Federal Home Loan Bank of Chicago 10-Q6 Nov 182018 Q3 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2018shares
Document and Entity Information [Abstract]
Entity Registrant Name	Federal Home Loan Bank of Chicago
Entity Central Index Key	1,331,451
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding	20,301,777
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes

Statements of Condition

Statements of Condition - USD ($) shares in Millions, $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 44	$ 42
Interest bearing deposits	775	775
Federal Funds sold	7,685	7,561
Securities purchased under agreements to resell	2,150	5,000
Investment debt securities -
Trading	2,596	233
pledged	177	67
Available-for-sale	13,707	12,957
Held-to-maturity,	2,928	4,157
fair value	3,217	4,538
Investment debt securities	19,231	17,347
Advances	54,667	48,085
carried at fair value	908	776
MPF Loans held in portfolio, net of	6,439	5,193
allowance for credit losses	(1)	(2)
Derivative assets	11	3
Other assets,	408	349
carried at fair value	116	118
Assets	91,410	84,355
Deposits -
Noninterest bearing	50	51
Interest bearing,	531	473
from other FHLBs	14	32
Deposits	581	524
Consolidated obligations, net -
Discount notes,	37,674	41,191
carried at fair value	0	749
Bonds	46,232	37,121
carried at fair value	2,202	5,260
Consolidated obligations, net	83,906	78,312
Derivative liabilities	25	20
Affordable Housing Program assessment payable	88	88
Mandatorily redeemable capital stock	313	311
Other liabilities	1,173	248
Liabilities	86,086	79,503
Commitments and contingencies - see notes to the financial statements
Capital
Class B1 activity stock,	$ 1,543	$ 1,241
million shares issued and outstanding	15	12
Class B2 membership stock,	$ 175	$ 202
million shares issued and outstanding	2	2
Capital stock - putable,	$ 1,718	$ 1,443
par value per share	$ 100	$ 100
Retained earnings - unrestricted	$ 2,989	$ 2,845
Retained earnings - restricted	499	452
Retained earnings	3,488	3,297
Accumulated other comprehensive income (loss) (AOCI)	118	112
Capital	5,324	4,852
Liabilities and capital	$ 91,410	$ 84,355

Statements of Income

Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Statements of Income - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Interest income	$ 603	$ 411	$ 1,660	$ 1,121
Interest expense	477	288	1,278	768
Net interest income	126	123	382	353
Provision for (reversal of) credit losses	(1)	(1)	(1)	0
Net interest income after provision for (reversal of) credit losses	127	124	383	353
Noninterest income -
Derivatives and hedging activities	(5)	0	(5)	6
Instruments held under fair value option	(3)	(5)	(20)	(3)
MPF fees,	9	8	24	21
from other FHLBs	6	5	18	15
Other, net	5	2	16	7
Noninterest income	6	5	15	31
Noninterest expense -
Compensation and benefits	26	26	78	77
Operating expenses	20	15	52	45
Other	1	2	5	7
Noninterest expense	47	43	135	129
Income before assessments	86	86	263	255
Affordable Housing Program	9	9	27	26
Net income	$ 77	$ 77	$ 236	$ 229

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Statements of Comprehensive Income - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 77	$ 77	$ 236	$ 229
Other comprehensive income (loss) -
Net unrealized gain (loss) available-for-sale debt securities	(32)	(24)	(124)	(5)
Noncredit OTTI held-to-maturity debt securities	7	8	22	25
Net unrealized gain (loss) cash flow hedges	25	42	115	111
Postretirement plans	(4)	3	(7)	1
Other comprehensive income (loss)	(4)	29	6	132
Comprehensive income	$ 73	$ 106	$ 242	$ 361

Statements of Stockholders' Equ

Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Capital Stock - Putable - B1 Activity	Capital Stock - Putable - B2 Membership	Total Capital Stock	Retained Earnings, Unrestricted	Retained Earnings, Restricted	Retained Earnings, Total	AOCI
Shares, beginning at Dec. 31, 2016		12	6	18
Balance, beginning at Dec. 31, 2016	$ 4,695	$ 1,160	$ 551	$ 1,711	$ 2,631	$ 389	$ 3,020	$ (36)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	361				183	46	229	132
Proceeds from issuance of capital stock shares		21	0	21
Proceeds from issuance of capital stock	2,172	$ 2,162	$ 10	$ 2,172
Repurchases of capital stock shares		0	(23)	(23)
Repurchases of capital stock	(2,320)	$ (35)	$ (2,285)	$ (2,320)
Capital stock reclassified to mandatorily redeemable capital stock liability shares		0	0	0
Capital stock reclassed to mandatorily redeemable capital stock liability	(6)	$ (3)	$ (3)	$ (6)
Transfers between classes of capital stock shares		(19)	19
Transfers between classes of capital stock		$ (1,933)	$ 1,933
Cash dividends - class B1	(28)				(28)		(28)
Cash dividends - class B2	(2)				(2)		(2)
Common Stock Dividend - Annualized Rate		3.15%	1.05%
Total change in period shares		2	(4)	(2)
Total change in period	177	$ 191	$ (345)	$ (154)	153	46	199	132
Shares, ending at Sep. 30, 2017		14	2	16
Balance, ending at Sep. 30, 2017	4,872	$ 1,351	$ 206	$ 1,557	2,784	435	3,219	96
Shares, beginning at Dec. 31, 2017		12	2	14
Balance, beginning at Dec. 31, 2017	4,852	$ 1,241	$ 202	$ 1,443	2,845	452	3,297	112
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	242				189	47	236	6
Proceeds from issuance of capital stock shares		23	0	23
Proceeds from issuance of capital stock	2,265	$ 2,254	$ 11	$ 2,265
Repurchases of capital stock shares		0	(20)	(20)
Repurchases of capital stock	(1,988)	$ 0	$ (1,988)	$ (1,988)
Capital stock reclassified to mandatorily redeemable capital stock liability shares		0	0	0
Capital stock reclassed to mandatorily redeemable capital stock liability	(2)	$ (1)	$ (1)	$ (2)
Transfers between classes of capital stock shares		(20)	20
Transfers between classes of capital stock		$ (1,951)	$ 1,951
Cash dividends - class B1	(43)				(43)		(43)
Cash dividends - class B2	(2)				(2)		(2)
Common Stock Dividend - Annualized Rate		3.92%	1.60%
Total change in period shares		3	0	3
Total change in period	472	$ 302	$ (27)	$ 275	144	47	191	6
Shares, ending at Sep. 30, 2018		15	2	17
Balance, ending at Sep. 30, 2018	$ 5,324	$ 1,543	$ 175	$ 1,718	$ 2,989	$ 499	$ 3,488	$ 118

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows - USD ($) $ in Millions		9 Months Ended
Condensed Statements of Cash Flows - USD ($) $ in Millions		Sep. 30, 2018	Sep. 30, 2017
Operating
Net cash provided by (used in) operating activities		$ 447	$ 337
Investing
Net change interest bearing deposits		0	(100)
Net change Federal Funds sold		(124)	(5,774)
Net change securities purchased under agreements to resell		2,850	(1,450)
Trading debt securities -
Sales		200	801
Proceeds from maturities and paydowns		8	205
Purchases		(2,566)	(200)
Available-for-sale debt securities -
Proceeds from maturities and paydowns		2,365	1,307
Purchases		(2,476)	(5)
Held-to-maturity debt securities -
Short-term held-to-maturity securities, net	[1]	497	570
Proceeds from maturities and paydowns		786	816
Purchases		(22)	(27)
Advances -
Principal collected		1,017,269	543,511
Issued		(1,024,012)	(548,590)
MPF Loans held in portfolio -
Principal collected		595	761
Purchases		(1,848)	(821)
Other investing activities		14	20
Net cash provided by (used in) investing activities		(6,464)	(8,976)
Financing
Net change deposits		57	104
Discount notes -
Net proceeds from issuance		1,469,628	1,080,879
Payments for maturing and retiring		(1,473,155)	(1,071,386)
Consolidated obligation bonds -
Net proceeds from issuance		32,132	13,947
Payments for maturing and retiring		(22,862)	(15,024)
Capital stock -
Proceeds from issuance		2,265	2,172
Repurchases		(1,988)	(2,320)
Cash dividends paid		(45)	(30)
Other financing activities		(13)	(22)
Net cash provided by (used in) financing activities		6,019	8,320
Net increase (decrease) in cash and due from banks		2	(319)
Cash and due from banks at beginning of period		42	351
Cash and due from banks at end of period		$ 44	$ 32

[1]	Short-term assets and liabilities are presented on a net basis provided that the original maturity of the asset or liability is three months or less from the date of origination or the date of purchase.

Background and Basis of Present

Background and Basis of Presentation	9 Months Ended
Background and Basis of Presentation	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Background and Basis of Presentation The Federal Home Loan Bank of Chicago is a federally chartered corporation and one of 11 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. We are supervised and regulated by the Federal Housing Finance Agency (FHFA), an independent federal agency in the executive branch of the United States (U.S.) government. Each FHLB is a member-owned cooperative with members from a specifically defined geographic district. Our defined geographic district is Illinois and Wisconsin. All federally-insured depository institutions, insurance companies engaged in residential housing finance, credit unions and community development financial institutions located in our district are eligible to apply for membership with us. All our members are required to purchase our capital stock as a condition of membership. Our capital stock is not publicly traded, and is issued, repurchased or redeemed at par value, $100 per share, subject to certain statutory and regulatory limits. As a cooperative, we do business with our members, and former members (under limited circumstances). Specifically, we provide credit 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. 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, 2017 , included in our Annual Report on Form 10-K ( 2017 Form 10-K) starting on page F-1, as filed with the Securities and Exchange Commission (SEC). Unless otherwise specified, references to we, us, our, and the Bank are to the Federal Home Loan Bank of Chicago. “Mortgage Partnership Finance”, “MPF”, “MPF Xtra”, and "Community First" are registered trademarks of the Federal Home Loan Bank of Chicago. See the Glossary of Terms starting on page 59 for the definitions of certain terms used herein. Use of Estimates and Assumptions We are required to make estimates and assumptions when preparing our financial statements in accordance with GAAP. The most significant of these estimates and assumptions applies to fair value measurements and allowance for credit losses. Our actual results may differ from the results reported in our financial statements due to such estimates and assumptions. This includes the reported amounts of assets and liabilities, the reported amounts of income and expense, and the disclosure of contingent assets and liabilities. Basis of Presentation The basis of presentation pertaining to the consolidation of our variable interest entities has not changed since we filed our 2017 Form 10-K. The basis of presentation pertaining to our gross versus net presentation of financial instruments also has not changed since we filed our 2017 Form 10-K. Refer to Note 1- Background and Basis of Presentation

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2018
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Summary of Significant Accounting Policies Our Summary of Significant Accounting Policies through December 31, 2017 , can be found in Note 2 – Summary of Significant Accounting Policies to the financial statements in our 2017 Form 10-K. We adopted the following policies effective January 1, 2018 : Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01) We are required to recognize the portion of instrument-specific credit risk attributable to the total change in fair value of our consolidated obligations that are carried at fair value in our statements of comprehensive income. We measure such instrument-specific credit risk based on our nonperformance risk, which includes our nonperformance risk and the credit risk associated with the joint and several liability of other FHLBs. The new guidance did not have an effect on our financial condition, results of operations, and cash flows at the time of adoption. Revenue from Contracts with Customers (ASU 2014-09) The revenue recognition guidance did not have any effect on our financial condition, results of operations, or cash flows at the time of adoption. This is because the majority of our financial instruments and other contractual rights that generate revenue are covered by other GAAP, and therefore, were scoped out of this new guidance. Further, our prior method of recognizing service fee revenue was consistent with this new guidance. As a result, no cumulative effect adjustment to our opening balance of retained earnings in 2018 was required under the modified retrospective method. Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07) We are required to classify the service cost component of our net periodic pension and postretirement benefit costs as compensation costs. All other components of our net periodic pension and postretirement benefit costs are required to be classified as Noninterest expense - Other. Previously, our total net periodic pension and postretirement costs were classified as compensation costs. We made this classification change on a prospective rather than retrospective basis due to materiality. This classification guidance did not have a significant effect on our financial condition, results of operations, and cash flows. Classification of Certain Cash Receipts and Cash Payments in the Statement of Cash Flows (ASU 2016-15)

Recently Issued but Not Yet Ado

Recently Issued but Not Yet Adopted Accounting Standards	9 Months Ended
Recently Issued but Not Yet Adopted Accounting Standards	Sep. 30, 2018
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 Targeted Improvements to Accounting for Hedging Activities (ASU 2017-12) In August of 2017, the FASB issued targeted improvements to existing derivatives and hedging guidance. We will adopt this guidance as of January 1, 2019, and we may modify the risk of certain fair value hedges from contractual coupon interest rate to benchmark rate component improving hedge effectiveness. We do not expect the opening adjustment to retained earnings related to ineffectiveness recognized in prior reporting periods attributable to open cash flows hedges to be material as of January 1, 2019. We are still assessing the impact of other potential impacts of implementing ASU 2017-12 at this time. Outlined below are the significant changes to existing GAAP guidance that may have an effect on us. Newly Permitted Hedging Strategies: • Permits us to enter into a cash flow hedge of the variability in cash flows in a financial instrument that has a contractually specified interest rate. • Permits us to hedge the benchmark risk component of cash flows in a fair value hedge. • Permits us to enter into a partial-term fair value hedge of the hedged item. • Permits us to enter into last-of-layer fair value hedges. Assessment of Hedge Effectiveness: • Permits qualitative assessment of hedge effectiveness. • Enables applying the long-haul method of assessing hedge effectiveness in cases where the shortcut method was initially applied but subsequently is not or no longer is appropriate. Financial Statement Presentation: • Requires the entire change in fair value of the hedging instrument in a cash flow hedge to be recorded and deferred in AOCI until reclassification to our statements of income would be required. • Requires hedge ineffectiveness to be presented in either interest income or interest expense, whichever is appropriate rather than in derivatives and hedging activities in our statements of income. • The presentation and disclosure guidance will be prospectively adopted. Transition: • Prior reporting periods are not restated. • Requires recognition of cumulative effect adjustment to AOCI with a corresponding adjustment to the opening balance of retained earnings related to ineffectiveness recognized in prior reporting periods attributable to open cash flow hedges as of January 1, 2019. • Permits us to modify the risk hedged under the existing fair value hedges of interest rate risk with the risk under newly permitted hedging strategies as of January 1, 2019. Such an election will require an adjustment to the opening balance of retained earnings. • We are permitted to reclassify a debt security from held-to-maturity to available-for-sale if the debt security is eligible to be hedged under the last-of-the layer method. Measurement of Credit Losses on Financial Instruments (ASU 2016-13) In June of 2016, the FASB amended existing GAAP guidance applicable to measuring credit losses on financial instruments. This guidance takes effect January 1, 2020. We are in the process of reviewing the expected effect of this guidance on our financial condition, results of operations, and cash flows. Specifically, the amendment replaces the “incurred loss” impairment methodology applied under current GAAP with a “currently expected credit losses” or CECL methodology. The measurement of CECL is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the financial instrument’s reported amount. Upon adoption, any difference between our existing and CECL allowance for credit losses will be recognized as a cumulative-effect adjustment to the opening balance of our retained earnings as of January 1, 2020. In addition, the accounting for securities is amended as follows: • Aligns the income statement recognition of credit losses for securities with the reporting period in which changes in collectability occur by recording credit losses (and subsequent reversals) through an allowance rather than a write-down as currently required under GAAP. • Requires recognition of a credit loss on available-for-sale (AFS) securities into the income statement if the present value of cash flows expected to be collected on the security is less than its amortized cost basis. Additionally, the allowance on AFS debt securities will be limited to the amount by which fair value is less than the amortized cost basis. A prospective transition approach is required for debt securities. Accordingly, any OTTI write-downs on securities recognized prior to January 1, 2020 may not be reversed at the time of our adoption. Improvements in expected cash flows for these securities will continue to be accounted for as yield adjustments over their remaining life. Additionally, recoveries for these securities will be recorded in earnings only when received. Leases (ASU 2016-02) In February of 2016, the FASB issued lease accounting guidance that becomes effective January 1, 2019. Upon adoption we are required to apply the guidance to the beginning of our earliest statement of income presented, that is, January 1, 2017, using the modified retrospective approach. Prior statements of income will not need to be restated. The cumulative effect adjustment to the opening balance of retained earnings, if applicable, will be recognized as of January 1, 2019. The guidance requires us to recognize and measure our operating leases as right-of-use assets, with terms that exceed 12 months, in our statements of condition. Expenses attributable to our leases will continue to be included in noninterest expense - operating expenses in our statements of income. We do not expect the new guidance to have a significant effect on our financial condition, results of operations, and cash flows since our existing off-balance sheet operating leases are not material. Fair value Measurement Disclosures (ASU 2018-13) In August of 2018, the FASB issued an amendment to existing fair value measurement disclosure requirements. The amendment removes, modifies or adds to existing fair value measurement disclosure requirements. The amendments are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments related to additional Level 3 disclosures should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted to remove or modify disclosures under this amendment and new disclosures required under this amendment may be deferred to the December 15, 2019 effective date. Compensation-Retirement Benefits-Defined Benefit Plans Disclosures (ASU 2018-14) In August of 2018, the FASB issued an amendment to existing defined benefit plan disclosure requirements. The amendment removes certain requirements and adds a requirement to explain the reasons for significant gains and losses related to changes in the benefit obligation for the period. The amendments are effective January 1, 2021. Early adoption is permitted. We are required to apply the amendments on a retrospective basis to all periods presented. Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement (ASU 2018-15)

Interest Income and Interest Ex

Interest Income and Interest Expense	9 Months Ended
Interest Income and Interest Expense	Sep. 30, 2018
Interest Income (Expense), Net [Abstract]
Interest Income and Interest Expense Disclosure [Text Block]	Interest Income and Interest Expense The following table presents interest income and interest expense for the periods indicated: Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Interest income - Trading $ 8 $ 1 $ 23 $ 3 Available-for-sale interest income 107 106 318 321 Available-for-sale prepayment fees 7 9 27 20 Available-for-sale 114 115 345 341 Held-to-maturity 46 47 135 148 Investment debt securities 168 163 503 492 Advances 312 157 811 386 MPF Loans held in portfolio 62 53 177 160 Federal funds sold and securities purchased under agreements to resell 54 34 152 74 Other 7 4 17 9 Interest income 603 411 1,660 1,121 Interest expense - Consolidated obligations - Discount notes 208 148 596 363 Bonds 263 136 665 394 Other 6 4 17 11 Interest expense 477 288 1,278 768 Net interest income 126 123 $ 382 $ 353 Provision for (reversal of) credit losses (1 ) (1 ) (1 ) — Net interest income after provision for (reversal of) credit losses $ 127 $ 124 $ 383 $ 353

Investment Debt Securities

Investment Debt Securities	9 Months Ended
Investment Debt Securities	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Investment Debt Securities We classify debt securities as either trading, held-to-maturity (HTM), or available-for-sale (AFS). Our security disclosures within these classifications are disaggregated by major security types as shown below. Our major security types are based on the nature and risks of the security: • U.S. Government & other government related - may consist of the sovereign debt of the United States; debt issued by government sponsored enterprises (GSE); debt issued by the Tennessee Valley Authority; and securities guaranteed by the Small Business Administration. • Federal Family Education Loan Program - asset-backed securities (FFELP ABS). • GSE residential mortgage-backed securities (MBS) - issued by Fannie Mae and Freddie Mac. • Government guaranteed residential MBS. • Private label residential MBS. • State or local housing agency obligations. Pledged Collateral We disclose the amount of investment securities pledged as collateral pertaining to our derivatives activity on our statements of condition. See Note 9 - Derivatives and Hedging Activities for further details. Trading Debt Securities The following table presents the fair value of our trading debt securities. Our unrealized gains (losses) on trading debt securities still held on our statement of condition as of the end of the reporting period were $8 million at September 30, 2018 and were not material at December 31, 2017. As of September 30, 2018 December 31, 2017 U.S. Government & other government related $ 2,574 $ 202 Residential MBS GSE 21 30 Government guaranteed 1 1 Trading debt securities $ 2,596 $ 233 Amortized Cost Basis and Fair Value – Available-for-Sale Debt Securities (AFS) Amortized Cost Basis Gross Unrealized Gains in AOCI Gross Unrealized (Losses) in AOCI Carrying Amount and Fair Value As of September 30, 2018 U.S. Government & other government related $ 440 $ 8 $ (1 ) $ 447 State or local housing agency 16 — — 16 FFELP ABS 3,680 220 — 3,900 Residential MBS GSE 8,520 38 (4 ) 8,554 Government guaranteed 732 14 — 746 Private label 36 8 — 44 Available-for-sale debt securities $ 13,424 $ 288 $ (5 ) $ 13,707 As of December 31, 2017 U.S. Government & other government related $ 256 $ 15 $ — $ 271 State or local housing agency 21 — — 21 FFELP ABS 3,987 234 (7 ) 4,214 Residential MBS GSE 7,275 132 (1 ) 7,406 Government guaranteed 971 24 — 995 Private label 40 10 — 50 Available-for-sale debt securities $ 12,550 $ 415 $ (8 ) $ 12,957 We had no sales of AFS securities for the periods presented. Amortized Cost Basis, Carrying Amount, and Fair Value - Held-to-Maturity Debt Securities (HTM) Amortized Cost Basis Non-credit OTTI Recognized in AOCI (Loss) Carrying Amount Gross Unrecognized Holding Gains Gross Unrecognized Holding (Losses) Fair Value As of September 30, 2018 U.S. Government & other government related $ 880 $ — $ 880 $ 7 $ (2 ) $ 885 State or local housing agency 7 — 7 — — 7 Residential MBS GSE 1,201 — 1,201 28 — 1,229 Government guaranteed 425 — 425 3 — 428 Private label 536 (121 ) 415 253 — 668 Held-to-maturity debt securities $ 3,049 $ (121 ) $ 2,928 $ 291 $ (2 ) $ 3,217 As of December 31, 2017 U.S. Government & other government related $ 1,531 $ — $ 1,531 $ 29 $ (1 ) $ 1,559 State or local housing agency 9 — 9 — — 9 Residential MBS GSE 1,513 — 1,513 62 — 1,575 Government guaranteed 585 — 585 6 — 591 Private label 662 (143 ) 519 285 — 804 Held-to-maturity debt securities $ 4,300 $ (143 ) $ 4,157 $ 382 $ (1 ) $ 4,538 We had no sales of HTM securities for the periods presented. Contractual Maturity Terms The maturity of our AFS and HTM investments is detailed in the following table. Available-for-Sale Held-to-Maturity As of September 30, 2018 Amortized Cost Basis Carrying Amount and Fair Value Carrying Amount Fair Value Year of Maturity - Due in one year or less $ 3 $ 3 $ 178 $ 177 Due after one year through five years 2 2 93 94 Due after five years through ten years 163 163 109 109 Due after ten years 288 295 507 512 ABS and MBS without a single maturity date 12,968 13,244 2,041 2,325 Total debt securities $ 13,424 $ 13,707 $ 2,928 $ 3,217 Aging of Unrealized Temporary Losses The following table presents 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. Refer to the Other-Than-Temporary Impairment Analysis section below for further discussion. 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. Less than 12 Months 12 Months or More Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Available-for-sale debt securities As of September 30, 2018 U.S. Government & other government related $ 239 $ (1 ) $ — $ — $ 239 $ (1 ) State or local housing agency 9 — — — 9 — FFELP ABS — — 597 — 597 — Residential MBS GSE 1,634 (3 ) 604 (1 ) 2,238 (4 ) Private label — — 6 — 6 — Available-for-sale debt securities $ 1,882 $ (4 ) $ 1,207 $ (1 ) $ 3,089 $ (5 ) As of December 31, 2017 U.S. Government & other government related $ 3 $ — $ — $ — $ 3 $ — State or local housing agency 4 — — — 4 — FFELP ABS — — 644 (7 ) 644 (7 ) Residential MBS GSE 51 — 801 (1 ) 852 (1 ) Private label — — 7 — 7 — Available-for-sale debt securities $ 58 $ — $ 1,452 $ (8 ) $ 1,510 $ (8 ) Held-to-maturity debt securities As of September 30, 2018 U.S. Government & other government related $ 145 $ (1 ) $ 19 $ (1 ) $ 164 $ (2 ) State or local housing agency 3 — — — 3 — Residential MBS GSE 197 — — — 197 — Government-guaranteed 179 — — — 179 — Private label — — 637 (121 ) 637 (121 ) Held-to-maturity debt securities $ 524 $ (1 ) $ 656 $ (122 ) $ 1,180 $ (123 ) As of December 31, 2017 U.S. Government & other government related $ 594 $ — $ 24 $ (1 ) $ 618 $ (1 ) State or local housing agency 2 — — — 2 — Residential MBS GSE — — 2 — 2 — Private label — — 769 (143 ) 769 (143 ) Held-to-maturity debt securities $ 596 $ — $ 795 $ (144 ) $ 1,391 $ (144 ) Other-Than-Temporary Impairment Analysis We recognized no OTTI charges on HTM or AFS debt securities for the periods presented. This is because we do not intend to sell these securities, we believe it is more likely than not that we will not be required to sell them prior to recovering their amortized cost basis, and we expect to recover the entire amortized cost basis. For further detail on our accounting policy regarding OTTI please see Note 2 - Summary of Significant Accounting Policies to the financial statements in our 2017 Form 10-K. As of September 30, 2018 , we had a base case short-term housing price forecast for all markets with projected changes ranging from -10.0% to +15.0% over the twelve month period beginning July 1, 2018. For the vast majority of markets, the short-term forecast has changes ranging from +3.0% to +7.0% . The following table presents the changes in the cumulative amount of previously recorded OTTI credit losses on investment debt securities recognized into earnings for the reporting periods indicated. Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Beginning Balance $ 459 $ 499 $ 477 $ 520 Reductions: Increases in cash flows expected to be collected and recognized into interest income (8 ) (10 ) (26 ) (31 ) Ending Balance $ 451 $ 489 $ 451 $ 489

Advances

Advances	9 Months Ended
Advances	Sep. 30, 2018
Federal Home Loan Banks [Abstract]
Federal Home Loan Bank, 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 terms of contractual maturity. Actual maturities may differ from contractual maturities because some borrowers have the right to call or prepay advances with or without penalties. As of September 30, 2018 Amount Weighted Average Contractual Interest Rate Due in one year or less $ 23,638 2.19 % One to two years 2,556 2.05 % Two to three years 2,651 2.19 % Three to four years 1,910 2.32 % Four to five years 8,175 2.42 % More than five years 15,833 2.28 % Par value $ 54,763 2.25 % We have no allowance for credit losses on our advances. See Note 8 - Allowance for Credit Losses to the financial statements for further information related to our credit risk on advances. The following table reconciles the par value of our advances to the carrying amount on our statements of condition as of the dates indicated. As of September 30, 2018 December 31, 2017 Par value $ 54,763 $ 48,020 Fair value hedging adjustments (79 ) 69 Other adjustments (17 ) (4 ) Advances $ 54,667 $ 48,085 The following advance borrowers exceeded 10% of our advances outstanding: As of September 30, 2018 Par Value % of Total Outstanding One Mortgage Partners Corp. $ 11,000 a 20.1 % The Northern Trust Company 7,700 14.1 % BMO Harris Bank, NA 6,975 12.7 % a

MPF Loans Held in Portfolio (No

MPF Loans Held in Portfolio (Notes)	9 Months Ended
MPF Loans Held in Portfolio (Notes)	Sep. 30, 2018
Receivables [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	MPF Loans Held in Portfolio We acquire MPF Loans from PFIs to hold in our portfolio and historically purchased participations in pools of eligible mortgage loans from other FHLBs (MPF Banks). MPF Loans that are held in portfolio are fixed-rate conventional and Government Loans secured by one-to-four family residential properties with maturities ranging from 5 years to 30 years or participations in pools of similar eligible mortgage loans from other MPF Banks. The following table presents information on MPF Loans held in portfolio by contractual maturity at the time of purchase. As of September 30, 2018 December 31, 2017 Medium term (15 years or less) $ 318 $ 285 Long term (greater than 15 years) 6,026 4,835 Unpaid principal balance 6,344 5,120 Net premiums, credit enhancement, and/or deferred loan fees 86 55 Fair value hedging adjustments 10 20 MPF Loans held in portfolio, before allowance for credit losses 6,440 5,195 Allowance for credit losses on MPF Loans (1 ) (2 ) MPF Loans held in portfolio, net $ 6,439 $ 5,193 Conventional mortgage loans $ 5,402 $ 4,133 Government Loans 942 987 Unpaid principal balance $ 6,344 $ 5,120 The above table excludes MPF Loans acquired under the MPF Xtra, MPF Direct, and MPF Government MBS products. See Note 2 - Summary of Significant Accounting Policies in our 2017 Form 10-K for information related to the accounting treatment of these off balance sheet MPF Loan products. See Note 8 - Allowance for Credit Losses

Allowance for Credit Losses

Allowance for Credit Losses	9 Months Ended
Allowance for Credit Losses	Sep. 30, 2018
Receivables [Abstract]
Allowance for Credit Losses [Text Block]	Allowance for Credit Losses See Note 2 - Summary of Significant Accounting Policies to the financial statements in our 2017 Form 10-K for further details regarding our allowance for credit losses methodology for each of the portfolio segments discussed below. We have identified our portfolio segments as shown below: • Member credit products (advances, letters of credit and other extensions of credit to borrowers); • Conventional MPF Loans held in portfolio; • Government Loans held in portfolio; and • Federal Funds Sold and Securities Purchased Under Agreements to Resell. Member Credit Products We have not recorded any allowance for credit losses for our member credit products portfolio segment based upon our credit analysis and the repayment history on member credit products. We had no member credit products that were past due, on nonaccrual status, involved in a troubled debt restructuring or otherwise considered impaired. We have not recorded a separate liability to reflect credit losses on our member credit products with off-balance sheet credit exposure. Conventional MPF Loans Held in Portfolio For further detail of our MPF Risk Sharing Structure see page F-16 in our 2017 Form 10-K. There has been no material activity in our allowance for credit losses since December 31, 2017 . The following table presents the recorded investment and the allowance for credit losses in conventional MPF Loans by impairment methodology. As of September 30, 2018 December 31, 2017 Recorded investment - Individually evaluated for impairment $ 38 $ 49 Collectively evaluated for impairment 5,473 4,167 Recorded investment $ 5,511 $ 4,216 Allowance for credit losses - Collectively evaluated for impairment $ 1 $ 2 Government Loans Held in Portfolio Servicers are responsible for absorbing any losses incurred on Government Loans held in portfolio that are not recovered from the government insurer or guarantor. We did not establish an allowance for credit losses on our Government Loans held in portfolio for the reporting periods presented based on our assessment that our servicers have the ability to absorb such losses. Further, Government Loans were not placed on nonaccrual status or disclosed as troubled debt restructurings for the same reason. Credit Quality Indicators - MPF Loans Held in Portfolio The following table summarizes our recorded investment in MPF Loans by our key credit quality indicators, which include: • "Serious delinquency rate" consists of MPF Loans that are 90 days or more past due or in the process of foreclosure, as a percentage of the total recorded investment. MPF Loans that are both 90 days or more past due and in the process of foreclosure are only included once in our serious delinquency rate calculation. • "Past due 90 days or more still accruing interest" consists of MPF Loans that are either insured or guaranteed by the government 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 primary mortgage insurance, of a financially responsible party) and in the process of collection. We do not recognize interest income on impaired conventional MPF Loans. • Conventional MPF Loans are individually evaluated for impairment when they are adversely classified. There is no allowance for credit losses attributable to conventional MPF Loans that are individually evaluated for impairment, since the related allowance for credit losses has been charged off. September 30, 2018 December 31, 2017 As of Conventional Government Total Conventional Government Total Past due 30-59 days $ 59 $ 37 $ 96 $ 74 $ 48 $ 122 Past due 60-89 days 14 14 28 21 16 37 Past due 90 days or more 35 18 53 48 21 69 Past due 108 69 177 143 85 228 Current 5,403 893 6,296 4,073 921 4,994 Recorded investment $ 5,511 $ 962 $ 6,473 $ 4,216 $ 1,006 $ 5,222 In process of foreclosure $ 16 $ 6 $ 22 $ 21 $ 7 $ 28 Serious delinquency rate 0.66 % 1.87 % 0.84 % 1.16 % 2.11 % 1.34 % Past due 90 days or more and still accruing interest $ 5 $ 18 $ 23 $ 8 $ 21 $ 29 Impaired loans without an allowance for credit losses and on nonaccrual status 38 — 38 49 — 49 Unpaid principal balance of impaired loans without an allowance for credit losses 41 — 41 53 — 53 Term Federal Funds Sold and Term Securities Purchased Under Agreements to Resell We only held overnight Federal Funds sold and Securities Purchased Under Agreements to Resell as of September 30, 2018 , and December 31, 2017

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
Derivatives and Hedging Activities	Sep. 30, 2018
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 Policies in our 2017 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. We are not a derivatives dealer and do not trade derivatives for speculative purposes. We enter into derivative transactions through either of the following: • A bilateral agreement with an individual counterparty for over-the-counter derivative transactions. • Clearinghouses classified as Derivatives Clearing Organizations (DCOs) through Futures Commission Merchants (FCMs), which are clearing members of the DCOs, for cleared derivative transactions. Managing Interest Rate Risk We use fair value hedges to offset changes in the fair value of a benchmark interest rate, for example London Interbank Offering Rate (LIBOR), related to (1) a recognized asset or liability or (2) an unrecognized firm commitment. Our hedge strategy for cash flow hedges is to hedge the total proceeds received from rolling forecasted zero-coupon discount note issuances attributable to changes in the benchmark interest rate or LIBOR by entering into interest rate swaps to mitigate such risk. We use economic hedges in cases where hedge accounting treatment is not permitted or achievable; for example, hedges of portfolio interest rate risk or financial instruments carried at fair value under the fair value option. Managing Credit Risk on Derivative Agreements Over-the-counter (bilateral) Derivative Transactions : 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, collateral requirements and other credit enhancements 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 over-the-counter derivatives. Additionally, collateral related to over-the-counter derivatives with member institutions includes collateral assigned to us, as evidenced by a written security agreement, and which may be held by the member institution for our benefit. Based on credit analyses and collateral requirements, we do not anticipate any credit losses on our over-the-counter derivative agreements. See Note 16 - Fair Value in our 2017 Form 10-K for discussion regarding our fair value methodology for over-the-counter derivative assets and liabilities, including an evaluation of the potential for the fair value of these instruments to be affected by counterparty credit risk. For nearly all of our bilateral derivative transactions executed prior to March 1, 2017, and for all transactions entered into after March 1, 2017, our bilateral derivative agreements are fully collateralized with a zero unsecured threshold in accordance with variation margin requirements issued by the U.S. federal bank regulatory agencies and the Commodity Futures Trading Commission (CFTC). For certain transactions executed prior to March 1, 2017, we may be required to post net additional collateral with our counterparties if there is deterioration in our credit rating. If our credit rating had been lowered from its current rating to the next lower rating by a major credit rating agency, such as Standard and Poor's or Moody’s, the amount of collateral we would have been required to deliver would no t have been material at September 30, 2018 . Cleared Derivative Transactions : Cleared derivative transactions are subject to variation and initial margin requirements established by the DCO and its clearing members. As a result of rule changes adopted by our DCOs, variation margin payments are characterized as settlement of a derivative’s mark-to-market exposure and not as collateral against the derivative’s mark-to-market exposure. See Note 1 - Background and Basis of Presentation and Note 2 - Summary of Significant Accounting Policies to the financial statements in this Form 10-Q and our 2017 Form 10-K for further discussion. We post our initial margin collateral payments and make variation margin settlement payments through our FCMs, on behalf of the DCO, which could expose us to institutional credit risk in the event that the FCMs or the DCO fail to meet their obligations. Clearing derivatives through a DCO mitigates counterparty credit risk exposure because the DCO is substituted for individual counterparties and variation margin settlement payments are made daily through the FCMs for changes in the value of cleared derivatives. The DCO determines initial margin requirements for cleared derivatives. In this regard, we pledged $177 million of investment securities that can be sold or repledged, as part of our initial margin related to cleared derivative transactions at September 30, 2018 . Additionally, an FCM may require additional initial margin to be posted based on credit considerations, including but not limited to, if our credit rating downgrades. We had no requirement to post additional initial margin by our FCMs at September 30, 2018 . The following table presents details on the notional amounts, and cleared and bilateral derivative assets and liabilities on our statements of condition. To conform with our current presentation method, we reclassified variation margin for cleared derivatives as of December 31, 2017, in the amounts of $16 million on our derivative assets and $168 million on our derivative liabilities, to the appropriate interest rate contracts line items. 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, by contract (e.g., master netting agreement) or otherwise, to offset cash flow obligations between us and our counterparty into a single net payable or receivable. September 30, 2018 December 31, 2017 As of Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives in hedge accounting relationships- Interest rate contracts $ 31,281 $ 60 $ 338 $ 26,655 $ 25 $ 367 Derivatives not in hedge accounting relationships- Interest rate contracts 20,696 110 81 20,506 199 122 Other 811 1 1 810 1 1 Derivatives not in hedge accounting relationships 21,507 111 82 21,316 200 123 Gross derivative amount before netting adjustments and cash collateral $ 52,788 171 420 $ 47,971 225 490 Netting adjustments and cash collateral (160 ) (395 ) (222 ) (470 ) Derivatives on statements of condition $ 11 $ 25 $ 3 $ 20 Cash collateral received on derivative assets $ 45 $ 35 Cash collateral posted on derivative liabilities $ 281 $ 284 The following table presents the noninterest income on derivatives and hedging activities as presented in the statements of income. The amounts attributable to fair value and cash flow hedges represent hedge ineffectiveness. Three months ended September 30, Nine months ended September 30, For the periods ending 2018 2017 2018 2017 Fair value hedges - interest rate contracts $ (6 ) $ (3 ) $ (6 ) $ (3 ) Cash flow hedges - interest rate contracts — 1 1 2 Economic hedges - Interest rate contracts 2 2 1 3 Other (1 ) — (2 ) 3 Economic hedges 1 2 (1 ) 6 Variation margin on daily settled cleared derivatives — — 1 1 Noninterest income on derivatives and hedging activities $ (5 ) $ — $ (5 ) $ 6 The following table presents details regarding the offsetting of our derivative assets and liabilities on our statements of condition. 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, by contract (e.g., master netting agreement) or otherwise, to offset cash flow obligations between us and our counterparty into a single net payable or receivable. Derivative Assets Derivative Liabilities Bilateral Cleared Total Bilateral Cleared Total As of September 30, 2018 Derivatives with legal right of offset - Gross recognized amount $ 148 $ 23 $ 171 $ 381 $ 38 $ 419 Netting adjustments and cash collateral (138 ) (22 ) (160 ) (374 ) (21 ) (395 ) Derivatives with legal right of offset - net 10 1 11 7 17 24 Derivatives without legal right of offset — — — 1 — 1 Derivatives on statements of condition 10 1 11 8 17 25 Less: Noncash collateral received or pledged and cannot be sold or repledged — — — — 17 17 Net amount $ 10 $ 1 $ 11 $ 8 $ — $ 8 As of December 31, 2017 Derivatives with legal right of offset - Gross recognized amount $ 216 $ 8 $ 224 $ 476 $ 13 $ 489 Netting adjustments and cash collateral (214 ) (8 ) (222 ) (463 ) (7 ) (470 ) Derivatives with legal right of offset - net 2 — 2 13 6 19 Derivatives without legal right of offset 1 — 1 1 — 1 Derivatives on statements of condition 3 — 3 14 6 20 Less: Noncash collateral received or pledged and cannot be sold or repledged — (1 ) (1 ) — 6 6 Net amount $ 3 $ 1 $ 4 $ 14 $ — $ 14 At September 30, 2018 , we had $160 million of additional credit exposure on cleared derivatives due to pledging of noncash collateral to our DCOs for initial margin, which exceeded our derivative position. We had $60 million of comparable exposure at December 31, 2017 . Fair Value Hedges The following table presents our fair value hedging results by the type of hedged item. We had no gain (loss) for hedges that no longer qualified as a fair value hedge. Additionally, the table indicates where fair value hedging results are classified in our statements of income. In this regard, the Amount Recorded in Net Interest Income column includes the following: • The amortization of closed fair value hedging adjustments, which are included in the interest income/expense line item of the respective hedged item type. • The effect of net interest settlements attributable to open derivative hedging instruments, which are recorded directly to the interest income/expense line item of the respective hedged item type. Gain (Loss) on Hedging Instrument Gain (Loss) on Hedged Item Total Ineffectiveness Recognized in Derivatives and Hedging Activities Amount Recorded in Net Interest Income Three months ended September 30, 2018 Available-for-sale debt securities $ 46 $ (50 ) $ (4 ) $ (14 ) Advances 43 (47 ) (4 ) 6 MPF Loans held for portfolio — — — (1 ) Consolidated obligation bonds (17 ) 19 2 (18 ) Total $ 72 $ (78 ) $ (6 ) $ (27 ) Three months ended September 30, 2017 Available-for-sale debt securities $ 23 $ (26 ) $ (3 ) $ (21 ) Advances 9 (9 ) — (8 ) MPF Loans held for portfolio — — — (2 ) Consolidated obligation bonds (4 ) 4 — 7 Total $ 28 $ (31 ) $ (3 ) $ (24 ) Nine months ended September 30, 2018 Available-for-sale debt securities $ 95 $ (101 ) $ (6 ) $ (44 ) Advances 150 (148 ) 2 9 MPF Loans held for portfolio — — — (3 ) Consolidated obligation bonds (166 ) 164 (2 ) (34 ) Total $ 79 $ (85 ) $ (6 ) $ (72 ) Nine months ended September 30, 2017 Available-for-sale debt securities $ 58 $ (64 ) $ (6 ) $ (70 ) Advances (6 ) 9 3 (27 ) MPF Loans held for portfolio — — — (5 ) Consolidated obligation bonds 55 (55 ) — 29 Total $ 107 $ (110 ) $ (3 ) $ (73 ) Cash Flow Hedges We are exposed to the variability in the total net proceeds received from forecasted zero-coupon discount note issuances, which is attributable to changes in the benchmark interest rate, London Interbank Offering Rate (LIBOR). As a result, we enter into cash flow hedge relationships utilizing derivative agreements to hedge the total net proceeds received from our "rolling" forecasted zero-coupon discount note issuances attributable to changes in LIBOR. The maximum length of time over which we are hedging this exposure is 10 years . We reclassify amounts in AOCI into our statements of income in the same periods during which the hedged forecasted transaction affects our earnings. We had no discontinued hedges for the periods presented. The deferred net gains (losses) on derivative instruments in AOCI that are expected to be reclassified to earnings during the next twelve months were no t material as of September 30, 2018 . The following table presents our cash flow hedging results by type of hedged item. Additionally, the table indicates where cash flow hedging results are classified in our statements of income. In this regard, the Amount Recorded in Net Interest Income column includes the following: • The amortization of closed cash flow hedging adjustments, which are reclassified from AOCI into the interest income/expense line item of the respective hedged item type. • The effect of net interest settlements attributable to open derivative hedging instruments, which are recorded directly to the interest income/expense line item of the respective hedged item type. Ineffectiveness Recorded in Derivatives and Hedging Activities Effective Portion Recorded in AOCI Amount Recorded in Net Interest Income Three months ended September 30, 2018 Discount notes $ — $ 15 $ (22 ) Three months ended September 30, 2017 Advances $ — $ — $ 1 Discount notes 1 44 (40 ) Total $ 1 $ 44 $ (39 ) Nine months ended September 30, 2018 Advances $ — $ — $ 1 Discount notes 1 103 (86 ) Bonds — — (1 ) Total $ 1 $ 103 $ (86 ) Nine months ended September 30, 2017 Advances $ — $ — $ 7 Discount notes 2 117 (128 ) Bonds — — (2 ) Total $ 2 $ 117 $ (123 )

Consolidated Obligations

Consolidated Obligations	9 Months Ended
Consolidated Obligations	Sep. 30, 2018
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Consolidated Obligations The FHLBs issue consolidated obligations through the Office of Finance as their agent. Consolidated obligations consist of discount notes and consolidated obligation bonds. Consolidated discount notes are issued to raise short-term funds, are issued at less than their face amount and redeemed at par value when they mature. The maturity of consolidated obligation bonds may range from less than one year to over 20 years , but they are not subject to any statutory or regulatory limits on maturity. 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 September 30, 2018 December 31, 2017 Carrying Amount $ 37,674 $ 41,191 Weighted Average Interest Rate 1.98 % 1.23 % The following table presents our consolidated obligation bonds, for which we are the primary obligor, including callable bonds that are redeemable in whole, or in part, at our discretion on predetermined call dates. As of September 30, 2018 Contractual Maturity Weighted Average Interest Rate By Maturity or Next Call Date Due in one year or less $ 24,310 1.88 % $ 35,432 One to two years 7,011 1.82 % 6,503 Two to three years 4,714 2.16 % 1,867 Three to four years 4,152 2.23 % 1,268 Four to five years 2,061 2.94 % 983 Thereafter 4,369 3.03 % 564 Total par value $ 46,617 2.08 % $ 46,617 The following table presents consolidated obligation bonds outstanding by call feature: As of September 30, 2018 December 31, 2017 Noncallable $ 33,202 $ 23,644 Callable 13,415 13,703 Par value 46,617 37,347 Fair value hedging adjustments (373 ) (214 ) Other adjustments (12 ) (12 ) Consolidated obligation bonds $ 46,232 $ 37,121 The following table summarizes the consolidated obligations of the FHLBs and those for which we are the primary obligor. We did not accrue a liability for our joint and several liability related to the other FHLBs’ share of the consolidated obligations as of September 30, 2018 , and December 31, 2017 . See Note 17 - Commitments and Contingencies in our 2017 Form 10-K for further details. September 30, 2018 December 31, 2017 Par values as of Bonds Discount Notes Total Bonds Discount Notes Total FHLB System total consolidated obligations $ 615,216 $ 403,882 $ 1,019,098 $ 642,211 $ 392,049 $ 1,034,260 FHLB Chicago as primary obligor 46,617 37,741 84,358 37,347 41,235 78,582 As a percent of the FHLB System 8 % 9 % 8 % 6 % 11 % 8 %

Capital and Mandatorily Redeema

Capital and Mandatorily Redeemable Capital Stock (MRCS)	9 Months Ended
Capital and Mandatorily Redeemable Capital Stock (MRCS)	Sep. 30, 2018
Federal Home Loan Banks [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Capital and Mandatorily Redeemable Capital Stock (MRCS) Under our Capital Plan our stock consists of two sub-classes of stock, Class B1 activity stock and Class B2 membership 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 activity stock is available to support a member's activity stock requirement. Class B2 membership stock is available to support a member's membership stock requirement and any activity stock requirement. See Note 13 – Capital and Mandatorily Redeemable Capital Stock (MRCS) to the financial statements in our 2017 Form 10-K for further information on our capital stock and MRCS. Minimum Capital Requirements For details on our minimum capital requirements, including how the ratios below were calculated, see Minimum Capital Requirements on page F-44 of our 2017 Form 10-K. We complied with our minimum regulatory capital requirements as shown below. September 30, 2018 December 31, 2017 Requirement Actual Requirement Actual Risk-based capital $ 1,219 $ 5,519 $ 1,075 $ 5,051 Total regulatory capital $ 3,656 $ 5,519 $ 3,374 $ 5,051 Total regulatory capital ratio 4.00 % 6.04 % 4.00 % 5.99 % Leverage capital $ 4,571 $ 8,278 $ 4,218 $ 7,577 Leverage capital ratio 5.00 % 9.06 % 5.00 % 8.98 % Total regulatory capital and leverage capital includes mandatorily redeemable capital stock (MRCS) but does not include AOCI. Under the FHFA regulation on capital classifications and critical capital levels for the FHLBs, we are adequately capitalized. The following members had regulatory capital stock exceeding 10% of our total regulatory capital stock outstanding (which includes MRCS): As of September 30, 2018 Regulatory Capital Stock Outstanding % of Total Outstanding Amount of Which is Classified as a Liability (MRCS) BMO Harris Bank, NA $ 314 15.5 % $ — The Northern Trust Company 247 12.2 % — One Mortgage Partners Corp. 245 a 12.1 % 245 a One Mortgage Partners Corp. is a subsidiary of JPMorgan Chase Bank NA. Dividends Our ability to pay dividends is subject to the FHLB Act and FHFA regulations. On October 23, 2018, our Board of Directors declared a 4.50% dividend (annualized) for Class B1 activity stock and a 1.80% dividend (annualized) for Class B2 membership stock based on our preliminary financial results for the third quarter of 2018. This dividend, including dividends on mandatorily redeemable capital stock, totaled $20 million and is scheduled for payment on November 15, 2018.The Class B2 capital stock dividend is intended to enhance the value of membership; the Class B1 capital stock dividend reduces the effective cost of borrowing from the Bank and rewards our members who support the entire cooperative by using our advance products. Any future dividend determination by our Board will be at our Board's sole discretion and will depend on future operating results, our Retained Earnings and Dividend Policy and any other factors the Board determines to be relevant. Repurchase of Excess Capital Stock We repurchase all excess Class B2 membership stock on a weekly basis at par value, i.e., at $100 per share .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
Accumulated Other Comprehensive Income (Loss)	Sep. 30, 2018
Equity [Abstract]
Comprehensive Income (Loss) Note [Text Block]	Accumulated Other Comprehensive Income (Loss) The following table summarizes the gains (losses) in AOCI for the reporting periods indicated. Net Unrealized - Non-credit OTTI - Net Unrealized - Cash Flow Hedges Available-for-sale Securities Held-to-maturity Securities Post-Retirement Plans AOCI Three months ended September 30, 2018 Beginning balance $ 315 $ (128 ) $ (57 ) $ (8 ) $ 122 Change in the period recorded to the statements of condition, before reclassifications to statements of income (32 ) 7 15 (5 ) (15 ) Amounts reclassified in period to statements of income: Net interest income — — 10 10 Noninterest expense 1 1 Ending balance $ 283 $ (121 ) $ (32 ) $ (12 ) $ 118 Three months ended September 30, 2017 Beginning balance $ 478 $ (160 ) $ (243 ) $ (8 ) $ 67 Change in the period recorded to the statements of condition, before reclassifications to statements of income (24 ) 8 44 3 31 Amounts reclassified in period to statements of income: Net interest income — — (1 ) (1 ) Noninterest gain (loss) — — (1 ) (1 ) Ending balance $ 454 $ (152 ) $ (201 ) $ (5 ) $ 96 Nine months ended September 30, 2018 Beginning balance $ 407 $ (143 ) $ (147 ) $ (5 ) $ 112 Change in the period recorded to the statements of condition, before reclassifications to statements of income (124 ) 22 103 (8 ) (7 ) Amounts reclassified in period to statements of income: Net interest income — — 13 13 Noninterest gain (loss) — — (1 ) (1 ) Noninterest expense 1 1 Ending balance $ 283 $ (121 ) $ (32 ) $ (12 ) $ 118 Nine months ended September 30, 2017 Beginning balance $ 459 $ (177 ) $ (312 ) $ (6 ) $ (36 ) Change in the period recorded to the statements of condition, before reclassifications to statements of income (5 ) 25 117 1 138 Amounts reclassified in period to statements of income: Net interest income — — (4 ) (4 ) Noninterest gain (loss) — — (2 ) (2 ) Ending balance $ 454 $ (152 ) $ (201 ) $ (5 ) $ 96

Fair Value

Fair Value	9 Months Ended
Fair Value	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Fair Value The following table is a summary of the fair value estimates and related levels in the hierarchy. The carrying amounts are per the statements of condition. Fair value estimates represent the exit prices that we would receive to sell assets or pay to transfer liabilities in an orderly transaction with market participants at the measurement date. They do not represent an estimate of our overall market value as a going concern, as they do not take into account future business opportunities or profitability of assets and liabilities. We measure instrument-specific credit risk attributable to our consolidated obligations based on our nonperformance risk, which includes the credit risk associated with the joint and several liability of other FHLBs. As a result, we did not recognize any instrument-specific credit risk attributable to our consolidated obligations that are carried at fair value. See Note 2 - Summary of Significant Accounting Policies in our 2017 Form 10-K for our fair value policies and Note 16 - Fair Value in our 2017 Form 10-K for our valuation techniques and significant inputs. See Note 9 - Derivatives and Hedging Activities for more information on the Netting and Cash Collateral amounts. Carrying Amount Fair Value Level 1 Level 2 Level 3 Netting & Cash Collateral September 30, 2018 Carried at amortized cost Cash and due from banks $ 44 $ 44 $ 44 $ — $ — Interest bearing deposits 775 775 775 — — Federal Funds sold and securities purchased under agreements to resell 9,835 9,835 — 9,835 — Held-to-maturity debt securities 2,928 3,217 — 2,549 668 Advances 53,759 53,784 — 53,784 — MPF Loans held in portfolio, net 6,433 6,396 — 6,387 9 Other assets 169 169 — 169 — Carried at fair value on a recurring basis Trading securities 2,596 2,596 — 2,596 — Government related non-MBS, ABS, and MBS 13,663 13,663 — 13,663 — Private label residential MBS 44 44 — — 44 Available-for-sale debt securities 13,707 13,707 — 13,663 44 Advances - fair value option election 908 908 — 908 — Derivative assets 11 11 1 170 — $ (160 ) Other assets - fair value option election 116 116 — 116 — Carried at fair value on a nonrecurring basis MPF Loans held in portfolio, net 6 6 — — 6 Other assets 1 1 — — 1 Financial assets 91,288 $ 91,565 $ 820 $ 90,177 $ 728 $ (160 ) Other non financial assets 122 Assets $ 91,410 Carried at amortized cost Deposits $ (581 ) $ (581 ) $ — $ (581 ) $ — Consolidated obligation discount notes (37,674 ) (37,667 ) — (37,667 ) — Consolidated obligation bonds (44,030 ) (43,996 ) — (43,996 ) — Mandatorily redeemable capital stock (313 ) (313 ) (313 ) — — Other liabilities (154 ) (154 ) — (154 ) — Carried at fair value on a recurring basis Consolidated obligation bonds - fair value option (2,202 ) (2,202 ) — (2,202 ) — Derivative liabilities (25 ) (25 ) — (420 ) — $ 395 Financial liabilities (84,979 ) $ (84,938 ) $ (313 ) $ (85,020 ) $ — $ 395 Other non financial liabilities (1,107 ) Liabilities $ (86,086 ) Carrying Amount Fair Value Level 1 Level 2 Level 3 Netting December 31, 2017 Carried at amortized cost Cash and due from banks $ 42 $ 42 $ 42 $ — $ — Interest bearing deposits 775 775 775 — — Federal Funds sold and securities purchased under agreements to resell 12,561 12,561 — 12,561 — Held-to-maturity debt securities 4,157 4,538 — 3,734 804 Advances 47,309 47,336 — 47,336 — MPF Loans held in portfolio, net 5,186 5,306 — 5,295 11 Other assets 119 119 — 119 — Carried at fair value on a recurring basis Trading securities 233 233 — 233 — Government related non-MBS, ABS, and MBS 12,907 12,907 — 12,907 — Private label residential MBS 50 50 — — 50 Available-for-sale debt securities 12,957 12,957 — 12,907 50 Advances - fair value option election 776 776 — 776 — Derivative assets 3 3 — 225 — $ (222 ) Other assets - fair value option election 118 118 — 118 — Carried at fair value on a nonrecurring basis MPF Loans held in portfolio, net 7 7 — — 7 Other assets 3 3 — — 3 Financial assets 84,246 $ 84,774 $ 817 $ 83,304 $ 875 $ (222 ) Other non financial assets 109 Assets $ 84,355 Carried at amortized cost Deposits (524 ) (524 ) — (524 ) — Consolidated obligation discount notes (40,442 ) (40,437 ) — (40,437 ) — Consolidated obligation bonds (31,861 ) (32,011 ) — (32,011 ) — Mandatorily redeemable capital stock (311 ) (311 ) (311 ) — — Other liabilities (94 ) (94 ) — (94 ) — Carried at fair value on a recurring basis Consolidated obligation discount notes - fair value option (749 ) (749 ) — (749 ) — Consolidated obligation bonds - fair value option (5,260 ) (5,260 ) — (5,260 ) — Derivative liabilities (20 ) (20 ) — (490 ) — 470 Financial liabilities (79,261 ) $ (79,406 ) $ (311 ) $ (79,565 ) $ — $ 470 Other non financial liabilities (242 ) Liabilities $ (79,503 ) We had no transfers between levels for the periods shown. Fair Value Option We may elect the fair value option for financial instruments, such as advances, MPF Loans held for sale, and consolidated obligation discount notes and bonds, in cases where hedge accounting treatment may not be achieved due to the inability to meet the hedge effectiveness testing criterion. Financial instruments for which we elected the fair value option along with their related fair value are shown on our Statements of Condition. Refer to our Note 2 – Summary of Significant Accounting Policies to the financial statements in our 2017 Form 10-K for further details. The following table presents the changes in fair values of financial assets and liabilities carried at fair value under the fair value option. These changes were recognized in noninterest income - instruments held under the fair value option in our statements of income. Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Advances $ (1 ) $ (1 ) $ (11 ) $ 2 Discount notes — (1 ) — (1 ) Consolidated obligation bonds (1 ) (3 ) (3 ) (3 ) Other assets (1 ) — (6 ) (1 ) Noninterest income - Instruments held under fair value option $ (3 ) $ (5 ) $ (20 ) $ (3 ) The following table reflects the difference between the aggregate unpaid principal balance (UPB) outstanding and the aggregate fair value for our long term financial instruments for which the fair value option has been elected. None of the advances were 90 days or more past due and none were on nonaccrual status. September 30, 2018 December 31, 2017 As of Advances Consolidated Obligation Bonds Advances Consolidated Obligation Bonds Unpaid principal balance $ 929 $ 2,213 $ 786 $ 5,270 Fair value over (under) UPB (21 ) (11 ) (10 ) (10 ) Fair value $ 908 $ 2,202 $ 776 $ 5,260

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies [Text Block]	Commitments and Contingencies The following table shows our commitments outstanding, which represent off-balance sheet obligations. September 30, 2018 December 31, 2017 As of Expire within one year Expire after one year Total Expire within one year Expire after one year Total Unsettled consolidated obligation bonds $ 25 $ — $ 25 $ — $ — $ — Member standby letters of credit 18,407 4,308 a 22,715 15,703 3,869 a 19,572 Housing authority standby bond purchase agreements 71 295 366 — 337 337 Advance commitments 1,647 3 1,650 151 — 151 MPF delivery commitments 433 — 433 371 — 371 Other 3 — 3 14 — 14 Commitments $ 20,586 $ 4,606 $ 25,192 $ 16,239 $ 4,206 $ 20,445 a Contains $1.6 billion and $750 million of member standby letters of credit as of September 30, 2018 , and December 31, 2017 , which were renewable annually. For a description of defined terms see Note 17 - Commitments and Contingencies to the financial statements in our 2017

Transactions with Related Parti

Transactions with Related Parties and Other FHLBs	9 Months Ended
Transactions with Related Parties and Other FHLBs	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	Transactions with Related Parties and Other FHLBs We define related parties as either members whose officers or directors serve on our Board of Directors, or members that control more than 10% of our total voting interests. We did not have any members that controlled more than 10% of our total voting interests for the periods presented in these financial statements. In the normal course of business, we may extend credit to or enter into other transactions with a related party. These 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 following table summarizes material balances we had with our members who are related parties as defined above (including their affiliates) as of the periods presented. The related impacts to our Statements of Income were no t material. As of September 30, 2018 December 31, 2017 Assets - Advances $ 629 $ 165 Liabilities - Deposits 6 13 Equity - Capital Stock 27 10 Other FHLBs From time to time, we may loan to, or borrow from, other FHLBs. These transactions are done at market terms that are no more favorable than the terms of comparable transactions with other counterparties. These transactions are overnight, maturing the following business day. In addition, we provide programmatic and operational support in our role as the administrator of the MPF Program on behalf of the other MPF Banks for a fee. Material transactions with other FHLBs are identified on the face of our Financial Statements .

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2018
Accounting Policies [Abstract]
Fair Value of Financial Instruments, Policy [Policy Text Block]	Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01)
Revenue Recognition, Policy [Policy Text Block]	Revenue from Contracts with Customers (ASU 2014-09)
Pension and Other Postretirement Plans, Policy [Policy Text Block]	Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07)
Interest Expense, Policy [Policy Text Block]	Classification of Certain Cash Receipts and Cash Payments in the Statement of Cash Flows (ASU 2016-15)

Interest Income and Interest _2

Interest Income and Interest Expense (Tables)	9 Months Ended
Interest Income and Interest Expense (Tables)	Sep. 30, 2018
Interest Income (Expense), Net [Abstract]
Interest Income and Interest Expense [Table Text Block]	The following table presents interest income and interest expense for the periods indicated: Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Interest income - Trading $ 8 $ 1 $ 23 $ 3 Available-for-sale interest income 107 106 318 321 Available-for-sale prepayment fees 7 9 27 20 Available-for-sale 114 115 345 341 Held-to-maturity 46 47 135 148 Investment debt securities 168 163 503 492 Advances 312 157 811 386 MPF Loans held in portfolio 62 53 177 160 Federal funds sold and securities purchased under agreements to resell 54 34 152 74 Other 7 4 17 9 Interest income 603 411 1,660 1,121 Interest expense - Consolidated obligations - Discount notes 208 148 596 363 Bonds 263 136 665 394 Other 6 4 17 11 Interest expense 477 288 1,278 768 Net interest income 126 123 $ 382 $ 353 Provision for (reversal of) credit losses (1 ) (1 ) (1 ) — Net interest income after provision for (reversal of) credit losses $ 127 $ 124 $ 383 $ 353

Investment Debt Securities (Tab

Investment Debt Securities (Tables)	9 Months Ended
Investment Debt Securities (Tables)	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Trading Securities by Major Security Type [Table Text Block]	The following table presents the fair value of our trading debt securities. Our unrealized gains (losses) on trading debt securities still held on our statement of condition as of the end of the reporting period were $8 million at September 30, 2018 and were not material at December 31, 2017. As of September 30, 2018 December 31, 2017 U.S. Government & other government related $ 2,574 $ 202 Residential MBS GSE 21 30 Government guaranteed 1 1 Trading debt securities $ 2,596 $ 233
Available-for-sale Securities by Major Security Type [Table Text Block]	Amortized Cost Basis and Fair Value – Available-for-Sale Debt Securities (AFS) Amortized Cost Basis Gross Unrealized Gains in AOCI Gross Unrealized (Losses) in AOCI Carrying Amount and Fair Value As of September 30, 2018 U.S. Government & other government related $ 440 $ 8 $ (1 ) $ 447 State or local housing agency 16 — — 16 FFELP ABS 3,680 220 — 3,900 Residential MBS GSE 8,520 38 (4 ) 8,554 Government guaranteed 732 14 — 746 Private label 36 8 — 44 Available-for-sale debt securities $ 13,424 $ 288 $ (5 ) $ 13,707 As of December 31, 2017 U.S. Government & other government related $ 256 $ 15 $ — $ 271 State or local housing agency 21 — — 21 FFELP ABS 3,987 234 (7 ) 4,214 Residential MBS GSE 7,275 132 (1 ) 7,406 Government guaranteed 971 24 — 995 Private label 40 10 — 50 Available-for-sale debt securities $ 12,550 $ 415 $ (8 ) $ 12,957 We had no sales of AFS securities for the periods presented.
Held-to-maturity Securities by Major Security Type [Table Text Block]	Amortized Cost Basis, Carrying Amount, and Fair Value - Held-to-Maturity Debt Securities (HTM) Amortized Cost Basis Non-credit OTTI Recognized in AOCI (Loss) Carrying Amount Gross Unrecognized Holding Gains Gross Unrecognized Holding (Losses) Fair Value As of September 30, 2018 U.S. Government & other government related $ 880 $ — $ 880 $ 7 $ (2 ) $ 885 State or local housing agency 7 — 7 — — 7 Residential MBS GSE 1,201 — 1,201 28 — 1,229 Government guaranteed 425 — 425 3 — 428 Private label 536 (121 ) 415 253 — 668 Held-to-maturity debt securities $ 3,049 $ (121 ) $ 2,928 $ 291 $ (2 ) $ 3,217 As of December 31, 2017 U.S. Government & other government related $ 1,531 $ — $ 1,531 $ 29 $ (1 ) $ 1,559 State or local housing agency 9 — 9 — — 9 Residential MBS GSE 1,513 — 1,513 62 — 1,575 Government guaranteed 585 — 585 6 — 591 Private label 662 (143 ) 519 285 — 804 Held-to-maturity debt securities $ 4,300 $ (143 ) $ 4,157 $ 382 $ (1 ) $ 4,538 We had no
Investments Classified by Contractual Maturity Date [Table Text Block]	The maturity of our AFS and HTM investments is detailed in the following table. Available-for-Sale Held-to-Maturity As of September 30, 2018 Amortized Cost Basis Carrying Amount and Fair Value Carrying Amount Fair Value Year of Maturity - Due in one year or less $ 3 $ 3 $ 178 $ 177 Due after one year through five years 2 2 93 94 Due after five years through ten years 163 163 109 109 Due after ten years 288 295 507 512 ABS and MBS without a single maturity date 12,968 13,244 2,041 2,325 Total debt securities $ 13,424 $ 13,707 $ 2,928 $ 3,217
Schedule of Unrealized Loss on Investments [Table Text Block]	The following table presents 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. Refer to the Other-Than-Temporary Impairment Analysis section below for further discussion. 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. Less than 12 Months 12 Months or More Total Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Fair Value Gross Unrealized (Losses) Available-for-sale debt securities As of September 30, 2018 U.S. Government & other government related $ 239 $ (1 ) $ — $ — $ 239 $ (1 ) State or local housing agency 9 — — — 9 — FFELP ABS — — 597 — 597 — Residential MBS GSE 1,634 (3 ) 604 (1 ) 2,238 (4 ) Private label — — 6 — 6 — Available-for-sale debt securities $ 1,882 $ (4 ) $ 1,207 $ (1 ) $ 3,089 $ (5 ) As of December 31, 2017 U.S. Government & other government related $ 3 $ — $ — $ — $ 3 $ — State or local housing agency 4 — — — 4 — FFELP ABS — — 644 (7 ) 644 (7 ) Residential MBS GSE 51 — 801 (1 ) 852 (1 ) Private label — — 7 — 7 — Available-for-sale debt securities $ 58 $ — $ 1,452 $ (8 ) $ 1,510 $ (8 ) Held-to-maturity debt securities As of September 30, 2018 U.S. Government & other government related $ 145 $ (1 ) $ 19 $ (1 ) $ 164 $ (2 ) State or local housing agency 3 — — — 3 — Residential MBS GSE 197 — — — 197 — Government-guaranteed 179 — — — 179 — Private label — — 637 (121 ) 637 (121 ) Held-to-maturity debt securities $ 524 $ (1 ) $ 656 $ (122 ) $ 1,180 $ (123 ) As of December 31, 2017 U.S. Government & other government related $ 594 $ — $ 24 $ (1 ) $ 618 $ (1 ) State or local housing agency 2 — — — 2 — Residential MBS GSE — — 2 — 2 — Private label — — 769 (143 ) 769 (143 ) Held-to-maturity debt securities $ 596 $ — $ 795 $ (144 ) $ 1,391 $ (144 )
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]	The following table presents the changes in the cumulative amount of previously recorded OTTI credit losses on investment debt securities recognized into earnings for the reporting periods indicated. Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Beginning Balance $ 459 $ 499 $ 477 $ 520 Reductions: Increases in cash flows expected to be collected and recognized into interest income (8 ) (10 ) (26 ) (31 ) Ending Balance $ 451 $ 489 $ 451 $ 489

Advances (Tables)

Advances (Tables)	9 Months Ended
Advances (Tables)	Sep. 30, 2018
Federal Home Loan Banks [Abstract]
Federal Home Loan Bank, Advances [Table Text Block]	The following table presents our advances by terms of contractual maturity. Actual maturities may differ from contractual maturities because some borrowers have the right to call or prepay advances with or without penalties. As of September 30, 2018 Amount Weighted Average Contractual Interest Rate Due in one year or less $ 23,638 2.19 % One to two years 2,556 2.05 % Two to three years 2,651 2.19 % Three to four years 1,910 2.32 % Four to five years 8,175 2.42 % More than five years 15,833 2.28 % Par value $ 54,763 2.25 % We have no allowance for credit losses on our advances. See Note 8 - Allowance for Credit Losses to the financial statements for further information related to our credit risk on advances. The following table reconciles the par value of our advances to the carrying amount on our statements of condition as of the dates indicated. As of September 30, 2018 December 31, 2017 Par value $ 54,763 $ 48,020 Fair value hedging adjustments (79 ) 69 Other adjustments (17 ) (4 ) Advances $ 54,667 $ 48,085
Credit Concentration Risk
Concentration Risk [Line Items]
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	The following advance borrowers exceeded 10% of our advances outstanding: As of September 30, 2018 Par Value % of Total Outstanding One Mortgage Partners Corp. $ 11,000 a 20.1 % The Northern Trust Company 7,700 14.1 % BMO Harris Bank, NA 6,975 12.7 % a One Mortgage Partners Corp. is a subsidiary of JPMorgan Chase Bank NA.

MPF Loans Held in Portfolio (Ta

MPF Loans Held in Portfolio (Tables)	9 Months Ended
MPF Loans Held in Portfolio (Tables)	Sep. 30, 2018
Receivables [Abstract]
Schedule of Participating Mortgage Loans [Table Text Block]	The following table presents information on MPF Loans held in portfolio by contractual maturity at the time of purchase. As of September 30, 2018 December 31, 2017 Medium term (15 years or less) $ 318 $ 285 Long term (greater than 15 years) 6,026 4,835 Unpaid principal balance 6,344 5,120 Net premiums, credit enhancement, and/or deferred loan fees 86 55 Fair value hedging adjustments 10 20 MPF Loans held in portfolio, before allowance for credit losses 6,440 5,195 Allowance for credit losses on MPF Loans (1 ) (2 ) MPF Loans held in portfolio, net $ 6,439 $ 5,193 Conventional mortgage loans $ 5,402 $ 4,133 Government Loans 942 987 Unpaid principal balance $ 6,344 $ 5,120 The above table excludes MPF Loans acquired under the MPF Xtra, MPF Direct, and MPF Government MBS products. See Note 2 - Summary of Significant Accounting Policies

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	9 Months Ended
Allowance for Credit Losses (Tables)	Sep. 30, 2018
Receivables [Abstract]
Allowance for Credit Losses on Financing Receivables [Table Text Block]	For further detail of our MPF Risk Sharing Structure see page F-16 in our 2017 Form 10-K. There has been no material activity in our allowance for credit losses since December 31, 2017 . The following table presents the recorded investment and the allowance for credit losses in conventional MPF Loans by impairment methodology. As of September 30, 2018 December 31, 2017 Recorded investment - Individually evaluated for impairment $ 38 $ 49 Collectively evaluated for impairment 5,473 4,167 Recorded investment $ 5,511 $ 4,216 Allowance for credit losses - Collectively evaluated for impairment $ 1 $ 2
Past Due Financing Receivables [Table Text Block]	The following table summarizes our recorded investment in MPF Loans by our key credit quality indicators, which include: • "Serious delinquency rate" consists of MPF Loans that are 90 days or more past due or in the process of foreclosure, as a percentage of the total recorded investment. MPF Loans that are both 90 days or more past due and in the process of foreclosure are only included once in our serious delinquency rate calculation. • "Past due 90 days or more still accruing interest" consists of MPF Loans that are either insured or guaranteed by the government 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 primary mortgage insurance, of a financially responsible party) and in the process of collection. We do not recognize interest income on impaired conventional MPF Loans. • Conventional MPF Loans are individually evaluated for impairment when they are adversely classified. There is no allowance for credit losses attributable to conventional MPF Loans that are individually evaluated for impairment, since the related allowance for credit losses has been charged off. September 30, 2018 December 31, 2017 As of Conventional Government Total Conventional Government Total Past due 30-59 days $ 59 $ 37 $ 96 $ 74 $ 48 $ 122 Past due 60-89 days 14 14 28 21 16 37 Past due 90 days or more 35 18 53 48 21 69 Past due 108 69 177 143 85 228 Current 5,403 893 6,296 4,073 921 4,994 Recorded investment $ 5,511 $ 962 $ 6,473 $ 4,216 $ 1,006 $ 5,222 In process of foreclosure $ 16 $ 6 $ 22 $ 21 $ 7 $ 28 Serious delinquency rate 0.66 % 1.87 % 0.84 % 1.16 % 2.11 % 1.34 % Past due 90 days or more and still accruing interest $ 5 $ 18 $ 23 $ 8 $ 21 $ 29 Impaired loans without an allowance for credit losses and on nonaccrual status 38 — 38 49 — 49 Unpaid principal balance of impaired loans without an allowance for credit losses 41 — 41 53 — 53

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	9 Months Ended
Derivatives and Hedging Activities (Tables)	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following table presents details on the notional amounts, and cleared and bilateral derivative assets and liabilities on our statements of condition. To conform with our current presentation method, we reclassified variation margin for cleared derivatives as of December 31, 2017, in the amounts of $16 million on our derivative assets and $168 million on our derivative liabilities, to the appropriate interest rate contracts line items. 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, by contract (e.g., master netting agreement) or otherwise, to offset cash flow obligations between us and our counterparty into a single net payable or receivable. September 30, 2018 December 31, 2017 As of Notional Amount Derivative Assets Derivative Liabilities Notional Amount Derivative Assets Derivative Liabilities Derivatives in hedge accounting relationships- Interest rate contracts $ 31,281 $ 60 $ 338 $ 26,655 $ 25 $ 367 Derivatives not in hedge accounting relationships- Interest rate contracts 20,696 110 81 20,506 199 122 Other 811 1 1 810 1 1 Derivatives not in hedge accounting relationships 21,507 111 82 21,316 200 123 Gross derivative amount before netting adjustments and cash collateral $ 52,788 171 420 $ 47,971 225 490 Netting adjustments and cash collateral (160 ) (395 ) (222 ) (470 ) Derivatives on statements of condition $ 11 $ 25 $ 3 $ 20 Cash collateral received on derivative assets $ 45 $ 35 Cash collateral posted on derivative liabilities $ 281 $ 284
Derivatives And Hedging Activities as Presented in the Statements of Income [Table Text Block]	The following table presents the noninterest income on derivatives and hedging activities as presented in the statements of income. The amounts attributable to fair value and cash flow hedges represent hedge ineffectiveness. Three months ended September 30, Nine months ended September 30, For the periods ending 2018 2017 2018 2017 Fair value hedges - interest rate contracts $ (6 ) $ (3 ) $ (6 ) $ (3 ) Cash flow hedges - interest rate contracts — 1 1 2 Economic hedges - Interest rate contracts 2 2 1 3 Other (1 ) — (2 ) 3 Economic hedges 1 2 (1 ) 6 Variation margin on daily settled cleared derivatives — — 1 1 Noninterest income on derivatives and hedging activities $ (5 ) $ — $ (5 ) $ 6
Offsetting Assets [Table Text Block]	The following table presents details regarding the offsetting of our derivative assets and liabilities on our statements of condition. 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, by contract (e.g., master netting agreement) or otherwise, to offset cash flow obligations between us and our counterparty into a single net payable or receivable. Derivative Assets Derivative Liabilities Bilateral Cleared Total Bilateral Cleared Total As of September 30, 2018 Derivatives with legal right of offset - Gross recognized amount $ 148 $ 23 $ 171 $ 381 $ 38 $ 419 Netting adjustments and cash collateral (138 ) (22 ) (160 ) (374 ) (21 ) (395 ) Derivatives with legal right of offset - net 10 1 11 7 17 24 Derivatives without legal right of offset — — — 1 — 1 Derivatives on statements of condition 10 1 11 8 17 25 Less: Noncash collateral received or pledged and cannot be sold or repledged — — — — 17 17 Net amount $ 10 $ 1 $ 11 $ 8 $ — $ 8 As of December 31, 2017 Derivatives with legal right of offset - Gross recognized amount $ 216 $ 8 $ 224 $ 476 $ 13 $ 489 Netting adjustments and cash collateral (214 ) (8 ) (222 ) (463 ) (7 ) (470 ) Derivatives with legal right of offset - net 2 — 2 13 6 19 Derivatives without legal right of offset 1 — 1 1 — 1 Derivatives on statements of condition 3 — 3 14 6 20 Less: Noncash collateral received or pledged and cannot be sold or repledged — (1 ) (1 ) — 6 6 Net amount $ 3 $ 1 $ 4 $ 14 $ — $ 14
Offsetting Liabilities [Table Text Block]	The following table presents details regarding the offsetting of our derivative assets and liabilities on our statements of condition. 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, by contract (e.g., master netting agreement) or otherwise, to offset cash flow obligations between us and our counterparty into a single net payable or receivable. Derivative Assets Derivative Liabilities Bilateral Cleared Total Bilateral Cleared Total As of September 30, 2018 Derivatives with legal right of offset - Gross recognized amount $ 148 $ 23 $ 171 $ 381 $ 38 $ 419 Netting adjustments and cash collateral (138 ) (22 ) (160 ) (374 ) (21 ) (395 ) Derivatives with legal right of offset - net 10 1 11 7 17 24 Derivatives without legal right of offset — — — 1 — 1 Derivatives on statements of condition 10 1 11 8 17 25 Less: Noncash collateral received or pledged and cannot be sold or repledged — — — — 17 17 Net amount $ 10 $ 1 $ 11 $ 8 $ — $ 8 As of December 31, 2017 Derivatives with legal right of offset - Gross recognized amount $ 216 $ 8 $ 224 $ 476 $ 13 $ 489 Netting adjustments and cash collateral (214 ) (8 ) (222 ) (463 ) (7 ) (470 ) Derivatives with legal right of offset - net 2 — 2 13 6 19 Derivatives without legal right of offset 1 — 1 1 — 1 Derivatives on statements of condition 3 — 3 14 6 20 Less: Noncash collateral received or pledged and cannot be sold or repledged — (1 ) (1 ) — 6 6 Net amount $ 3 $ 1 $ 4 $ 14 $ — $ 14 At September 30, 2018 , we had $160 million of additional credit exposure on cleared derivatives due to pledging of noncash collateral to our DCOs for initial margin, which exceeded our derivative position. We had $60 million of comparable exposure at December 31, 2017 .
Fair Value Hedges [Table Text Block]	The following table presents our fair value hedging results by the type of hedged item. We had no gain (loss) for hedges that no longer qualified as a fair value hedge. Additionally, the table indicates where fair value hedging results are classified in our statements of income. In this regard, the Amount Recorded in Net Interest Income column includes the following: • The amortization of closed fair value hedging adjustments, which are included in the interest income/expense line item of the respective hedged item type. • The effect of net interest settlements attributable to open derivative hedging instruments, which are recorded directly to the interest income/expense line item of the respective hedged item type. Gain (Loss) on Hedging Instrument Gain (Loss) on Hedged Item Total Ineffectiveness Recognized in Derivatives and Hedging Activities Amount Recorded in Net Interest Income Three months ended September 30, 2018 Available-for-sale debt securities $ 46 $ (50 ) $ (4 ) $ (14 ) Advances 43 (47 ) (4 ) 6 MPF Loans held for portfolio — — — (1 ) Consolidated obligation bonds (17 ) 19 2 (18 ) Total $ 72 $ (78 ) $ (6 ) $ (27 ) Three months ended September 30, 2017 Available-for-sale debt securities $ 23 $ (26 ) $ (3 ) $ (21 ) Advances 9 (9 ) — (8 ) MPF Loans held for portfolio — — — (2 ) Consolidated obligation bonds (4 ) 4 — 7 Total $ 28 $ (31 ) $ (3 ) $ (24 ) Nine months ended September 30, 2018 Available-for-sale debt securities $ 95 $ (101 ) $ (6 ) $ (44 ) Advances 150 (148 ) 2 9 MPF Loans held for portfolio — — — (3 ) Consolidated obligation bonds (166 ) 164 (2 ) (34 ) Total $ 79 $ (85 ) $ (6 ) $ (72 ) Nine months ended September 30, 2017 Available-for-sale debt securities $ 58 $ (64 ) $ (6 ) $ (70 ) Advances (6 ) 9 3 (27 ) MPF Loans held for portfolio — — — (5 ) Consolidated obligation bonds 55 (55 ) — 29 Total $ 107 $ (110 ) $ (3 ) $ (73 )
Cash Flow Hedges [Table Text Block]	The following table presents our cash flow hedging results by type of hedged item. Additionally, the table indicates where cash flow hedging results are classified in our statements of income. In this regard, the Amount Recorded in Net Interest Income column includes the following: • The amortization of closed cash flow hedging adjustments, which are reclassified from AOCI into the interest income/expense line item of the respective hedged item type. • The effect of net interest settlements attributable to open derivative hedging instruments, which are recorded directly to the interest income/expense line item of the respective hedged item type. Ineffectiveness Recorded in Derivatives and Hedging Activities Effective Portion Recorded in AOCI Amount Recorded in Net Interest Income Three months ended September 30, 2018 Discount notes $ — $ 15 $ (22 ) Three months ended September 30, 2017 Advances $ — $ — $ 1 Discount notes 1 44 (40 ) Total $ 1 $ 44 $ (39 ) Nine months ended September 30, 2018 Advances $ — $ — $ 1 Discount notes 1 103 (86 ) Bonds — — (1 ) Total $ 1 $ 103 $ (86 ) Nine months ended September 30, 2017 Advances $ — $ — $ 7 Discount notes 2 117 (128 ) Bonds — — (2 ) Total $ 2 $ 117 $ (123 )

Consolidated Obligations (Table

Consolidated Obligations (Tables)	9 Months Ended
Consolidated Obligations (Tables)	Sep. 30, 2018
Debt Disclosure [Abstract]
Schedule of Short-term Debt [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 September 30, 2018 December 31, 2017 Carrying Amount $ 37,674 $ 41,191 Weighted Average Interest Rate 1.98 % 1.23 %
Schedule of Maturities of Long-term Debt [Table Text Block]	The following table presents our consolidated obligation bonds, for which we are the primary obligor, including callable bonds that are redeemable in whole, or in part, at our discretion on predetermined call dates. As of September 30, 2018 Contractual Maturity Weighted Average Interest Rate By Maturity or Next Call Date Due in one year or less $ 24,310 1.88 % $ 35,432 One to two years 7,011 1.82 % 6,503 Two to three years 4,714 2.16 % 1,867 Three to four years 4,152 2.23 % 1,268 Four to five years 2,061 2.94 % 983 Thereafter 4,369 3.03 % 564 Total par value $ 46,617 2.08 % $ 46,617
Schedule of Long-term Debt Instruments [Table Text Block]	The following table presents consolidated obligation bonds outstanding by call feature: As of September 30, 2018 December 31, 2017 Noncallable $ 33,202 $ 23,644 Callable 13,415 13,703 Par value 46,617 37,347 Fair value hedging adjustments (373 ) (214 ) Other adjustments (12 ) (12 ) Consolidated obligation bonds $ 46,232 $ 37,121
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. We did not accrue a liability for our joint and several liability related to the other FHLBs’ share of the consolidated obligations as of September 30, 2018 , and December 31, 2017 . See Note 17 - Commitments and Contingencies in our 2017 Form 10-K for further details. September 30, 2018 December 31, 2017 Par values as of Bonds Discount Notes Total Bonds Discount Notes Total FHLB System total consolidated obligations $ 615,216 $ 403,882 $ 1,019,098 $ 642,211 $ 392,049 $ 1,034,260 FHLB Chicago as primary obligor 46,617 37,741 84,358 37,347 41,235 78,582 As a percent of the FHLB System 8 % 9 % 8 % 6 % 11 % 8 %

Capital and Mandatorily Redee_2

Capital and Mandatorily Redeemable Capital Stock (MRCS) (Tables)	9 Months Ended
	Sep. 30, 2018
Federal Home Loan Banks [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	For details on our minimum capital requirements, including how the ratios below were calculated, see Minimum Capital Requirements on page F-44 of our 2017 Form 10-K. We complied with our minimum regulatory capital requirements as shown below. September 30, 2018 December 31, 2017 Requirement Actual Requirement Actual Risk-based capital $ 1,219 $ 5,519 $ 1,075 $ 5,051 Total regulatory capital $ 3,656 $ 5,519 $ 3,374 $ 5,051 Total regulatory capital ratio 4.00 % 6.04 % 4.00 % 5.99 % Leverage capital $ 4,571 $ 8,278 $ 4,218 $ 7,577 Leverage capital ratio 5.00 % 9.06 % 5.00 % 8.98 % Total regulatory capital and leverage capital includes mandatorily redeemable capital stock (MRCS) but does not include AOCI. Under the FHFA regulation on capital classifications and critical capital levels for the FHLBs, we are adequately capitalized.
Stockholders' Equity, Total [Member]
Concentration Risk [Line Items]
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	The following members had regulatory capital stock exceeding 10% of our total regulatory capital stock outstanding (which includes MRCS): As of September 30, 2018 Regulatory Capital Stock Outstanding % of Total Outstanding Amount of Which is Classified as a Liability (MRCS) BMO Harris Bank, NA $ 314 15.5 % $ — The Northern Trust Company 247 12.2 % — One Mortgage Partners Corp. 245 a 12.1 % 245 a One Mortgage Partners Corp. is a subsidiary of JPMorgan Chase Bank NA.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
Accumulated Other Comprehensive Income (Loss) (Tables)	Sep. 30, 2018
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes the gains (losses) in AOCI for the reporting periods indicated. Net Unrealized - Non-credit OTTI - Net Unrealized - Cash Flow Hedges Available-for-sale Securities Held-to-maturity Securities Post-Retirement Plans AOCI Three months ended September 30, 2018 Beginning balance $ 315 $ (128 ) $ (57 ) $ (8 ) $ 122 Change in the period recorded to the statements of condition, before reclassifications to statements of income (32 ) 7 15 (5 ) (15 ) Amounts reclassified in period to statements of income: Net interest income — — 10 10 Noninterest expense 1 1 Ending balance $ 283 $ (121 ) $ (32 ) $ (12 ) $ 118 Three months ended September 30, 2017 Beginning balance $ 478 $ (160 ) $ (243 ) $ (8 ) $ 67 Change in the period recorded to the statements of condition, before reclassifications to statements of income (24 ) 8 44 3 31 Amounts reclassified in period to statements of income: Net interest income — — (1 ) (1 ) Noninterest gain (loss) — — (1 ) (1 ) Ending balance $ 454 $ (152 ) $ (201 ) $ (5 ) $ 96 Nine months ended September 30, 2018 Beginning balance $ 407 $ (143 ) $ (147 ) $ (5 ) $ 112 Change in the period recorded to the statements of condition, before reclassifications to statements of income (124 ) 22 103 (8 ) (7 ) Amounts reclassified in period to statements of income: Net interest income — — 13 13 Noninterest gain (loss) — — (1 ) (1 ) Noninterest expense 1 1 Ending balance $ 283 $ (121 ) $ (32 ) $ (12 ) $ 118 Nine months ended September 30, 2017 Beginning balance $ 459 $ (177 ) $ (312 ) $ (6 ) $ (36 ) Change in the period recorded to the statements of condition, before reclassifications to statements of income (5 ) 25 117 1 138 Amounts reclassified in period to statements of income: Net interest income — — (4 ) (4 ) Noninterest gain (loss) — — (2 ) (2 ) Ending balance $ 454 $ (152 ) $ (201 ) $ (5 ) $ 96

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
Fair Value (Tables)	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement [Table Text Block]	The following table is a summary of the fair value estimates and related levels in the hierarchy. The carrying amounts are per the statements of condition. Fair value estimates represent the exit prices that we would receive to sell assets or pay to transfer liabilities in an orderly transaction with market participants at the measurement date. They do not represent an estimate of our overall market value as a going concern, as they do not take into account future business opportunities or profitability of assets and liabilities. We measure instrument-specific credit risk attributable to our consolidated obligations based on our nonperformance risk, which includes the credit risk associated with the joint and several liability of other FHLBs. As a result, we did not recognize any instrument-specific credit risk attributable to our consolidated obligations that are carried at fair value. See Note 2 - Summary of Significant Accounting Policies in our 2017 Form 10-K for our fair value policies and Note 16 - Fair Value in our 2017 Form 10-K for our valuation techniques and significant inputs. See Note 9 - Derivatives and Hedging Activities for more information on the Netting and Cash Collateral amounts. Carrying Amount Fair Value Level 1 Level 2 Level 3 Netting & Cash Collateral September 30, 2018 Carried at amortized cost Cash and due from banks $ 44 $ 44 $ 44 $ — $ — Interest bearing deposits 775 775 775 — — Federal Funds sold and securities purchased under agreements to resell 9,835 9,835 — 9,835 — Held-to-maturity debt securities 2,928 3,217 — 2,549 668 Advances 53,759 53,784 — 53,784 — MPF Loans held in portfolio, net 6,433 6,396 — 6,387 9 Other assets 169 169 — 169 — Carried at fair value on a recurring basis Trading securities 2,596 2,596 — 2,596 — Government related non-MBS, ABS, and MBS 13,663 13,663 — 13,663 — Private label residential MBS 44 44 — — 44 Available-for-sale debt securities 13,707 13,707 — 13,663 44 Advances - fair value option election 908 908 — 908 — Derivative assets 11 11 1 170 — $ (160 ) Other assets - fair value option election 116 116 — 116 — Carried at fair value on a nonrecurring basis MPF Loans held in portfolio, net 6 6 — — 6 Other assets 1 1 — — 1 Financial assets 91,288 $ 91,565 $ 820 $ 90,177 $ 728 $ (160 ) Other non financial assets 122 Assets $ 91,410 Carried at amortized cost Deposits $ (581 ) $ (581 ) $ — $ (581 ) $ — Consolidated obligation discount notes (37,674 ) (37,667 ) — (37,667 ) — Consolidated obligation bonds (44,030 ) (43,996 ) — (43,996 ) — Mandatorily redeemable capital stock (313 ) (313 ) (313 ) — — Other liabilities (154 ) (154 ) — (154 ) — Carried at fair value on a recurring basis Consolidated obligation bonds - fair value option (2,202 ) (2,202 ) — (2,202 ) — Derivative liabilities (25 ) (25 ) — (420 ) — $ 395 Financial liabilities (84,979 ) $ (84,938 ) $ (313 ) $ (85,020 ) $ — $ 395 Other non financial liabilities (1,107 ) Liabilities $ (86,086 ) Carrying Amount Fair Value Level 1 Level 2 Level 3 Netting December 31, 2017 Carried at amortized cost Cash and due from banks $ 42 $ 42 $ 42 $ — $ — Interest bearing deposits 775 775 775 — — Federal Funds sold and securities purchased under agreements to resell 12,561 12,561 — 12,561 — Held-to-maturity debt securities 4,157 4,538 — 3,734 804 Advances 47,309 47,336 — 47,336 — MPF Loans held in portfolio, net 5,186 5,306 — 5,295 11 Other assets 119 119 — 119 — Carried at fair value on a recurring basis Trading securities 233 233 — 233 — Government related non-MBS, ABS, and MBS 12,907 12,907 — 12,907 — Private label residential MBS 50 50 — — 50 Available-for-sale debt securities 12,957 12,957 — 12,907 50 Advances - fair value option election 776 776 — 776 — Derivative assets 3 3 — 225 — $ (222 ) Other assets - fair value option election 118 118 — 118 — Carried at fair value on a nonrecurring basis MPF Loans held in portfolio, net 7 7 — — 7 Other assets 3 3 — — 3 Financial assets 84,246 $ 84,774 $ 817 $ 83,304 $ 875 $ (222 ) Other non financial assets 109 Assets $ 84,355 Carried at amortized cost Deposits (524 ) (524 ) — (524 ) — Consolidated obligation discount notes (40,442 ) (40,437 ) — (40,437 ) — Consolidated obligation bonds (31,861 ) (32,011 ) — (32,011 ) — Mandatorily redeemable capital stock (311 ) (311 ) (311 ) — — Other liabilities (94 ) (94 ) — (94 ) — Carried at fair value on a recurring basis Consolidated obligation discount notes - fair value option (749 ) (749 ) — (749 ) — Consolidated obligation bonds - fair value option (5,260 ) (5,260 ) — (5,260 ) — Derivative liabilities (20 ) (20 ) — (490 ) — 470 Financial liabilities (79,261 ) $ (79,406 ) $ (311 ) $ (79,565 ) $ — $ 470 Other non financial liabilities (242 ) Liabilities $ (79,503 ) We had no
Fair Value Option, Disclosures [Table Text Block]	The following table presents the changes in fair values of financial assets and liabilities carried at fair value under the fair value option. These changes were recognized in noninterest income - instruments held under the fair value option in our statements of income. Three months ended September 30, Nine months ended September 30, 2018 2017 2018 2017 Advances $ (1 ) $ (1 ) $ (11 ) $ 2 Discount notes — (1 ) — (1 ) Consolidated obligation bonds (1 ) (3 ) (3 ) (3 ) Other assets (1 ) — (6 ) (1 ) Noninterest income - Instruments held under fair value option $ (3 ) $ (5 ) $ (20 ) $ (3 ) The following table reflects the difference between the aggregate unpaid principal balance (UPB) outstanding and the aggregate fair value for our long term financial instruments for which the fair value option has been elected. None of the advances were 90 days or more past due and none were on nonaccrual status. September 30, 2018 December 31, 2017 As of Advances Consolidated Obligation Bonds Advances Consolidated Obligation Bonds Unpaid principal balance $ 929 $ 2,213 $ 786 $ 5,270 Fair value over (under) UPB (21 ) (11 ) (10 ) (10 ) Fair value $ 908 $ 2,202 $ 776 $ 5,260

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
Commitments and Contingencies (Tables)	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Off-Balance Sheet Commitments [Table Text Block]	The following table shows our commitments outstanding, which represent off-balance sheet obligations. September 30, 2018 December 31, 2017 As of Expire within one year Expire after one year Total Expire within one year Expire after one year Total Unsettled consolidated obligation bonds $ 25 $ — $ 25 $ — $ — $ — Member standby letters of credit 18,407 4,308 a 22,715 15,703 3,869 a 19,572 Housing authority standby bond purchase agreements 71 295 366 — 337 337 Advance commitments 1,647 3 1,650 151 — 151 MPF delivery commitments 433 — 433 371 — 371 Other 3 — 3 14 — 14 Commitments $ 20,586 $ 4,606 $ 25,192 $ 16,239 $ 4,206 $ 20,445 a Contains $1.6 billion and $750 million of member standby letters of credit as of September 30, 2018 , and December 31, 2017 , which were renewable annually. For a description of defined terms see Note 17 - Commitments and Contingencies to the financial statements in our 2017

Transactions with Related Par_2

Transactions with Related Parties and Other FHLBs (Tables)	9 Months Ended
Transactions with Related Parties and Other FHLBs (Tables)	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions, by Balance Sheet Grouping [Table Text Block]	The following table summarizes material balances we had with our members who are related parties as defined above (including their affiliates) as of the periods presented. The related impacts to our Statements of Income were no t material. As of September 30, 2018 December 31, 2017 Assets - Advances $ 629 $ 165 Liabilities - Deposits 6 13 Equity - Capital Stock 27 10

Interest Income and Interest _3

Interest Income and Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income -
Trading	$ 8	$ 1	$ 23	$ 3
Available-for-sale interest income	107	106	318	321
Available-for-sale prepayment fees	7	9	27	20
Available-for-sale	114	115	345	341
Held-to-maturity	46	47	135	148
Investment debt securities	168	163	503	492
Advances	312	157	811	386
MPF Loans held in portfolio	62	53	177	160
Federal funds sold and securities purchased under agreements to resell	54	34	152	74
Other	7	4	17	9
Interest income	603	411	1,660	1,121
Consolidated obligations -
Discount notes	208	148	596	363
Bonds	263	136	665	394
Other	6	4	17	11
Interest expense	477	288	1,278	768
Net interest income	126	123	382	353
Provision for (reversal of) credit losses	(1)	(1)	(1)	0
Net interest income after provision for (reversal of) credit losses	$ 127	$ 124	$ 383	$ 353

Investment Debt Securities (Tra

Investment Debt Securities (Trading debt scurities) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Debt and Equity Securities, FV-NI [Line Items]
Debt Securities, Trading, Unrealized Gain (Loss)	$ 8
Trading debt securities	2,596	$ 233
U.S. Government & other government related
Debt and Equity Securities, FV-NI [Line Items]
Trading debt securities	2,574	202
Residential MBS \| GSE
Debt and Equity Securities, FV-NI [Line Items]
Trading debt securities	21	30
Residential MBS \| Government guaranteed
Debt and Equity Securities, FV-NI [Line Items]
Trading debt securities	$ 1	$ 1

Investment Debt Securities (Ava

Investment Debt Securities (Available-for-sale debt securities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 13,424	$ 12,550
Gross Unrealized Gains in AOCI	288	415
Gross Unrealized (Losses) in AOCI	(5)	(8)
Carrying Amount and Fair Value	13,707	12,957
U.S. Government & other government related
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	440	256
Gross Unrealized Gains in AOCI	8	15
Gross Unrealized (Losses) in AOCI	(1)	0
Carrying Amount and Fair Value	447	271
State or local housing agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	16	21
Gross Unrealized Gains in AOCI	0	0
Gross Unrealized (Losses) in AOCI	0	0
Carrying Amount and Fair Value	16	21
FFELP ABS \| FFELP ABS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	3,680	3,987
Gross Unrealized Gains in AOCI	220	234
Gross Unrealized (Losses) in AOCI	0	(7)
Carrying Amount and Fair Value	3,900	4,214
Residential MBS \| GSE
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	8,520	7,275
Gross Unrealized Gains in AOCI	38	132
Gross Unrealized (Losses) in AOCI	(4)	(1)
Carrying Amount and Fair Value	8,554	7,406
Residential MBS \| Government guaranteed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	732	971
Gross Unrealized Gains in AOCI	14	24
Gross Unrealized (Losses) in AOCI	0	0
Carrying Amount and Fair Value	746	995
Residential MBS \| Private label
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	36	40
Gross Unrealized Gains in AOCI	8	10
Gross Unrealized (Losses) in AOCI	0	0
Carrying Amount and Fair Value	$ 44	$ 50

Investment Debt Securities (Hel

Investment Debt Securities (Held-to-maturities debt securities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost Basis	$ 3,049	$ 4,300
Non-credit OTTI Recognized in AOCI (Loss)	(121)	(143)
Carrying Amount	2,928	4,157
Gross Unrecognized Holding Gains	291	382
Gross Unrecognized Holding (Losses)	(2)	(1)
fair value	3,217	4,538
U.S. Government & other government related
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost Basis	880	1,531
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Carrying Amount	880	1,531
Gross Unrecognized Holding Gains	7	29
Gross Unrecognized Holding (Losses)	(2)	(1)
fair value	885	1,559
State or local housing agency
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost Basis	7	9
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Carrying Amount	7	9
Gross Unrecognized Holding Gains	0	0
Gross Unrecognized Holding (Losses)	0	0
fair value	7	9
Residential MBS \| GSE
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost Basis	1,201	1,513
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Carrying Amount	1,201	1,513
Gross Unrecognized Holding Gains	28	62
Gross Unrecognized Holding (Losses)	0	0
fair value	1,229	1,575
Residential MBS \| Government guaranteed
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost Basis	425	585
Non-credit OTTI Recognized in AOCI (Loss)	0	0
Carrying Amount	425	585
Gross Unrecognized Holding Gains	3	6
Gross Unrecognized Holding (Losses)	0	0
fair value	428	591
Residential MBS \| Private label
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost Basis	536	662
Non-credit OTTI Recognized in AOCI (Loss)	(121)	(143)
Carrying Amount	415	519
Gross Unrecognized Holding Gains	253	285
Gross Unrecognized Holding (Losses)	0	0
fair value	$ 668	$ 804

Investment Debt Securities Cont

Investment Debt Securities Contractual maturities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Due in one year or less	$ 3
Due after one year through five years	2
Due after five years through ten years	163
Due after ten years	288
ABS and MBS without a single maturity date	12,968
Amortized Cost Basis	13,424	$ 12,550
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Due in one year or less	3
Due after one year through five years	2
Due after five years through ten years	163
Due after ten years	295
ABS and MBS without a single maturity date	13,244
Carrying Amount and Fair Value	13,707	12,957
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Due in one year or less	178
Due after one year through five years	93
Due after five years through ten years	109
Due after ten years	507
ABS and MBS without a single maturity date	2,041
Carrying Amount	2,928	4,157
Debt Securities, Held-to-maturity, Maturity, Fair Value, Rolling Maturity [Abstract]
Due in one year or less	177
Due after one year through five years	94
Due after five years through ten years	109
Due after ten years	512
ABS and MBS without a single maturity date	2,325
Fair Value	$ 3,217	$ 4,538

Investment Debt Securities Agin

Investment Debt Securities Aging of unrealized temporary losses (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale debt securities
Available-for-sale debt securities
Less than 12 Months, Fair Value	$ 1,882	$ 58
Less than 12 Months, Gross Unrealized (Losses)	(4)	0
12 Months or More, Fair Value	1,207	1,452
12 Months or More, Gross Unrealized (Losses)	(1)	(8)
Total, Fair Value	3,089	1,510
Total, Gross Unrealized (Losses)	(5)	(8)
Available-for-sale debt securities \| U.S. Government & other government related
Available-for-sale debt securities
Less than 12 Months, Fair Value	239	3
Less than 12 Months, Gross Unrealized (Losses)	(1)	0
12 Months or More, Fair Value	0	0
12 Months or More, Gross Unrealized (Losses)	0	0
Total, Fair Value	239	3
Total, Gross Unrealized (Losses)	(1)	0
Available-for-sale debt securities \| State or local housing agency
Available-for-sale debt securities
Less than 12 Months, Fair Value	9	4
Less than 12 Months, Gross Unrealized (Losses)	0	0
12 Months or More, Fair Value	0	0
12 Months or More, Gross Unrealized (Losses)	0	0
Total, Fair Value	9	4
Total, Gross Unrealized (Losses)	0	0
Available-for-sale debt securities \| FFELP ABS \| FFELP ABS
Available-for-sale debt securities
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Gross Unrealized (Losses)	0	0
12 Months or More, Fair Value	597	644
12 Months or More, Gross Unrealized (Losses)	0	(7)
Total, Fair Value	597	644
Total, Gross Unrealized (Losses)	0	(7)
Available-for-sale debt securities \| Residential MBS \| GSE
Available-for-sale debt securities
Less than 12 Months, Fair Value	1,634	51
Less than 12 Months, Gross Unrealized (Losses)	(3)	0
12 Months or More, Fair Value	604	801
12 Months or More, Gross Unrealized (Losses)	(1)	(1)
Total, Fair Value	2,238	852
Total, Gross Unrealized (Losses)	(4)	(1)
Available-for-sale debt securities \| Residential MBS \| Private label
Available-for-sale debt securities
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Gross Unrealized (Losses)	0	0
12 Months or More, Fair Value	6	7
12 Months or More, Gross Unrealized (Losses)	0	0
Total, Fair Value	6	7
Total, Gross Unrealized (Losses)	0	0
Held-to-maturity debt securities
Held-to-maturity debt securities
Less than 12 Months, Fair Value	524	596
Less than 12 Months, Gross Unrealized (Losses)	(1)	0
12 Months or More, Fair Value	656	795
12 Months or More, Gross Unrealized (Losses)	(122)	(144)
Total, Fair Value	1,180	1,391
Total, Gross Unrealized (Losses)	(123)	(144)
Held-to-maturity debt securities \| U.S. Government & other government related
Held-to-maturity debt securities
Less than 12 Months, Fair Value	145	594
Less than 12 Months, Gross Unrealized (Losses)	(1)	0
12 Months or More, Fair Value	19	24
12 Months or More, Gross Unrealized (Losses)	(1)	(1)
Total, Fair Value	164	618
Total, Gross Unrealized (Losses)	(2)	(1)
Held-to-maturity debt securities \| State or local housing agency
Held-to-maturity debt securities
Less than 12 Months, Fair Value	3	2
Less than 12 Months, Gross Unrealized (Losses)	0	0
12 Months or More, Fair Value	0	0
12 Months or More, Gross Unrealized (Losses)	0	0
Total, Fair Value	3	2
Total, Gross Unrealized (Losses)	0	0
Held-to-maturity debt securities \| Residential MBS \| GSE
Held-to-maturity debt securities
Less than 12 Months, Fair Value	197	0
Less than 12 Months, Gross Unrealized (Losses)	0	0
12 Months or More, Fair Value	0	2
12 Months or More, Gross Unrealized (Losses)	0	0
Total, Fair Value	197	2
Total, Gross Unrealized (Losses)	0	0
Held-to-maturity debt securities \| Residential MBS \| Government guaranteed
Held-to-maturity debt securities
Less than 12 Months, Fair Value	179
Less than 12 Months, Gross Unrealized (Losses)	0
12 Months or More, Fair Value	0
12 Months or More, Gross Unrealized (Losses)	0
Total, Fair Value	179
Total, Gross Unrealized (Losses)	0
Held-to-maturity debt securities \| Residential MBS \| Private label
Held-to-maturity debt securities
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Gross Unrealized (Losses)	0	0
12 Months or More, Fair Value	637	769
12 Months or More, Gross Unrealized (Losses)	(121)	(143)
Total, Fair Value	637	769
Total, Gross Unrealized (Losses)	$ (121)	$ (143)

Investment Debt Securities (Sig

Investment Debt Securities (Significant Inputs Used to Determine OTTI) (Details)	Sep. 30, 2018
Minimum
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Assumed Home Price Change Rate all markets over 12 months	(10.00%)
Projected House Price Change Rate majority of markets over 12 months	3.00%
Maximum
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Assumed Home Price Change Rate all markets over 12 months	15.00%
Projected House Price Change Rate majority of markets over 12 months	7.00%

Investment Debt Securities (OTT

Investment Debt Securities (OTTI rollforward) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Beginning Balance	$ 459	$ 499	$ 477	$ 520
Reductions:
Increases in cash flows expected to be collected and recognized into interest income	(8)	(10)	(26)	(31)
Ending Balance	$ 451	$ 489	$ 451	$ 489

Advances By redemption terms (D

Advances By redemption terms (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances, Maturity, Rolling Year, Par Value Amount [Abstract]
Due in one year or less	$ 23,638
One to two years	2,556
Two to three years	2,651
Three to four years	1,910
Four to five years	8,175
More than five years	15,833
Par value	$ 54,763	$ 48,020
Federal Home Loan Bank, Advances, Weighted Average Contractual Interest Rate, Rolling Year [Abstract]
Due in one year or less	2.19%
One to two years	2.05%
Two to three years	2.19%
Three to four years	2.32%
Four to five years	2.42%
More than five years	2.28%
Par value	2.25%

Advances Reconciliation of par

Advances Reconciliation of par values to carrying values (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Federal Home Loan Banks [Abstract]
Par value	$ 54,763	$ 48,020
Fair value hedging adjustments	(79)	69
Other adjustments	(17)	(4)
Advances	$ 54,667	$ 48,085

Advances By counterparty concen

Advances By counterparty concentration (Details) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Par value		$ 54,763	$ 48,020
Credit Concentration Risk \| One Mortgage Partners Corp. [Member]
Concentration Risk [Line Items]
Par value	[1]	$ 11,000
% of Total Outstanding		20.10%
Credit Concentration Risk \| The Northern Trust Company [Member]
Concentration Risk [Line Items]
Par value		$ 7,700
% of Total Outstanding		14.10%
Credit Concentration Risk \| BMO Harris Bank, N.A. [Member]
Concentration Risk [Line Items]
Par value		$ 6,975
% of Total Outstanding		12.70%

[1]	One Mortgage Partners Corp. is a subsidiary of JPMorgan Chase Bank NA.

MPF Loans Held in Portfolio (De

MPF Loans Held in Portfolio (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance	$ 6,344	$ 5,120
Net premiums, credit enhancement, and/or deferred loan fees	86	55
Fair value hedging adjustments	10	20
MPF Loans held in portfolio, before allowance for credit losses	6,440	5,195
Allowance for credit losses on MPF Loans	(1)	(2)
MPF Loans held in portfolio, net	6,439	5,193
Medium term (15 years or less)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance	318	285
Long term (greater than 15 years)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance	6,026	4,835
Conventional mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance	5,402	4,133
Government Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance	$ 942	$ 987

Allowance for Credit Losses Rec

Allowance for Credit Losses Recorded Investment and Allowance on Conventional MPF Loans Held in Portfolio (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Recorded investment -
Recorded investment	$ 6,473	$ 5,222
Conventional mortgage loans
Recorded investment -
Individually evaluated for impairment	38	49
Collectively evaluated for impairment	5,473	4,167
Recorded investment	5,511	4,216
Allowance for credit losses -
Collectively evaluated for impairment	$ 1	$ 2

Allowance for Credit Losses Cre

Allowance for Credit Losses Credit Quality Indicators - MPF Loans Held in Portfolio (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 177	$ 228
Current	6,296	4,994
Recorded investment	6,473	5,222
In process of foreclosure	$ 22	$ 28
Serious delinquency rate	0.84%	1.34%
Past due 90 days or more and still accruing interest	$ 23	$ 29
Impaired loans without an allowance for credit losses and on nonaccrual status	38	49
Unpaid principal balance of impaired loans without an allowance for credit losses	41	53
Past due 30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	96	122
Past due 60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	28	37
Past due 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	53	69
Conventional
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	108	143
Current	5,403	4,073
Recorded investment	5,511	4,216
In process of foreclosure	$ 16	$ 21
Serious delinquency rate	0.66%	1.16%
Past due 90 days or more and still accruing interest	$ 5	$ 8
Impaired loans without an allowance for credit losses and on nonaccrual status	38	49
Unpaid principal balance of impaired loans without an allowance for credit losses	41	53
Conventional \| Past due 30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	59	74
Conventional \| Past due 60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	14	21
Conventional \| Past due 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	35	48
Government
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	69	85
Current	893	921
Recorded investment	962	1,006
In process of foreclosure	$ 6	$ 7
Serious delinquency rate	1.87%	2.11%
Past due 90 days or more and still accruing interest	$ 18	$ 21
Impaired loans without an allowance for credit losses and on nonaccrual status	0	0
Unpaid principal balance of impaired loans without an allowance for credit losses	0	0
Government \| Past due 30-59 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	37	48
Government \| Past due 60-89 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	14	16
Government \| Past due 90 days or more
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 18	$ 21

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Narrative) (Details) $ in Millions	Sep. 30, 2018USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Additional collateral due to derivatives counterparties if credit rating was lowered one level	$ 0
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty	$ 177

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities Derivatives in statements of condition (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount	$ 52,788	$ 47,971
Derivative assets netting adjustments and cash collateral	(160)	(222)
Derivative assets on statements of condition	11	3
Derivative liabilities netting adjustments and cash collateral	(395)	(470)
Derivative liabilities on statements of condition	25	20
Derivatives in hedge accounting relationships- \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	31,281	26,655
Derivatives not in hedge accounting relationships-
Derivatives, Fair Value [Line Items]
Notional Amount	21,507	21,316
Derivatives not in hedge accounting relationships- \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	20,696	20,506
Derivatives not in hedge accounting relationships- \| Other
Derivatives, Fair Value [Line Items]
Notional Amount	811	810
Derivative Assets
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	171	225
Derivative assets netting adjustments and cash collateral	(160)	(222)
Derivative assets on statements of condition	11	3
Cash collateral received on derivative assets	45	35
Derivative Assets \| Derivatives in hedge accounting relationships- \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	60	25
Derivative Assets \| Derivatives not in hedge accounting relationships-
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	111	200
Derivative Assets \| Derivatives not in hedge accounting relationships- \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	110	199
Derivative Assets \| Derivatives not in hedge accounting relationships- \| Other
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	1	1
Derivative Liabilities
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	420	490
Derivative liabilities netting adjustments and cash collateral	(395)	(470)
Derivative liabilities on statements of condition	25	20
Cash collateral posted on derivative liabilities	281	284
Derivative Liabilities \| Derivatives in hedge accounting relationships- \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	338	367
Derivative Liabilities \| Derivatives not in hedge accounting relationships-
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	82	123
Derivative Liabilities \| Derivatives not in hedge accounting relationships- \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	81	122
Derivative Liabilities \| Derivatives not in hedge accounting relationships- \| Other
Derivatives, Fair Value [Line Items]
Gross derivative amount before netting adjustments and cash collateral	$ 1	$ 1

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities Derivatives in statement of income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Economic hedges	$ 1	$ 2	$ (1)	$ 6
Variation margin on daily settled cleared derivatives	0	0	1	1
Noninterest income on derivatives and hedging activities	(5)	0	(5)	6
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Fair value hedges - interest rate contracts	(6)	(3)	(6)	(3)
Cash flow hedges - interest rate contracts	0	1	1	2
Economic hedges	2	2	1	3
Other
Derivative Instruments, Gain (Loss) [Line Items]
Economic hedges	$ (1)	$ 0	$ (2)	$ 3

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities Derivative assets with legal right of offset (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivative assets with legal right of offset -
Gross recognized amount	$ 171	$ 224
Derivative assets netting adjustments and cash collateral	(160)	(222)
Derivatives with legal right of offset - net	11	2
Derivatives without legal right of offset	0	1
Derivative assets on statements of condition	11	3
Less:
Noncash collateral received or pledged and cannot be sold or repledged	0	(1)
Net amount	11	4
Bilateral
Derivative assets with legal right of offset -
Gross recognized amount	148	216
Derivative assets netting adjustments and cash collateral	(138)	(214)
Derivatives with legal right of offset - net	10	2
Derivatives without legal right of offset	0	1
Derivative assets on statements of condition	10	3
Less:
Noncash collateral received or pledged and cannot be sold or repledged	0	0
Net amount	10	3
Cleared
Derivative assets with legal right of offset -
Gross recognized amount	23	8
Derivative assets netting adjustments and cash collateral	(22)	(8)
Derivatives with legal right of offset - net	1	0
Derivatives without legal right of offset	0	0
Derivative assets on statements of condition	1	0
Less:
Noncash collateral received or pledged and cannot be sold or repledged	0	(1)
Net amount	$ 1	$ 1

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities Derivative liabilities with legal right of offset (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivative liabilities with legal right of offset -
Gross recognized amount	$ 419	$ 489
Derivative liabilities netting adjustments and cash collateral	(395)	(470)
Derivatives with legal right of offset - net	24	19
Derivatives without legal right of offset	1	1
Derivative liabilities on statements of condition	25	20
Less:
Noncash collateral received or pledged and cannot be sold or repledged	17	6
Net amount	8	14
Credit exposure on overcollateralized pledged securities exceeding derivative position	160	60
Bilateral
Derivative liabilities with legal right of offset -
Gross recognized amount	381	476
Derivative liabilities netting adjustments and cash collateral	(374)	(463)
Derivatives with legal right of offset - net	7	13
Derivatives without legal right of offset	1	1
Derivative liabilities on statements of condition	8	14
Less:
Noncash collateral received or pledged and cannot be sold or repledged	0	0
Net amount	8	14
Cleared
Derivative liabilities with legal right of offset -
Gross recognized amount	38	13
Derivative liabilities netting adjustments and cash collateral	(21)	(7)
Derivatives with legal right of offset - net	17	6
Derivatives without legal right of offset	0	0
Derivative liabilities on statements of condition	17	6
Less:
Noncash collateral received or pledged and cannot be sold or repledged	17	6
Net amount	$ 0	$ 0

Derivatives and Hedging Activ_8

Derivatives and Hedging Activities (Fair Value Hedges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount Recorded in Net Interest Income	$ 126	$ 123	$ 382	$ 353
Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Hedging Instrument	72	28	79	107
Gain (Loss) on Hedged Item	(78)	(31)	(85)	(110)
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	(6)	(3)	(6)	(3)
Amount Recorded in Net Interest Income	(27)	(24)	(72)	(73)
Fair value hedges \| Available-for-sale debt securities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Hedging Instrument	46	23	95	58
Gain (Loss) on Hedged Item	(50)	(26)	(101)	(64)
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	(4)	(3)	(6)	(6)
Amount Recorded in Net Interest Income	(14)	(21)	(44)	(70)
Fair value hedges \| Advances
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Hedging Instrument	43	9	150	(6)
Gain (Loss) on Hedged Item	(47)	(9)	(148)	9
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	(4)	0	2	3
Amount Recorded in Net Interest Income	6	(8)	9	(27)
Fair value hedges \| MPF Loans held for portfolio
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Hedging Instrument	0	0	0	0
Gain (Loss) on Hedged Item	0	0	0	0
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	0	0	0	0
Amount Recorded in Net Interest Income	(1)	(2)	(3)	(5)
Fair value hedges \| Consolidated obligation bonds
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Hedging Instrument	(17)	(4)	(166)	55
Gain (Loss) on Hedged Item	19	4	164	(55)
Total Ineffectiveness Recognized in Derivatives and Hedging Activities	2	0	(2)	0
Amount Recorded in Net Interest Income	$ (18)	$ 7	$ (34)	$ 29

Derivatives and Hedging Activ_9

Derivatives and Hedging Activities (Cash Flow Hedges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Maximum Hedging Period For Forecasted Cash Flows	10 years
Cash Flow Hedge Gain (Loss) to be Reclassified Next 12 Months, Net	$ 0		$ 0
Amount Recorded in Net Interest Income	126	$ 123	382	$ 353
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Ineffectiveness Recorded in Derivatives and Hedging Activities		1	1	2
Effective Portion Recorded in AOCI		44	103	117
Amount Recorded in Net Interest Income		(39)	(86)	(123)
Cash flow hedges \| Advances
Derivative Instruments, Gain (Loss) [Line Items]
Ineffectiveness Recorded in Derivatives and Hedging Activities		0	0	0
Effective Portion Recorded in AOCI		0	0	0
Amount Recorded in Net Interest Income		1	1	7
Cash flow hedges \| Discount notes
Derivative Instruments, Gain (Loss) [Line Items]
Ineffectiveness Recorded in Derivatives and Hedging Activities	0	1	1	2
Effective Portion Recorded in AOCI	15	44	103	117
Amount Recorded in Net Interest Income	$ (22)	$ (40)	(86)	(128)
Cash flow hedges \| Consolidated obligation bonds
Derivative Instruments, Gain (Loss) [Line Items]
Ineffectiveness Recorded in Derivatives and Hedging Activities			0	0
Effective Portion Recorded in AOCI			0	0
Amount Recorded in Net Interest Income			$ (1)	$ (2)

Consolidated Obligations (Short

Consolidated Obligations (Short term discount notes) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Carrying Amount	$ 37,674	$ 41,191
Weighted Average Interest Rate	1.98%	1.23%

Consolidated Obligations (Long

Consolidated Obligations (Long term bonds by maturity date) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Contractual Maturity
Due in one year or less	$ 24,310
One to two years	7,011
Two to three years	4,714
Three to four years	4,152
Four to five years	2,061
Thereafter	4,369
Total par value	$ 46,617	$ 37,347
Weighted Average Interest Rate
Due in one year or less	1.88%
One to two years	1.82%
Two to three years	2.16%
Three to four years	2.23%
Four to five years	2.94%
Thereafter	3.03%
Total par value	2.08%
By Maturity or Next Call Date
Contractual Maturity
Due in one year or less	$ 35,432
One to two years	6,503
Two to three years	1,867
Three to four years	1,268
Four to five years	983
Thereafter	564
Total par value	$ 46,617
Minimum
Extinguishment of Debt [Line Items]
Debt Instrument, Term	1 year
Maximum
Extinguishment of Debt [Line Items]
Debt Instrument, Term	20 years

Consolidated Obligations (Bonds

Consolidated Obligations (Bonds by callable feature) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Par value	$ 46,617	$ 37,347
Fair value hedging adjustments	(373)	(214)
Other adjustments	(12)	(12)
Consolidated obligation bonds	46,232	37,121
Noncallable
Debt Instrument [Line Items]
Par value	33,202	23,644
Callable
Debt Instrument [Line Items]
Par value	$ 13,415	$ 13,703

Consolidated Obligations (Syste

Consolidated Obligations (Systemwide joint & several liability) (Details) - Guarantee of Indebtedness of Others [Member] - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Obligation with Joint and Several Liability Arrangement [Line Items]
FHLB System total consolidated obligations	$ 1,019,098	$ 1,034,260
FHLB Chicago as primary obligor	$ 84,358	$ 78,582
As a percent of the FHLB System	8.00%	8.00%
Consolidated obligation bonds
Obligation with Joint and Several Liability Arrangement [Line Items]
FHLB System total consolidated obligations	$ 615,216	$ 642,211
FHLB Chicago as primary obligor	$ 46,617	$ 37,347
As a percent of the FHLB System	8.00%	6.00%
Discount notes
Obligation with Joint and Several Liability Arrangement [Line Items]
FHLB System total consolidated obligations	$ 403,882	$ 392,049
FHLB Chicago as primary obligor	$ 37,741	$ 41,235
As a percent of the FHLB System	9.00%	11.00%

Capital and Mandatorily Redee_3

Capital and Mandatorily Redeemable Capital Stock (MRCS) (Capital rules) (Details) - $ / shares	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Federal Home Loan Banks [Abstract]
par value per share	$ 100	$ 100
Capital Stock, Redemption, Period of Written Notice	5 years

Capital and Mandatorily Redee_4

Capital and Mandatorily Redeemable Capital Stock (MRCS) (Regulatory capital requirements) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Federal Home Loan Banks [Abstract]
Risk Based Capital, Requirement	$ 1,219	$ 1,075
Risk Based Capital, Actual	5,519	5,051
Total Regulatory Capital, Requirement	3,656	3,374
Total Regulatory Capital, Actual	$ 5,519	$ 5,051
Total Regulatory Capital Ratio, Requirement	4.00%	4.00%
Total Regulatory Capital Ratio, Actual	6.04%	5.99%
Leverage Capital, Requirement	$ 4,571	$ 4,218
Leverage Capital, Actual	$ 8,278	$ 7,577
Leverage Capital Ratio, Requirement	5.00%	5.00%
Leverage Capital Ratio, Actual	9.06%	8.98%

Capital and Mandatorily Redee_5

Capital and Mandatorily Redeemable Capital Stock (MRCS) Stockholder Concentration (Details) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Amount of Which is Classified as a Liability (MRCS)		$ 313	$ 311
Stockholders' Equity, Total [Member] \| BMO Harris Bank, N.A. [Member]
Concentration Risk [Line Items]
Regulatory Capital Stock Outstanding		$ 314
% of Total Outstanding		15.50%
Amount of Which is Classified as a Liability (MRCS)		$ 0
Stockholders' Equity, Total [Member] \| The Northern Trust Company [Member]
Concentration Risk [Line Items]
Regulatory Capital Stock Outstanding		$ 247
% of Total Outstanding		12.20%
Amount of Which is Classified as a Liability (MRCS)		$ 0
Stockholders' Equity, Total [Member] \| One Mortgage Partners Corp. [Member]
Concentration Risk [Line Items]
Regulatory Capital Stock Outstanding	[1]	$ 245
% of Total Outstanding		12.10%
Amount of Which is Classified as a Liability (MRCS)		$ 245

[1]	One Mortgage Partners Corp. is a subsidiary of JPMorgan Chase Bank NA.

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 112
Amounts reclassified in period to statements of income:
Ending balance	$ 118		118
AOCI
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	122	$ 67	112	$ (36)
Change in the period recorded to the statements of condition, before reclassifications to statements of income	(15)	31	(7)	138
Amounts reclassified in period to statements of income:
Net interest income	10	(1)	13	(4)
Noninterest gain (loss)		(1)	(1)	(2)
Noninterest expense	1		1
Ending balance	118	96	118	96
Net Unrealized - \| Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	315	478	407	459
Change in the period recorded to the statements of condition, before reclassifications to statements of income	(32)	(24)	(124)	(5)
Amounts reclassified in period to statements of income:
Net interest income	0	0	0	0
Noninterest gain (loss)		0	0	0
Ending balance	283	454	283	454
Non-credit OTTI - \| Held-to-maturity Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(128)	(160)	(143)	(177)
Change in the period recorded to the statements of condition, before reclassifications to statements of income	7	8	22	25
Amounts reclassified in period to statements of income:
Net interest income	0	0	0	0
Noninterest gain (loss)		0	0	0
Ending balance	(121)	(152)	(121)	(152)
Net Unrealized - Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(57)	(243)	(147)	(312)
Change in the period recorded to the statements of condition, before reclassifications to statements of income	15	44	103	117
Amounts reclassified in period to statements of income:
Net interest income	10	(1)	13	(4)
Noninterest gain (loss)		(1)	(1)	(2)
Ending balance	(32)	(201)	(32)	(201)
Post-Retirement Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(8)	(8)	(5)	(6)
Change in the period recorded to the statements of condition, before reclassifications to statements of income	(5)	3	(8)	1
Amounts reclassified in period to statements of income:
Noninterest expense	1		1
Ending balance	$ (12)	$ (5)	$ (12)	$ (5)

Fair Value Fair Value Estimates

Fair Value Fair Value Estimates (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	$ 2,596	$ 233
Available-for-sale	13,707	12,957
Held-to-maturity debt securities	3,217	4,538
Advances	908	776
Derivative assets	11	3
Other assets	116	118
Derivative assets netting and cash collateral	(160)	(222)
Assets	91,410	84,355
Consolidated obligation discount notes	0	(749)
Consolidated obligation bonds	(2,202)	(5,260)
Derivative liabilities	(25)	(20)
Derivative liabilities netting and cash collateral	395	470
Liabilities	(86,086)	(79,503)
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	44	42
Interest bearing deposits	775	775
Federal Funds sold and securities purchased under agreements to resell	9,835	12,561
Held-to-maturity debt securities	2,928	4,157
Advances	53,759	47,309
MPF Loans held in portfolio, net	6,433	5,186
Other assets	169	119
Financial assets	91,288	84,246
Other non financial assets	122	109
Assets	91,410	84,355
Deposits	(581)	(524)
Consolidated obligation discount notes	(37,674)	(40,442)
Consolidated obligation bonds	(44,030)	(31,861)
Mandatorily redeemable capital stock	(313)	(311)
Other liabilities	(154)	(94)
Financial liabilities	(84,979)	(79,261)
Other non financial liabilities	(1,107)	(242)
Liabilities	(86,086)	(79,503)
Carrying Amount \| Carried at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	2,596	233
Available-for-sale	13,707	12,957
Advances	908	776
Derivative assets	11	3
Other assets	116	118
Consolidated obligation discount notes		(749)
Consolidated obligation bonds	(2,202)	(5,260)
Derivative liabilities	(25)	(20)
Carrying Amount \| Carried at fair value on a recurring basis \| Government related non-MBS, ABS, and MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	13,663	12,907
Carrying Amount \| Carried at fair value on a recurring basis \| Residential MBS \| Private label residential MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	44	50
Carrying Amount \| Carried at fair value on a nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
MPF Loans held in portfolio, net	6	7
Other assets	1	3
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	44	42
Interest bearing deposits	775	775
Federal Funds sold and securities purchased under agreements to resell	9,835	12,561
Held-to-maturity debt securities	3,217	4,538
Advances	53,784	47,336
MPF Loans held in portfolio, net	6,396	5,306
Other assets	169	119
Financial assets	91,565	84,774
Deposits	(581)	(524)
Consolidated obligation discount notes	(37,667)	(40,437)
Consolidated obligation bonds	(43,996)	(32,011)
Mandatorily redeemable capital stock	(313)	(311)
Other liabilities	(154)	(94)
Financial liabilities	(84,938)	(79,406)
Fair Value \| Carried at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	2,596	233
Available-for-sale	13,707	12,957
Advances	908	776
Derivative assets	11	3
Other assets	116	118
Consolidated obligation discount notes		(749)
Consolidated obligation bonds	(2,202)	(5,260)
Derivative liabilities	(25)	(20)
Fair Value \| Carried at fair value on a recurring basis \| Government related non-MBS, ABS, and MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	13,663	12,907
Fair Value \| Carried at fair value on a recurring basis \| Residential MBS \| Private label residential MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	44	50
Fair Value \| Carried at fair value on a nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
MPF Loans held in portfolio, net	6	7
Other assets	1	3
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	44	42
Interest bearing deposits	775	775
Federal Funds sold and securities purchased under agreements to resell	0	0
Held-to-maturity debt securities	0	0
Advances	0	0
MPF Loans held in portfolio, net	0	0
Other assets	0	0
Financial assets	820	817
Deposits	0	0
Consolidated obligation discount notes	0	0
Consolidated obligation bonds	0	0
Mandatorily redeemable capital stock	(313)	(311)
Other liabilities	0	0
Financial liabilities	(313)	(311)
Level 1 \| Carried at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	0	0
Available-for-sale	0	0
Advances	0	0
Derivative assets	1	0
Other assets	0	0
Consolidated obligation discount notes		0
Consolidated obligation bonds	0	0
Derivative liabilities	0	0
Level 1 \| Carried at fair value on a recurring basis \| Government related non-MBS, ABS, and MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	0	0
Level 1 \| Carried at fair value on a recurring basis \| Residential MBS \| Private label residential MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	0	0
Level 1 \| Carried at fair value on a nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
MPF Loans held in portfolio, net	0	0
Other assets	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	0	0
Interest bearing deposits	0	0
Federal Funds sold and securities purchased under agreements to resell	9,835	12,561
Held-to-maturity debt securities	2,549	3,734
Advances	53,784	47,336
MPF Loans held in portfolio, net	6,387	5,295
Other assets	169	119
Financial assets	90,177	83,304
Deposits	(581)	(524)
Consolidated obligation discount notes	(37,667)	(40,437)
Consolidated obligation bonds	(43,996)	(32,011)
Mandatorily redeemable capital stock	0	0
Other liabilities	(154)	(94)
Financial liabilities	(85,020)	(79,565)
Level 2 \| Carried at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	2,596	233
Available-for-sale	13,663	12,907
Advances	908	776
Derivative assets	170	225
Other assets	116	118
Consolidated obligation discount notes		(749)
Consolidated obligation bonds	(2,202)	(5,260)
Derivative liabilities	(420)	(490)
Level 2 \| Carried at fair value on a recurring basis \| Government related non-MBS, ABS, and MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	13,663	12,907
Level 2 \| Carried at fair value on a recurring basis \| Residential MBS \| Private label residential MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	0	0
Level 2 \| Carried at fair value on a nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
MPF Loans held in portfolio, net	0	0
Other assets	0	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	0	0
Interest bearing deposits	0	0
Federal Funds sold and securities purchased under agreements to resell	0	0
Held-to-maturity debt securities	668	804
Advances	0	0
MPF Loans held in portfolio, net	9	11
Other assets	0	0
Financial assets	728	875
Deposits	0	0
Consolidated obligation discount notes	0	0
Consolidated obligation bonds	0	0
Mandatorily redeemable capital stock	0	0
Other liabilities	0	0
Financial liabilities	0	0
Level 3 \| Carried at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Trading debt securities	0	0
Available-for-sale	44	50
Advances	0	0
Derivative assets	0	0
Other assets	0	0
Consolidated obligation discount notes		0
Consolidated obligation bonds	0	0
Derivative liabilities	0	0
Level 3 \| Carried at fair value on a recurring basis \| Government related non-MBS, ABS, and MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	0	0
Level 3 \| Carried at fair value on a recurring basis \| Residential MBS \| Private label residential MBS
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale	44	50
Level 3 \| Carried at fair value on a nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
MPF Loans held in portfolio, net	6	7
Other assets	$ 1	$ 3

Fair Value Gains (losses) on fa

Fair Value Gains (losses) on fair value option (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Instruments held under fair value option	$ (3)	$ (5)	$ (20)	$ (3)
Advances
Fair Value, Option, Quantitative Disclosures [Line Items]
Instruments held under fair value option	(1)	(1)	(11)	2
Discount notes
Fair Value, Option, Quantitative Disclosures [Line Items]
Instruments held under fair value option	0	(1)	0	(1)
Consolidated obligation bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Instruments held under fair value option	(1)	(3)	(3)	(3)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Instruments held under fair value option	$ (1)	$ 0	$ (6)	$ (1)

Fair Value (Fair Value Option D

Fair Value (Fair Value Option Difference Between Fair Value and Unpaid Principal Balance) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]
Unpaid principal balance	$ 54,763	$ 48,020
Advances, Fair Value Disclosure	908	776
Unpaid principal balance	46,617	37,347
Long-term Debt, Fair Value	2,202	5,260
Advances
Fair Value, Option, Quantitative Disclosures [Line Items]
Unpaid principal balance	929	786
Fair value over (under) UPB	(21)	(10)
Advances, Fair Value Disclosure	908	776
Consolidated obligation bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Unpaid principal balance	2,213	5,270
Fair value over (under) UPB	(11)	(10)
Long-term Debt, Fair Value	$ 2,202	$ 5,260

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Commitments
Expire within one year		$ 20,586	$ 16,239
Expire after one year		4,606	4,206
Total		25,192	20,445
Unsettled consolidated obligation bonds
Commitments
Expire within one year		25	0
Expire after one year		0	0
Total		25	0
Member standby letters of credit
Commitments
Expire within one year		18,407	15,703
Expire after one year	[1]	4,308	3,869
Total		22,715	19,572
Portion of member standby letters of credit which were renewable annually		1,600	750
Housing authority standby bond purchase agreements
Commitments
Expire within one year		71	0
Expire after one year		295	337
Total		366	337
Advance commitments
Commitments
Expire within one year		1,647	151
Expire after one year		3	0
Total		1,650	151
MPF delivery commitments
Commitments
Expire within one year		433	371
Expire after one year		0	0
Total		433	371
Other
Commitments
Expire within one year		3	14
Expire after one year		0	0
Total		$ 3	$ 14

[1]	Contains $1.6 billion and $750 million of member standby letters of credit as of September 30, 2018 , and December 31, 2017

Transactions with Related Par_3

Transactions with Related Parties and Other FHLBs (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Accounts With Related Party Transactions [Line Items]
Assets - Advances	$ 54,667	$ 48,085
Liabilities - Deposits	581	524
Equity - Capital Stock	1,718	1,443
Transactions with members
Accounts With Related Party Transactions [Line Items]
Assets - Advances	629	165
Liabilities - Deposits	6	13
Equity - Capital Stock	$ 27	$ 10