		-69
Level 3 as a percent of total liabilities at fair value	1.30%		5.40%
Level 3 | U.S. Government & other government related | Recurring	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale	0		0
Level 3 | FFELP ABS | Recurring	'		'
Financial Assets-	'		'
Available-for-sale	0		0
Level 3 | Residential MBS: | GSE | Recurring	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale	0		0
Level 3 | Residential MBS: | Government-guaranteed | Recurring	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale	0		0
Level 3 | Residential MBS: | Private-label | Recurring	'		'
Financial Assets-	'		'
Available-for-sale	74		72
Total Fair Value | Recurring	'		'
Financial Assets-	'		'
Trading securities	822		1,899
Available-for-sale	20,379		21,536
Advances	73		30
Derivative assets	30		35
Total financial assets at fair value	21,304		23,500
Financial Liabilities-	'		'
Consolidated obligation discount notes	-1,531		-75
Consolidated obligation bonds	-3,275		-1,090
Derivative liabilities	-54		-108
Total financial liabilities at fair value	-4,860		-1,273
Total Fair Value | U.S. Government & other government related | Recurring	'		'
Financial Assets-	'		'
Trading securities	754		1,823
Available-for-sale	511		588
Total Fair Value | FFELP ABS | Recurring	'		'
Financial Assets-	'		'
Available-for-sale	6,444		6,803
Total Fair Value | Residential MBS: | GSE | Recurring	'		'
Financial Assets-	'		'
Trading securities	66		74
Available-for-sale	10,896		11,382
Total Fair Value | Residential MBS: | Government-guaranteed | Recurring	'		'
Financial Assets-	'		'
Trading securities	2		2
Available-for-sale	2,454		2,691
Total Fair Value | Residential MBS: | Private-label | Recurring	'		'
Financial Assets-	'		'
Available-for-sale	$74		$72
[1]	The netting adjustment amount includes cash collateral (either received or paid by us) and related accrued interest in cases where we have a legal right of setoff, by contract (e.g., master netting agreement) or otherwise, to discharge all or a portion of the debt owed to our counterparty by applying against the debt an amount that our counterparty owes to us. See Note 9 - Derivatives and Hedging Activities for further details.
[2]	Amount represents debt carried at fair value under a full fair value hedge strategy, not at fair value under the fair value option.

Fair_Value_Accounting_Fair_Val1

Fair Value Accounting (Fair Value Measured on a Nonrecurring Basis) (Details) (Non-recurring, Level 3, USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Non-recurring | Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired MPF Loans	$162	$200
Real estate owned	8	10
Non-recurring assets measured at fair value	$170	$210

Fair_Value_Accounting_Fair_Val2

Fair Value Accounting (Fair Value Option) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair Value, Option, Quantitative Disclosures [Roll Forward]	'	'	'	'
Net gain (loss) on instruments held at fair value	$10	($2)	$11	$1
Advances	'	'	'	'
Fair Value, Option, Quantitative Disclosures [Roll Forward]	'	'	'	'
Balance beginning of period	40	29	30	9
New transactions elected for fair value option	30	0	40	20
Maturities and extinguishments (if any)	0	0	0	0
Net gain (loss) on instruments held at fair value	3	0	3	0
Change in accrued interest and other	0	0	0	0
Balance end of period	73	29	73	29
Consolidated obligation bonds	'	'	'	'
Fair Value, Option, Quantitative Disclosures [Roll Forward]	'	'	'	'
Balance beginning of period	-4,235	-2,548	-1,021	-1,251
New transactions elected for fair value option	-705	-330	-5,640	-2,880
Maturities and extinguishments (if any)	1,725	500	3,450	1,750
Net gain (loss) on instruments held at fair value	7	-2	8	1
Change in accrued interest and other	-5	-2	-10	-2
Balance end of period	-3,213	-2,382	-3,213	-2,382
Discount Notes	'	'	'	'
Fair Value, Option, Quantitative Disclosures [Roll Forward]	'	'	'	'
Balance beginning of period	0	-75	-75	0
New transactions elected for fair value option	-1,531	0	-1,531	-75
Maturities and extinguishments (if any)	0	0	75	0
Net gain (loss) on instruments held at fair value	0	0	0	0
Change in accrued interest and other	0	0	0	0
Balance end of period	($1,531)	($75)	($1,531)	($75)

Fair_Value_Accounting_Fair_Val3

Fair Value Accounting (Fair Value Option Difference Between Fair Value and Unpaid Principal Balance) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Advances	$73	$30
Consolidated obligation bonds	3,213	1,021
Discount notes	1,531	75
Advances	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Unpaid Principal Balance	70	29
Advances	73	30
Fair Value Over (Under) UPB	3	1
Consolidated obligation bonds	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Unpaid Principal Balance	3,200	1,020
Consolidated obligation bonds	3,213	1,021
Fair Value Over (Under) UPB	13	1
Discount Notes	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Unpaid Principal Balance	1,531	75
Discount notes	1,531	75
Fair Value Over (Under) UPB	$0	$0

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Commitments	'		'
Expire within one year	$6,974		$3,060
Expire after one year	1,499		1,055
Total	8,473		4,115
Unsettled consolidated obligation bonds	'		'
Commitments	'		'
Expire within one year	941		220
Expire after one year	0		0
Total	941		220
Unsettled consolidated obligation discount notes	'		'
Commitments	'		'
Expire within one year	0		1,000
Expire after one year	0		0
Total	0		1,000
Member standby letters of credit	'		'
Commitments	'		'
Expire within one year	1,463		1,407
Expire after one year	1,184	[1]	696	[1]
Total	2,647		2,103
Portion of expire after one year that are also renewable annually	960		495
Housing authority standby bond purchase agreements	'		'
Commitments	'		'
Expire within one year	183		149
Expire after one year	205		258
Total	388		407
MPF Program mortgage purchase commitments	'		'
Commitments	'		'
Expire within one year	154		103
Expire after one year	0		0
Total	154		103
Unresolved repurchasable loans and indemnifications to Fannie Mae for MPF Xtra loans	'		'
Commitments	'		'
Expire within one year	59	[2]	56	[2]
Expire after one year	1		0
Total	60		56
Committed unused member lines of credit	'		'
Commitments	'		'
Expire within one year	4,000	[3]	0
Expire after one year	0		0
Total	4,000		0
Advance commitments	'		'
Commitments	'		'
Expire within one year	174		125
Expire after one year	109		101
Total	$283		$226
[1]	Contains $960 million and $495 million of member standby letters of credit at SeptemberB 30, 2014, and DecemberB 31, 2013, which were renewable annually.
[2]	Amount includes only mortgage loans for which (1) a breach of an eligibility requirement or other warranty has been specifically identified and (2) we believe Fannie Mae will request us to repurchase or provide an indemnity. Accordingly, these unresolved requests are classified in the "expire within one year" category. However, these unresolved requests may occur after one year from the reporting date since they do not have an expiration date. If the PFI from which we purchased an ineligible MPF Xtra loan is viable, we may require the PFI to repurchase that loan from us or indemnify us for related losses. Since we deem it probable that we will recover any losses from the PFIs, we did not recognize a loss in our statement of income related to MPF Xtra loan repurchase or indemnification risk to Fannie Mae.
[3]	A committed unused member line of credit is an agreement that provides our members with the option to take multiple advances up to a specified maximum amount, subject to certain conditions. Portions repaid may be reborrowed under the same arrangement.

Transactions_with_Members_and_2

Transactions with Members and Other FHLBs (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accounts With Related Party Transactions [Line Items]	'	'
Assets - Advances	$26,766	$23,489
Liabilities - Deposits	530	544
Equity - Capital Stock	1,801	1,670
Transactions with members	'	'
Accounts With Related Party Transactions [Line Items]	'	'
Assets - Advances	153	2,546
Liabilities - Deposits	18	27
Equity - Capital Stock	$17	$188