Federal Home Loan Bank of Chicago 10-Q 8 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	3 Months Ended
	Mar. 31, 2014	Apr. 30, 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	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	17,493,929
Entity Well-known Seasoned Issuer	'No	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'

Statements_of_Condition

Statements of Condition (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets	'	'
Cash and due from banks	$726	$971
Interest bearing deposits	560	0
Federal Funds sold	2,884	500
Securities purchased under agreements to resell	6,400	4,550
Investment securities -	'	'
Trading, $46 and $32 pledged	3,142	1,899
Available-for-sale	21,299	21,536
Held-to-maturity, $7,831 and $8,618 fair value	7,129	7,917
Total investment securities	31,570	31,352
Advances, $30 and $30 carried at fair value	22,372	23,489
MPF Loans held in portfolio, net of allowance for credit losses of $(24) and $(29)	7,294	7,695
Accrued interest receivable	88	93
Derivative assets	38	35
Software and equipment, net of accumulated amortization/depreciation of $(159) and $(157)	32	33
Other assets	75	79
Total assets	72,039	68,797
Liabilities	'	'
Deposits	560	544
Consolidated obligations, net -	'	'
Discount notes, $0 and $75 carried at fair value	26,889	31,089
Bonds, $3,408 and $1,021 carried at fair value	39,183	31,987
Total consolidated obligations, net	66,072	63,076
Accrued interest payable	238	137
Mandatorily redeemable capital stock	5	5
Derivative liabilities	57	108
Affordable Housing Program assessment payable	80	78
Other liabilities	113	140
Subordinated notes	944	944
Total liabilities	68,069	65,032
Commitments and Contingencies	'	'
Capital	'	'
Class B1 - putable $100 par value - 6 million and 6 million shares issued and outstanding	588	629
Class B2 - putable $100 par value - 11 million and 10 million shares issued and outstanding	1,117	1,041
Total Capital stock	1,705	1,670
Retained earnings - unrestricted	1,915	1,853
Retained earnings - restricted	192	175
Total retained earnings	2,107	2,028
Accumulated other comprehensive income (loss) (AOCI)	158	67
Total capital	3,970	3,765
Total liabilities and capital	$72,039	$68,797

Statements_of_Condition_Statem

Statements of Condition Statements of Condition Parenthetical (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, except Per Share data, unless otherwise specified
Statements of Condition Parenthetical [Abstract]	'	'
Trading securities pledged	$46	$32
Fair value of held-to-maturity securities	7,831	8,618
Advances carried at fair value	30	30
Allowance for credit losses on MPF Loans	-24	-29
Software and equipment, accumulated amortization and depreciation	-159	-157
Discount notes carried at fair value	0	75
Bonds carried at fair value	$3,408	$1,021
Capital stock par value	$100	$100
Class B1 shares issued	6	6
Class B2 shares issued	11	10
Class B1 shares outstanding	6	6
Class B2 shares outstanding	11	10

Statements_of_Income

Statements of Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]	'	'
Interest income	$355	$403
Interest expense	228	290
Net interest income before provision for credit losses	127	113
Provision for (reversal of) credit losses	-3	0
Net interest income	130	113
Non-interest gain (loss) on -	'	'
Trading securities	-5	-6
Derivatives and hedging activities	-14	2
Instruments held under fair value option	4	1
Other, net	5	4
Total non-interest gain (loss)	-10	1
Non-interest expense -	'	'
Compensation and benefits	16	14
Other operating expenses	10	9
FHFA	1	1
Office of Finance	1	1
Other	2	0
Total non-interest expense	30	25
Income before assessments	90	89
Affordable Housing Program assessment	9	9
Net income	$81	$80

Statements_of_Comprehensive_In

Statements of Comprehensive Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]	'	'
Net income	$81	$80
Other comprehensive income (loss) -	'	'
Net unrealized gain (loss) on available-for-sale securities	55	-85
Non-credit OTTI on available-for-sale securities	0	6
Net unrealized gain (loss) on held-to-maturity securities transferred from available-for-sale	0	1
Non-credit OTTI on held-to-maturity securities	14	15
Net unrealized gain (loss) on cash flow hedges	21	85
Post retirement plans - reclassification to net income	1	1
Other comprehensive income (loss)	91	23
Comprehensive income	$172	$103

Statements_of_Stockholders_Equ

Statements of Stockholders' Equity (USD $)	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							Capital Stock	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]	'	'	'	'	'	'	'	'
Proceeds from issuance of capital stock, shares	'	0	'	'	'	'	0	0
Repurchases of capital stock, shares	'	-1	'	'	'	'	0	-1
Capital stock reclassified to mandatorily redeemable capital stock, shares	'	0	'	'	'	'	0	0
Total comprehensive income	103	'	64	16	80	23	'	'
Proceeds from issuance of capital stock	38	38	'	'	'	'	38	0
Repurchases of capital stock	-96	-96	'	'	'	'	-1	-95
Capital stock reclassified to mandatorily redeemable capital stock	-43	-43	'	'	'	'	-43	0
Cash dividends - class B1	0	'	0	'	0	'	'	'
Cash dividends - class B2	-1	'	-1	'	-1	'	'	'
Balance, ending at Mar. 31, 2013	3,449	1,549	1,647	123	1,770	130	116	1,433
Shares, ending at Mar. 31, 2013	'	15	'	'	'	'	1	14
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]	'	'	'	'	'	'	'	'
Proceeds from issuance of capital stock, shares	'	1	'	'	'	'	1	0
Repurchases of capital stock, shares	'	-1	'	'	'	'	-1	0
Transfers between B1 and B2 capital stock, shares	'	'	'	'	'	'	-1	1
Total comprehensive income	172	'	64	17	81	91	'	'
Proceeds from issuance of capital stock	85	85	'	'	'	'	84	1
Repurchases of capital stock	-50	-50	'	'	'	'	-17	-33
Capital stock reclassified to mandatorily redeemable capital stock	0	'	'	'	'	'	'	'
Transfers between B1 and B2 capital stock	'	'	'	'	'	'	-108	108
Cash dividends - class B1	-1	'	-1	'	-1	'	'	'
Cash dividends - class B2	-1	'	-1	'	-1	'	'	'
Balance, ending at Mar. 31, 2014	$3,970	$1,705	$1,915	$192	'	$158	$588	$1,117
Shares, ending at Mar. 31, 2014	'	17	'	'	'	'	6	11

Statements_of_Stockholders_Equ1

Statements of Stockholders' Equity Statements of Capital Parenthetical	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Capital Stock - Putable - B1	'	'
Capital Unit [Line Items]	'	'
Common Stock Dividend - Rate per Share	1.30%	0.30%
Capital Stock - Putable - B2	'	'
Capital Unit [Line Items]	'	'
Common Stock Dividend - Rate per Share	0.30%	0.30%

Statements_of_Cash_Flows

Statements of Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Operating	'		'
Net cash provided by (used in) operating activities	$257		$311
Investing	'		'
Net change Federal Funds sold	-2,384		-926
Net change securities purchased under agreements to resell	-1,850		665
Net change interest bearing deposits	-560		0
Advances -	'		'
Principal collected	59,419		62,471
Issued	-58,271		-62,368
MPF Loans held in portfolio-	'		'
Principal collected	410		786
Purchases	-11		-13
Trading securities -	'		'
Sales	550		0
Proceeds from maturities and paydowns	13		244
Purchases	-1,812		-1,000
Held-to-maturity securities-	'		'
Short-term held-to-maturity securities, net	555	[1]	705	[1]
Proceeds from maturities	262		494
Purchases	-11		-3
Available-for-sale securities -	'		'
Proceeds from maturities and sales	287		314
Proceeds from sale of foreclosed assets	14		25
Capital expenditures for software and equipment	-2		-1
Net cash provided by (used in) investing activities	-3,391		1,393
Financing	'		'
Net change deposits	16		3
Net proceeds from issuance of consolidated obligations -	'		'
Discount notes	218,709		199,066
Bonds	8,425		4,453
Payments for maturing and retiring consolidated obligations -	'		'
Discount notes	-222,910		-206,037
Bonds	-1,369		-2,189
Net proceeds (payments) on derivative contracts with financing element	-15		-18
Proceeds from issuance of capital stock	85		38
Repurchase or redemption of capital stock	-50		-96
Redemptions of mandatorily redeemable capital stock	0		-45
Cash dividends paid	-2		-1
Net cash provided by (used in) financing activities	2,889		-4,826
Net increase (decrease) in cash and due from banks	-245		-3,122
Cash and due from banks at beginning of year	971		3,564
Cash and due from banks at end of period	726		442
Supplemental	'		'
Capital stock reclassified to mandatorily redeemable capital stock	0		43
Transfer of MPF Loans to real estate owned	$18		$23
[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	3 Months Ended
	Mar. 31, 2014
Background [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.
	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.
	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. Our determination that we are not the primary beneficiary was based on our assessment that we do not have the right to direct the activities of and/or have the obligation to absorb losses or receive benefits from our investments in variable interest entities that would be significant to the variable interest entities. Further, we have not provided financial or other support (explicitly or implicitly) during the periods presented in our financial statements to these variable interest entities that we were not previously contractually required to provide nor do we intend to provide such support in the future. Accordingly, we do not consolidate any of our variable interest entities. The carrying amounts and classification of our investments in these variable interest entities are shown in investment securities in our statements of condition. We have no liabilities related to these investments in variable interest entities. Our maximum loss exposure for our variable interest entities is limited to the carrying amount.
	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.
	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 receivable or payable for all of our transactions through a particular clearing agent with a particular clearinghouse.
	Separately, we do not have any securities sold under agreements to repurchase, nor do we have any securities borrowing or lending transactions as of March 31, 2014.
	Restricted Retained Earnings
	We present restricted retained earnings resulting from the Joint Capital Enhancement Agreement as a separate line item in the Capital section of our statement of condition. This restricted retained earnings amount does not represent expenses or losses determined under GAAP. Further, we do not charge our expenses or losses to this restricted retained earnings amount nor do we transfer any of the restricted retained earnings amount to net income. Refer to Joint Capital Enhancement Agreement on page F-48 in our 2013 Form 10-K for further details.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 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.

Recently_Issued_but_Not_Yet_Ad

Recently Issued but Not Yet Adopted Accounting Standards	3 Months Ended
	Mar. 31, 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
	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. The new guidance may be adopted under either the modified retrospective transition method or the prospective transition method. We are in the process of determining its effect, if any, on our financial statements and operating activities.
	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 establishes 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 are in the process of determining the financial statement effects, if any, of implementing AB 2012-02 charge-off provisions on our financial condition, results of operations, and cash flows.

Interest_Income_and_Interest_E

Interest Income and Interest Expense	3 Months Ended
	Mar. 31, 2014
Interest Income and Interest Expense [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 March 31,
		2014			2013
	Interest income -
	Federal Funds sold, securities purchased under agreements to resell, and interest bearing deposits	$	1		$	4
	Investment securities -
	Trading	7			6
	Available-for-sale	143			149
	Held-to-maturity	77			90
	Total investment securities	227			245
	Advances -
	Advances interest income	38			36
	Advance prepayment fees	1			5
	Total Advances	39			41
	MPF Loans held in portfolio, net	88			113
	Total interest income	355			403
	Interest expense -
	Consolidated obligations -
	Discount notes	67			77
	Bonds	147			199
	Total consolidated obligations	214			276
	Subordinated notes	14			14
	Total interest expense	228			290
	Net interest income before provision for credit losses	127			113
	Provision for (reversal of) credit losses	(3		)	—
	Net interest income	$	130		$	113

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 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 consists of mortgage-backed securities (MBS) issued by Fannie Mae and Freddie Mac.
	•	Government-guaranteed residential consists of MBS issued by Ginnie Mae.
	•	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 $46 million of investment securities as collateral for our initial margin with derivative clearing organizations as of March 31, 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:
	As of		March 31, 2014			December 31, 2013
	U.S. Government & other government related		$	3,069		$	1,823
	MBS:
	GSE residential		71			74
	Government-guaranteed residential		2			2
	Total MBS		73			76
	Trading securities		$	3,142		$	1,899
	At March 31, 2014, and 2013, we had net year-to-date unrealized gains (losses) of $(5) million and $(6) 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 March 31, 2014
	U.S. Government & other government related	$	524		$	30		$	—			$	554
	FFELP ABS	6,272			446			(6		)		6,712
	MBS:
	GSE residential	10,807			532			(14		)		11,325
	Government-guaranteed residential	2,521			114			—				2,635
	Private-label residential	68			5			—				73
	Total MBS	13,396			651			(14		)		14,033
	Total	$	20,192		$	1,127		$	(20	)		$	21,299
	As of December 31, 2013
	U.S. Government & other government related	$	560		$	29		$	(1	)		$	588
	FFELP ABS	6,395			425			(17		)		6,803
	MBS:
	GSE residential	10,888			518			(24		)		11,382
	Government-guaranteed residential	2,572			119			—				2,691
	Private-label residential	69			3			—				72
	Total MBS	13,529			640			(24		)		14,145
	Total	$	20,484		$	1,094		$	(42	)		$	21,536
	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 March 31, 2014
	U.S. Government & other government related	$	1,650		$	—		$	1,650			$	55		$	(1	)	$	1,704
	State or local housing agency	21			—			21				—			—			21
	MBS:
	GSE residential	3,064			—			3,064				192			—			3,256
	Government-guaranteed residential	1,226			—			1,226				30			—			1,256
	Private-label residential	1,474			(306		)	1,168				428			(2		)	1,594
	Total MBS	5,764			(306		)	5,458				650			(2		)	6,106
	Total	$	7,435		$	(306	)	$	7,129			$	705		$	(3	)	$	7,831
	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
	MBS:
	GSE residential	3,193			—			3,193				186			—			3,379
	Government-guaranteed residential	1,248			—			1,248				32			—			1,280
	Private-label residential	1,515			(320		)	1,195				444			(2		)	1,637
	Total MBS	5,956			(320		)	5,636				662			(2		)	6,296
Total	$	8,237		$	(320	)	$	7,917			$	704		$	(3	)	$	8,618
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 March 31, 2014
FFELP ABS	$	4		$	—		$	963			$	(6	)	$	967		$	(6	)
MBS:
GSE residential	—			—			2,828				(14		)	2,828			(14		)
Government-guaranteed residential	30			—			—				—			30			—
Private-label residential	—			—			1				—			1			—
Total MBS	30			—			2,829				(14		)	2,859			(14		)
Total	$	34		$	—		$	3,792			$	(20	)	$	3,826		$	(20	)
As of December 31, 2013
U.S. Government & other government related	$	40		$	(1	)	$	—			$	—		$	40		$	(1	)
FFELP ABS	22			—			969				(17		)	991			(17		)
MBS:
GSE residential	—			—			3,293				(24		)	3,293			(24		)
Private-label residential	—			—			9				—			9			—
Total 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 March 31, 2014
U.S. Government & other government related	$	19		$	(1	)	$	2			$	—		$	21		$	(1	)
State or local housing agency	10			—			—				—			10			—
MBS:
GSE residential	41			—			—				—			41			—
Private-label residential	—			—			1,493				(308		)	1,493			(308		)
Total MBS	41			—			1,493				(308		)	1,534			(308		)
Total	$	70		$	(1	)	$	1,495			$	(308	)	$	1,565		$	(309	)
As of December 31, 2013
U.S. Government & other government related	$	85		$	(1	)	$	—			$	—		$	85		$	(1	)
State or local housing agency	10			—			—				—			10			—
MBS:
GSE residential	10			—			—				—			10			—
Private-label residential	—			—			1,532				(322		)	1,532			(322		)
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 March 31, 2014		Amortized Cost Basis			Carrying Amount and Fair Value			Carrying Amount				Fair
												Value
Year of Maturity -
Due in one year or less		$	—		$	—		$	113			$	113
Due after one year through five years		119			126			57				57
Due after five years through ten years		3			3			423				439
Due after ten years		402			425			1,078				1,116
ABS and MBS without a single maturity date		19,668			20,745			5,458				6,106
Total securities		$	20,192		$	21,299		$	7,129			$	7,831
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 Committee. We use the information provided to generate cash flow projections used in analyzing credit losses and determining OTTI for private-label MBS. The OTTI Committee was formed by the FHLBs to achieve consistency among the FHLBs in their analyses of the OTTI of private-label MBS. 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.  Based on these inputs and assumptions for the three months ended March 31, 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 March 31, 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		$	102		$	67		$	—			$	5		$	72		$	72
OTTI HTM Securities-
Private-label residential MBS:
Prime		$	1,124		$	883		$	(222	)		$	—		$	661		$	934
Subprime		696			435			(84		)		—			351			504
Total OTTI HTM securities		$	1,820		$	1,318		$	(306	)		$	—		$	1,012		$	1,438

Advances

Advances	3 Months Ended
	Mar. 31, 2014
Advances [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. The following table presents our advances by callable/putable features:
	As of		March 31, 2014		December 31, 2013
	Noncallable/nonputable		$	19,573	$	20,259
	Callable		990		1,440
	Putable		1,714		1,726
	Total par value		22,277		23,425
	Hedging adjustments		70		39
	Other adjustments		25		25
	Total advances		$	22,372	$	23,489
	The following table presents our advances by redemption terms:
	As of March 31, 2014		Amount		Weighted Average Interest Rate			Next Maturity or Call Date		Next Maturity or Put Date
	Due in one year or less		$	4,094	0.67	%		$	5,084	$	5,807
	One to two years		1,983		1.46	%		1,883		1,550
	Two to three years		1,788		3.05	%		1,588		1,288
	Three to four years		4,146		1.11	%		3,761		3,477
	Four to five years		8,861		0.27	%	a	8,561		8,775
	More than five years		1,405		3.45	%		1,400		1,380
	Total par value		$	22,277	1.03	%		$	22,277	$	22,277
	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	3 Months Ended
	Mar. 31, 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	March 31, 2014			December 31, 2013
	Medium term (15 years or less)	$	1,517		$	1,672
	Long term (greater than 15 years)	5,714			5,959
	Total unpaid principal balance	7,231			7,631
	Net premiums, credit enhancement and deferred loan fees	26			27
	Hedging adjustments	61			66
	Total before allowance for credit losses	7,318			7,724
	Allowance for credit losses on MPF Loans	(24		)	(29		)
	Total MPF Loans held in portfolio, net	$	7,294		$	7,695
	Conventional mortgage loans	$	5,632		$	5,969
	Government insured mortgage loans	1,599			1,662
	Total unpaid principal balance	$	7,231		$	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	3 Months Ended
	Mar. 31, 2014
Allowance for Credit Losses [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		March 31, 2014				December 31, 2013
	Total Severity Rate		33		%		35		%
	Credit Loss Severity Rate		18		%		19		%
	Total estimated losses outstanding		$	72			$	65
	Less: losses expected to be absorbed by MPF Risk Sharing Structure		(30		)	a	(18		)	a
	Our share of total losses		42				47
	Less: non-credit losses		(19		)		(21		)
	Credit losses		23				26
	Plus: other estimated credit losses in the remaining portfolio		1				3
	Allowance for credit losses on conventional MPF Loans		$	24			$	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
			March 31, 2014				March 31, 2013
	Balance, beginning of period		$	29			$	42
	Losses charged to the allowance		(2		)		(2		)
	Provision for (reversal of) credit losses		(3		)		—
	Balance, end of period		$	24			$	40
	The following table presents the recorded investment by impairment methodology.
	As of		March 31, 2014				December 31, 2013
	Specifically identified and individually evaluated for impairment		$	19			$	22
	Homogeneous pools of loans and collectively evaluated for impairment		5				7
	Allowance for credit losses on conventional MPF Loans		$	24			$	29
	Individually evaluated for impairment - with an allowance		$	200			$	215
	Collectively evaluated for impairment		5,531				5,861
	Total recorded investment		$	5,731			$	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 issuer 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.
			March 31, 2014											December 31, 2013
	As of		Conventional				Government				Total			Conventional			Government			Total
	Past due 30-59 days		$	142			$	84			$	226		$	165		$	104		$	269
	Past due 60-89 days		47				24				71			50			31			81
	Past due 90 days or more		188				141				329			202			151			353
	Total past due		377				249				626			417			286			703
	Total current		5,354				1,375				6,729			5,659			1,401			7,060
	Total recorded investment		$	5,731			$	1,624			$	7,355		$	6,076		$	1,687		$	7,763
	In process of foreclosure		$	102			$	56			$	158		$	108		$	51		$	159
	Serious delinquency rate	a	3.33		%		8.74		%		4.52		%	2.81		%	7.44		%	3.82		%
	Past due 90 days or more still accruing interest	b	$	26			$	142			$	168		$	27		$	151		$	178
	On nonaccrual status		$	204			$	—			$	204		$	221		$	—		$	221
	a	MPF Loans that are 90 days or more past due or in the process of foreclosure as a percentage of the total recorded investment.
	b	Consists of MPF Loans that are either government mortgage loans 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.
			March 31, 2014											December 31, 2013
	As of		Performing				Nonperforming				Total			Performing			Nonperforming			Total
	Recorded investment in conventional MPF Loan TDRs		$	36			$	22			$	58		$	16		$	43		$	59
	The following table shows the troubled debt restructurings we made on our conventional MPF Loans for the periods presented. A borrower is considered to have defaulted on a TDR if contractually due principal or interest payment is sixty days past due at any time during the past 12 months.
		For the three months ended March 31,
		2014			2013
TDRs made during the periods		$6			$7
TDRs from the previous 12 months that subsequently defaulted during the periods		15			8
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.
		March 31, 2014											December 31, 2013
As of		Recorded Investment				Unpaid Principal Balance				Related Allowance			Recorded Investment			Unpaid Principal Balance			Related Allowance
Impaired conventional MPF Loans with an allowance		$	200			$	197			$	19		$	215		$	210		$	22
The following table summarizes the average recorded investment of impaired conventional MPF Loans. No interest income is recognized on impaired loans.
		For the three months ended
		31-Mar-14				31-Mar-13
Average Recorded Investment		$	204			$	224
Term Federal Funds Sold and Term Securities Purchased Under Agreements to Resell
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 March 31, 2014.
Based upon the collateral held as security, we have determined that no allowance for credit losses was needed for our securities purchased under agreements to resell as of March 31, 2014.

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 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 $52 million of collateral at fair value to our derivatives counterparties at March 31, 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 March 31, 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 $46 million of investment securities, of which $2 million can be sold or repledged, as part of our initial margin related to cleared derivative transactions at March 31, 2014.
	The following table presents our gross and net derivative assets and liabilities by contract type and amount for our derivative agreements for which offsetting is permissible under U.S. GAAP.
			March 31, 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		$	30,441			$	63			$	1,502			$	28,346		$	85			$	1,670
	Total		30,441				63				1,502				28,346			85				1,670
	Derivatives not in hedge accounting relationships-
	Interest rate swaps		17,948				453				285				14,199			440				286
	Interest rate swaptions		3,355				52				—				4,465			60				—
	Interest rate caps or floors		1,164				132				—				1,164			143				—
	Interest rate future forwards		4				—				—				—			—				—
	Mortgage delivery commitments		214				2				2				203			3				3
	Total		22,685				639				287				20,031			646				289
	Total before adjustments		$	53,126			702				1,789				$	48,377		731				1,959
	Netting adjustments excluding cash collateral						(654		)		(654		)					(677		)		(677		)
	Exposure at fair value						48			a	1,135							54			a	1,282
	Cash collateral and related accrued interest on the collateral						(10		)		(1,078		)					(19		)		(1,174		)
	Derivative assets and liabilities						$	38			$	57						$	35			$	108
	a   Includes derivative net accrued interest receivable of $13 million as of March 31, 2014, and $6 million as of December 31, 2013.
	The following table presents our gross recognized amount of offsetting derivative assets and liabilities for derivative instruments with legal right of offset as well as derivative instruments (i.e., mortgage delivery commitments) without the legal right of offset.
							March 31, 2014											31-Dec-13
	As of						Derivative Assets				Derivative Liabilities							Derivative Assets				Derivative Liabilities
	Derivative instruments with legal right of offset
	Bilateral derivatives						$	685			$	1,689						$	707			$	1,949
	Cleared derivatives						15				98							21				7
	Gross recognized amount						700			a	1,787							728			a	1,956
	Bilateral derivatives						(652		)		(1,634		)					(676		)		(1,845		)
	Cleared derivatives						(12		)		(98		)					(20		)		(6		)
	Gross amounts of netting adjustments and cash collateral						(664		)		(1,732		)					(696		)		(1,851		)
	Bilateral derivatives						33				55							31				104
	Cleared derivatives						3				—							1				1
	Net amounts after offsetting adjustments						36				55							32				105
	Bilateral derivatives without legal right of offset						2				2							3				3
	Total bilateral derivatives						35				57							34				107
	Total cleared derivatives						3				—							1				1
	Total derivatives on statements of condition						38				57							35				108
	Bilateral derivatives noncash collateral not offset that cannot be sold or repledged						30				—							31				—
	Net amount bilateral derivatives						5				57							3				107
	Net amount cleared derivatives						3				—							1				1
	Net amount of derivatives						$	8		b	$	57		b				$	4		b	$	108		b
	Liability positions with credit exposure										$	6										$	—
	a	Includes derivative net accrued interest receivable of $13 million as of March 31, 2014, and $6 million as of December 31, 2013.
	b	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 components of derivatives and hedging activities as presented in the statements of income.
			Three months ended March 31,
	For the periods ending		2014				2013
	Fair value hedges -
	Interest rate swaps		$	(6	)		$	2
	Fair value hedges - ineffectiveness net gain (loss)		(6		)		2
	Cash flow hedges - ineffectiveness net gain (loss)		1				1
	Economic hedges -
	Interest rate swaps		1				11
	Interest rate swaptions		(15		)		(6		)
	Interest rate caps/floors		(10		)		(19		)
	Net interest settlements		15				13
Economic hedges - net gain (loss)		(9		)		(1		)
Net gains (losses) on derivatives and hedging activities		$	(14	)		$	2
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) on Derivative				Gain (Loss) on Hedged Item				Total Ineffectiveness Gain (Loss) Recognized in Derivatives and Hedging Activities				Net Interest Settlements Classified in Net Interest Income a			Hedge Adjustments Amortized into Net Interest Income b
Three months ended March 31, 2014
Hedged item type -
Available-for-sale securities	$	(2	)		$	1			$	(1	)		$	(35	)	$	—
Advances	(30		)		32				2				(20		)	(1		)
MPF Loans held for portfolio	—				—				—				—			(5		)
Consolidated obligation bonds	133				(140		)		(7		)		61			(5		)
Total	$	101			$	(107	)		$	(6	)		$	6		$	(11	)
Three months ended March 31, 2013
Hedged item type -
Available-for-sale securities	$	56			$	(55	)		$	1			$	(34	)	$	—
Advances	26				(23		)		3				(17		)	(1		)
MPF Loans held for portfolio	—				—				—				—			(10		)
Consolidated obligation bonds	(87		)		85				(2		)		47			(7		)
Total	$	(5	)		$	7			$	2			$	(4	)	$	(18	)
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 a
Three months ended March 31, 2014
Advances -	$	3			$	—			$	3			$	—		$	(3	)		$	—
interest rate floors
Discount notes -	(1		)		1				—				24			24				(61		)
interest rate swaps
Total	$	2			$	1			$	3			$	24		$	21			$	(61	)
Three months ended March 31, 2013
Advances -	$	3			$	—			$	3			$	—		$	(3	)		$	—
interest rate floors
Discount notes -	(1		)		1				—				88			88				(67		)
interest rate swaps
Total	$	2			$	1			$	3			$	88		$	85			$	(67	)
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 March 31, 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	3 Months Ended
	Mar. 31, 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 March 31, 2014	Contractual Maturity			Weighted Average Interest Rate			Next Maturity or Call Date
	Due in one year or less	$	9,541		2.07	%		$	30,776
	One to two years	2,270			3.03	%		3,170
	Two to three years	4,127			2.36	%		2,137
	Three to four years	4,845			2.31	%		2,100
	Four to five years	5,813			1.34	%		120
	Thereafter	12,951			2.17	%		1,244
	Total par value	$	39,547		2.11	%		$	39,547
	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	31-Mar-14			December 31, 2013
	Carrying Amount	$	26,889		$	31,089
	Par Value	26,891			31,092
	Weighted Average Interest Rate	0.06		%	0.07		%
	The following table presents consolidated obligation bonds outstanding by call feature:
	As of	31-Mar-14			31-Dec-13
	Noncallable	$	15,792		$	12,927
	Callable	23,755			19,565
	Total par value	39,547			32,492
	Bond premiums (discounts), net	19			20
	Hedging adjustments	(381		)	(526		)
	Fair value option adjustments	(2		)	1
	Total consolidated obligation bonds	$	39,183		$	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 March 31, 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 March 31, 2014 and December 31, 2013.
	The following table summarizes the consolidated obligations of the FHLBs and those for which we are the primary obligor:
		March 31, 2014										31-Dec-13
	Par values as of	Bonds			Discount				Total			Bonds			Discount			Total
					Notes										Notes
	FHLB System	$	486,343		$	267,597			$	753,940		$	473,495		$	293,342		$	766,837
	FHLB Chicago as primary obligor	39,547			26,891				66,438			32,492			31,092			63,584
	As a percent of the FHLB System	8		%	10		%		9		%	7		%	11		%	8		%

Capital_and_Mandatorily_Redeem

Capital and Mandatorily Redeemable Capital Stock	3 Months Ended
	Mar. 31, 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 2.0% and 6.0% of a member's outstanding advances. During 2013, our Board implemented this provision for the first time through a Reduced Capitalization Advance Program (RCAP) offered during the fourth quarter of 2013 that allowed members to borrow one or more advances with an activity stock requirement of only 2.0% as further discussed in Note 14 - Capital and Mandatorily Redeemable Capital Stock to the financial statements in our 2013 Form 10-K.
	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 first 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, 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:
		March 31, 2014						December 31, 2013
		Requirement			Actual			Requirement			Actual
	Risk-based capital	$	1,291		$	3,817		$	1,465		$	3,703
	Total regulatory capital	$	2,882		$	3,817		$	2,752		$	3,703
	Total regulatory capital ratio	4		%	5.3		%	4		%	5.38		%
	Leverage capital	$	3,602		$	5,725		$	3,440		$	5,555
	Leverage capital ratio	5		%	7.95		%	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)	3 Months Ended
	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [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 Gain (Loss)			Non-credit OTTI			Net Unrealized Gain (Loss)			Non-credit OTTI			Net Unrealized on Cash Flow Hedges			Post-Retirement Plans		Total AOCI
	For the three months ended March 31, 2013
	Beginning balance	$	1,576		$	(8	)	$	(3	)	$	(381	)	$	(1,078	)	$	1	$	107
	Net change in the period	(85		)	6			1			15			85			1		23
	Ending balance	$	1,491		$	(2	)	$	(2	)	$	(366	)	$	(993	)	$	2	$	130
	For the three months ended March 31, 2014
	Beginning balance	$	1,052		$	—		$	(1	)	$	(320	)	$	(665	)	$	1	$	67
	Change in the period before reclassifications to net income	55			—			—			14			24			—		93
	Period amounts reclassified to:
	Net interest income	—			—			—			—			(2		)	—		(2		)
	Non-interest gain (loss)	—			—			—			—			(1		)	—		(1		)
	Non-interest expense	—			—			—			—			—			1		1
	Net change in the period	55			—			—			14			21			1		91
	Ending balance	$	1,107		$	—		$	(1	)	$	(306	)	$	(644	)	$	2	$	158

Fair_Value_Accounting

Fair Value Accounting	3 Months Ended
	Mar. 31, 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. Financial instruments carried at fair value using Level 3 inputs were immaterial at March 31, 2014. 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.
	•	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.
										Fair Value Hierarchy
		Carrying Amount				Fair Value				Level 1				Level 2				Level 3
	March 31, 2014
	Financial Assets-
	Cash and due from banks	$	726			$	726			$	726			$	—			$	—
	Interest bearing deposits	560				560				560				—				—
	Federal Funds sold	2,884				2,884				—				2,884				—
	Securities purchased under agreements to resell	6,400				6,400				—				6,400				—
	Held-to-maturity securities	7,129				7,831				—				6,237				1,594
	Advances	22,372				22,489				—				22,489				—
	MPF Loans held in portfolio, net	7,294				7,842				—				7,654				188
	Accrued interest receivable	88				88				—				88				—
	Financial Liabilities-
	Deposits	$	(560	)		$	(560	)		$	—			$	(560	)		$	—
	Consolidated obligation discount notes	(26,889		)		(26,889		)		—				(26,889		)		—
	Consolidated obligation bonds	(39,183		)		(39,835		)		—				(39,769		)		(66		)	a
	Accrued interest payable	(238		)		(238		)		—				(238		)		—
	Mandatorily redeemable capital stock	(5		)		(5		)		(5		)		—				—
	Subordinated notes	(944		)		(1,045		)		—				(1,045		)		—
	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 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. We had no level 1 instruments for either period presented.
	As of March 31, 2014		Level 2				Level 3				Netting Adjustment				Total
	Financial assets -
	Trading securities:
	U.S. Government & other government related		$	3,069			$	—			$	—			$	3,069
	GSE residential MBS		71				—				—				71
	Governmental-guaranteed residential MBS		2				—				—				2
	Trading securities		3,142				—				—				3,142
	Available-for-sale securities:
	U.S. Government & other government related		554				—				—				554
	FFELP ABS		6,712				—				—				6,712
	GSE residential MBS		11,325				—				—				11,325
	Government-guaranteed residential MBS		2,635				—				—				2,635
	Private-label residential MBS		—				73				—				73
	Available-for-sale securities		21,226				73				—				21,299
	Advances		30				—				—				30
	Derivative assets		686			a	16			a	(664		)	b	38
	Total financial assets at fair value		$	25,084			$	89			$	(664	)		$	24,509
	Level 3 as a percent of total assets at fair value						0.4		%
	Financial liabilities -
Consolidated obligation bonds		$	(3,408	)		$	(66	)	c	$	—			$	(3,474	)
Derivative liabilities		(1,789		)	a	—				1,732			b	(57		)
Total financial liabilities at fair value		$	(5,197	)		$	(66	)		$	1,732			$	(3,531	)
Level 3 as a percent of total liabilities at fair value						1.9		%
Table continued on next page.
As of December 31, 2013		Level 2				Level 3				Netting Adjustment				Total
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			a	19			a	(696		)	b	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		)	c	—				(1,090		)
Derivative liabilities		(1,959		)	a	—				1,851			b	(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	Our derivative assets are, in part secured with cash collateral (Level 1) as described in Note 9 - Derivatives and Hedging Activities. However, we view our net derivative assets or liabilities as a single unit of account for purposes of classifying the total balance within the fair value hierarchy. Accordingly, we classify our derivative assets and liabilities as either Level 2 or Level 3 within the fair value hierarchy.
b	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.
c	Amount represents debt carried at fair value under a 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
The following table presents a reconciliation of assets and liabilities that are measured at fair value on the statements of condition using significant unobservable inputs (Level 3):
		Available-For-Sale								Derivative Assets Interest-Rate Related								Consolidated Obligation Bonds
		Private-Label MBS
For the three months ended		2014				2013				2014				2013				2014				2013
Balance at beginning of period		$	72			$	69			$	19			$	32			$	(69	)		$	(82	)
Gains (losses) realized and unrealized:
Change in fair value recorded in earnings - Instruments held under fair value option		—				—				—				—				—				6
Recorded in earnings in interest income		1				1				—				—				—				—
Recorded in net unrealized gain/loss on AFS in OCI		2				—				—				—				—				—
Change in fair value recorded in OCI -		—				6				—				—				—				—
Non-credit OTTI on AFS securities
Change in fair value recorded in earnings - Derivatives and hedging activities		—				—				(3		)		(5		)		3				—
Paydowns and settlements		(2		)		(3		)		—				—				—				—
Balance at end of period		$	73			$	73			$	16			$	27			$	(66	)		$	(76	)
Total unrealized gains (losses) recorded in earnings (derivatives and hedging activities) and attributable to instruments still held at period end		$	1			$	—			$	—			$	—			$	3			$	5
Assets Measured at Fair Value on a Nonrecurring Basis
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. These assets 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. Held-to-maturity, private-label residential MBS are measured at fair value using the same methodology and significant assumptions utilized for available-for-sale private-label residential MBS. 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.
		March 31, 2014				December 31, 2013
		Level  3				Level  3
Impaired MPF Loans		$	188			$	200
Real estate owned		10				10
Total non-recurring assets		$	198			$	210
Fair Value Option
We elected the fair value option for advances, discount notes, and short-term 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.
The following table summarizes the activity related to financial assets and liabilities for which we elected the fair value option:
	March 31, 2014												March 31, 2013
					Consolidated Obligation												Consolidated Obligation
	Advances				Bonds				Discount Notes				Advances				Bonds				Discount Notes
For the three months ended
Balance beginning of period	$	30			$	(1,021	)		$	(75	)		$	9			$	(1,251	)		$	—
New transactions elected for fair value option	—				(2,660		)		—				—				(250		)		(75		)
Maturities and extinguishments (if any)	—				270				75				—				250				—
Net gain (loss) on instruments held at fair value	—				4				—				—				1				—
Change in accrued interest and other	—				(1		)		—				—				—				—
Balance end of period	$	30			$	(3,408	)		$	—			$	9			$	(1,250	)		$	(75	)
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 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.
		March 31, 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		$	30			$	30			$	—			$	29			$	30			$	1
Consolidated obligation discount notes		—				—				—				75				75				—
Consolidated obligation bonds		3,410				3,408				(2		)		1,020				1,021				1

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 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.
			March 31, 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		$	1,010		$	—		$	1,010	$	220		$	—		$	220
	Unsettled consolidated obligation discount notes		—			—			—		1,000			—			1,000
	Member standby letters of credit		1,045			616		b	1,661		1,407			696		b	2,103
	Housing authority standby bond purchase agreements		237			116			353		149			258			407
	MPF Program mortgage purchase commitments		109			—			109		103			—			103
	Unresolved repurchasable loans and indemnifications to Fannie Mae for MPF Xtra loans		74		a	—			74		56		a	—			56
	Committed unused member lines of credit		4,000			—			4,000		—			—			—
	Advance commitments		157			57			214		125			101			226
	Commitments		$	6,632		$	789		$	7,421	$	3,060		$	1,055		$	4,115
	a	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.
	b	Contains $399 million and $495 million of letters of credit which are renewable annually.
	For a description of previously defined terms see Note 18 - Commitments and Contingencies to the financial statements in our 2013 Form 10-K.
	Committed unused member lines of credit. A line-of-credit is an agreement that provides our members with the option to take multiple advances up to a specified maximum amount. Portions repaid may be reborrowed under the same arrangement.

Transactions_with_Members_and_

Transactions with Members and Other FHLBs	3 Months Ended
	Mar. 31, 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.
		March 31, 2014		December 31, 2013
	Assets - Advances	$	179	$	2,546
	Liabilities - Deposits	24		27
	Equity - Capital Stock	17		188
	Other FHLBs
	Material amounts of transactions with other FHLBs, if any, are parenthetically identified on the face of our Financial Statements.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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.

Interest_Income_and_Interest_E1

Interest Income and Interest Expense (Tables)	3 Months Ended
	Mar. 31, 2014
Interest Income and Interest Expense [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 March 31,
		2014			2013
	Interest income -
	Federal Funds sold, securities purchased under agreements to resell, and interest bearing deposits	$	1		$	4
	Investment securities -
	Trading	7			6
	Available-for-sale	143			149
	Held-to-maturity	77			90
	Total investment securities	227			245
	Advances -
	Advances interest income	38			36
	Advance prepayment fees	1			5
	Total Advances	39			41
	MPF Loans held in portfolio, net	88			113
	Total interest income	355			403
	Interest expense -
	Consolidated obligations -
	Discount notes	67			77
	Bonds	147			199
	Total consolidated obligations	214			276
	Subordinated notes	14			14
	Total interest expense	228			290
	Net interest income before provision for credit losses	127			113
	Provision for (reversal of) credit losses	(3		)	—
	Net interest income	$	130		$	113

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2014
Investment Securities [Line Items]	'
Trading Securities by Major Security Type [Table Text Block]	'
	The following table presents the fair value of our trading securities:
	As of		March 31, 2014			December 31, 2013
	U.S. Government & other government related		$	3,069		$	1,823
	MBS:
	GSE residential		71			74
	Government-guaranteed residential		2			2
	Total MBS		73			76
	Trading securities		$	3,142		$	1,899
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 March 31, 2014
	U.S. Government & other government related	$	524		$	30		$	—			$	554
	FFELP ABS	6,272			446			(6		)		6,712
	MBS:
	GSE residential	10,807			532			(14		)		11,325
	Government-guaranteed residential	2,521			114			—				2,635
	Private-label residential	68			5			—				73
	Total MBS	13,396			651			(14		)		14,033
	Total	$	20,192		$	1,127		$	(20	)		$	21,299
	As of December 31, 2013
	U.S. Government & other government related	$	560		$	29		$	(1	)		$	588
	FFELP ABS	6,395			425			(17		)		6,803
	MBS:
	GSE residential	10,888			518			(24		)		11,382
	Government-guaranteed residential	2,572			119			—				2,691
	Private-label residential	69			3			—				72
	Total 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 March 31, 2014
	U.S. Government & other government related	$	1,650		$	—		$	1,650			$	55		$	(1	)	$	1,704
	State or local housing agency	21			—			21				—			—			21
	MBS:
	GSE residential	3,064			—			3,064				192			—			3,256
	Government-guaranteed residential	1,226			—			1,226				30			—			1,256
	Private-label residential	1,474			(306		)	1,168				428			(2		)	1,594
	Total MBS	5,764			(306		)	5,458				650			(2		)	6,106
	Total	$	7,435		$	(306	)	$	7,129			$	705		$	(3	)	$	7,831
	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
	MBS:
	GSE residential	3,193			—			3,193				186			—			3,379
	Government-guaranteed residential	1,248			—			1,248				32			—			1,280
	Private-label residential	1,515			(320		)	1,195				444			(2		)	1,637
	Total 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 March 31, 2014
	FFELP ABS	$	4		$	—		$	963			$	(6	)	$	967		$	(6	)
	MBS:
	GSE residential	—			—			2,828				(14		)	2,828			(14		)
	Government-guaranteed residential	30			—			—				—			30			—
	Private-label residential	—			—			1				—			1			—
	Total MBS	30			—			2,829				(14		)	2,859			(14		)
	Total	$	34		$	—		$	3,792			$	(20	)	$	3,826		$	(20	)
	As of December 31, 2013
	U.S. Government & other government related	$	40		$	(1	)	$	—			$	—		$	40		$	(1	)
	FFELP ABS	22			—			969				(17		)	991			(17		)
	MBS:
	GSE residential	—			—			3,293				(24		)	3,293			(24		)
	Private-label residential	—			—			9				—			9			—
	Total 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 March 31, 2014
	U.S. Government & other government related	$	19		$	(1	)	$	2			$	—		$	21		$	(1	)
	State or local housing agency	10			—			—				—			10			—
	MBS:
	GSE residential	41			—			—				—			41			—
	Private-label residential	—			—			1,493				(308		)	1,493			(308		)
	Total MBS	41			—			1,493				(308		)	1,534			(308		)
	Total	$	70		$	(1	)	$	1,495			$	(308	)	$	1,565		$	(309	)
	As of December 31, 2013
	U.S. Government & other government related	$	85		$	(1	)	$	—			$	—		$	85		$	(1	)
	State or local housing agency	10			—			—				—			10			—
	MBS:
	GSE residential	10			—			—				—			10			—
	Private-label residential	—			—			1,532				(322		)	1,532			(322		)
	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 March 31, 2014		Amortized Cost Basis			Carrying Amount and Fair Value			Carrying Amount				Fair
													Value
	Year of Maturity -
	Due in one year or less		$	—		$	—		$	113			$	113
	Due after one year through five years		119			126			57				57
	Due after five years through ten years		3			3			423				439
	Due after ten years		402			425			1,078				1,116
	ABS and MBS without a single maturity date		19,668			20,745			5,458				6,106
	Total securities		$	20,192		$	21,299		$	7,129			$	7,831
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 March 31, 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		$	102		$	67		$	—			$	5		$	72		$	72
	OTTI HTM Securities-
	Private-label residential MBS:
	Prime		$	1,124		$	883		$	(222	)		$	—		$	661		$	934
	Subprime		696			435			(84		)		—			351			504
	Total OTTI HTM securities		$	1,820		$	1,318		$	(306	)		$	—		$	1,012		$	1,438

Advances_Tables

Advances (Tables)	3 Months Ended
	Mar. 31, 2014
Advances [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. The following table presents our advances by callable/putable features:
	As of		March 31, 2014		December 31, 2013
	Noncallable/nonputable		$	19,573	$	20,259
	Callable		990		1,440
	Putable		1,714		1,726
	Total par value		22,277		23,425
	Hedging adjustments		70		39
	Other adjustments		25		25
	Total advances		$	22,372	$	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 March 31, 2014		Amount		Weighted Average Interest Rate			Next Maturity or Call Date		Next Maturity or Put Date
	Due in one year or less		$	4,094	0.67	%		$	5,084	$	5,807
	One to two years		1,983		1.46	%		1,883		1,550
	Two to three years		1,788		3.05	%		1,588		1,288
	Three to four years		4,146		1.11	%		3,761		3,477
	Four to five years		8,861		0.27	%	a	8,561		8,775
	More than five years		1,405		3.45	%		1,400		1,380
	Total par value		$	22,277	1.03	%		$	22,277	$	22,277
	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)	3 Months Ended
	Mar. 31, 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	March 31, 2014			December 31, 2013
	Medium term (15 years or less)	$	1,517		$	1,672
	Long term (greater than 15 years)	5,714			5,959
	Total unpaid principal balance	7,231			7,631
	Net premiums, credit enhancement and deferred loan fees	26			27
	Hedging adjustments	61			66
	Total before allowance for credit losses	7,318			7,724
	Allowance for credit losses on MPF Loans	(24		)	(29		)
	Total MPF Loans held in portfolio, net	$	7,294		$	7,695
	Conventional mortgage loans	$	5,632		$	5,969
	Government insured mortgage loans	1,599			1,662
	Total unpaid principal balance	$	7,231		$	7,631

Allowance_for_Credit_Losses_Ta

Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2014
Allowance for Credit Losses [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		March 31, 2014				December 31, 2013
	Total Severity Rate		33		%		35		%
	Credit Loss Severity Rate		18		%		19		%
	Total estimated losses outstanding		$	72			$	65
	Less: losses expected to be absorbed by MPF Risk Sharing Structure		(30		)	a	(18		)	a
	Our share of total losses		42				47
	Less: non-credit losses		(19		)		(21		)
	Credit losses		23				26
	Plus: other estimated credit losses in the remaining portfolio		1				3
	Allowance for credit losses on conventional MPF Loans		$	24			$	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
			March 31, 2014				March 31, 2013
	Balance, beginning of period		$	29			$	42
	Losses charged to the allowance		(2		)		(2		)
	Provision for (reversal of) credit losses		(3		)		—
	Balance, end of period		$	24			$	40
Schedule of Accounts, Notes, Loans and Financing Receivable by Impairment Methodology [Table Text Block]	'
	The following table presents the recorded investment by impairment methodology.
	As of		March 31, 2014				December 31, 2013
	Specifically identified and individually evaluated for impairment		$	19			$	22
	Homogeneous pools of loans and collectively evaluated for impairment		5				7
	Allowance for credit losses on conventional MPF Loans		$	24			$	29
	Individually evaluated for impairment - with an allowance		$	200			$	215
	Collectively evaluated for impairment		5,531				5,861
	Total recorded investment		$	5,731			$	6,076
Recorded Investment in Delinquent Mortgage Loans [Table Text Block]	'
	The table below summarizes our recorded investment in MPF Loans by our key credit quality indicators.
			March 31, 2014											December 31, 2013
	As of		Conventional				Government				Total			Conventional			Government			Total
	Past due 30-59 days		$	142			$	84			$	226		$	165		$	104		$	269
	Past due 60-89 days		47				24				71			50			31			81
	Past due 90 days or more		188				141				329			202			151			353
	Total past due		377				249				626			417			286			703
	Total current		5,354				1,375				6,729			5,659			1,401			7,060
	Total recorded investment		$	5,731			$	1,624			$	7,355		$	6,076		$	1,687		$	7,763
	In process of foreclosure		$	102			$	56			$	158		$	108		$	51		$	159
	Serious delinquency rate	a	3.33		%		8.74		%		4.52		%	2.81		%	7.44		%	3.82		%
	Past due 90 days or more still accruing interest	b	$	26			$	142			$	168		$	27		$	151		$	178
	On nonaccrual status		$	204			$	—			$	204		$	221		$	—		$	221
	a	MPF Loans that are 90 days or more past due or in the process of foreclosure as a percentage of the total recorded investment.
	b	Consists of MPF Loans that are either government mortgage loans 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.
			March 31, 2014											December 31, 2013
	As of		Performing				Nonperforming				Total			Performing			Nonperforming			Total
	Recorded investment in conventional MPF Loan TDRs		$	36			$	22			$	58		$	16		$	43		$	59
Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods [Table Text Block]	'
	The following table shows the troubled debt restructurings we made on our conventional MPF Loans for the periods presented. A borrower is considered to have defaulted on a TDR if contractually due principal or interest payment is sixty days past due at any time during the past 12 months.
			For the three months ended March 31,
			2014			2013
	TDRs made during the periods		$6			$7
	TDRs from the previous 12 months that subsequently defaulted during the periods		15			8
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.
			March 31, 2014											December 31, 2013
	As of		Recorded Investment				Unpaid Principal Balance				Related Allowance			Recorded Investment			Unpaid Principal Balance			Related Allowance
	Impaired conventional MPF Loans with an allowance		$	200			$	197			$	19		$	215		$	210		$	22
Average Recorded Investment of Individually Impaired Loans and Related Interest Income Recognized [Table Text Block]	'
	The following table summarizes the average recorded investment of impaired conventional MPF Loans. No interest income is recognized on impaired loans.
			For the three months ended
			31-Mar-14				31-Mar-13
	Average Recorded Investment		$	204			$	224

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Fair Value of Derivative Instruments [Table Text Block]	'
	The following table presents our gross and net derivative assets and liabilities by contract type and amount for our derivative agreements for which offsetting is permissible under U.S. GAAP.
			March 31, 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		$	30,441			$	63			$	1,502			$	28,346		$	85			$	1,670
	Total		30,441				63				1,502				28,346			85				1,670
	Derivatives not in hedge accounting relationships-
	Interest rate swaps		17,948				453				285				14,199			440				286
	Interest rate swaptions		3,355				52				—				4,465			60				—
	Interest rate caps or floors		1,164				132				—				1,164			143				—
	Interest rate future forwards		4				—				—				—			—				—
	Mortgage delivery commitments		214				2				2				203			3				3
	Total		22,685				639				287				20,031			646				289
	Total before adjustments		$	53,126			702				1,789				$	48,377		731				1,959
	Netting adjustments excluding cash collateral						(654		)		(654		)					(677		)		(677		)
	Exposure at fair value						48			a	1,135							54			a	1,282
	Cash collateral and related accrued interest on the collateral						(10		)		(1,078		)					(19		)		(1,174		)
	Derivative assets and liabilities						$	38			$	57						$	35			$	108
	a   Includes derivative net accrued interest receivable of $13 million as of March 31, 2014, and $6 million as of December 31, 2013.
	The following table presents our gross recognized amount of offsetting derivative assets and liabilities for derivative instruments with legal right of offset as well as derivative instruments (i.e., mortgage delivery commitments) without the legal right of offset.
							March 31, 2014											31-Dec-13
	As of						Derivative Assets				Derivative Liabilities							Derivative Assets				Derivative Liabilities
	Derivative instruments with legal right of offset
	Bilateral derivatives						$	685			$	1,689						$	707			$	1,949
	Cleared derivatives						15				98							21				7
	Gross recognized amount						700			a	1,787							728			a	1,956
	Bilateral derivatives						(652		)		(1,634		)					(676		)		(1,845		)
	Cleared derivatives						(12		)		(98		)					(20		)		(6		)
	Gross amounts of netting adjustments and cash collateral						(664		)		(1,732		)					(696		)		(1,851		)
	Bilateral derivatives						33				55							31				104
	Cleared derivatives						3				—							1				1
	Net amounts after offsetting adjustments						36				55							32				105
	Bilateral derivatives without legal right of offset						2				2							3				3
	Total bilateral derivatives						35				57							34				107
	Total cleared derivatives						3				—							1				1
	Total derivatives on statements of condition						38				57							35				108
	Bilateral derivatives noncash collateral not offset that cannot be sold or repledged						30				—							31				—
	Net amount bilateral derivatives						5				57							3				107
	Net amount cleared derivatives						3				—							1				1
	Net amount of derivatives						$	8		b	$	57		b				$	4		b	$	108		b
	Liability positions with credit exposure										$	6										$	—
	a	Includes derivative net accrued interest receivable of $13 million as of March 31, 2014, and $6 million as of December 31, 2013.
	b	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 components of derivatives and hedging activities as presented in the statements of income.
			Three months ended March 31,
	For the periods ending		2014				2013
	Fair value hedges -
	Interest rate swaps		$	(6	)		$	2
	Fair value hedges - ineffectiveness net gain (loss)		(6		)		2
	Cash flow hedges - ineffectiveness net gain (loss)		1				1
	Economic hedges -
	Interest rate swaps		1				11
	Interest rate swaptions		(15		)		(6		)
	Interest rate caps/floors		(10		)		(19		)
	Net interest settlements		15				13
	Economic hedges - net gain (loss)		(9		)		(1		)
	Net gains (losses) on derivatives and hedging activities		$	(14	)		$	2
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) on Derivative				Gain (Loss) on Hedged Item				Total Ineffectiveness Gain (Loss) Recognized in Derivatives and Hedging Activities				Net Interest Settlements Classified in Net Interest Income a			Hedge Adjustments Amortized into Net Interest Income b
	Three months ended March 31, 2014
	Hedged item type -
	Available-for-sale securities	$	(2	)		$	1			$	(1	)		$	(35	)	$	—
	Advances	(30		)		32				2				(20		)	(1		)
	MPF Loans held for portfolio	—				—				—				—			(5		)
	Consolidated obligation bonds	133				(140		)		(7		)		61			(5		)
	Total	$	101			$	(107	)		$	(6	)		$	6		$	(11	)
	Three months ended March 31, 2013
	Hedged item type -
	Available-for-sale securities	$	56			$	(55	)		$	1			$	(34	)	$	—
	Advances	26				(23		)		3				(17		)	(1		)
	MPF Loans held for portfolio	—				—				—				—			(10		)
	Consolidated obligation bonds	(87		)		85				(2		)		47			(7		)
	Total	$	(5	)		$	7			$	2			$	(4	)	$	(18	)
	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 a
	Three months ended March 31, 2014
	Advances -	$	3			$	—			$	3			$	—		$	(3	)		$	—
	interest rate floors
	Discount notes -	(1		)		1				—				24			24				(61		)
	interest rate swaps
	Total	$	2			$	1			$	3			$	24		$	21			$	(61	)
	Three months ended March 31, 2013
	Advances -	$	3			$	—			$	3			$	—		$	(3	)		$	—
	interest rate floors
	Discount notes -	(1		)		1				—				88			88				(67		)
	interest rate swaps
	Total	$	2			$	1			$	3			$	88		$	85			$	(67	)
	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.

Consolidated_Obligations_Table

Consolidated Obligations (Tables)	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Consolidated Obligation Bonds [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 March 31, 2014	Contractual Maturity			Weighted Average Interest Rate			Next Maturity or Call Date
	Due in one year or less	$	9,541		2.07	%		$	30,776
	One to two years	2,270			3.03	%		3,170
	Two to three years	4,127			2.36	%		2,137
	Three to four years	4,845			2.31	%		2,100
	Four to five years	5,813			1.34	%		120
	Thereafter	12,951			2.17	%		1,244
	Total par value	$	39,547		2.11	%		$	39,547
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	31-Mar-14			December 31, 2013
	Carrying Amount	$	26,889		$	31,089
	Par Value	26,891			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	31-Mar-14			31-Dec-13
	Noncallable	$	15,792		$	12,927
	Callable	23,755			19,565
	Total par value	39,547			32,492
	Bond premiums (discounts), net	19			20
	Hedging adjustments	(381		)	(526		)
	Fair value option adjustments	(2		)	1
	Total consolidated obligation bonds	$	39,183		$	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:
		March 31, 2014										31-Dec-13
	Par values as of	Bonds			Discount				Total			Bonds			Discount			Total
					Notes										Notes
	FHLB System	$	486,343		$	267,597			$	753,940		$	473,495		$	293,342		$	766,837
	FHLB Chicago as primary obligor	39,547			26,891				66,438			32,492			31,092			63,584
	As a percent of the FHLB System	8		%	10		%		9		%	7		%	11		%	8		%

Capital_and_Mandatorily_Redeem1

Capital and Mandatorily Redeemable Capital Stock (Tables)	3 Months Ended
	Mar. 31, 2014
Capital [Abstract]	'
Schedule of Minimum Capital Requirements [Table Text Block]	'
	For details on our minimum capital requirements, 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:
		March 31, 2014						December 31, 2013
		Requirement			Actual			Requirement			Actual
	Risk-based capital	$	1,291		$	3,817		$	1,465		$	3,703
	Total regulatory capital	$	2,882		$	3,817		$	2,752		$	3,703
	Total regulatory capital ratio	4		%	5.3		%	4		%	5.38		%
	Leverage capital	$	3,602		$	5,725		$	3,440		$	5,555
	Leverage capital ratio	5		%	7.95		%	5		%	8.07		%

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [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 Gain (Loss)			Non-credit OTTI			Net Unrealized Gain (Loss)			Non-credit OTTI			Net Unrealized on Cash Flow Hedges			Post-Retirement Plans		Total AOCI
	For the three months ended March 31, 2013
	Beginning balance	$	1,576		$	(8	)	$	(3	)	$	(381	)	$	(1,078	)	$	1	$	107
	Net change in the period	(85		)	6			1			15			85			1		23
	Ending balance	$	1,491		$	(2	)	$	(2	)	$	(366	)	$	(993	)	$	2	$	130
	For the three months ended March 31, 2014
	Beginning balance	$	1,052		$	—		$	(1	)	$	(320	)	$	(665	)	$	1	$	67
	Change in the period before reclassifications to net income	55			—			—			14			24			—		93
	Period amounts reclassified to:
	Net interest income	—			—			—			—			(2		)	—		(2		)
	Non-interest gain (loss)	—			—			—			—			(1		)	—		(1		)
	Non-interest expense	—			—			—			—			—			1		1
	Net change in the period	55			—			—			14			21			1		91
	Ending balance	$	1,107		$	—		$	(1	)	$	(306	)	$	(644	)	$	2	$	158

Fair_Value_Accounting_Tables

Fair Value Accounting (Tables)	3 Months Ended
	Mar. 31, 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.
	•	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.
										Fair Value Hierarchy
		Carrying Amount				Fair Value				Level 1				Level 2				Level 3
	March 31, 2014
	Financial Assets-
	Cash and due from banks	$	726			$	726			$	726			$	—			$	—
	Interest bearing deposits	560				560				560				—				—
	Federal Funds sold	2,884				2,884				—				2,884				—
	Securities purchased under agreements to resell	6,400				6,400				—				6,400				—
	Held-to-maturity securities	7,129				7,831				—				6,237				1,594
	Advances	22,372				22,489				—				22,489				—
	MPF Loans held in portfolio, net	7,294				7,842				—				7,654				188
	Accrued interest receivable	88				88				—				88				—
	Financial Liabilities-
	Deposits	$	(560	)		$	(560	)		$	—			$	(560	)		$	—
	Consolidated obligation discount notes	(26,889		)		(26,889		)		—				(26,889		)		—
	Consolidated obligation bonds	(39,183		)		(39,835		)		—				(39,769		)		(66		)	a
	Accrued interest payable	(238		)		(238		)		—				(238		)		—
	Mandatorily redeemable capital stock	(5		)		(5		)		(5		)		—				—
	Subordinated notes	(944		)		(1,045		)		—				(1,045		)		—
	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 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. We had no level 1 instruments for either period presented.
	As of March 31, 2014		Level 2				Level 3				Netting Adjustment				Total
	Financial assets -
	Trading securities:
	U.S. Government & other government related		$	3,069			$	—			$	—			$	3,069
	GSE residential MBS		71				—				—				71
	Governmental-guaranteed residential MBS		2				—				—				2
	Trading securities		3,142				—				—				3,142
	Available-for-sale securities:
	U.S. Government & other government related		554				—				—				554
	FFELP ABS		6,712				—				—				6,712
	GSE residential MBS		11,325				—				—				11,325
	Government-guaranteed residential MBS		2,635				—				—				2,635
	Private-label residential MBS		—				73				—				73
	Available-for-sale securities		21,226				73				—				21,299
	Advances		30				—				—				30
	Derivative assets		686			a	16			a	(664		)	b	38
	Total financial assets at fair value		$	25,084			$	89			$	(664	)		$	24,509
	Level 3 as a percent of total assets at fair value						0.4		%
	Financial liabilities -
	Consolidated obligation bonds		$	(3,408	)		$	(66	)	c	$	—			$	(3,474	)
	Derivative liabilities		(1,789		)	a	—				1,732			b	(57		)
	Total financial liabilities at fair value		$	(5,197	)		$	(66	)		$	1,732			$	(3,531	)
	Level 3 as a percent of total liabilities at fair value						1.9		%
	Table continued on next page.
	As of December 31, 2013		Level 2				Level 3				Netting Adjustment				Total
	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			a	19			a	(696		)	b	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		)	c	—				(1,090		)
	Derivative liabilities		(1,959		)	a	—				1,851			b	(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	Our derivative assets are, in part secured with cash collateral (Level 1) as described in Note 9 - Derivatives and Hedging Activities. However, we view our net derivative assets or liabilities as a single unit of account for purposes of classifying the total balance within the fair value hierarchy. Accordingly, we classify our derivative assets and liabilities as either Level 2 or Level 3 within the fair value hierarchy.
	b	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.
	c	Amount represents debt carried at fair value under a fair value hedge strategy, not at fair value under the fair value option.
Level 3 Disclosures for all Assets and Liabilities that are Measured at Fair Value on a Recurring Basis [Table Text Block]	'
	The following table presents a reconciliation of assets and liabilities that are measured at fair value on the statements of condition using significant unobservable inputs (Level 3):
			Available-For-Sale								Derivative Assets Interest-Rate Related								Consolidated Obligation Bonds
			Private-Label MBS
	For the three months ended		2014				2013				2014				2013				2014				2013
	Balance at beginning of period		$	72			$	69			$	19			$	32			$	(69	)		$	(82	)
	Gains (losses) realized and unrealized:
	Change in fair value recorded in earnings - Instruments held under fair value option		—				—				—				—				—				6
	Recorded in earnings in interest income		1				1				—				—				—				—
	Recorded in net unrealized gain/loss on AFS in OCI		2				—				—				—				—				—
	Change in fair value recorded in OCI -		—				6				—				—				—				—
	Non-credit OTTI on AFS securities
	Change in fair value recorded in earnings - Derivatives and hedging activities		—				—				(3		)		(5		)		3				—
	Paydowns and settlements		(2		)		(3		)		—				—				—				—
	Balance at end of period		$	73			$	73			$	16			$	27			$	(66	)		$	(76	)
	Total unrealized gains (losses) recorded in earnings (derivatives and hedging activities) and attributable to instruments still held at period end		$	1			$	—			$	—			$	—			$	3			$	5
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. These assets 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. Held-to-maturity, private-label residential MBS are measured at fair value using the same methodology and significant assumptions utilized for available-for-sale private-label residential MBS. 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.
			March 31, 2014				December 31, 2013
			Level  3				Level  3
	Impaired MPF Loans		$	188			$	200
	Real estate owned		10				10
	Total non-recurring assets		$	198			$	210
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:
		March 31, 2014												March 31, 2013
						Consolidated Obligation												Consolidated Obligation
		Advances				Bonds				Discount Notes				Advances				Bonds				Discount Notes
	For the three months ended
	Balance beginning of period	$	30			$	(1,021	)		$	(75	)		$	9			$	(1,251	)		$	—
	New transactions elected for fair value option	—				(2,660		)		—				—				(250		)		(75		)
	Maturities and extinguishments (if any)	—				270				75				—				250				—
	Net gain (loss) on instruments held at fair value	—				4				—				—				1				—
	Change in accrued interest and other	—				(1		)		—				—				—				—
	Balance end of period	$	30			$	(3,408	)		$	—			$	9			$	(1,250	)		$	(75	)
Fair Value Option, Quantitative Disclosure, Difference Between Aggregate Fair Value and Aggregate Remaining Contractual Principal Balance Outstanding [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.
			March 31, 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		$	30			$	30			$	—			$	29			$	30			$	1
	Consolidated obligation discount notes		—				—				—				75				75				—
	Consolidated obligation bonds		3,410				3,408				(2		)		1,020				1,021				1

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 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.
			March 31, 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		$	1,010		$	—		$	1,010	$	220		$	—		$	220
	Unsettled consolidated obligation discount notes		—			—			—		1,000			—			1,000
	Member standby letters of credit		1,045			616		b	1,661		1,407			696		b	2,103
	Housing authority standby bond purchase agreements		237			116			353		149			258			407
	MPF Program mortgage purchase commitments		109			—			109		103			—			103
	Unresolved repurchasable loans and indemnifications to Fannie Mae for MPF Xtra loans		74		a	—			74		56		a	—			56
	Committed unused member lines of credit		4,000			—			4,000		—			—			—
	Advance commitments		157			57			214		125			101			226
	Commitments		$	6,632		$	789		$	7,421	$	3,060		$	1,055		$	4,115
	a	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.
	b	Contains $399 million and $495 million of letters of credit which are renewable annually.

Transactions_with_Members_and_1

Transactions with Members and Other FHLBs (Tables)	3 Months Ended
	Mar. 31, 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.
		March 31, 2014		December 31, 2013
	Assets - Advances	$	179	$	2,546
	Liabilities - Deposits	24		27
	Equity - Capital Stock	17		188

Interest_Income_and_Interest_E2

Interest Income and Interest Expense (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Interest income -	'	'
Federal Funds sold, securities purchased under agreements to resell, and interest bearing deposits	$1	$4
Investment securities -	'	'
Trading	7	6
Available-for-sale	143	149
Held-to-maturity	77	90
Total investment securities	227	245
Advances -	'	'
Advances interest income	38	36
Advance prepayment fees	1	5
Total Advances	39	41
MPF Loans held in portfolio, net	88	113
Total interest income	355	403
Consolidated obligations -	'	'
Discount notes	67	77
Bonds	147	199
Total consolidated obligations	214	276
Subordinated notes	14	14
Total interest expense	228	290
Net interest income before provision for credit losses	127	113
Provision for (reversal of) credit losses	-3	0
Net interest income	$130	$113

Investment_Securities_Pledged_

Investment Securities Pledged securities (Details) (USD $)	Mar. 31, 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	$46	$32

Investment_Securities_Trading_

Investment Securities (Trading Securities) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Trading Securities [Line Items]	'	'
Trading securities	$3,142	$1,899
U.S. Government & other government related	'	'
Trading Securities [Line Items]	'	'
Trading securities	3,069	1,823
GSE residential	'	'
Trading Securities [Line Items]	'	'
Trading securities	71	74
Government-guaranteed residential	'	'
Trading Securities [Line Items]	'	'
Trading securities	2	2
Total MBS	'	'
Trading Securities [Line Items]	'	'
Trading securities	$73	$76

Investment_Securities_Net_year

Investment Securities Net year-to-date unrealized gains (losses) trading securities (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Trading Securities, Change in Unrealized Holding Gain (Loss)	($5)	($6)

Investment_Securities_Availabl

Investment Securities (Available-for-sale Securities) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost Basis	$20,192	$20,484
Gross Unrealized Gains in AOCI	1,127	1,094
Gross Unrealized Losses in AOCI	-20	-42
Available-for-sale Securities, Total	21,299	21,536
U.S. Government & other government related	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost Basis	524	560
Gross Unrealized Gains in AOCI	30	29
Gross Unrealized Losses in AOCI	0	-1
Available-for-sale Securities, Total	554	588
FFELP ABS	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost Basis	6,272	6,395
Gross Unrealized Gains in AOCI	446	425
Gross Unrealized Losses in AOCI	-6	-17
Available-for-sale Securities, Total	6,712	6,803
GSE residential	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost Basis	10,807	10,888
Gross Unrealized Gains in AOCI	532	518
Gross Unrealized Losses in AOCI	-14	-24
Available-for-sale Securities, Total	11,325	11,382
Government-guaranteed residential	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost Basis	2,521	2,572
Gross Unrealized Gains in AOCI	114	119
Gross Unrealized Losses in AOCI	0	0
Available-for-sale Securities, Total	2,635	2,691
Private-label residential	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost Basis	68	69
Gross Unrealized Gains in AOCI	5	3
Gross Unrealized Losses in AOCI	0	0
Available-for-sale Securities, Total	73	72
Total MBS	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost Basis	13,396	13,529
Gross Unrealized Gains in AOCI	651	640
Gross Unrealized Losses in AOCI	-14	-24
Available-for-sale Securities, Total	$14,033	$14,145

Investment_Securities_HeldtoMa

Investment Securities (Held-to-Maturities Securities) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	$7,435	$8,237
Non-credit OTTI Recognized in AOCI (Loss)	-306	-320
Held-to-maturity Securities, Total	7,129	7,917
Gross Unrecognized Holding Gains	705	704
Gross Unrecognized Holding Losses	-3	-3
Held-to-maturity Securities, Fair Value	7,831	8,618
U.S. Government & other government related	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	1,650	2,259
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Held-to-maturity Securities, Total	1,650	2,259
Gross Unrecognized Holding Gains	55	42
Gross Unrecognized Holding Losses	-1	-1
Held-to-maturity Securities, Fair Value	1,704	2,300
State or local housing agency	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	21	22
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Held-to-maturity Securities, Total	21	22
Gross Unrecognized Holding Gains	0	0
Gross Unrecognized Holding Losses	0	0
Held-to-maturity Securities, Fair Value	21	22
GSE residential	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	3,064	3,193
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Held-to-maturity Securities, Total	3,064	3,193
Gross Unrecognized Holding Gains	192	186
Gross Unrecognized Holding Losses	0	0
Held-to-maturity Securities, Fair Value	3,256	3,379
Government-guaranteed residential	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	1,226	1,248
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Held-to-maturity Securities, Total	1,226	1,248
Gross Unrecognized Holding Gains	30	32
Gross Unrecognized Holding Losses	0	0
Held-to-maturity Securities, Fair Value	1,256	1,280
Private-label residential	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	1,474	1,515
Non-credit OTTI Recognized in AOCI (Loss)	-306	-320
Held-to-maturity Securities, Total	1,168	1,195
Gross Unrecognized Holding Gains	428	444
Gross Unrecognized Holding Losses	-2	-2
Held-to-maturity Securities, Fair Value	1,594	1,637
Total MBS	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Amortized Cost Basis	5,764	5,956
Non-credit OTTI Recognized in AOCI (Loss)	-306	-320
Held-to-maturity Securities, Total	5,458	5,636
Gross Unrecognized Holding Gains	650	662
Gross Unrecognized Holding Losses	-2	-2
Held-to-maturity Securities, Fair Value	$6,106	$6,296

Investment_Securities_Unrealiz

Investment Securities (Unrealized Temporary Losses on Available-for-sale Securities) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Less than 12 Months	'	'
Fair Value	$34	$62
Gross Unrealized Losses	0	-1
12 Months or More	'	'
Fair Value	3,792	4,271
Gross Unrealized Losses	-20	-41
Total	'	'
Fair Value	3,826	4,333
Gross Unrealized Losses	-20	-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	4	22
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	963	969
Gross Unrealized Losses	-6	-17
Total	'	'
Fair Value	967	991
Gross Unrealized Losses	-6	-17
GSE residential	'	'
Less than 12 Months	'	'
Fair Value	0	0
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	2,828	3,293
Gross Unrealized Losses	-14	-24
Total	'	'
Fair Value	2,828	3,293
Gross Unrealized Losses	-14	-24
Government-guaranteed residential	'	'
Less than 12 Months	'	'
Fair Value	30	'
Gross Unrealized Losses	0	'
12 Months or More	'	'
Fair Value	0	'
Gross Unrealized Losses	0	'
Total	'	'
Fair Value	30	'
Gross Unrealized Losses	0	'
Private-label residential	'	'
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
Total MBS	'	'
Less than 12 Months	'	'
Fair Value	30	0
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	2,829	3,302
Gross Unrealized Losses	-14	-24
Total	'	'
Fair Value	2,859	3,302
Gross Unrealized Losses	($14)	($24)

Investment_Securities_Unrealiz1

Investment Securities (Unrealized Temporary Losses on Held-to-maturity Securities) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Less than 12 Months	'	'
Fair Value	$70	$105
Gross Unrealized Losses	-1	-1
12 Months or More	'	'
Fair Value	1,495	1,532
Gross Unrealized Losses	-308	-322
Total	'	'
Fair Value	1,565	1,637
Gross Unrealized Losses	-309	-323
U.S. Government & other government related	'	'
Less than 12 Months	'	'
Fair Value	19	85
Gross Unrealized Losses	-1	-1
12 Months or More	'	'
Fair Value	2	0
Gross Unrealized Losses	0	0
Total	'	'
Fair Value	21	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
GSE residential	'	'
Less than 12 Months	'	'
Fair Value	41	10
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	0	0
Gross Unrealized Losses	0	0
Total	'	'
Fair Value	41	10
Gross Unrealized Losses	0	0
Private-label residential	'	'
Less than 12 Months	'	'
Fair Value	0	0
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	1,493	1,532
Gross Unrealized Losses	-308	-322
Total	'	'
Fair Value	1,493	1,532
Gross Unrealized Losses	-308	-322
Total MBS	'	'
Less than 12 Months	'	'
Fair Value	41	10
Gross Unrealized Losses	0	0
12 Months or More	'	'
Fair Value	1,493	1,532
Gross Unrealized Losses	-308	-322
Total	'	'
Fair Value	1,534	1,542
Gross Unrealized Losses	($308)	($322)

Investment_Securities_Maturity

Investment Securities (Maturity Terms) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Available-For-Sale, Due in One Year or Less, Amortized Cost	$0	'
Available-For-Sale, Due after One Year Through Five Years, Amortized Cost	119	'
Available-For-Sale, Due after Five Years Through Ten Years, Amortized Cost	3	'
Available-For-Sale, Due after Ten Years, Amortized Cost	402	'
Available-For-Sale, ABS and MBS without a single maturity date, Amortized Cost	19,668	'
Available-for-sale Debt Securities, Amortized Cost Basis	20,192	20,484
Available-For-Sale, Due in One Year or Less, Fair Value	0	'
Available-For-Sale, Due after One Year Through Five Years, Fair Value	126	'
Available-For-Sale, Due after Five Years Through Ten Years, Fair Value	3	'
Available-For-Sale, Due after Ten Years, Fair Value	425	'
Available-For-Sale, ABS and MBS without a single maturity date, Fair Value	20,745	'
Available-for-sale Securities, Total	21,299	21,536
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	113	'
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	57	'
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	423	'
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	1,078	'
Held-to-maturity Securities, Debt Maturities, ABS and MBS without Single Maturity Date, Net Carrying Amount	5,458	'
Held-to-maturity Securities, Total	7,129	7,917
Held-To-Maturity, Due in One Year or Less, Fair Value	113	'
Held-To-Maturity, Due after One Year Through Five Years, Fair Value	57	'
Held-To-Maturity, Due after Five Years Through Ten Years, Fair Value	439	'
Held-To-Maturity, Due after Ten Years, Fair Value	1,116	'
Held-to-maturity Securities, Debt Maturities, ABS and MBS without Single Maturity Date, Fair Value	6,106	'
Held-to-maturity Securities, Fair Value	$7,831	$8,618

Investment_Securities_Securiti

Investment Securities (Securities Other-than-Temporarily Impaired) (Details) (Private-label residential, USD $)	Mar. 31, 2014
In Millions, unless otherwise specified
Available-for-sale securities | Alt-A	'
Investment Securities [Line Items]	'
Unpaid Principal Balance	$102
Amortized Cost Basis	67
Non-Credit OTTI	0
Gross Unrealized Gains	5
Carrying Amount	72
Fair Value	72
Held-to-maturity Securities [Member]	'
Investment Securities [Line Items]	'
Unpaid Principal Balance	1,820
Amortized Cost Basis	1,318
Non-Credit OTTI	-306
Gross Unrealized Gains	0
Carrying Amount	1,012
Fair Value	1,438
Held-to-maturity Securities [Member] | Prime	'
Investment Securities [Line Items]	'
Unpaid Principal Balance	1,124
Amortized Cost Basis	883
Non-Credit OTTI	-222
Gross Unrealized Gains	0
Carrying Amount	661
Fair Value	934
Held-to-maturity Securities [Member] | Subprime	'
Investment Securities [Line Items]	'
Unpaid Principal Balance	696
Amortized Cost Basis	435
Non-Credit OTTI	-84
Gross Unrealized Gains	0
Carrying Amount	351
Fair Value	$504

Advances_Advances_by_callable_

Advances Advances by callable putable feature (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Advances by callable putable feature [Abstract]	'	'
Noncallable/nonputable	$19,573	$20,259
Callable	990	1,440
Putable	1,714	1,726
Total par value	22,277	23,425
Hedging adjustments	70	39
Other adjustments	25	25
Total advances	$22,372	$23,489

Advances_Advances_by_redemptio

Advances Advances by redemption terms (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'		'
Federal Home Loan Bank Advances, Maturities, Within One Year of Balance Sheet Date	$4,094		'
Federal Home Loan Bank Advances, Maturities, Due After One To Two Years of Balance Sheet Date	1,983		'
Federal Home Loan Bank Advances, Maturities, Due After Two To Three Years of Balance Sheet Date	1,788		'
Federal Home Loan Bank Advances, Maturities, Due After Three To Four Years of Balance Sheet Date	4,146		'
Federal Home Loan Bank Advances, Maturities, Due After Four To Five Years of Balance Sheet Date	8,861		'
Federal Home Loan Bank Advances, Maturities, After Five Years of Balance Sheet Date	1,405		'
Total par value	22,277		23,425
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing Within One Year of Balance Sheet Date	0.67%		'
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing From One To Two Years of Balance Sheet Date	1.46%		'
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing From Two To Three Years of Balance Sheet Date	3.05%		'
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing From Three To Four Years of Balance Sheet Date	1.11%		'
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing From Four To Five Years of Balance Sheet Date	0.27%	[1]	'
Federal Home Loan Bank Advances, Weighted Average Interest Rate of Amounts Maturing After Five Years of Balance Sheet Date	3.45%		'
Federal Home Loan Bank Advances, Weighted Average Interest Rate As Of Balance Sheet Date	1.03%		'
Next Maturity or Call Date	'		'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'		'
Federal Home Loan Bank Advances, Maturities, Within One Year of Balance Sheet Date	5,084		'
Federal Home Loan Bank Advances, Maturities, Due After One To Two Years of Balance Sheet Date	1,883		'
Federal Home Loan Bank Advances, Maturities, Due After Two To Three Years of Balance Sheet Date	1,588		'
Federal Home Loan Bank Advances, Maturities, Due After Three To Four Years of Balance Sheet Date	3,761		'
Federal Home Loan Bank Advances, Maturities, Due After Four To Five Years of Balance Sheet Date	8,561		'
Federal Home Loan Bank Advances, Maturities, After Five Years of Balance Sheet Date	1,400		'
Next Maturity or Put Date	'		'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'		'
Federal Home Loan Bank Advances, Maturities, Within One Year of Balance Sheet Date	5,807		'
Federal Home Loan Bank Advances, Maturities, Due After One To Two Years of Balance Sheet Date	1,550		'
Federal Home Loan Bank Advances, Maturities, Due After Two To Three Years of Balance Sheet Date	1,288		'
Federal Home Loan Bank Advances, Maturities, Due After Three To Four Years of Balance Sheet Date	3,477		'
Federal Home Loan Bank Advances, Maturities, Due After Four To Five Years of Balance Sheet Date	8,775		'
Federal Home Loan Bank Advances, Maturities, After Five Years of Balance Sheet Date	$1,380		'
[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 $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Mortgage Loans on Real Estate [Line Items]	'	'	'	'
Total unpaid principal balance	$7,231	$7,631	'	'
Net premiums, credit enhancement and deferred loan fees	26	27	'	'
Hedging adjustments	61	66	'	'
Total before allowance for credit losses	7,318	7,724	'	'
Allowance for credit losses on MPF Loans	-24	-29	-40	-42
Total MPF Loans held in portfolio, net	7,294	7,695	'	'
Medium term (15 years or less) [Member]	'	'	'	'
Mortgage Loans on Real Estate [Line Items]	'	'	'	'
Total unpaid principal balance	1,517	1,672	'	'
Long term (greater than 15 years) [Member]	'	'	'	'
Mortgage Loans on Real Estate [Line Items]	'	'	'	'
Total unpaid principal balance	5,714	5,959	'	'
Conventional Mortgage Loan [Member]	'	'	'	'
Mortgage Loans on Real Estate [Line Items]	'	'	'	'
Total unpaid principal balance	5,632	5,969	'	'
Government Insured Mortgage Loans [Member]	'	'	'	'
Mortgage Loans on Real Estate [Line Items]	'	'	'	'
Total unpaid principal balance	$1,599	$1,662	'	'

Allowance_for_Credit_Losses_MP

Allowance for Credit Losses MPF Risk Sharing Structure (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 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	$24		$29		$40	$42
Conventional Mortgage Loan [Member]	'		'		'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'		'		'	'
Total Severity Rate	33.00%		35.00%		'	'
Credit Loss Severity Rate	18.00%		19.00%		'	'
Total estimated losses outstanding	72		65		'	'
Less: losses expected to be absorbed by MPF Risk Sharing Structure	-30	[1]	-18	[1]	'	'
Our share of total losses	42		47		'	'
Less: non-credit losses	-19		-21		'	'
Credit losses	23		26		'	'
Plus: other estimated credit losses in the remaining portfolio	1		3		'	'
Allowance for credit losses on conventional MPF Loans	$24		$29		'	'
[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
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'
Balance, beginning of period	$29	$42
Losses charged to the allowance	-2	-2
Provision for (reversal of) credit losses	-3	0
Balance, end of period	$24	$40

Allowance_for_Credit_Losses_Lo

Allowance for Credit Losses Loans evaluated for impairment (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Allowance for credit losses on conventional MPF Loans	$24	$29	$40	$42
Total recorded investment	7,355	7,763	'	'
Conventional Mortgage Loan [Member]	'	'	'	'
Specifically identified and individually evaluated for impairment	19	22	'	'
Homogeneous pools of loans and collectively evaluated for impairment	5	7	'	'
Allowance for credit losses on conventional MPF Loans	24	29	'	'
Individually evaluated for impairment - with an allowance	200	215	'	'
Collectively evaluated for impairment	5,531	5,861	'	'
Total recorded investment	$5,731	$6,076	'	'

Allowance_for_Credit_Losses_Cr

Allowance for Credit Losses Credit Quality Indicators - MPF Loans (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Recorded Investment, Past Due [Line Items]	'		'
Past due 30-59 days	$226		$269
Past due 60-89 days	71		81
Past due 90 days or more	329		353
Total past due	626		703
Total current	6,729		7,060
Total recorded investment	7,355		7,763
In process of foreclosure	158		159
Serious delinquency rate	4.52%	[1]	3.82%	[1]
Past due 90 days or more still accruing interest	168	[2]	178	[2]
On nonaccrual status	204		221
Conventional Mortgage Loan [Member]	'		'
Recorded Investment, Past Due [Line Items]	'		'
Past due 30-59 days	142		165
Past due 60-89 days	47		50
Past due 90 days or more	188		202
Total past due	377		417
Total current	5,354		5,659
Total recorded investment	5,731		6,076
In process of foreclosure	102		108
Serious delinquency rate	3.33%	[1]	2.81%	[1]
Past due 90 days or more still accruing interest	26	[2]	27	[2]
On nonaccrual status	204		221
Government Insured Mortgage Loans [Member]	'		'
Recorded Investment, Past Due [Line Items]	'		'
Past due 30-59 days	84		104
Past due 60-89 days	24		31
Past due 90 days or more	141		151
Total past due	249		286
Total current	1,375		1,401
Total recorded investment	1,624		1,687
In process of foreclosure	56		51
Serious delinquency rate	8.74%	[1]	7.44%	[1]
Past due 90 days or more still accruing interest	142	[2]	151	[2]
On nonaccrual status	$0		$0
[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]	Consists of MPF Loans that are either government mortgage loans 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.

Allowance_for_Credit_Losses_Tr

Allowance for Credit Losses Troubled debt restructurings outstanding balances (Details) (Conventional Mortgage Loan [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'
Recorded investment in conventional MPF Loan TDRs	$58	$59
Performing	'	'
Financing Receivable, Modifications [Line Items]	'	'
Recorded investment in conventional MPF Loan TDRs	36	16
Nonperforming	'	'
Financing Receivable, Modifications [Line Items]	'	'
Recorded investment in conventional MPF Loan TDRs	$22	$43

Allowance_for_Credit_Losses_Tr1

Allowance for Credit Losses Troubled debt restructurings activity (Details) (Conventional Mortgage Loan [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Conventional Mortgage Loan [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
TDRs made during the periods	$6	$7
TDRs from the previous 12 months that subsequently defaulted during the periods	$15	$8

Allowance_for_Credit_Losses_Im

Allowance for Credit Losses Impaired MPF Loans at period ends (Details) (Conventional Mortgage Loan [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Conventional Mortgage Loan [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	$200	$215
Unpaid Principal Balance	197	210
Related Allowance	$19	$22

Allowance_for_Credit_Losses_Im1

Allowance for Credit Losses Impaired MPF Loans during the periods (Details) (Conventional Mortgage Loan [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Conventional Mortgage Loan [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Average Recorded Investment	$204	$224

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activities (Narrative) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'
Maximum amount of additional collateral at fair value to our derivatives counterparties if our credit rating had been lowered to the next lower rating	$52	'
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	46	32
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty	$2	'

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activities Derivatives in statements of condition (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]	'		'
Notional Amount	$53,126		$48,377
Derivative Instruments in Hedges, Assets, at Fair Value	63		85
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	639		646
Derivative Asset, Fair Value, Gross Asset	702		731
Derivative Asset, Fair Value, Amount Not Offset Against Cash and Securities Collateral	48	[1]	54	[1]
Derivative assets	38		35
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,502		1,670
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	287		289
Derivative Liability, Fair Value, Gross Liability	1,789		1,959
Derivative Liabilities, Fair Value, Amount Not Offset Against Cash and Securities Collateral	1,135		1,282
Derivative liabilities	57		108
Accrued interest receivable	88		93
Derivatives in hedge accounting relationships-	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount	30,441		28,346
Derivatives not in hedge accounting relationships-	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount	22,685		20,031
Interest rate swaps	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Instruments in Hedges, Assets, at Fair Value	63		85
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	453		440
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,502		1,670
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	285		286
Interest rate swaps | Derivatives in hedge accounting relationships-	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount	30,441		28,346
Interest rate swaps | Derivatives not in hedge accounting relationships-	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount	17,948		14,199
Interest rate swaptions	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	52		60
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0		0
Interest rate swaptions | Derivatives not in hedge accounting relationships-	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount	3,355		4,465
Interest rate caps/floors	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	132		143
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0		0
Interest rate caps/floors | Derivatives not in hedge accounting relationships-	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount	1,164		1,164
Interest rate future forwards	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0		0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	0		0
Interest rate future forwards | Derivatives not in hedge accounting relationships-	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount	4		0
Mortgage delivery commitments	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	2		3
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	2		3
Mortgage delivery commitments | Derivatives not in hedge accounting relationships-	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount	214		203
Derivative Financial Instruments, Assets	'		'
Derivatives, Fair Value [Line Items]	'		'
Accrued interest receivable	13		6
Netting adjustments excluding cash collateral	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Asset, Fair Value, Amount Offset Against Collateral	-654		-677
Derivative Liability, Fair Value, Amount Offset Against Collateral	-654		-677
Cash collateral and related accrued interest on the collateral	'		'
Derivatives, Fair Value [Line Items]	'		'
Derivative Asset, Fair Value, Amount Offset Against Collateral	-10		-19
Derivative Liability, Fair Value, Amount Offset Against Collateral	($1,078)		($1,174)
[1]	Includes derivative net accrued interest receivable of $13 million as of MarchB 31, 2014, and $6 million as of DecemberB 31, 2013.

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activities Derivative instruments with legal right of offset (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Offsetting Assets [Line Items]	'		'
Derivative Asset With Legal Right of Offset, Fair Value, Gross Asset	$700	[1]	$728	[1]
Derivative Asset, Collateral, Obligation to Return Cash, Offset	-664		-696
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	36		32
Derivative assets	38		35
Net unsecured derivative asset	8	[2]	4	[2]
Derivative Liability With Legal Right of Offset, Fair Value, Gross Liability	1,787		1,956
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	-1,732		-1,851
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	55		105
Derivative liabilities	57		108
Net unsecured derivative liability	57	[2]	108	[2]
Derivative Liability, Fair Value of Collateral	6		0
Accrued interest receivable	88		93
Bilateral derivatives	'		'
Offsetting Assets [Line Items]	'		'
Derivative Asset With Legal Right of Offset, Fair Value, Gross Asset	685		707
Derivative Asset, Collateral, Obligation to Return Cash, Offset	-652		-676
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	33		31
Derivative Asset, Not Subject to Master Netting Agreement	2		3
Derivative assets	35		34
Obligation to Return Securities Received as Collateral	30		31
Net unsecured derivative asset	5		3
Derivative Liability With Legal Right of Offset, Fair Value, Gross Liability	1,689		1,949
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	-1,634		-1,845
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	55		104
Derivative Laibility, Not Subject to Master Netting Agreement	2		3
Derivative liabilities	57		107
Financial Instruments Owned and Pledged as Collateral, Amount Not Eligible to be Repledged by Counterparty	0		0
Net unsecured derivative liability	57		107
Cleared derivatives	'		'
Offsetting Assets [Line Items]	'		'
Derivative Asset With Legal Right of Offset, Fair Value, Gross Asset	15		21
Derivative Asset, Collateral, Obligation to Return Cash, Offset	-12		-20
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	3		1
Derivative assets	3		1
Net unsecured derivative asset	3		1
Derivative Liability With Legal Right of Offset, Fair Value, Gross Liability	98		7
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	-98		-6
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0		1
Derivative liabilities	0		1
Net unsecured derivative liability	0		1
Derivative Financial Instruments, Assets	'		'
Offsetting Assets [Line Items]	'		'
Accrued interest receivable	$13		$6
[1]	Includes derivative net accrued interest receivable of $13 million as of MarchB 31, 2014, and $6 million as of DecemberB 31, 2013.
[2]	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
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Fair value hedges - ineffectiveness net gain (loss)	($6)	$2
Cash flow hedges - ineffectiveness net gain (loss)	1	1
Economic hedges - net gain (loss)	-9	-1
Net gains (losses) on derivatives and hedging activities	-14	2
Interest rate swaps	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Fair value hedges - ineffectiveness net gain (loss)	-6	2
Economic hedges - net gain (loss)	1	11
Interest rate swaptions	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Economic hedges - net gain (loss)	-15	-6
Interest rate caps/floors	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Economic hedges - net gain (loss)	-10	-19
Net interest settlements	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Economic hedges - net gain (loss)	$15	$13

Derivatives_and_Hedging_Activi6

Derivatives and Hedging Activities (Fair Value Hedges) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Total Ineffectiveness Gain (Loss) Recognized in Derivatives and Hedging Activities	($6)		$2
Fair Value Hedges [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Gain (Loss) on Derivative	101		-5
Gain (Loss) on Hedged Item	-107		7
Total Ineffectiveness Gain (Loss) Recognized in Derivatives and Hedging Activities	-6		2
Net Interest Settlements Effect on Net Interest Income	6	[1]	-4	[1]
Hedge Adjustments Amortized into Net Interest Income	-11	[2]	-18	[2]
Available-for-sale securities | Fair Value Hedges [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Gain (Loss) on Derivative	-2		56
Gain (Loss) on Hedged Item	1		-55
Total Ineffectiveness Gain (Loss) Recognized in Derivatives and Hedging Activities	-1		1
Net Interest Settlements Effect on Net Interest Income	-35	[1]	-34	[1]
Hedge Adjustments Amortized into Net Interest Income	0	[2]	0	[2]
Advances | Fair Value Hedges [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Gain (Loss) on Derivative	-30		26
Gain (Loss) on Hedged Item	32		-23
Total Ineffectiveness Gain (Loss) Recognized in Derivatives and Hedging Activities	2		3
Net Interest Settlements Effect on Net Interest Income	-20	[1]	-17	[1]
Hedge Adjustments Amortized into Net Interest Income	-1	[2]	-1	[2]
MPF Loans held for portfolio | Fair Value Hedges [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Gain (Loss) on Derivative	0		0
Gain (Loss) on Hedged Item	0		0
Total Ineffectiveness Gain (Loss) Recognized in Derivatives and Hedging Activities	0		0
Net Interest Settlements Effect on Net Interest Income	0	[1]	0	[1]
Hedge Adjustments Amortized into Net Interest Income	-5	[2]	-10	[2]
Total consolidated obligation bonds | Fair Value Hedges [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Gain (Loss) on Derivative	133		-87
Gain (Loss) on Hedged Item	-140		85
Total Ineffectiveness Gain (Loss) Recognized in Derivatives and Hedging Activities	-7		-2
Net Interest Settlements Effect on Net Interest Income	61	[1]	47	[1]
Hedge Adjustments Amortized into Net Interest Income	($5)	[2]	($7)	[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
In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Net Interest Settlements Classified in Net Interest Income	($228)		($290)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	8		'
Maximum Hedging Period For Forecasted Cash Flows For Transactions, Excluding Payment of Variable Interest on Existing Financial Instruments	'6 years		'
Cash Flow Hedging [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amortization of Effective Portion Reclassified From AOCI to Interest	2		2
Ineffective Portion Reclassified to Derivatives and Hedging Activities	1		1
Total Reclassified Into Statements of Income	3		3
Effective Portion Recorded in AOCI	24		88
Net Change in OCI	21		85
Net Interest Settlements Classified in Net Interest Income	-61	[1]	-67	[1]
Advances | Cash Flow Hedging [Member] | Interest Rate Floor [Member]	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amortization of Effective Portion Reclassified From AOCI to Interest	3		3
Ineffective Portion Reclassified to Derivatives and Hedging Activities	0		0
Total Reclassified Into Statements of Income	3		3
Effective Portion Recorded in AOCI	0		0
Net Change in OCI	-3		-3
Net Interest Settlements Classified in Net Interest Income	0	[1]	0	[1]
Discount Notes | Cash Flow Hedging [Member] | Interest rate swaps	'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'
Amortization of Effective Portion Reclassified From AOCI to Interest	-1		-1
Ineffective Portion Reclassified to Derivatives and Hedging Activities	1		1
Total Reclassified Into Statements of Income	0		0
Effective Portion Recorded in AOCI	24		88
Net Change in OCI	24		88
Net Interest Settlements Classified in Net Interest Income	($61)	[1]	($67)	[1]
[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_Conso

Consolidated Obligations Consolidated obligation bonds by maturity date (Details) (Total consolidated obligation bonds, USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Extinguishment of Debt [Line Items]	'	'
Due in one year or less	$9,541	'
One to two years	2,270	'
Two to three years	4,127	'
Three to four years	4,845	'
Four to five years	5,813	'
Thereafter	12,951	'
Total par value	39,547	32,492
Due in one year or less, weighted average interest rate	2.07%	'
One to two years, weighted average interest rate	3.03%	'
Two to three years, weighted average interest rate	2.36%	'
Three to four years, weighted average interest rate	2.31%	'
Four to five years, weighted average interest rate	1.34%	'
Thereafter, weighted average interest rate	2.17%	'
Total par value, weighted average interest rate	2.11%	'
Earlier of Contractual Maturity or Next Call Date [Member]	'	'
Extinguishment of Debt [Line Items]	'	'
Due in one year or less	30,776	'
One to two years	3,170	'
Two to three years	2,137	'
Three to four years	2,100	'
Four to five years	120	'
Thereafter	1,244	'
Total par value	$39,547	'

Consolidated_Obligations_Conso1

Consolidated Obligations Consolidated obligation short term discount notes (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Short-term Debt [Line Items]	'	'
Carrying Amount	$26,889	$31,089
Weighted Average Interest Rate	0.06%	0.07%
Discount Notes	'	'
Short-term Debt [Line Items]	'	'
Par Value	$26,891	$31,092

Consolidated_Obligations_Conso2

Consolidated Obligations Consolidated obligation bonds by callable feature (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'	'
Total consolidated obligation bonds	$39,183	$31,987
Total consolidated obligation bonds	'	'
Debt Instrument [Line Items]	'	'
Total par value	39,547	32,492
Bond premiums (discounts), net	19	20
Hedging adjustments	-381	-526
Fair value option adjustments	-2	1
Total consolidated obligation bonds	39,183	31,987
Noncallable | Total consolidated obligation bonds	'	'
Debt Instrument [Line Items]	'	'
Total par value	15,792	12,927
Callable | Total consolidated obligation bonds	'	'
Debt Instrument [Line Items]	'	'
Total par value	$23,755	$19,565

Consolidated_Obligations_Conso3

Consolidated Obligations Consolidated obligations system wide (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
FHLB System	'	'
Related Party Transaction [Line Items]	'	'
Par Value	$753,940	$766,837
FHLB Chicago as primary obligor	'	'
Related Party Transaction [Line Items]	'	'
Par Value	66,438	63,584
As a percent of the FHLB System	9.00%	8.00%
Bonds | FHLB System	'	'
Related Party Transaction [Line Items]	'	'
Par Value	486,343	473,495
Bonds | FHLB Chicago as primary obligor	'	'
Related Party Transaction [Line Items]	'	'
Par Value	39,547	32,492
As a percent of the FHLB System	8.00%	7.00%
Discount Notes	'	'
Related Party Transaction [Line Items]	'	'
Par Value	26,891	31,092
Discount Notes | FHLB System	'	'
Related Party Transaction [Line Items]	'	'
Par Value	267,597	293,342
Discount Notes | FHLB Chicago as primary obligor	'	'
Related Party Transaction [Line Items]	'	'
Par Value	$26,891	$31,092
As a percent of the FHLB System	10.00%	11.00%

Capital_and_Mandatorily_Redeem2

Capital and Mandatorily Redeemable Capital Stock Narrative (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Member Capital Stock [Line Items]	'	'
Capital stock par value	$100	$100
Capital Stock, redemption, period of written notice	'5 years	'
Minimum threshold B2 activity capital stock $ requirement	$5	'
Maximum threshold B2 activity capital stock $ requirement	250	'
Minimum advance activity capital stock % requirement	2.00%	'
Maximum advance activity capital stock % requirement	6.00%	'
Actual advance activity capital stock % requirement	'	2.00%
Standard membership capital stock requirement $ cap amount	165.3	'
Minimum membership capital stock requirement $ cap amount	25	'
Maximum membership capital stock requirement $ cap amount	$250	'
Maximum membership capital stock requirement as a % of total	9.90%	'

Capital_and_Mandatorily_Redeem3

Capital and Mandatorily Redeemable Capital Stock Regulatory capital requirements and actual (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Equity [Abstract]	'	'
Risk Based Capital Requirement	$1,291	$1,465
Risk Based Capital Actual	3,817	3,703
Regulatory Capital, Requirement	2,882	2,752
Regulatory Capital, Actual	3,817	3,703
Regulatory Capital Ratio, Requirement	4.00%	4.00%
Regulatory Capital Ratio, Actual	5.30%	5.38%
Leverage Capital, Requirement	3,602	3,440
Leverage Capital, Actual	$5,725	$5,555
Leverage Capital Ratio, Requirement	5.00%	5.00%
Leverage Capital Ratio, Actual	7.95%	8.07%

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	$67	'
Period amounts reclassified to:	'	'
Net change in the period	91	23
Ending balance	158	'
Total AOCI	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	67	107
Change in the period before reclassifications to net income	93	'
Period amounts reclassified to:	'	'
Net interest income	-2	'
Non-interest gain (loss)	-1	'
Non-interest expense	1	'
Net change in the period	91	23
Ending balance	158	130
Net Unrealized on Cash Flow Hedges	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	-665	-1,078
Change in the period before reclassifications to net income	24	'
Period amounts reclassified to:	'	'
Net interest income	-2	'
Non-interest gain (loss)	-1	'
Non-interest expense	0	'
Net change in the period	21	85
Ending balance	-644	-993
Post-Retirement Plans	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	1	1
Change in the period before reclassifications to net income	0	'
Period amounts reclassified to:	'	'
Net interest income	0	'
Non-interest gain (loss)	0	'
Non-interest expense	1	'
Net change in the period	1	1
Ending balance	2	2
Available-for-sale | Net Unrealized Gain (Loss)	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	1,052	1,576
Change in the period before reclassifications to net income	55	'
Period amounts reclassified to:	'	'
Net interest income	0	'
Non-interest gain (loss)	0	'
Non-interest expense	0	'
Net change in the period	55	-85
Ending balance	1,107	1,491
Available-for-sale | Non-credit OTTI	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	0	-8
Change in the period before reclassifications to net income	0	'
Period amounts reclassified to:	'	'
Net interest income	0	'
Non-interest gain (loss)	0	'
Non-interest expense	0	'
Net change in the period	0	6
Ending balance	0	-2
Held-to-maturity | Net Unrealized Gain (Loss)	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	-1	-3
Change in the period before reclassifications to net income	0	'
Period amounts reclassified to:	'	'
Net interest income	0	'
Non-interest gain (loss)	0	'
Non-interest expense	0	'
Net change in the period	0	1
Ending balance	-1	-2
Held-to-maturity | Non-credit OTTI	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'
Beginning balance	-320	-381
Change in the period before reclassifications to net income	14	'
Period amounts reclassified to:	'	'
Net interest income	0	'
Non-interest gain (loss)	0	'
Non-interest expense	0	'
Net change in the period	14	15
Ending balance	($306)	($366)

Fair_Value_Accounting_Carrying

Fair Value Accounting (Carrying Value and Fair Value of Financial Instruments) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Financial Assets-	'		'
Held-to-maturity securities	$7,831		$8,618
Financial Liabilities-	'		'
Consolidated obligation discount notes	0		-75
Consolidated obligation bonds	-3,408		-1,021
Level 1	'		'
Financial Assets-	'		'
Cash and due from banks	726		971
Interest bearing deposits	560		'
Federal Funds sold	0		0
Securities purchased under agreements to resell	0		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	2,884		500
Securities purchased under agreements to resell	6,400		4,550
Held-to-maturity securities	6,237		6,981
Advances	22,489		23,586
MPF Loans held in portfolio, net	7,654		8,069
Accrued interest receivable	88		93
Financial Liabilities-	'		'
Deposits	-560		-544
Consolidated obligation discount notes	-26,889		-31,089
Consolidated obligation bonds	-39,769		-32,576
Accrued interest payable	-238		-137
Mandatorily redeemable capital stock	0		0
Subordinated notes	-1,045		-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		0
Held-to-maturity securities	1,594		1,637
Advances	0		0
MPF Loans held in portfolio, net	188		200
Accrued interest receivable	0		0
Financial Liabilities-	'		'
Deposits	0		0
Consolidated obligation discount notes	0		0
Consolidated obligation bonds	-66	[1]	-69	[1]
Accrued interest payable	0		0
Mandatorily redeemable capital stock	0		0
Subordinated notes	0		0
Carrying Amount	'		'
Financial Assets-	'		'
Cash and due from banks	726		971
Interest bearing deposits	560		'
Federal Funds sold	2,884		500
Securities purchased under agreements to resell	6,400		4,550
Held-to-maturity securities	7,129		7,917
Advances	22,372		23,489
MPF Loans held in portfolio, net	7,294		7,695
Accrued interest receivable	88		93
Financial Liabilities-	'		'
Deposits	-560		-544
Consolidated obligation discount notes	-26,889		-31,089
Consolidated obligation bonds	-39,183		-31,987
Accrued interest payable	-238		-137
Mandatorily redeemable capital stock	-5		-5
Subordinated notes	-944		-944
Fair Value	'		'
Financial Assets-	'		'
Cash and due from banks	726		971
Interest bearing deposits	560		'
Federal Funds sold	2,884		500
Securities purchased under agreements to resell	6,400		4,550
Held-to-maturity securities	7,831		8,618
Advances	22,489		23,586
MPF Loans held in portfolio, net	7,842		8,269
Accrued interest receivable	88		93
Financial Liabilities-	'		'
Deposits	-560		-544
Consolidated obligation discount notes	-26,889		-31,089
Consolidated obligation bonds	-39,835		-32,645
Accrued interest payable	-238		-137
Mandatorily redeemable capital stock	-5		-5
Subordinated notes	($1,045)		($1,055)
[1]	Amount represents debt carried at fair value under a 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 $)	Mar. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Financial Assets-	'		'
Trading securities	$3,142		$1,899
Available-for-sale securities	21,299		21,536
Derivative assets	38		35
Financial Liabilities-	'		'
Consolidated obligation discount notes	0		-75
Consolidated obligation bonds	-3,408		-1,021
Derivative liabilities	-57		-108
Level 2	'		'
Financial Assets-	'		'
Advances	22,489		23,586
Financial Liabilities-	'		'
Consolidated obligation discount notes	-26,889		-31,089
Consolidated obligation bonds	-39,769		-32,576
Level 3	'		'
Financial Assets-	'		'
Advances	0		0
Financial Liabilities-	'		'
Consolidated obligation discount notes	0		0
Consolidated obligation bonds	-66	[1]	-69	[1]
Fair Value, Measurements, Recurring [Member] | Level 2	'		'
Financial Assets-	'		'
Trading securities	3,142		1,899
Available-for-sale securities	21,226		21,464
Advances	30		30
Derivative assets	686	[2]	712	[2]
Total financial assets at fair value	25,084		24,105
Financial Liabilities-	'		'
Consolidated obligation discount notes	'		-75
Consolidated obligation bonds	-3,408		-1,021
Derivative liabilities	-1,789	[2]	-1,959	[2]
Total financial liabilities at fair value	-5,197		-3,055
Fair Value, Measurements, Recurring [Member] | Level 3	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale securities	73		72
Advances	0		0
Derivative assets	16	[2]	19	[2]
Total financial assets at fair value	89		91
Level 3 as a percent of total assets at fair value	0.40%		0.40%
Financial Liabilities-	'		'
Consolidated obligation discount notes	'		0
Consolidated obligation bonds	-66	[1]	-69	[1]
Derivative liabilities	0		0
Total financial liabilities at fair value	-66		-69
Level 3 as a percent of total liabilities at fair value	1.90%		5.40%
Fair Value, Measurements, Recurring [Member] | Netting Adjustment	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale securities	0		0
Advances	0		0
Derivative assets	-664	[3]	-696	[3]
Total financial assets at fair value	-664		-696
Financial Liabilities-	'		'
Consolidated obligation discount notes	'		0
Consolidated obligation bonds	0		0
Derivative liabilities	1,732	[3]	1,851	[3]
Total financial liabilities at fair value	1,732		1,851
Fair Value, Measurements, Recurring [Member] | Fair Value	'		'
Financial Assets-	'		'
Trading securities	3,142		1,899
Available-for-sale securities	21,299		21,536
Advances	30		30
Derivative assets	38		35
Total financial assets at fair value	24,509		23,500
Financial Liabilities-	'		'
Consolidated obligation discount notes	'		-75
Consolidated obligation bonds	-3,474		-1,090
Derivative liabilities	-57		-108
Total financial liabilities at fair value	-3,531		-1,273
U.S. Government & other government related | Fair Value, Measurements, Recurring [Member] | Level 2	'		'
Financial Assets-	'		'
Trading securities	3,069		1,823
Available-for-sale securities	554		588
U.S. Government & other government related | Fair Value, Measurements, Recurring [Member] | Level 3	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale securities	0		0
U.S. Government & other government related | Fair Value, Measurements, Recurring [Member] | Netting Adjustment	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale securities	0		0
U.S. Government & other government related | Fair Value, Measurements, Recurring [Member] | Fair Value	'		'
Financial Assets-	'		'
Trading securities	3,069		1,823
Available-for-sale securities	554		588
FFELP ABS | Fair Value, Measurements, Recurring [Member] | Level 2	'		'
Financial Assets-	'		'
Available-for-sale securities	6,712		6,803
FFELP ABS | Fair Value, Measurements, Recurring [Member] | Level 3	'		'
Financial Assets-	'		'
Available-for-sale securities	0		0
FFELP ABS | Fair Value, Measurements, Recurring [Member] | Netting Adjustment	'		'
Financial Assets-	'		'
Available-for-sale securities	0		0
FFELP ABS | Fair Value, Measurements, Recurring [Member] | Fair Value	'		'
Financial Assets-	'		'
Available-for-sale securities	6,712		6,803
GSE residential | Fair Value, Measurements, Recurring [Member] | Level 2	'		'
Financial Assets-	'		'
Trading securities	71		74
Available-for-sale securities	11,325		11,382
GSE residential | Fair Value, Measurements, Recurring [Member] | Level 3	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale securities	0		0
GSE residential | Fair Value, Measurements, Recurring [Member] | Netting Adjustment	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale securities	0		0
GSE residential | Fair Value, Measurements, Recurring [Member] | Fair Value	'		'
Financial Assets-	'		'
Trading securities	71		74
Available-for-sale securities	11,325		11,382
Government-guaranteed residential | Fair Value, Measurements, Recurring [Member] | Level 2	'		'
Financial Assets-	'		'
Trading securities	2		2
Available-for-sale securities	2,635		2,691
Government-guaranteed residential | Fair Value, Measurements, Recurring [Member] | Level 3	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale securities	0		0
Government-guaranteed residential | Fair Value, Measurements, Recurring [Member] | Netting Adjustment	'		'
Financial Assets-	'		'
Trading securities	0		0
Available-for-sale securities	0		0
Government-guaranteed residential | Fair Value, Measurements, Recurring [Member] | Fair Value	'		'
Financial Assets-	'		'
Trading securities	2		2
Available-for-sale securities	2,635		2,691
Private-label residential | Fair Value, Measurements, Recurring [Member] | Level 2	'		'
Financial Assets-	'		'
Available-for-sale securities	0		0
Private-label residential | Fair Value, Measurements, Recurring [Member] | Level 3	'		'
Financial Assets-	'		'
Available-for-sale securities	73		72
Private-label residential | Fair Value, Measurements, Recurring [Member] | Netting Adjustment	'		'
Financial Assets-	'		'
Available-for-sale securities	0		0
Private-label residential | Fair Value, Measurements, Recurring [Member] | Fair Value	'		'
Financial Assets-	'		'
Available-for-sale securities	$73		$72
[1]	Amount represents debt carried at fair value under a fair value hedge strategy, not at fair value under the fair value option.
[2]	Our derivative assets are, in part secured with cash collateral (Level 1) as described in Note 9 - Derivatives and Hedging Activities. However, we view our net derivative assets or liabilities as a single unit of account for purposes of classifying the total balance within the fair value hierarchy. Accordingly, we classify our derivative assets and liabilities as either Level 2 or Level 3 within the fair value hierarchy.
[3]	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.

Fair_Value_Accounting_Level_3_

Fair Value Accounting (Level 3 Reconciliation) (Details) (Fair Value, Measurements, Recurring [Member], Level 3, USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Private-label residential	'	'
Level 3 Assets [Roll Forward]	'	'
Balance at beginning of period	$72	$69
Gains (losses) realized and unrealized:	'	'
Change in fair value recorded in earnings - Instruments held under fair value option	0	0
Recorded in earnings in interest income	1	1
Recorded in net unrealized gain/loss on AFS in OCI	2	0
Change in fair value recorded in OCI - Non-credit OTTI on AFS securities	0	6
Change in fair value recorded in earnings - Derivatives and hedging activities	0	0
Paydowns and settlements	-2	-3
Balance at end of period	73	73
Gains (losses) realized and unrealized:	'	'
Total unrealized gains (losses) recorded in earnings (derivatives and hedging activities) and attributable to instruments still held at period end	1	0
Derivative Assets Interest-Rate Related	'	'
Level 3 Assets [Roll Forward]	'	'
Balance at beginning of period	19	32
Gains (losses) realized and unrealized:	'	'
Change in fair value recorded in earnings - Instruments held under fair value option	0	0
Recorded in earnings in interest income	0	0
Recorded in net unrealized gain/loss on AFS in OCI	0	0
Change in fair value recorded in OCI - Non-credit OTTI on AFS securities	0	0
Change in fair value recorded in earnings - Derivatives and hedging activities	-3	-5
Paydowns and settlements	0	0
Balance at end of period	16	27
Gains (losses) realized and unrealized:	'	'
Total unrealized gains (losses) recorded in earnings (derivatives and hedging activities) and attributable to instruments still held at period end	0	0
Total consolidated obligation bonds	'	'
Level 3 Liabilities [Roll Forward]	'	'
Balance at beginning of period	-69	-82
Gains (losses) realized and unrealized:	'	'
Change in fair value recorded in earnings - Instruments held under fair value option	0	6
Recorded in earnings in interest income	0	0
Recorded in net unrealized gain/loss on AFS in OCI	0	0
Change in fair value recorded in OCI - Non-credit OTTI on AFS securities	0	0
Change in fair value recorded in earnings - Derivatives and hedging activities	3	0
Paydowns and settlements	0	0
Balance at end of period	-66	-76
Total unrealized gains (losses) recorded in earnings (derivatives and hedging activities) and attributable to instruments still held at period end	$3	$5

Fair_Value_Accounting_Fair_Val1

Fair Value Accounting (Fair Value Measured on a Nonrecurring Basis) (Details) (Fair Value, Measurements, Nonrecurring [Member], Level 3, USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Measurements, Nonrecurring [Member] | Level 3	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired MPF Loans	$188	$200
Real estate owned	10	10
Total non-recurring assets	$198	$210

Fair_Value_Accounting_Fair_Val2

Fair Value Accounting (Fair Value Option) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Option, Quantitative Disclosures [Roll Forward]	'	'
Net gain (loss) on instruments held at fair value	$4	$1
Advances	'	'
Fair Value, Option, Quantitative Disclosures [Roll Forward]	'	'
Balance beginning of period	30	9
New transactions elected for fair value option	0	0
Maturities and extinguishments (if any)	0	0
Net gain (loss) on instruments held at fair value	0	0
Change in accrued interest and other	0	0
Balance end of period	30	9
Total consolidated obligation bonds	'	'
Fair Value, Option, Quantitative Disclosures [Roll Forward]	'	'
Balance beginning of period	-1,021	-1,251
New transactions elected for fair value option	-2,660	-250
Maturities and extinguishments (if any)	270	250
Net gain (loss) on instruments held at fair value	4	1
Change in accrued interest and other	-1	0
Balance end of period	-3,408	-1,250
Consolidated obligation discount notes	'	'
Fair Value, Option, Quantitative Disclosures [Roll Forward]	'	'
Balance beginning of period	-75	0
New transactions elected for fair value option	0	-75
Maturities and extinguishments (if any)	75	0
Net gain (loss) on instruments held at fair value	0	0
Change in accrued interest and other	0	0
Balance end of period	$0	($75)

Fair_Value_Accounting_Fair_Val3

Fair Value Accounting (Fair Value Option Difference Between Fair Value and Unpaid Principal Balance) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Fair Value, Advances	$30	$30
Fair Value, Consolidated Obligation Discount Notes	0	75
Fair Value, Consolidated Obligation Bonds	3,408	1,021
Advances	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Unpaid Principal Balance	30	29
Fair Value, Advances	30	30
Fair Value Over (Under) UPB	0	1
Consolidated obligation discount notes	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Unpaid Principal Balance	0	75
Fair Value, Consolidated Obligation Discount Notes	0	75
Fair Value Over (Under) UPB	0	0
Total consolidated obligation bonds	'	'
Fair Value, Option, Quantitative Disclosures [Line Items]	'	'
Unpaid Principal Balance	3,410	1,020
Fair Value, Consolidated Obligation Bonds	3,408	1,021
Fair Value Over (Under) UPB	($2)	$1

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Commitments	'		'
Expire within one year	$6,632		$3,060
Expire after one year	789		1,055
Total	7,421		4,115
Unsettled consolidated obligation bonds	'		'
Commitments	'		'
Expire within one year	1,010		220
Expire after one year	0		0
Total	1,010		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	1,045		1,407
Expire after one year	616	[1]	696	[1]
Total	1,661		2,103
Letters of credit issued, renewable annually	399		495
Housing authority standby bond purchase agreements	'		'
Commitments	'		'
Expire within one year	237		149
Expire after one year	116		258
Total	353		407
MPF Program mortgage purchase commitments	'		'
Commitments	'		'
Expire within one year	109		103
Expire after one year	0		0
Total	109		103
Unresolved repurchasable loans and indemnifications to Fannie Mae for MPF Xtra loans	'		'
Commitments	'		'
Expire within one year	74	[2]	56	[2]
Expire after one year	0		0
Total	74		56
Committed unused member lines of credit	'		'
Commitments	'		'
Expire within one year	4,000		0
Expire after one year	0		0
Total	4,000		0
Advance commitments	'		'
Commitments	'		'
Expire within one year	157		125
Expire after one year	57		101
Total	$214		$226
[1]	Contains $399 million and $495 million of letters of credit which are 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.

Transactions_with_Members_and_2

Transactions with Members and Other FHLBs (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Related Party Transaction [Line Items]	'	'
Assets - Advances	$22,372	$23,489
Liabilities - Deposits	560	544
Equity - Capital Stock	1,705	1,670
Related Party Members [Member]	'	'
Related Party Transaction [Line Items]	'	'
Assets - Advances	179	2,546
Liabilities - Deposits	24	27
Equity - Capital Stock	$17	$188