Federal Home Loan Bank of Atlanta 10-Q9 May 182018 Q1 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	Federal Home Loan Bank of Atlanta
Entity Central Index Key	1,331,465
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		57,367,756

Statements of Condition (Unaudi

Statements of Condition (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 80	$ 2,357
Interest-bearing deposits (including deposits with other FHLBanks of $3 and $22 as of March 31, 2018 and December 31, 2017, respectively)	2,717	2,176
Securities purchased under agreements to resell	6,000	2,500
Federal funds sold	10,728	9,380
Investment securities:
Trading securities	55	56
Available-for-sale securities	1,053	1,104
Held-to-maturity securities (fair value of $26,951 and $25,219 as of March 31, 2018 and December 31, 2017, respectively)	26,930	25,162
Total investment securities	28,038	26,322
Advances	91,733	102,440
Mortgage loans held for portfolio, net:
Mortgage loans held for portfolio	417	436
Allowance for credit losses on mortgage loans	(1)	(1)
Total mortgage loans held for portfolio, net	416	435
Loan to another FHLBank	0	200
Accrued interest receivable	235	208
Derivative assets	322	334
Premises and equipment, net	21	22
Other assets	170	192
Total assets	140,460	146,566
Liabilities
Interest-bearing deposits	1,213	1,177
Consolidated obligations, net:
Discount notes	54,659	50,139
Bonds	77,160	87,523
Total consolidated obligations, net	131,819	137,662
Mandatorily redeemable capital stock	3	1
Accrued interest payable	144	142
Affordable Housing Program payable	80	77
Derivative liabilities	22	21
Other liabilities	284	219
Total liabilities	133,565	139,299
Commitments and contingencies (Note 15)
Capital
Total capital stock Class B putable	4,748	5,154
Retained earnings:
Restricted	403	380
Unrestricted	1,649	1,623
Total retained earnings	2,052	2,003
Accumulated other comprehensive income	95	110
Total capital	6,895	7,267
Total liabilities and capital	140,460	146,566
Subclass B1 [Member]
Capital
Total capital stock Class B putable	855	819
Subclass B2 [Member]
Capital
Total capital stock Class B putable	$ 3,893	$ 4,335

Statements of Condition (Unaud3

Statements of Condition (Unaudited) (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Deposits with other FHLBanks	$ 3	$ 22
Held-to-maturity securities, fair value	$ 26,951	$ 25,219
Capital stock Class B putable par value (per share)	$ 100	$ 100
Subclass B1 [Member]
Capital stock, shares issued	8	8
Capital stock, shares outstanding	8	8
Subclass B2 [Member]
Capital stock, shares issued	39	44
Capital stock, shares outstanding	39	44

Statements of Income (Unaudited

Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
Statements of Income (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Interest income
Advances	$ 455
Advances		$ (81)
Prepayment fees, net	0	1
Interest-bearing deposits	14	5
Securities purchased under agreements to resell	6	1
Federal funds sold	49	19
Trading securities	0	3
Available-for-sale securities	26	27
Held-to-maturity securities	127	85
Mortgage loans	6	7
Total interest income	683	67
Interest expense
Consolidated obligation discount notes	224	68
Consolidated obligation bonds	320	199
Interest-bearing deposits	4	2
Total interest expense	548	269
Net interest income (expense)	135	(202)
Noninterest income (loss)
Net losses on trading securities	(1)	(2)
Net gains on derivatives and hedging activities	22	313
Standby letters of credit fees	6	7
Other	0	1
Total noninterest income	27	319
Noninterest expense
Compensation and benefits	20	19
Other operating expenses	9	9
Finance Agency	2	2
Office of Finance	2	2
Other	2	2
Total noninterest expense	35	34
Income before assessments	127	83
Affordable Housing Program assessments	13	8
Net income	$ 114	$ 75

Statements of Comprehensive Inc

Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 114	$ 75
Net noncredit portion of other-than-temporary impairment losses on available-for-sale securities:
Net change in fair value on other-than-temporarily impaired available-for-sale securities	(16)	0
Pension and postretirement benefit plans	1	1
Total other comprehensive (loss) income	(15)	1
Total comprehensive income	$ 99	$ 76

Statements of Stockholders' Equ

Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Capital Stock Class B Putable [Member]	Retained Earnings	Retained Earnings, Restricted [Member]	Retained Earnings, Unrestricted [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balance (shares) at Dec. 31, 2016		50
Beginning balance at Dec. 31, 2016	$ 6,951	$ 4,955	$ 1,892	$ 310	$ 1,582	$ 104
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of capital stock (shares)		20
Issuance of capital stock	2,034	$ 2,034
Repurchase/redemption of capital stock (shares)		(23)
Repurchase/redemption of capital stock	(2,331)	$ (2,331)
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Shares		0
Net shares reclassified to mandatorily redeemable capital stock	(8)	$ (8)
Comprehensive income (loss)	76		75	16	59	1
Cash dividends on capital stock	(57)		(57)	0	(57)
Ending balance (shares) at Mar. 31, 2017		47
Ending balance at Mar. 31, 2017	6,665	$ 4,650	1,910	326	1,584	105
Beginning balance (shares) at Dec. 31, 2017		52
Beginning balance at Dec. 31, 2017	7,267	$ 5,154	2,003	380	1,623	110
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of capital stock (shares)		35
Issuance of capital stock	3,495	$ 3,495
Repurchase/redemption of capital stock (shares)		(40)
Repurchase/redemption of capital stock	(3,869)	$ (3,869)
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Shares		0
Net shares reclassified to mandatorily redeemable capital stock	(32)	$ (32)
Comprehensive income (loss)	99		114	23	91	(15)
Cash dividends on capital stock	(65)		(65)	0	(65)
Ending balance (shares) at Mar. 31, 2018		47
Ending balance at Mar. 31, 2018	$ 6,895	$ 4,748	$ 2,052	$ 403	$ 1,649	$ 95

Statements of Cash Flows (Unaud

Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net income	$ 114	$ 75
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8	(18)
Net change in fair value adjustment on derivatives and related hedging activities	179	36
Net change in fair value adjustment on trading securities	1	2
Net change in:
Accrued interest receivable	(27)	(5)
Other assets	22	22
Affordable Housing Program payable	3	4
Accrued interest payable	2	49
Other liabilities	(33)	(31)
Total adjustments	155	59
Net Cash Provided by (Used in) Operating Activities	269	134
Investing activities
Interest-bearing deposits	(475)	255
Securities purchased under agreements to resell	(3,500)	(1,000)
Federal funds sold	(1,348)	(3,406)
Loan to another FHLBank	200	0
Available-for-sale securities:
Proceeds from principal collected	51	71
Held-to-maturity securities:
Net change in short-term	0	(350)
Proceeds from principal collected	1,273	1,766
Purchases of long-term	(2,945)	(2,376)
Advances:
Proceeds from principal collected	140,699	86,936
Made	(130,323)	(78,979)
Mortgage loans:
Proceeds from principal collected	19	28
Purchases from another FHLBank	0	(18)
Proceeds from sale of foreclosed assets	1	1
Purchase of premises, equipment, and software	(1)	(1)
Net cash provided by investing activities	3,651	2,927
Financing activities
Net change in interest-bearing deposits	3	87
Net payments on derivatives containing a financing element	(1)	(10)
Proceeds from issuance of consolidated obligations:
Discount notes	280,479	158,899
Bonds	14,051	9,260
Payments for debt issuance costs	(3)	(2)
Payments for maturing and retiring consolidated obligations:
Discount notes	(275,982)	(158,123)
Bonds	(24,275)	(13,584)
Proceeds from issuance of capital stock	3,495	2,034
Payments for repurchase/redemption of capital stock	(3,869)	(2,331)
Payments for repurchase/redemption of mandatorily redeemable capital stock	(30)	(8)
Cash dividends paid	(65)	(57)
Net cash used in financing activities	(6,197)	(3,835)
Net decrease in cash and due from banks	(2,277)	(774)
Cash and due from banks at beginning of the period	2,357	1,815
Cash and due from banks at end of the period	80	1,041
Cash paid for:
Interest	523	226
Affordable Housing Program assessments, net	9	4
Noncash investing and financing activities:
Net shares reclassified to mandatorily redeemable capital stock	32	8
Held-to-maturity securities acquired with accrued liabilities	97	22
Transfers of mortgage loans to real estate owned	$ 1	$ 1

Basis of Presentation

Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2018
Basis of Presentation [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation The accompanying unaudited interim financial statements of the Federal Home Loan Bank of Atlanta (Bank) have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). To prepare the financial statements in conformity with GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and income and expenses during the reporting period. Actual results could be different from these estimates. The foregoing interim financial statements are unaudited; however, in the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the results for the interim periods, have been included. The results of operations for interim periods are not necessarily indicative of results to be expected for the year ending December 31, 2018 , or for other interim periods. The unaudited interim financial statements should be read in conjunction with the audited financial statements for the year ended December 31, 2017 , which are contained in the Bank’s 2017 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on March 8, 2018 (Form 10-K). The Bank has certain financial instruments, including derivative instruments and securities purchased under agreements to resell, that are subject to offset under master netting arrangements or by operation of law. Additional information regarding derivative instruments is provided in Note 13 — Derivatives and Hedging Activities to the Bank’s interim financial statements. The Bank does not have any offsetting liabilities related to its securities purchased under agreements to resell for the periods presented. Based on the fair value of the related securities held as collateral, the securities purchased under agreements to resell were fully collateralized for the periods presented. Refer to Note 2 — Summary of Significant Accounting Policies to the Bank’s 2017 audited financial statements for a description of all the Bank’s significant accounting policies. There have been no changes to these policies as of March 31, 2018

Recently Issued and Adopted Acc

Recently Issued and Adopted Accounting Guidance	3 Months Ended
Recently Issued and Adopted Accounting Guidance	Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recently Issued And Adopted Accounting Guidance	Recently Issued and Adopted Accounting Guidance Recently Issued Accounting Guidance Targeted Improvements to Accounting for Hedging Activities. In August 2017, the Financial Accounting Standards Board (FASB) issued amended guidance intended to better portray the economic results of an entity’s risk management activities in its financial statements. This guidance requires that, for fair value hedges, the entire change in the fair value of the hedging instrument included in the assessment of hedge effectiveness be presented in the same income statement line item that is used to present the earnings effect of the hedged item. In addition, the amendments permit (1) measuring the change in fair value of the hedged item on the basis of the benchmark rate component of the contractual coupon cash flows determined at hedged inception; (2) measuring the hedged item in a partial-term fair value hedge of interest-rate risk by assuming that the hedged item has a term that reflects only the designated cash flows being hedged; and (3) considering only how changes in the benchmark interest rate affect a decision to settle a prepayable instrument before its scheduled maturity in calculating the change in the fair value of the hedged item attributable to interest-rate risk. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2018. Early application is permitted although the Bank does not intend to adopt this guidance early. The amended presentation and disclosure guidance will be applied prospectively. The Bank is in the process of evaluating this guidance, and its impact on the Bank’s financial condition and results of operations has not yet been determined. Premium Amortization on Purchased Callable Debt Securities. In March 2017, the FASB issued guidance intended to better align the amortization period of callable debt securities held at a premium to expectations incorporated in market pricing on the underlying securities. This guidance shortens the amortization period for certain callable debt securities held at a premium by requiring that the premium be amortized to the earliest call date. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2018. Early application is permitted although the Bank does not intend to adopt this guidance early. This guidance will be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the fiscal year in which this guidance is adopted. The Bank is in the process of evaluating this guidance, but this guidance is not expected to have a material impact on the Bank’s financial condition or results of operations. Measurement of Credit Losses on Financial Instruments. In June 2016, the FASB issued guidance intended to improve the timeliness of recording credit losses on loans and other financial instruments held by financial institutions and other organizations. This guidance requires all expected credit losses for financial assets that are held at the reporting date to be measured based on historical experience, current conditions, and reasonable and supportable forecasts. Credit losses related to available-for-sale securities will be recorded through an allowance for credit losses. Additionally, this guidance amends the accounting for purchased financial assets with credit deterioration and requires enhanced disclosures that provide additional information to help financial statement users better understand significant estimates and judgments. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2019. Early application is permitted for the interim and annual periods beginning after December 15, 2018, although the Bank does not intend to adopt this guidance early. While the Bank is in the process of evaluating this guidance, its adoption may result in an increase in the allowance for credit losses, but its impact on the Bank’s financial condition and results of operations will depend upon the composition of the financial assets held by the Bank at the adoption date, as well as the economic conditions and forecasts at that time. Leases. In February 2016, the FASB issued guidance on accounting for leases and disclosure of key information about leasing arrangements. This guidance requires lessees to recognize the following for all operating and finance leases at the commencement date: (1) a lease liability, which is the obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset representing the lessee’s right to use, or control the use of, the underlying asset for the lease term. A lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities for short-term leases with a term of 12 months or less. This guidance does not fundamentally change lessor accounting; however, some changes have been made to align that guidance with the lessee guidance and other areas within GAAP. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2018. Early application is permitted although the Bank does not intend to adopt this guidance early. This guidance will be applied on a modified retrospective basis for leases existing at, or entered into after, the earliest period presented in the financial statements. The adoption of this guidance is not expected to have a material impact on the Bank’s financial condition or results of operations. Recently Adopted Accounting Guidance Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. In March 2017, the FASB issued guidance intended to improve the presentation of net periodic pension and postretirement benefit costs. This guidance requires an employer to report the service cost component in the same line item as compensation costs on the income statement, while the other components of net benefit cost are required to be presented separately from the service cost component. Additionally, this guidance only allows the service cost component to be eligible for capitalization, when applicable. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2018. For the presentation of the service cost component and the other components of net benefit cost on the income statement, this guidance was applied retrospectively. For the capitalization of the service cost component of net benefit cost in assets, this guidance was applied prospectively on and after the effective date. The adoption of this guidance did not have a material impact on the Bank's financial condition or results of operations. Classification of Certain Cash Receipts and Cash Payments. In August 2016, the FASB issued guidance intended to reduce diversity in practice in how cash receipts and cash payments are presented and classified on the Statements of Cash Flows for certain transactions. This guidance was adopted on a retrospective basis and became effective for the Bank beginning on January 1, 2018. The disclosure of cash paid for interest as reported in the supplemental disclosures of cash flow information increased by $68 for the three months ended March 31, 2017 and relates to accreted interest on zero-interest debt instruments. The adoption of this guidance did not have an impact on the Bank’s financial condition, results of operations, or cash flows. Recognition and Measurement of Financial Assets and Financial Liabilities. In January 2016, the FASB issued guidance designed to improve the recognition, measurement, presentation, and disclosure of financial instruments through targeted changes to existing GAAP. This guidance requires, among other things, the following: (1) use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (2) separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and (3) separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk (also referred to as “own credit”) when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. Additionally, these changes eliminate the requirement to disclose the method and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2018. The adoption of this guidance did not have an impact on the Bank’s financial condition or results of operations. Revenue from Contracts with Customers.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Guidance Targeted Improvements to Accounting for Hedging Activities. In August 2017, the Financial Accounting Standards Board (FASB) issued amended guidance intended to better portray the economic results of an entity’s risk management activities in its financial statements. This guidance requires that, for fair value hedges, the entire change in the fair value of the hedging instrument included in the assessment of hedge effectiveness be presented in the same income statement line item that is used to present the earnings effect of the hedged item. In addition, the amendments permit (1) measuring the change in fair value of the hedged item on the basis of the benchmark rate component of the contractual coupon cash flows determined at hedged inception; (2) measuring the hedged item in a partial-term fair value hedge of interest-rate risk by assuming that the hedged item has a term that reflects only the designated cash flows being hedged; and (3) considering only how changes in the benchmark interest rate affect a decision to settle a prepayable instrument before its scheduled maturity in calculating the change in the fair value of the hedged item attributable to interest-rate risk. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2018. Early application is permitted although the Bank does not intend to adopt this guidance early. The amended presentation and disclosure guidance will be applied prospectively. The Bank is in the process of evaluating this guidance, and its impact on the Bank’s financial condition and results of operations has not yet been determined. Premium Amortization on Purchased Callable Debt Securities. In March 2017, the FASB issued guidance intended to better align the amortization period of callable debt securities held at a premium to expectations incorporated in market pricing on the underlying securities. This guidance shortens the amortization period for certain callable debt securities held at a premium by requiring that the premium be amortized to the earliest call date. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2018. Early application is permitted although the Bank does not intend to adopt this guidance early. This guidance will be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the fiscal year in which this guidance is adopted. The Bank is in the process of evaluating this guidance, but this guidance is not expected to have a material impact on the Bank’s financial condition or results of operations. Measurement of Credit Losses on Financial Instruments. In June 2016, the FASB issued guidance intended to improve the timeliness of recording credit losses on loans and other financial instruments held by financial institutions and other organizations. This guidance requires all expected credit losses for financial assets that are held at the reporting date to be measured based on historical experience, current conditions, and reasonable and supportable forecasts. Credit losses related to available-for-sale securities will be recorded through an allowance for credit losses. Additionally, this guidance amends the accounting for purchased financial assets with credit deterioration and requires enhanced disclosures that provide additional information to help financial statement users better understand significant estimates and judgments. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2019. Early application is permitted for the interim and annual periods beginning after December 15, 2018, although the Bank does not intend to adopt this guidance early. While the Bank is in the process of evaluating this guidance, its adoption may result in an increase in the allowance for credit losses, but its impact on the Bank’s financial condition and results of operations will depend upon the composition of the financial assets held by the Bank at the adoption date, as well as the economic conditions and forecasts at that time. Leases. In February 2016, the FASB issued guidance on accounting for leases and disclosure of key information about leasing arrangements. This guidance requires lessees to recognize the following for all operating and finance leases at the commencement date: (1) a lease liability, which is the obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset representing the lessee’s right to use, or control the use of, the underlying asset for the lease term. A lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities for short-term leases with a term of 12 months or less. This guidance does not fundamentally change lessor accounting; however, some changes have been made to align that guidance with the lessee guidance and other areas within GAAP. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2018. Early application is permitted although the Bank does not intend to adopt this guidance early. This guidance will be applied on a modified retrospective basis for leases existing at, or entered into after, the earliest period presented in the financial statements. The adoption of this guidance is not expected to have a material impact on the Bank’s financial condition or results of operations. Recently Adopted Accounting Guidance Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. In March 2017, the FASB issued guidance intended to improve the presentation of net periodic pension and postretirement benefit costs. This guidance requires an employer to report the service cost component in the same line item as compensation costs on the income statement, while the other components of net benefit cost are required to be presented separately from the service cost component. Additionally, this guidance only allows the service cost component to be eligible for capitalization, when applicable. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2018. For the presentation of the service cost component and the other components of net benefit cost on the income statement, this guidance was applied retrospectively. For the capitalization of the service cost component of net benefit cost in assets, this guidance was applied prospectively on and after the effective date. The adoption of this guidance did not have a material impact on the Bank's financial condition or results of operations. Classification of Certain Cash Receipts and Cash Payments. In August 2016, the FASB issued guidance intended to reduce diversity in practice in how cash receipts and cash payments are presented and classified on the Statements of Cash Flows for certain transactions. This guidance was adopted on a retrospective basis and became effective for the Bank beginning on January 1, 2018. The disclosure of cash paid for interest as reported in the supplemental disclosures of cash flow information increased by $68 for the three months ended March 31, 2017 and relates to accreted interest on zero-interest debt instruments. The adoption of this guidance did not have an impact on the Bank’s financial condition, results of operations, or cash flows. Recognition and Measurement of Financial Assets and Financial Liabilities. In January 2016, the FASB issued guidance designed to improve the recognition, measurement, presentation, and disclosure of financial instruments through targeted changes to existing GAAP. This guidance requires, among other things, the following: (1) use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (2) separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and (3) separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk (also referred to as “own credit”) when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. Additionally, these changes eliminate the requirement to disclose the method and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2018. The adoption of this guidance did not have an impact on the Bank’s financial condition or results of operations. Revenue from Contracts with Customers.

Trading Securities

Trading Securities	3 Months Ended
Trading Securities	Mar. 31, 2018
Trading Securities [Abstract]
Trading Securities	Trading Securities Major Security Types. The following table presents trading securities. As of March 31, 2018 As of December 31, 2017 Government-sponsored enterprises debt obligations $ 55 $ 56 The following table presents net losses on trading securities. For the Three Months Ended March 31, 2018 2017 Net losses on trading securities held at period end $ (1 ) $ (2 )

Available-for-sale Securities

Available-for-sale Securities	3 Months Ended
Available-for-sale Securities	Mar. 31, 2018
Available-for-sale Securities [Abstract]
Available-for-sale Securities	Available-for-sale Securities Major Security Type. The following table presents information on private-label residential mortgage-backed securities (MBS) that are classified as available-for-sale. Amortized Cost Other-than-temporary Impairment Recognized in Accumulated Other Comprehensive Income (1) Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of March 31, 2018 $ 935 $ 1 $ 119 $ — $ 1,053 As of December 31, 2017 $ 970 $ 1 $ 135 $ — $ 1,104 ____________ (1) Amounts represent the non-credit portion of an other-than-temporary impairment during the life of the security. The following table presents private-label residential MBS that are classified as available-for-sale with unrealized losses. The unrealized losses are aggregated by the length of time that the individual securities have been in a continuous unrealized loss position. Less than 12 Months 12 Months or More Total Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses As of March 31, 2018 — $ — $ — 3 $ 9 $ 1 3 $ 9 $ 1 As of December 31, 2017 1 $ 7 $ 1 1 $ 4 $ — 2 $ 11 $ 1 The following table presents private-label residential MBS that are classified as available-for-sale and issued by members or affiliates of members, all of which have been issued by Bank of America Corporation, Charlotte, NC. Amortized Cost Other-than-temporary Impairment Recognized in Accumulated Other Comprehensive Income Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of March 31, 2018 $ 620 $ — $ 91 $ — $ 711 As of December 31, 2017 $ 638 $ 1 $ 104 $ — $ 741

Held-to-maturity Securities

Held-to-maturity Securities	3 Months Ended
Held-to-maturity Securities	Mar. 31, 2018
Held-to-maturity Securities, Unclassified [Abstract]
Held-to-maturity Securities	Held-to-maturity Securities Major Security Types. The following table presents held-to-maturity securities. As of March 31, 2018 As of December 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value State or local housing agency debt obligations $ 1 $ — $ — $ 1 $ 1 $ — $ — $ 1 Government-sponsored enterprises debt obligations 4,862 7 5 4,864 5,350 8 6 5,352 Mortgage-backed securities: U.S. agency obligations-guaranteed residential 146 2 — 148 157 2 — 159 Government-sponsored enterprises residential 10,136 63 51 10,148 9,357 65 24 9,398 Government-sponsored enterprises commercial 11,253 11 13 11,251 9,729 16 12 9,733 Private-label residential 532 8 1 539 568 8 — 576 Total $ 26,930 $ 91 $ 70 $ 26,951 $ 25,162 $ 99 $ 42 $ 25,219 The following tables present held-to-maturity securities with unrealized losses. The unrealized losses are aggregated by major security type and by the length of time that the individual securities have been in a continuous unrealized loss position. As of March 31, 2018 Less than 12 Months 12 Months or More Total Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses State or local housing agency debt obligations 1 $ 1 $ — — $ — $ — 1 $ 1 $ — Government-sponsored enterprises debt obligations 8 618 1 5 1,496 4 13 2,114 5 Mortgage-backed securities: Government-sponsored enterprises residential 18 1,976 33 39 1,091 18 57 3,067 51 Government-sponsored enterprises commercial 49 3,197 4 6 901 9 55 4,098 13 Private-label residential 12 50 1 11 34 — 23 84 1 Total 88 $ 5,842 $ 39 61 $ 3,522 $ 31 149 $ 9,364 $ 70 As of December 31, 2017 Less than 12 Months 12 Months or More Total Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses State or local housing agency debt obligations 1 $ 1 $ — — $ — $ — 1 $ 1 $ — Government-sponsored enterprises debt obligations 6 996 1 5 1,495 5 11 2,491 6 Mortgage-backed securities: Government-sponsored enterprises residential 12 1,466 11 40 1,154 13 52 2,620 24 Government-sponsored enterprises commercial 16 1,209 5 7 1,029 7 23 2,238 12 Private-label residential 7 19 — 16 70 — 23 89 — Total 42 $ 3,691 $ 17 68 $ 3,748 $ 25 110 $ 7,439 $ 42 Redemption Terms. The following table presents the amortized cost and estimated fair value of held-to-maturity securities by contractual maturity. MBS are not presented by contractual maturity because their actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees. As of March 31, 2018 As of December 31, 2017 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Non-mortgage-backed securities: Due in one year or less $ 2,325 $ 2,323 $ 2,913 $ 2,909 Due after one year through five years 2,072 2,073 1,972 1,975 Due after five years through 10 years 406 409 406 409 Due after 10 years 60 60 60 60 Total non-mortgage-backed securities 4,863 4,865 5,351 5,353 Mortgage-backed securities 22,067 22,086 19,811 19,866 Total $ 26,930 $ 26,951 $ 25,162 $ 25,219 The following table presents private-label residential MBS that are classified as held-to-maturity and issued by members or affiliates of members, all of which have been issued by Bank of America Corporation, Charlotte, NC. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of March 31, 2018 $ 116 $ 1 $ — $ 117 As of December 31, 2017 $ 125 $ 1 $ — $ 126

Other-than-temporary Impairment

Other-than-temporary Impairment	3 Months Ended
Other-than-temporary Impairment	Mar. 31, 2018
Other than Temporary Impairment Losses, Investments [Abstract]
Other-than-temporary Impairment	Other-than-temporary Impairment The Bank evaluates its individual available-for-sale and held-to-maturity securities holdings in an unrealized loss position for other-than-temporary impairment on a quarterly basis. The financial amounts related to the Bank's other-than-temporary impairment are not material to the Bank's financial condition or results of operations for the periods presented. The following table presents a roll-forward of the amount of credit losses on the Bank’s investment securities recognized in earnings during the life of the securities for which a portion of the other-than-temporary loss was recognized in accumulated other comprehensive income. For the Three Months Ended March 31, 2018 2017 Balance, beginning of period $ 394 $ 455 Increase in cash flows expected to be collected, (accreted as interest income over the remaining lives of the applicable securities) (16 ) (15 ) Balance, end of period $ 378 $ 440

Advances

Advances	3 Months Ended
Advances	Mar. 31, 2018
Advances [Abstract]
Advances	Advances Redemption Terms. The following table presents the Bank’s advances outstanding by year of contractual maturity. As of March 31, 2018 As of December 31, 2017 Due in one year or less 60,276 60,795 Due after one year through two years 10,214 10,779 Due after two years through three years 6,497 14,210 Due after three years through four years 3,213 4,162 Due after four years through five years 4,088 3,729 Due after five years 7,584 8,574 Total par value 91,872 102,249 Discount on AHP (1) advances (4 ) (4 ) Discount on EDGE (2) advances (2 ) (3 ) Hedging adjustments (133 ) 198 Total $ 91,733 $ 102,440 ___________ (1) The Affordable Housing Program (2) The Economic Development and Growth Enhancement Program The following table presents advances by year of contractual maturity or, for convertible advances, next conversion date. As of March 31, 2018 As of December 31, 2017 Due or convertible in one year or less 60,669 60,984 Due or convertible after one year through two years 10,380 10,846 Due or convertible after two years through three years 6,530 14,326 Due or convertible after three years through four years 3,233 4,184 Due or convertible after four years through five years 4,061 3,695 Due or convertible after five years 6,999 8,214 Total par value $ 91,872 $ 102,249 Interest-rate Payment Terms. The following table presents interest-rate payment terms for advances. As of March 31, 2018 As of December 31, 2017 Fixed-rate: Due in one year or less $ 41,147 $ 37,107 Due after one year 21,376 22,044 Total fixed-rate 62,523 59,151 Variable-rate: Due in one year or less 19,130 23,687 Due after one year 10,219 19,411 Total variable-rate 29,349 43,098 Total par value $ 91,872 $ 102,249 Credit Risk. The Bank’s potential credit risk from advances is concentrated in commercial banks, savings institutions, and credit unions and further is concentrated in certain larger borrowing relationships. The concentration of the Bank’s advances to its 10 largest borrowers was $65,398 and $71,440 as of March 31, 2018 and December 31, 2017 , respectively. This concentration represented 71.2 percent and 69.9 percent of total advances outstanding as of March 31, 2018 and December 31, 2017 , respectively. Based on the collateral pledged as security for advances, the Bank’s credit analysis of members’ financial condition, and prior repayment history, no allowance for credit losses on advances was deemed necessary by the Bank as of March 31, 2018 and December 31, 2017 . No advance was past due as of March 31, 2018 and December 31, 2017

Mortgage Loans Held for Portfol

Mortgage Loans Held for Portfolio	3 Months Ended
Mortgage Loans Held for Portfolio	Mar. 31, 2018
Mortgage Loans on Real Estate [Abstract]
Mortgage Loans Held for Portfolio	Mortgage Loans Held for Portfolio The following table presents information on mortgage loans held for portfolio by contractual maturity at the time of purchase. As of March 31, 2018 As of December 31, 2017 Medium-term (15 years or less) $ 15 $ 19 Long-term (greater than 15 years) 402 417 Total unpaid principal balance 417 436 Premiums 2 2 Discounts (2 ) (2 ) Total $ 417 $ 436 The following table presents the unpaid principal balance of mortgage loans held for portfolio by collateral or guarantee type. As of March 31, 2018 As of December 31, 2017 Conventional mortgage loans $ 391 $ 409 Government-guaranteed or insured mortgage loans 26 27 Total unpaid principal balance $ 417 $ 436 Refer to Note 9 —

Allowance for Credit Losses

Allowance for Credit Losses	3 Months Ended
Allowance for Credit Losses	Mar. 31, 2018
Allowance for Credit Losses [Abstract]
Allowance for Credit Losses	Allowance for Credit Losses The following table presents the activity in the allowance for credit losses related to conventional residential mortgage loans. For the Three Months Ended March 31, 2018 2017 Balance, beginning of period $ 1 $ 1 Provision for credit losses — — Balance, end of period $ 1 $ 1 The following table presents the recorded investment in conventional residential mortgage loans by impairment methodology. As of March 31, 2018 As of December 31, 2017 Allowance for credit losses: Collectively evaluated for impairment $ 1 $ 1 Recorded investment: Individually evaluated for impairment $ 11 $ 11 Collectively evaluated for impairment 382 400 Total recorded investment $ 393 $ 411 Key credit quality indicators for mortgage loans include the migration of past due mortgage loans, nonaccrual mortgage loans, and mortgage loans in process of foreclosure. The following tables present the Bank’s recorded investment in mortgage loans by these key credit quality indicators. As of March 31, 2018 Conventional Residential Mortgage Loans Government-guaranteed or Insured Residential Mortgage Loans Total Past due 30-59 days $ 11 $ 2 $ 13 Past due 60-89 days 3 2 5 Past due 90 days or more 11 — 11 Total past due mortgage loans 25 4 29 Total current mortgage loans 368 22 390 Total mortgage loans (1) $ 393 $ 26 $ 419 Other delinquency statistics: In process of foreclosure (2) $ 5 $ — $ 5 Seriously delinquent rate (3) 2.97 % 1.37 % 2.87 % Past due 90 days or more and still accruing interest (4) $ — $ — $ — Mortgage loans on nonaccrual status (5) $ 10 $ — $ 10 ____________ (1) The difference between the recorded investment and the carrying value of total mortgage loans of $2 relates to accrued interest. (2) Includes mortgage loans where the decision of foreclosure or similar alternative, such as a pursuit of deed-in-lieu, has been reported. Mortgage loans in the process of foreclosure are included in past due or current mortgage loans depending on their delinquency status. (3) Mortgage loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total mortgage loan portfolio segment. (4) Mortgage loans insured or guaranteed by the Federal Housing Administration or the Department of Veterans Affairs. (5) Represents mortgage loans with contractual principal or interest payments 90 days or more past due and not accruing interest. As of December 31, 2017 Conventional Residential Mortgage Loans Government-guaranteed or Insured Residential Mortgage Loans Total Past due 30-59 days $ 14 $ 3 $ 17 Past due 60-89 days 7 1 8 Past due 90 days or more 12 — 12 Total past due mortgage loans 33 4 37 Total current mortgage loans 378 23 401 Total mortgage loans (1) $ 411 $ 27 $ 438 Other delinquency statistics: In process of foreclosure (2) $ 6 $ — $ 6 Seriously delinquent rate (3) 3.51 % 1.33 % 3.37 % Past due 90 days or more and still accruing interest (4) $ — $ — $ — Mortgage loans on nonaccrual status (5) $ 12 $ — $ 12 ____________ (1) The difference between the recorded investment and the carrying value of total mortgage loans of $2 relates to accrued interest. (2) Includes mortgage loans where the decision of foreclosure or similar alternative, such as a pursuit of deed-in-lieu, has been reported. Mortgage loans in the process of foreclosure are included in past due or current mortgage loans depending on their delinquency status. (3) Mortgage loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total mortgage loan portfolio segment. (4) Mortgage loans insured or guaranteed by the Federal Housing Administration or the Department of Veterans Affairs. (5) Represents mortgage loans with contractual principal or interest payments 90 days or more past due and not accruing interest. The financial amounts related to the Bank’s impaired loans and troubled debt restructurings are not material to the Bank’s financial condition or results of operations for the periods presented.

Consolidated Obligations

Consolidated Obligations	3 Months Ended
Consolidated Obligations	Mar. 31, 2018
Debt Disclosure [Abstract]
Consolidated Obligations	Consolidated Obligations Consolidated obligations, consisting of consolidated obligation bonds and discount notes, are the joint and several obligations of the 11 Federal Home Loan Banks (FHLBanks) and are backed only by the financial resources of the FHLBanks. The Federal Home Loan Banks Office of Finance (Office of Finance) tracks the amount of debt issued on behalf of each FHLBank. In addition, the Bank separately tracks its specific portion of consolidated obligations for which it is the primary obligor and records it as a liability. Interest-rate Payment Terms. The following table presents the Bank’s consolidated obligation bonds by interest-rate payment type. As of March 31, 2018 As of December 31, 2017 Fixed-rate $ 21,235 $ 19,978 Step up/down 2,144 1,864 Simple variable-rate 53,999 65,760 Total par value $ 77,378 $ 87,602 Redemption Terms. The following table presents the Bank’s participation in consolidated obligation bonds outstanding by year of contractual maturity. As of March 31, 2018 As of December 31, 2017 Amount Weighted- average Interest Rate (%) Amount Weighted- average Interest Rate (%) Due in one year or less $ 58,157 1.63 $ 60,410 1.34 Due after one year through two years 9,028 1.77 17,826 1.41 Due after two years through three years 3,756 1.81 3,351 1.67 Due after three years through four years 1,290 1.75 1,287 1.72 Due after four years through five years 3,933 2.29 3,503 2.21 Due after five years 1,214 3.04 1,225 3.03 Total par value 77,378 1.73 87,602 1.43 Premiums 12 14 Discounts (11 ) (10 ) Hedging adjustments (219 ) (83 ) Total $ 77,160 $ 87,523 The following table presents the Bank’s consolidated obligation bonds outstanding by call feature. As of March 31, 2018 As of December 31, 2017 Noncallable $ 68,644 $ 79,847 Callable 8,734 7,755 Total par value $ 77,378 $ 87,602 The following table presents the Bank’s consolidated obligation bonds outstanding, by year of contractual maturity, or for callable consolidated obligation bonds, by next call date. As of March 31, 2018 As of December 31, 2017 Due or callable in one year or less $ 65,827 $ 66,715 Due or callable after one year through two years 8,003 17,071 Due or callable after two years through three years 2,117 2,362 Due or callable after three years through four years 515 612 Due or callable after four years through five years 378 308 Due or callable after five years 538 534 Total par value $ 77,378 $ 87,602 Consolidated Obligation Discount Notes. Consolidated obligation discount notes are issued to raise short-term funds and have original contractual maturities of up to one year . These consolidated obligation discount notes are issued at less than their face amounts and redeemed at par value when they mature. The following table presents the Bank’s participation in consolidated obligation discount notes. Book Value Par Value Weighted-average Interest Rate (%) As of March 31, 2018 $ 54,659 $ 54,794 1.60 As of December 31, 2017 $ 50,139 $ 50,217 1.21

Capital and Mandatorily Redeema

Capital and Mandatorily Redeemable Capital Stock	3 Months Ended
Capital and Mandatorily Redeemable Capital Stock	Mar. 31, 2018
Capital [Abstract]
Capital and Mandatorily Redeemable Capital Stock	Capital and Mandatorily Redeemable Capital Stock Capital. The following table presents the Bank’s compliance with the Federal Housing Finance Agency’s (Finance Agency) regulatory capital rules and requirements. As of March 31, 2018 As of December 31, 2017 Required Actual Required Actual Risk-based capital $ 1,619 $ 6,803 $ 1,581 $ 7,157 Total regulatory capital ratio 4.00 % 4.84 % 4.00 % 4.88 % Total regulatory capital (1) $ 5,618 $ 6,803 $ 5,863 $ 7,157 Leverage capital ratio 5.00 % 7.27 % 5.00 % 7.33 % Leverage capital $ 7,023 $ 10,204 $ 7,328 $ 10,736 ____________ (1) Total regulatory capital does not include accumulated other comprehensive income, but does include mandatorily redeemable capital stock. Mandatorily Redeemable Capital Stock. The following table presents the activity in mandatorily redeemable capital stock. For the Three Months Ended March 31, 2018 2017 Balance, beginning of period $ 1 $ 1 Net reclassification from capital during the period 32 8 Repurchase/redemption of mandatorily redeemable capital stock (30 ) (8 ) Balance, end of period $ 3 $ 1 The following table presents the amount of mandatorily redeemable capital stock by year of redemption. The year of redemption in the table is the end of the five -year redemption period, or with respect to activity-based stock, the later of the expiration of the five -year redemption period or the activity’s maturity date. As of March 31, 2018 As of December 31, 2017 Due in one year or less $ 2 $ 1 Due after two years through three years 1 — Total $ 3 $ 1

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	3 Months Ended
Accumulated Other Comprehensive Income	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income The following table present the components comprising accumulated other comprehensive income. Pension and Postretirement Benefits Noncredit Portion of Other-than- temporary Impairment Losses on Available-for- sale Securities Total Accumulated Other Comprehensive Income Balance, December 31, 2016 $ (20 ) $ 124 $ 104 Reclassification from accumulated other comprehensive income to net income: Amortization of pension and postretirement (1) 1 — 1 Net current period other comprehensive income 1 — 1 Balance, March 31, 2017 $ (19 ) $ 124 $ 105 Balance, December 31, 2017 $ (24 ) $ 134 $ 110 Other comprehensive income before reclassifications: Net change in fair value — (16 ) (16 ) Reclassification from accumulated other comprehensive income to net income: Amortization of pension and postretirement (1) 1 — 1 Net current period other comprehensive income (loss) 1 (16 ) (15 ) Balance, March 31, 2018 $ (23 ) $ 118 $ 95 ____________ (1)

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
Derivatives and Hedging Activities	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities Nature of Business Activity The Bank is exposed to interest-rate risk primarily from the effect of interest rate changes on its interest-earning assets and on its interest-bearing liabilities that finance these assets. To mitigate the risk of loss, the Bank has established policies and procedures, which include guidelines on the amount of exposure to interest rate changes that it is willing to accept. In addition, the Bank monitors the risk to its interest income, net interest margin, and average maturity of its interest-earning assets and funding sources. The goal of the Bank’s interest-rate risk management strategies is not to eliminate interest-rate risk, but to manage it within appropriate limits. The Bank enters into derivatives to manage the interest-rate risk exposure that is inherent in its otherwise unhedged assets and funding sources, to achieve the Bank’s risk management objectives, and to act as an intermediary between its members and counterparties. The Bank transacts most of its derivatives with large banks and major broker-dealers. Some of these banks and broker-dealers or their affiliates buy, sell, and distribute consolidated obligations. The Bank’s over-the-counter derivative transactions may either be (1) uncleared derivatives, which are executed bilaterally with a counterparty; or (2) cleared derivatives, which are cleared through a Futures Commission Merchant (clearing agent) with a Derivatives Clearing Organization (Clearinghouse). Once a derivatives transaction has been accepted for clearing by a Clearinghouse, the derivatives transaction is novated, and the executing counterparty is replaced with the Clearinghouse as the counterparty. The Bank is not a derivatives dealer and does not trade derivatives for short-term profit. For additional information on the Bank’s derivatives and hedging activities, see Note 17—Derivatives and Hedging Activities to the 2017 audited financial statements contained in the Bank’s Form 10-K. Financial Statement Effect and Additional Financial Information Derivative Notional Amounts. The notional amount of derivatives serves as a factor in determining periodic interest payments or cash flows received and paid. However, the notional amount of derivatives represents neither the actual amounts exchanged nor the overall exposure of the Bank to credit and market risk; the overall risk is much smaller. The risks of derivatives can be measured meaningfully on a portfolio basis that takes into account the counterparties, the types of derivatives, the items being hedged, and any offsets between the derivatives and the items being hedged. The following table presents the notional amount, fair value of derivative instruments (excluding fair value adjustments related to variation margin on daily settled contracts), and total derivative assets and liabilities. Total derivative assets and liabilities include the effect of netting adjustments, cash collateral, and variation margin for daily settled contracts. For purposes of this disclosure, the derivative values include the fair value of derivatives and the related accrued interest. As of March 31, 2018 As of December 31, 2017 Notional Amount of Derivatives Derivative Assets Derivative Liabilities Notional Amount of Derivatives Derivative Assets Derivative Liabilities Derivatives in hedging relationships: Interest-rate swaps (1) $ 44,747 $ 35 $ 167 $ 45,057 $ 198 $ 359 Derivatives not designated as hedging instruments: Interest-rate swaps (1) 955 2 13 876 9 9 Interest-rate caps or floors 11,083 6 4 13,000 2 1 Total derivatives not designated as hedging instruments 12,038 8 17 13,876 11 10 Total derivatives before netting and collateral adjustments $ 56,785 43 184 $ 58,933 209 369 Netting adjustments and cash collateral (2) 279 (162 ) 125 (348 ) Derivative assets and derivative liabilities $ 322 $ 22 $ 334 $ 21 ___________ (1) Includes variation margin for daily settled contracts of negative $79 and $107 as of March 31, 2018 and December 31, 2017 , respectively. (2) Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty and includes fair value adjustments on derivatives for which variation margin is characterized as a daily settled contract. Cash collateral posted and related accrued interest was $441 and $507 as of March 31, 2018 and December 31, 2017 , respectively. Cash collateral received and related accrued interest was less than $1 and $34 as of March 31, 2018 and December 31, 2017 , respectively. The following table presents the components of net gains on derivatives and hedging activities as presented on the Statements of Income. For the Three Months Ended March 31, 2018 2017 Derivatives and hedged items in fair value hedging relationships: Interest-rate swaps $ 19 $ 314 Derivatives not designated as hedging instruments: Interest-rate swaps 3 2 Interest-rate caps or floors 1 (1 ) Net interest settlements (1 ) (2 ) Total net gains (losses) related to derivatives not designated as hedging instruments 3 (1 ) Net gains on derivatives and hedging activities $ 22 $ 313 The following table presents, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair value hedging relationships and the impact of those derivatives on the Bank’s net interest income. For the Three Months Ended March 31, 2018 2017 Hedged Item Type Gains (Losses) on Derivative Gains (Losses) on Hedged Item Net Fair Value Effect of Derivatives on Net Interest Income (1) Gains (Losses) on Derivative Gains (Losses) on Hedged Item Net Fair Value Effect of Derivatives on Net Interest Income (1) Advances $ 337 $ (323 ) $ 14 $ (33 ) $ 425 $ (109 ) $ 316 $ (77 ) Consolidated obligations: Bonds (131 ) 136 5 4 (30 ) 28 (2 ) 32 Discount notes — — — (1 ) 3 (3 ) — (3 ) Total $ 206 $ (187 ) $ 19 $ (30 ) $ 398 $ (84 ) $ 314 $ (48 ) ____________ (1) The net interest on derivatives in fair value hedge relationships is presented in the interest income or expense line item of the respective hedged item. Managing Credit Risk on Derivatives The Bank is subject to credit risk to its derivative transactions due to the risk of nonperformance by counterparties and manages this risk through credit analysis, collateral requirements, and adherence to the requirements set forth in its policies, U.S. Commodity Futures Trading Commission regulations, and Finance Agency regulations. For uncleared derivatives, the degree of credit risk depends on the extent to which master netting arrangements are included in such contracts to mitigate the risk. The Bank requires collateral agreements with collateral delivery thresholds on all uncleared derivatives. Additionally, collateral related to derivatives with member institutions includes collateral assigned to the Bank, as evidenced by a written security agreement, and held by the member institution for the benefit of the Bank. Certain of the Bank’s uncleared derivative instruments contain provisions that require the Bank to post additional collateral with its counterparties if there is deterioration in the Bank’s credit rating. If the Bank’s credit rating is lowered by a nationally recognized statistical rating organization, the Bank may be required to deliver additional collateral on uncleared derivative instruments in net liability positions. The aggregate fair value of all uncleared derivative instruments with credit-risk-related contingent features that were in a net liability position (before cash collateral and related accrued interest) as of March 31, 2018 was $7 , for which the Bank had no collateral posted as of March 31, 2018 . If the Bank’s credit ratings had been lowered from its current rating to the next lower rating that would have triggered additional collateral to be delivered, the Bank would have been required to deliver an additional $2 of collateral at fair value to its uncleared derivative counterparties as of March 31, 2018 . For cleared derivatives, the Clearinghouse is the Bank’s counterparty. The Clearinghouse notifies the clearing agent of the required initial and variation margin, and the clearing agent notifies the Bank. The Bank currently utilizes the following two Clearinghouses for all cleared derivative transactions: LCH Ltd. and CME Clearing. Effective January 3, 2017, CME Clearing made certain amendments to its rulebook changing the legal characterization of variation margin payments to be daily settled payments, rather than collateral. Similarly, beginning January 16, 2018, variation margin for all LCH Ltd. derivative transactions were considered daily settled payments. Variation margin on daily settled contracts is netted directly against the derivative’s gross recognized amount. At both Clearinghouses, initial margin is considered cash collateral. Because the Bank is required to post initial and variation margin through the clearing agent to the Clearinghouse, it exposes the Bank to institutional credit risk if the clearing agent or the Clearinghouse fails to meet its obligations. The use of cleared derivatives is intended to mitigate credit risk exposure because a central counterparty is substituted for individual counterparties, and collateral/payments is posted daily through a clearing agent for changes in the fair value of cleared derivatives. The Bank has analyzed the enforceability of offsetting rights incorporated in its cleared derivative transactions and determined that the exercise of those offsetting rights by a non-defaulting party under these transactions should be upheld under applicable law upon an event of default, including a bankruptcy, insolvency, or similar proceeding involving the Clearinghouse or the Bank’s clearing agent, or both. Based on this analysis, the Bank presents a net derivative receivable or payable for all of its transactions through a particular clearing agent with a particular Clearinghouse. The Bank presents derivative instruments and the related cash collateral (including initial and certain variation margin) that is received or pledged, plus the associated accrued interest, on a net basis by clearing agent and/or by counterparty when it has met the netting requirements. The following table presents the fair value of derivative instruments meeting or not meeting netting requirements, including the related collateral received from or pledged to counterparties. As of March 31, 2018 As of December 31, 2017 Derivative Assets Derivative Liabilities Derivative Assets Derivative Liabilities Gross recognized amount: Uncleared derivatives $ 41 $ 175 $ 19 $ 106 Cleared derivatives 2 9 190 263 Total gross recognized amount 43 184 209 369 Gross amounts of netting adjustments and cash collateral: Uncleared derivatives (39 ) (153 ) (17 ) (85 ) Cleared derivatives 318 (9 ) 142 (263 ) Total gross amounts of netting adjustments and cash collateral: 279 (162 ) 125 (348 ) Net amounts after netting adjustments and cash collateral: Uncleared derivatives 2 22 2 21 Cleared derivatives 320 — 332 — Total net amounts after netting adjustments and cash collateral 322 22 334 21 Non-cash collateral received or pledged not offset-cannot be sold or repledged: (1) Uncleared derivatives — — — — Cleared derivatives — — — — Total cannot be sold or repledged (1) — — — — Net unsecured amounts: (1) Uncleared derivatives 2 22 2 21 Cleared derivatives 320 — 332 — Total net unsecured amount (1) $ 322 $ 22 $ 334 $ 21 ____________ (1) The Bank had net credit exposure of $1 and $226 as of March 31, 2018 and December 31, 2017

Estimated Fair Values

Estimated Fair Values	3 Months Ended
Estimated Fair Values	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Estimated Fair Values	Estimated Fair Values The Bank records trading securities, available-for-sale securities, derivative assets and liabilities, and grantor trust assets (publicly-traded mutual funds) at estimated fair value on a recurring basis. Fair value is defined under GAAP as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The transaction to sell the asset or transfer the liability is a hypothetical transaction at the measurement date, considered from the perspective of a market participant that holds the asset or owes the liability. In general, the transaction price will equal the exit price and therefore, represents the fair value of the asset or liability at initial recognition. In determining whether a transaction price represents the fair value of the asset or liability at initial recognition, each reporting entity is required to consider factors specific to the transaction, the asset or liability, the principal or most advantageous market for the asset or liability, and market participants with whom the entity would transact in the market. A fair value hierarchy is used to prioritize the inputs of valuation techniques used to measure fair value. The inputs are evaluated, and an overall level for the fair value measurement is determined. This overall level is an indication of how market-observable the fair value measurement is and defines the level of disclosure. In order to determine the fair value or the exit price, entities must determine the unit of account, highest and best use, principal market, and market participants. These determinations allow the reporting entity to define the inputs for fair value and level of hierarchy. Outlined below is the application of the “fair value hierarchy” to the Bank’s financial assets and liabilities that are carried at fair value or disclosed in the notes to the financial statements. Level 1 - inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets. An active market for the asset or liability is a market in which the transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. The Bank carried grantor trust assets at fair value hierarchy Level 1 as of March 31, 2018 and December 31, 2017 . Level 2 - inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. The Bank carried trading securities and derivatives at fair value hierarchy Level 2 as of March 31, 2018 and December 31, 2017 . Level 3 - inputs to the valuation methodology are unobservable and significant to the fair value measurement. Unobservable inputs are supported by limited market activity and reflect the entity’s own assumptions. The Bank carried available-for-sale securities at fair value hierarchy Level 3 as of March 31, 2018 and December 31, 2017 . The Bank utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. For financial instruments carried at fair value, the Bank reviews the fair value hierarchy classification of financial assets and liabilities on a quarterly basis. Changes in the observability of the valuation attributes may result in a reclassification of certain financial assets or liabilities within the fair value hierarchy. Such reclassifications are reported as transfers in/out at fair value as of the beginning of the quarter in which the changes occur. There were no such transfers during the periods presented. Estimated Fair Value Measurements on a Recurring Basis. The following tables present, for each fair value hierarchy level, the Bank’s financial assets and liabilities that are measured at fair value on a recurring basis on its Statements of Condition. As of March 31, 2018 Fair Value Measurements Using Netting Adjustments and Cash Collateral (1) Level 1 Level 2 Level 3 Total Assets Trading securities: Government-sponsored enterprises debt obligations $ — $ 55 $ — $ — $ 55 Available-for-sale securities: Private-label residential MBS — — 1,053 — 1,053 Derivative assets: Interest-rate related — 43 — 279 322 Grantor trust (included in Other assets) 49 — — — 49 Total assets at fair value $ 49 $ 98 $ 1,053 $ 279 $ 1,479 Liabilities Derivative liabilities: Interest-rate related $ — $ 184 $ — $ (162 ) $ 22 Total liabilities at fair value $ — $ 184 $ — $ (162 ) $ 22 ____________ (1) Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty. As of December 31, 2017 Fair Value Measurements Using Netting Adjustments and Cash Collateral (1) Level 1 Level 2 Level 3 Total Assets Trading securities: Government-sponsored enterprises debt obligations $ — $ 56 $ — $ — $ 56 Available-for-sale securities: Private-label residential MBS — — 1,104 — 1,104 Derivative assets: Interest-rate related — 209 — 125 334 Grantor trust (included in Other assets) 48 — — — 48 Total assets at fair value $ 48 $ 265 $ 1,104 $ 125 $ 1,542 Liabilities Derivative liabilities: Interest-rate related $ — $ 369 $ — $ (348 ) $ 21 Total liabilities at fair value $ — $ 369 $ — $ (348 ) $ 21 ____________ (1) Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty. The following table presents a reconciliation of available-for-sale securities that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3). For the Three Months Ended March 31, 2018 2017 Balance, beginning of period $ 1,104 $ 1,345 Total (losses) gains realized and unrealized: (1) Included in other comprehensive income (16 ) — Accretion of credit losses in net interest income 16 15 Settlements (51 ) (71 ) Balance, end of period $ 1,053 $ 1,289 ____________ (1) Related to available-for-sale securities held at period end. Described below are the Bank’s fair value measurement methodologies for financial assets and liabilities that are measured at fair value on a recurring or nonrecurring basis on the Statements of Condition and categorized within Level 2 and Level 3 of the fair value hierarchy. Investment securities . The Bank obtains prices from multiple designated third-party pricing vendors, when available, to estimate the fair value of its investment securities. The pricing vendors use various proprietary models to price investment securities. The inputs to those models are derived from various sources including, but not limited to, the following: benchmark yields, reported trades, dealer estimates, issuer spreads, benchmark securities, bids, offers, and other market-related data. Since many investment securities do not trade on a daily basis, the pricing vendors use available information as applicable, such as benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing to determine the prices for individual securities. Each pricing vendor has an established challenge process in place for all investment securities valuations, which facilitates resolution of potentially erroneous prices identified by the Bank. The Bank periodically conducts reviews of its pricing vendors to confirm and further augment its understanding of the vendors’ pricing processes, methodologies, and control procedures for U.S. agency and private-label MBS. The Bank’s valuation technique for estimating the fair value of its investment securities first requires the establishment of a “median” price for each security. All prices that are within a specified tolerance threshold of the median price are included in the “cluster” of prices that are averaged to compute a “resultant” price. All prices that are outside the threshold (“outliers”) are subject to further analysis (including, but not limited to, comparison to prices provided by an additional third-party valuation service, prices for similar securities, and/or non-binding dealer estimates) to determine if an outlier is a better estimate of fair value. If an outlier (or some other price identified in the analysis) is determined to be a better estimate of fair value, then the outlier (or the other price as appropriate) is used as the final price rather than the resultant price. Alternatively, if the analysis does not provide evidence that an outlier is more representative of the fair value, and the resultant price is the best estimate, then the resultant price is used as the final price. In all cases, the final price is used to determine the fair value of the security. If all prices received for a security are outside the tolerance threshold level of the median price, then there is no resultant price, and the final price is determined by an evaluation of all outlier prices as described above. Multiple third-party vendor prices were received for a majority of the Bank’s investment securities holdings, and the final prices for those securities were computed by averaging the prices received as of March 31, 2018 and December 31, 2017 . Based on the Bank’s review of the pricing methods and controls employed by the third-party pricing vendors and the relative lack of dispersion among the vendor prices (or the Bank’s additional analysis in those instances in which there were outliers or significant yield variances), the Bank believes that its final prices are representative of the prices that would have been received if the assets had been sold at the measurement date (i.e., exit prices) and further, that the fair value measurements are classified appropriately in the fair value hierarchy. Based on the lack of significant market activity for private-label MBS, the fair value measurement for those securities were classified as Level 3 within the fair value hierarchy as of March 31, 2018 and December 31, 2017 . Derivative assets and liabilities. The Bank calculates the fair values of interest-rate related derivatives using a discounted cash flow analysis which utilizes market-observable inputs. The inputs for interest-rate related derivatives uses the Overnight Index Swap curve for collateralized derivatives. Derivative instruments are transacted primarily in the institutional dealer market and priced with observable market assumptions at a mid-market valuation point. The Bank does not provide a credit valuation adjustment based on aggregate exposure by derivative counterparty when measuring the fair value of its derivatives. This is because the collateral provisions pertaining to the Bank’s derivatives obviate the need to provide such a credit valuation adjustment. The fair values of the Bank’s derivatives take into consideration the effects of legally enforceable master netting agreements, where applicable, that allow the Bank to settle positive and negative positions and offset cash collateral with the same counterparty on a net basis. The Bank and each uncleared derivative counterparty have collateral thresholds that take into account both the Bank’s and the counterparty’s credit ratings. As a result of these practices and agreements, the Bank has concluded that the impact of the credit differential between the Bank and its derivative counterparties was mitigated to an immaterial level, and no further adjustments were deemed necessary to the recorded fair values of derivative assets and liabilities on the Statements of Condition as of March 31, 2018 and December 31, 2017 . The following estimated fair value amounts have been determined by the Bank using available market information and the Bank’s best judgment of appropriate valuation methods. These estimates are based on pertinent information available to the Bank as of March 31, 2018 and December 31, 2017 . Although the Bank uses its best judgment in estimating the fair values of these financial instruments, there are inherent limitations in any estimation technique or valuation methodology. For example, because an active secondary market does not exist for a portion of the Bank’s financial instruments, in certain cases, fair values are not subject to precise quantification or verification and may change as economic and market factors and evaluation of those factors change. Therefore, these estimated fair values are not necessarily indicative of the amounts that would be realized in current market transactions although they do reflect the Bank’s judgment of how a market participant would estimate the fair value. The fair value tables presented below do not represent an estimate of the overall fair value of the Bank as a going concern, which would take into account future business opportunities and the net profitability of assets versus liabilities. The following tables present the carrying values and estimated fair values of the Bank’s financial instruments. As of March 31, 2018 Estimated Fair Value Carrying Value Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets: Cash and due from banks $ 80 $ 80 $ 80 $ — $ — $ — Interest-bearing deposits 2,717 2,717 — 2,717 — — Securities purchased under agreements to resell 6,000 6,000 — 6,000 — — Federal funds sold 10,728 10,728 — 10,728 — — Trading securities 55 55 — 55 — — Available-for-sale securities 1,053 1,053 — — 1,053 — Held-to-maturity securities 26,930 26,951 — 26,412 539 — Advances 91,733 91,742 — 91,742 — — Mortgage loans held for portfolio, net 416 442 — 442 — — Accrued interest receivable 235 235 — 235 — — Derivative assets 322 322 — 43 — 279 Grantor trust assets (included in Other assets) 49 49 49 — — — Liabilities: Interest-bearing deposits 1,213 1,213 — 1,213 — — Consolidated obligations, net: Discount notes 54,659 54,652 — 54,652 — — Bonds 77,160 77,150 — 77,150 — — Mandatorily redeemable capital stock 3 3 3 — — — Accrued interest payable 144 144 — 144 — — Derivative liabilities 22 22 — 184 — (162 ) ____________ (1) Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty. As of December 31, 2017 Estimated Fair Value Carrying Value Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets: Cash and due from banks $ 2,357 $ 2,357 $ 2,357 $ — $ — $ — Interest-bearing deposits 2,176 2,176 — 2,176 — — Securities purchased under agreements to resell 2,500 2,500 — 2,500 — — Federal funds sold 9,380 9,380 — 9,380 — — Trading securities 56 56 — 56 — — Available-for-sale securities 1,104 1,104 — — 1,104 — Held-to-maturity securities 25,162 25,219 — 24,643 576 — Advances 102,440 102,446 — 102,446 — — Mortgage loans held for portfolio, net 435 467 — 467 — — Loan to another FHLBank 200 200 — 200 — — Accrued interest receivable 208 208 — 208 — — Derivative assets 334 334 — 209 — 125 Grantor trust assets (included in Other assets) 48 48 48 — — — Liabilities: Interest-bearing deposits 1,177 1,177 — 1,177 — — Consolidated obligations, net: Discount notes 50,139 50,132 — 50,132 — — Bonds 87,523 87,501 — 87,501 — — Mandatorily redeemable capital stock 1 1 1 — — — Accrued interest payable 142 142 — 142 — — Derivative liabilities 21 21 — 369 — (348 ) ____________ (1)

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Consolidated obligations are backed only by the financial resources of the FHLBanks. At any time, the Finance Agency may require any FHLBank to make principal or interest payments due on any consolidated obligation, whether or not the primary obligor FHLBank has defaulted on the payment of that obligation. No FHLBank has ever had to assume or pay the consolidated obligation of another FHLBank. The par value of the other FHLBanks’ outstanding consolidated obligations for which the Bank is jointly and severally liable was $887,057 and $896,441 as of March 31, 2018 and December 31, 2017 , respectively, exclusive of the Bank’s own outstanding consolidated obligations. None of the other FHLBanks defaulted on their consolidated obligations, the Finance Agency was not required to allocate any obligation among the FHLBanks, and no amount of the joint and several obligation was fixed as of March 31, 2018 and December 31, 2017 . Accordingly, the Bank has not recognized a liability for its joint and several obligation related to the other FHLBanks’ consolidated obligations as of March 31, 2018 and December 31, 2017 . The following table presents the Bank’s outstanding commitments, which represent off-balance sheet obligations. As of March 31, 2018 As of December 31, 2017 Expire Within One Year Expire After One Year Total Expire Within One Year Expire After One Year Total Standby letters of credit (1) $ 10,490 $ 16,784 $ 27,274 $ 9,520 $ 20,669 $ 30,189 Unsettled consolidated obligation bonds, at par (2) 95 — 95 3 — 3 ____________ (1) “Expire Within One Year” includes 16 standby letters of credit for a total of $64 and 16 standby letters of credit for a total of $59 as of March 31, 2018 and December 31, 2017 , respectively, that have no stated maturity date and are subject to renewal on an annual basis. (2) Expiration is based on settlement period rather than underlying contractual maturity of consolidated obligations. The Bank monitors the creditworthiness of its standby letters of credit based on an evaluation of the member. In addition, standby letters of credit are fully collateralized from the time of issuance. The Bank has established parameters for the measurement, review, classification, and monitoring of credit risk related to these standby letters of credit that result in an internal credit rating, which focuses primarily on an institution’s overall financial health and takes into account the quality of assets, earnings, and capital position. In general, borrowers categorized into the highest risk rating category have more restrictions on the types of collateral that they may use to secure standby letters of credit, may be required to maintain higher collateral maintenance levels and deliver loan collateral, and may face more stringent collateral reporting requirements. The carrying value of the guarantees related to standby letters of credit is recorded in “Other liabilities” on the Statements of Condition and amounted to $91 and $119 as of March 31, 2018 and December 31, 2017 , respectively. Based on the Bank’s credit analyses and collateral requirements, the Bank does not deem it necessary to record any additional liability on the Statements of Condition for these commitments. The Bank may enter into commitments that unconditionally obligate it to purchase mortgage loans. Commitments are generally for periods not exceeding 91 days . Delive ry commitments are recorded at fair value as “Derivative assets” or “Derivative liabilities” on the Statements of Condition.

Transactions With Shareholders

Transactions With Shareholders	3 Months Ended
Transactions With Shareholders	Mar. 31, 2018
Transactions With Shareholders [Abstract]
Transactions With Shareholders	Transactions with Shareholders The Bank is a cooperative whose member institutions own substantially all of the capital stock of the Bank. Former members and certain non-members, which own the Bank’s capital stock as a result of a merger or acquisition of a member of the Bank, own the remaining capital stock to support business transactions still carried on the Bank’s Statements of Condition. All holders of the Bank’s capital stock receive dividends on their investments, to the extent declared by the Bank’s board of directors. All advances are issued to members and eligible housing associates under the Federal Home Loan Bank Act of 1932, as amended (FHLBank Act), and mortgage loans held for portfolio are purchased from members. The Bank also maintains demand deposit accounts primarily to facilitate settlement activities that are related directly to advances and mortgage loan purchases. Transactions with any member that has an officer or director who is also a director of the Bank are subject to the same Bank policies as transactions with other members. Related Parties. In accordance with GAAP, financial statements are required to disclose material related-party transactions other than compensation arrangements, expense allowances, or other similar items that occur in the ordinary course of business. Under GAAP, related parties include owners of more than 10 percent of the voting interests of the Bank. Due to limits on member voting rights under the FHLBank Act and Finance Agency regulations, no member owned more than 10 percent of the total voting interests. Therefore, the Bank had no such related party transactions required to be disclosed for the periods presented. Shareholder Concentrations. The Bank considers shareholder concentration as members or non-members with regulatory capital stock outstanding in excess of 10 percent of the Bank’s total regulatory capital stock. The following tables present transactions with shareholders whose holdings of regulatory capital stock exceed 10 percent of total regulatory capital stock outstanding. As of March 31, 2018 Regulatory Capital Stock Outstanding Percent of Total Regulatory Capital Stock Outstanding Par Value of Advances Percent of Total Par Value of Advances Interest-bearing Deposits Percent of Total Interest-bearing Deposits Bank of America, National Association $ 1,227 25.82 $ 28,510 31.03 $ — 0.01 As of December 31, 2017 Regulatory Capital Stock Outstanding Percent of Total Regulatory Capital Stock Outstanding Par Value of Advances Percent of Total Par Value of Advances Interest-bearing Deposits Percent of Total Interest-bearing Deposits Bank of America, National Association $ 908 17.61 $ 21,010 20.55 $ — 0.01 Navy Federal Credit Union 675 13.09 15,530 15.19 195 16.58

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Accounting [Text Block]	The accompanying unaudited interim financial statements of the Federal Home Loan Bank of Atlanta (Bank) have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). To prepare the financial statements in conformity with GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and income and expenses during the reporting period. Actual results could be different from these estimates. The foregoing interim financial statements are unaudited; however, in the opinion of management, all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of the results for the interim periods, have been included. The results of operations for interim periods are not necessarily indicative of results to be expected for the year ending December 31, 2018 , or for other interim periods. The unaudited interim financial statements should be read in conjunction with the audited financial statements for the year ended December 31, 2017 , which are contained in the Bank’s 2017 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on March 8, 2018 (Form 10-K). The Bank has certain financial instruments, including derivative instruments and securities purchased under agreements to resell, that are subject to offset under master netting arrangements or by operation of law. Additional information regarding derivative instruments is provided in Note 13 — Derivatives and Hedging Activities to the Bank’s interim financial statements. The Bank does not have any offsetting liabilities related to its securities purchased under agreements to resell for the periods presented. Based on the fair value of the related securities held as collateral, the securities purchased under agreements to resell were fully collateralized for the periods presented. Refer to Note 2 — Summary of Significant Accounting Policies to the Bank’s 2017 audited financial statements for a description of all the Bank’s significant accounting policies. There have been no changes to these policies as of March 31, 2018
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Guidance Targeted Improvements to Accounting for Hedging Activities. In August 2017, the Financial Accounting Standards Board (FASB) issued amended guidance intended to better portray the economic results of an entity’s risk management activities in its financial statements. This guidance requires that, for fair value hedges, the entire change in the fair value of the hedging instrument included in the assessment of hedge effectiveness be presented in the same income statement line item that is used to present the earnings effect of the hedged item. In addition, the amendments permit (1) measuring the change in fair value of the hedged item on the basis of the benchmark rate component of the contractual coupon cash flows determined at hedged inception; (2) measuring the hedged item in a partial-term fair value hedge of interest-rate risk by assuming that the hedged item has a term that reflects only the designated cash flows being hedged; and (3) considering only how changes in the benchmark interest rate affect a decision to settle a prepayable instrument before its scheduled maturity in calculating the change in the fair value of the hedged item attributable to interest-rate risk. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2018. Early application is permitted although the Bank does not intend to adopt this guidance early. The amended presentation and disclosure guidance will be applied prospectively. The Bank is in the process of evaluating this guidance, and its impact on the Bank’s financial condition and results of operations has not yet been determined. Premium Amortization on Purchased Callable Debt Securities. In March 2017, the FASB issued guidance intended to better align the amortization period of callable debt securities held at a premium to expectations incorporated in market pricing on the underlying securities. This guidance shortens the amortization period for certain callable debt securities held at a premium by requiring that the premium be amortized to the earliest call date. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2018. Early application is permitted although the Bank does not intend to adopt this guidance early. This guidance will be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the fiscal year in which this guidance is adopted. The Bank is in the process of evaluating this guidance, but this guidance is not expected to have a material impact on the Bank’s financial condition or results of operations. Measurement of Credit Losses on Financial Instruments. In June 2016, the FASB issued guidance intended to improve the timeliness of recording credit losses on loans and other financial instruments held by financial institutions and other organizations. This guidance requires all expected credit losses for financial assets that are held at the reporting date to be measured based on historical experience, current conditions, and reasonable and supportable forecasts. Credit losses related to available-for-sale securities will be recorded through an allowance for credit losses. Additionally, this guidance amends the accounting for purchased financial assets with credit deterioration and requires enhanced disclosures that provide additional information to help financial statement users better understand significant estimates and judgments. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2019. Early application is permitted for the interim and annual periods beginning after December 15, 2018, although the Bank does not intend to adopt this guidance early. While the Bank is in the process of evaluating this guidance, its adoption may result in an increase in the allowance for credit losses, but its impact on the Bank’s financial condition and results of operations will depend upon the composition of the financial assets held by the Bank at the adoption date, as well as the economic conditions and forecasts at that time. Leases. In February 2016, the FASB issued guidance on accounting for leases and disclosure of key information about leasing arrangements. This guidance requires lessees to recognize the following for all operating and finance leases at the commencement date: (1) a lease liability, which is the obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset representing the lessee’s right to use, or control the use of, the underlying asset for the lease term. A lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities for short-term leases with a term of 12 months or less. This guidance does not fundamentally change lessor accounting; however, some changes have been made to align that guidance with the lessee guidance and other areas within GAAP. This guidance becomes effective for the Bank for the interim and annual periods beginning after December 15, 2018. Early application is permitted although the Bank does not intend to adopt this guidance early. This guidance will be applied on a modified retrospective basis for leases existing at, or entered into after, the earliest period presented in the financial statements. The adoption of this guidance is not expected to have a material impact on the Bank’s financial condition or results of operations. Recently Adopted Accounting Guidance Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. In March 2017, the FASB issued guidance intended to improve the presentation of net periodic pension and postretirement benefit costs. This guidance requires an employer to report the service cost component in the same line item as compensation costs on the income statement, while the other components of net benefit cost are required to be presented separately from the service cost component. Additionally, this guidance only allows the service cost component to be eligible for capitalization, when applicable. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2018. For the presentation of the service cost component and the other components of net benefit cost on the income statement, this guidance was applied retrospectively. For the capitalization of the service cost component of net benefit cost in assets, this guidance was applied prospectively on and after the effective date. The adoption of this guidance did not have a material impact on the Bank's financial condition or results of operations. Classification of Certain Cash Receipts and Cash Payments. In August 2016, the FASB issued guidance intended to reduce diversity in practice in how cash receipts and cash payments are presented and classified on the Statements of Cash Flows for certain transactions. This guidance was adopted on a retrospective basis and became effective for the Bank beginning on January 1, 2018. The disclosure of cash paid for interest as reported in the supplemental disclosures of cash flow information increased by $68 for the three months ended March 31, 2017 and relates to accreted interest on zero-interest debt instruments. The adoption of this guidance did not have an impact on the Bank’s financial condition, results of operations, or cash flows. Recognition and Measurement of Financial Assets and Financial Liabilities. In January 2016, the FASB issued guidance designed to improve the recognition, measurement, presentation, and disclosure of financial instruments through targeted changes to existing GAAP. This guidance requires, among other things, the following: (1) use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (2) separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (i.e., securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and (3) separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk (also referred to as “own credit”) when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments. Additionally, these changes eliminate the requirement to disclose the method and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. This guidance became effective for the Bank for the interim and annual periods beginning on January 1, 2018. The adoption of this guidance did not have an impact on the Bank’s financial condition or results of operations. Revenue from Contracts with Customers.

Trading Securities (Tables)

Trading Securities (Tables) - Categories of Investments, Marketable Securities, Trading Securities [Member]	3 Months Ended
	Mar. 31, 2018
Schedule of Trading Securities and Other Trading Assets [Line Items]
Schedule of Major Trading Securities	Major Security Types. The following table presents trading securities. As of March 31, 2018 As of December 31, 2017 Government-sponsored enterprises debt obligations $ 55 $ 56
Schedule of Net Losses on Trading Securities	The following table presents net losses on trading securities. For the Three Months Ended March 31, 2018 2017 Net losses on trading securities held at period end $ (1 ) $ (2 )

Available-for-sale Securities (

Available-for-sale Securities (Tables)	3 Months Ended
Available-for-sale Securities (Tables)	Mar. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale Securities Reconciliation	Major Security Type. The following table presents information on private-label residential mortgage-backed securities (MBS) that are classified as available-for-sale. Amortized Cost Other-than-temporary Impairment Recognized in Accumulated Other Comprehensive Income (1) Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of March 31, 2018 $ 935 $ 1 $ 119 $ — $ 1,053 As of December 31, 2017 $ 970 $ 1 $ 135 $ — $ 1,104 ____________ (1) Amounts represent the non-credit portion of an other-than-temporary impairment during the life of the security.
Summary of Available-for-Sale MBS Issued by Members or Affiliates of Members	The following table presents private-label residential MBS that are classified as available-for-sale and issued by members or affiliates of members, all of which have been issued by Bank of America Corporation, Charlotte, NC. Amortized Cost Other-than-temporary Impairment Recognized in Accumulated Other Comprehensive Income Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of March 31, 2018 $ 620 $ — $ 91 $ — $ 711 As of December 31, 2017 $ 638 $ 1 $ 104 $ — $ 741
Categories of Investments, Marketable Securities, Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale Securities with Unrealized Losses	The following table presents private-label residential MBS that are classified as available-for-sale with unrealized losses. The unrealized losses are aggregated by the length of time that the individual securities have been in a continuous unrealized loss position. Less than 12 Months 12 Months or More Total Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses As of March 31, 2018 — $ — $ — 3 $ 9 $ 1 3 $ 9 $ 1 As of December 31, 2017 1 $ 7 $ 1 1 $ 4 $ — 2 $ 11 $ 1

Held-to-maturity Securities (Ta

Held-to-maturity Securities (Tables) - Held-to-maturity Securities [Member]	3 Months Ended
	Mar. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Schedule of Held-to-Maturity Securities	Major Security Types. The following table presents held-to-maturity securities. As of March 31, 2018 As of December 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value State or local housing agency debt obligations $ 1 $ — $ — $ 1 $ 1 $ — $ — $ 1 Government-sponsored enterprises debt obligations 4,862 7 5 4,864 5,350 8 6 5,352 Mortgage-backed securities: U.S. agency obligations-guaranteed residential 146 2 — 148 157 2 — 159 Government-sponsored enterprises residential 10,136 63 51 10,148 9,357 65 24 9,398 Government-sponsored enterprises commercial 11,253 11 13 11,251 9,729 16 12 9,733 Private-label residential 532 8 1 539 568 8 — 576 Total $ 26,930 $ 91 $ 70 $ 26,951 $ 25,162 $ 99 $ 42 $ 25,219
Schedule of Unrealized Loss on Investments	The following tables present held-to-maturity securities with unrealized losses. The unrealized losses are aggregated by major security type and by the length of time that the individual securities have been in a continuous unrealized loss position. As of March 31, 2018 Less than 12 Months 12 Months or More Total Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses State or local housing agency debt obligations 1 $ 1 $ — — $ — $ — 1 $ 1 $ — Government-sponsored enterprises debt obligations 8 618 1 5 1,496 4 13 2,114 5 Mortgage-backed securities: Government-sponsored enterprises residential 18 1,976 33 39 1,091 18 57 3,067 51 Government-sponsored enterprises commercial 49 3,197 4 6 901 9 55 4,098 13 Private-label residential 12 50 1 11 34 — 23 84 1 Total 88 $ 5,842 $ 39 61 $ 3,522 $ 31 149 $ 9,364 $ 70 As of December 31, 2017 Less than 12 Months 12 Months or More Total Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses Number of Positions Estimated Fair Value Gross Unrealized Losses State or local housing agency debt obligations 1 $ 1 $ — — $ — $ — 1 $ 1 $ — Government-sponsored enterprises debt obligations 6 996 1 5 1,495 5 11 2,491 6 Mortgage-backed securities: Government-sponsored enterprises residential 12 1,466 11 40 1,154 13 52 2,620 24 Government-sponsored enterprises commercial 16 1,209 5 7 1,029 7 23 2,238 12 Private-label residential 7 19 — 16 70 — 23 89 — Total 42 $ 3,691 $ 17 68 $ 3,748 $ 25 110 $ 7,439 $ 42
Amortized Cost and Estimated Fair Value of Held-to-Maturity Securities by Contractual Maturity	Redemption Terms. The following table presents the amortized cost and estimated fair value of held-to-maturity securities by contractual maturity. MBS are not presented by contractual maturity because their actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment fees. As of March 31, 2018 As of December 31, 2017 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Non-mortgage-backed securities: Due in one year or less $ 2,325 $ 2,323 $ 2,913 $ 2,909 Due after one year through five years 2,072 2,073 1,972 1,975 Due after five years through 10 years 406 409 406 409 Due after 10 years 60 60 60 60 Total non-mortgage-backed securities 4,863 4,865 5,351 5,353 Mortgage-backed securities 22,067 22,086 19,811 19,866 Total $ 26,930 $ 26,951 $ 25,162 $ 25,219
Held-to-Maturity MBS Issued by Members or Affiliates of Members	The following table presents private-label residential MBS that are classified as held-to-maturity and issued by members or affiliates of members, all of which have been issued by Bank of America Corporation, Charlotte, NC. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of March 31, 2018 $ 116 $ 1 $ — $ 117 As of December 31, 2017 $ 125 $ 1 $ — $ 126

Other-than-Temporary Impairme28

Other-than-Temporary Impairment (Tables)	3 Months Ended
Other-than-Temporary Impairment (Tables)	Mar. 31, 2018
Other than Temporary Impairment Losses, Investments [Abstract]
Schedule of Roll-Forward Cumulative Credit Losses Recognized	The following table presents a roll-forward of the amount of credit losses on the Bank’s investment securities recognized in earnings during the life of the securities for which a portion of the other-than-temporary loss was recognized in accumulated other comprehensive income. For the Three Months Ended March 31, 2018 2017 Balance, beginning of period $ 394 $ 455 Increase in cash flows expected to be collected, (accreted as interest income over the remaining lives of the applicable securities) (16 ) (15 ) Balance, end of period $ 378 $ 440

Advances (Tables)

Advances (Tables)	3 Months Ended
Advances (Tables)	Mar. 31, 2018
Advances [Abstract]
Federal Home Loan Bank, Advances	Redemption Terms. The following table presents the Bank’s advances outstanding by year of contractual maturity. As of March 31, 2018 As of December 31, 2017 Due in one year or less 60,276 60,795 Due after one year through two years 10,214 10,779 Due after two years through three years 6,497 14,210 Due after three years through four years 3,213 4,162 Due after four years through five years 4,088 3,729 Due after five years 7,584 8,574 Total par value 91,872 102,249 Discount on AHP (1) advances (4 ) (4 ) Discount on EDGE (2) advances (2 ) (3 ) Hedging adjustments (133 ) 198 Total $ 91,733 $ 102,440 ___________ (1) The Affordable Housing Program (2) The Economic Development and Growth Enhancement Program The following table presents advances by year of contractual maturity or, for convertible advances, next conversion date. As of March 31, 2018 As of December 31, 2017 Due or convertible in one year or less 60,669 60,984 Due or convertible after one year through two years 10,380 10,846 Due or convertible after two years through three years 6,530 14,326 Due or convertible after three years through four years 3,233 4,184 Due or convertible after four years through five years 4,061 3,695 Due or convertible after five years 6,999 8,214 Total par value $ 91,872 $ 102,249 Interest-rate Payment Terms. The following table presents interest-rate payment terms for advances. As of March 31, 2018 As of December 31, 2017 Fixed-rate: Due in one year or less $ 41,147 $ 37,107 Due after one year 21,376 22,044 Total fixed-rate 62,523 59,151 Variable-rate: Due in one year or less 19,130 23,687 Due after one year 10,219 19,411 Total variable-rate 29,349 43,098 Total par value $ 91,872 $ 102,249

Mortgage Loans Held for Portf30

Mortgage Loans Held for Portfolio (Tables)	3 Months Ended
Mortgage Loans Held for Portfolio (Tables)	Mar. 31, 2018
Mortgage Loans on Real Estate [Abstract]
Mortgage Loans Held for Portfolio	The following table presents information on mortgage loans held for portfolio by contractual maturity at the time of purchase. As of March 31, 2018 As of December 31, 2017 Medium-term (15 years or less) $ 15 $ 19 Long-term (greater than 15 years) 402 417 Total unpaid principal balance 417 436 Premiums 2 2 Discounts (2 ) (2 ) Total $ 417 $ 436 The following table presents the unpaid principal balance of mortgage loans held for portfolio by collateral or guarantee type. As of March 31, 2018 As of December 31, 2017 Conventional mortgage loans $ 391 $ 409 Government-guaranteed or insured mortgage loans 26 27 Total unpaid principal balance $ 417 $ 436

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	3 Months Ended
Allowance for Credit Losses (Tables)	Mar. 31, 2018
Allowance for Credit Losses [Abstract]
Allowance for Credit Losses on Financing Receivables	The following table presents the activity in the allowance for credit losses related to conventional residential mortgage loans. For the Three Months Ended March 31, 2018 2017 Balance, beginning of period $ 1 $ 1 Provision for credit losses — — Balance, end of period $ 1 $ 1 The following table presents the recorded investment in conventional residential mortgage loans by impairment methodology. As of March 31, 2018 As of December 31, 2017 Allowance for credit losses: Collectively evaluated for impairment $ 1 $ 1 Recorded investment: Individually evaluated for impairment $ 11 $ 11 Collectively evaluated for impairment 382 400 Total recorded investment $ 393 $ 411
Past Due Financing Receivables	Key credit quality indicators for mortgage loans include the migration of past due mortgage loans, nonaccrual mortgage loans, and mortgage loans in process of foreclosure. The following tables present the Bank’s recorded investment in mortgage loans by these key credit quality indicators. As of March 31, 2018 Conventional Residential Mortgage Loans Government-guaranteed or Insured Residential Mortgage Loans Total Past due 30-59 days $ 11 $ 2 $ 13 Past due 60-89 days 3 2 5 Past due 90 days or more 11 — 11 Total past due mortgage loans 25 4 29 Total current mortgage loans 368 22 390 Total mortgage loans (1) $ 393 $ 26 $ 419 Other delinquency statistics: In process of foreclosure (2) $ 5 $ — $ 5 Seriously delinquent rate (3) 2.97 % 1.37 % 2.87 % Past due 90 days or more and still accruing interest (4) $ — $ — $ — Mortgage loans on nonaccrual status (5) $ 10 $ — $ 10 ____________ (1) The difference between the recorded investment and the carrying value of total mortgage loans of $2 relates to accrued interest. (2) Includes mortgage loans where the decision of foreclosure or similar alternative, such as a pursuit of deed-in-lieu, has been reported. Mortgage loans in the process of foreclosure are included in past due or current mortgage loans depending on their delinquency status. (3) Mortgage loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total mortgage loan portfolio segment. (4) Mortgage loans insured or guaranteed by the Federal Housing Administration or the Department of Veterans Affairs. (5) Represents mortgage loans with contractual principal or interest payments 90 days or more past due and not accruing interest. As of December 31, 2017 Conventional Residential Mortgage Loans Government-guaranteed or Insured Residential Mortgage Loans Total Past due 30-59 days $ 14 $ 3 $ 17 Past due 60-89 days 7 1 8 Past due 90 days or more 12 — 12 Total past due mortgage loans 33 4 37 Total current mortgage loans 378 23 401 Total mortgage loans (1) $ 411 $ 27 $ 438 Other delinquency statistics: In process of foreclosure (2) $ 6 $ — $ 6 Seriously delinquent rate (3) 3.51 % 1.33 % 3.37 % Past due 90 days or more and still accruing interest (4) $ — $ — $ — Mortgage loans on nonaccrual status (5) $ 12 $ — $ 12 ____________ (1) The difference between the recorded investment and the carrying value of total mortgage loans of $2 relates to accrued interest. (2) Includes mortgage loans where the decision of foreclosure or similar alternative, such as a pursuit of deed-in-lieu, has been reported. Mortgage loans in the process of foreclosure are included in past due or current mortgage loans depending on their delinquency status. (3) Mortgage loans that are 90 days or more past due or in the process of foreclosure expressed as a percentage of the total mortgage loan portfolio segment. (4) Mortgage loans insured or guaranteed by the Federal Housing Administration or the Department of Veterans Affairs. (5) Represents mortgage loans with contractual principal or interest payments 90

Consolidated Obligations (Table

Consolidated Obligations (Tables)	3 Months Ended
Consolidated Obligations (Tables)	Mar. 31, 2018
Debt Disclosure [Abstract]
Consolidated Obligation Bonds by Interest-Rate Payment	Interest-rate Payment Terms. The following table presents the Bank’s consolidated obligation bonds by interest-rate payment type. As of March 31, 2018 As of December 31, 2017 Fixed-rate $ 21,235 $ 19,978 Step up/down 2,144 1,864 Simple variable-rate 53,999 65,760 Total par value $ 77,378 $ 87,602
Consolidated Obligation Bonds Outstanding, by Year of Contractual Maturity	Redemption Terms. The following table presents the Bank’s participation in consolidated obligation bonds outstanding by year of contractual maturity. As of March 31, 2018 As of December 31, 2017 Amount Weighted- average Interest Rate (%) Amount Weighted- average Interest Rate (%) Due in one year or less $ 58,157 1.63 $ 60,410 1.34 Due after one year through two years 9,028 1.77 17,826 1.41 Due after two years through three years 3,756 1.81 3,351 1.67 Due after three years through four years 1,290 1.75 1,287 1.72 Due after four years through five years 3,933 2.29 3,503 2.21 Due after five years 1,214 3.04 1,225 3.03 Total par value 77,378 1.73 87,602 1.43 Premiums 12 14 Discounts (11 ) (10 ) Hedging adjustments (219 ) (83 ) Total $ 77,160 $ 87,523
Callable and Noncallable Consolidated Obligations Bonds Outstanding	The following table presents the Bank’s consolidated obligation bonds outstanding by call feature. As of March 31, 2018 As of December 31, 2017 Noncallable $ 68,644 $ 79,847 Callable 8,734 7,755 Total par value $ 77,378 $ 87,602
Summary of Callable Consolidated Obligation Bonds Outstanding, by Year of Contractual Maturity	The following table presents the Bank’s consolidated obligation bonds outstanding, by year of contractual maturity, or for callable consolidated obligation bonds, by next call date. As of March 31, 2018 As of December 31, 2017 Due or callable in one year or less $ 65,827 $ 66,715 Due or callable after one year through two years 8,003 17,071 Due or callable after two years through three years 2,117 2,362 Due or callable after three years through four years 515 612 Due or callable after four years through five years 378 308 Due or callable after five years 538 534 Total par value $ 77,378 $ 87,602
Consolidated Obligation Discount Notes	The following table presents the Bank’s participation in consolidated obligation discount notes. Book Value Par Value Weighted-average Interest Rate (%) As of March 31, 2018 $ 54,659 $ 54,794 1.60 As of December 31, 2017 $ 50,139 $ 50,217 1.21

Capital and Mandatorily Redee33

Capital and Mandatorily Redeemable Capital Stock (Tables)	3 Months Ended
Capital and Mandatorily Redeemable Capital Stock (Tables)	Mar. 31, 2018
Capital [Abstract]
Schedule of Compliance With Regulatory Capital Requirements	Capital. The following table presents the Bank’s compliance with the Federal Housing Finance Agency’s (Finance Agency) regulatory capital rules and requirements. As of March 31, 2018 As of December 31, 2017 Required Actual Required Actual Risk-based capital $ 1,619 $ 6,803 $ 1,581 $ 7,157 Total regulatory capital ratio 4.00 % 4.84 % 4.00 % 4.88 % Total regulatory capital (1) $ 5,618 $ 6,803 $ 5,863 $ 7,157 Leverage capital ratio 5.00 % 7.27 % 5.00 % 7.33 % Leverage capital $ 7,023 $ 10,204 $ 7,328 $ 10,736 ____________ (1)
Activity in Mandatorily Redeemable Capital Stock	Mandatorily Redeemable Capital Stock. The following table presents the activity in mandatorily redeemable capital stock. For the Three Months Ended March 31, 2018 2017 Balance, beginning of period $ 1 $ 1 Net reclassification from capital during the period 32 8 Repurchase/redemption of mandatorily redeemable capital stock (30 ) (8 ) Balance, end of period $ 3 $ 1
Amount of Mandatorily Redeemable Capital Stock by Year of Redemption	The following table presents the amount of mandatorily redeemable capital stock by year of redemption. The year of redemption in the table is the end of the five -year redemption period, or with respect to activity-based stock, the later of the expiration of the five -year redemption period or the activity’s maturity date. As of March 31, 2018 As of December 31, 2017 Due in one year or less $ 2 $ 1 Due after two years through three years 1 — Total $ 3 $ 1

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
Accumulated Other Comprehensive Income (Tables)	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components Comprising Accumulated Other Comprehensive Income	The following table present the components comprising accumulated other comprehensive income. Pension and Postretirement Benefits Noncredit Portion of Other-than- temporary Impairment Losses on Available-for- sale Securities Total Accumulated Other Comprehensive Income Balance, December 31, 2016 $ (20 ) $ 124 $ 104 Reclassification from accumulated other comprehensive income to net income: Amortization of pension and postretirement (1) 1 — 1 Net current period other comprehensive income 1 — 1 Balance, March 31, 2017 $ (19 ) $ 124 $ 105 Balance, December 31, 2017 $ (24 ) $ 134 $ 110 Other comprehensive income before reclassifications: Net change in fair value — (16 ) (16 ) Reclassification from accumulated other comprehensive income to net income: Amortization of pension and postretirement (1) 1 — 1 Net current period other comprehensive income (loss) 1 (16 ) (15 ) Balance, March 31, 2018 $ (23 ) $ 118 $ 95 ____________ (1)

Derivatives and Hedging Activ35

Derivatives and Hedging Activities (Tables)	3 Months Ended
Derivatives and Hedging Activities (Tables)	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments	The following table presents the notional amount, fair value of derivative instruments (excluding fair value adjustments related to variation margin on daily settled contracts), and total derivative assets and liabilities. Total derivative assets and liabilities include the effect of netting adjustments, cash collateral, and variation margin for daily settled contracts. For purposes of this disclosure, the derivative values include the fair value of derivatives and the related accrued interest. As of March 31, 2018 As of December 31, 2017 Notional Amount of Derivatives Derivative Assets Derivative Liabilities Notional Amount of Derivatives Derivative Assets Derivative Liabilities Derivatives in hedging relationships: Interest-rate swaps (1) $ 44,747 $ 35 $ 167 $ 45,057 $ 198 $ 359 Derivatives not designated as hedging instruments: Interest-rate swaps (1) 955 2 13 876 9 9 Interest-rate caps or floors 11,083 6 4 13,000 2 1 Total derivatives not designated as hedging instruments 12,038 8 17 13,876 11 10 Total derivatives before netting and collateral adjustments $ 56,785 43 184 $ 58,933 209 369 Netting adjustments and cash collateral (2) 279 (162 ) 125 (348 ) Derivative assets and derivative liabilities $ 322 $ 22 $ 334 $ 21 ___________ (1) Includes variation margin for daily settled contracts of negative $79 and $107 as of March 31, 2018 and December 31, 2017 , respectively. (2) Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty and includes fair value adjustments on derivatives for which variation margin is characterized as a daily settled contract. Cash collateral posted and related accrued interest was $441 and $507 as of March 31, 2018 and December 31, 2017 , respectively. Cash collateral received and related accrued interest was less than $1 and $34 as of March 31, 2018 and December 31, 2017
Components of Net Gains (Losses) on Derivatives and Hedging Activities	The following table presents the components of net gains on derivatives and hedging activities as presented on the Statements of Income. For the Three Months Ended March 31, 2018 2017 Derivatives and hedged items in fair value hedging relationships: Interest-rate swaps $ 19 $ 314 Derivatives not designated as hedging instruments: Interest-rate swaps 3 2 Interest-rate caps or floors 1 (1 ) Net interest settlements (1 ) (2 ) Total net gains (losses) related to derivatives not designated as hedging instruments 3 (1 ) Net gains on derivatives and hedging activities $ 22 $ 313
Gain (Losses) on Derivatives and Related Hedged Items Fair Value	The following table presents, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair value hedging relationships and the impact of those derivatives on the Bank’s net interest income. For the Three Months Ended March 31, 2018 2017 Hedged Item Type Gains (Losses) on Derivative Gains (Losses) on Hedged Item Net Fair Value Effect of Derivatives on Net Interest Income (1) Gains (Losses) on Derivative Gains (Losses) on Hedged Item Net Fair Value Effect of Derivatives on Net Interest Income (1) Advances $ 337 $ (323 ) $ 14 $ (33 ) $ 425 $ (109 ) $ 316 $ (77 ) Consolidated obligations: Bonds (131 ) 136 5 4 (30 ) 28 (2 ) 32 Discount notes — — — (1 ) 3 (3 ) — (3 ) Total $ 206 $ (187 ) $ 19 $ (30 ) $ 398 $ (84 ) $ 314 $ (48 ) ____________ (1) The net interest on derivatives in fair value hedge relationships is presented in the interest income or expense line item of the respective hedged item.
Offsetting Assets [Table Text Block]	The following table presents the fair value of derivative instruments meeting or not meeting netting requirements, including the related collateral received from or pledged to counterparties. As of March 31, 2018 As of December 31, 2017 Derivative Assets Derivative Liabilities Derivative Assets Derivative Liabilities Gross recognized amount: Uncleared derivatives $ 41 $ 175 $ 19 $ 106 Cleared derivatives 2 9 190 263 Total gross recognized amount 43 184 209 369 Gross amounts of netting adjustments and cash collateral: Uncleared derivatives (39 ) (153 ) (17 ) (85 ) Cleared derivatives 318 (9 ) 142 (263 ) Total gross amounts of netting adjustments and cash collateral: 279 (162 ) 125 (348 ) Net amounts after netting adjustments and cash collateral: Uncleared derivatives 2 22 2 21 Cleared derivatives 320 — 332 — Total net amounts after netting adjustments and cash collateral 322 22 334 21 Non-cash collateral received or pledged not offset-cannot be sold or repledged: (1) Uncleared derivatives — — — — Cleared derivatives — — — — Total cannot be sold or repledged (1) — — — — Net unsecured amounts: (1) Uncleared derivatives 2 22 2 21 Cleared derivatives 320 — 332 — Total net unsecured amount (1) $ 322 $ 22 $ 334 $ 21 ____________ (1) The Bank had net credit exposure of $1 and $226 as of March 31, 2018 and December 31, 2017

Estimated Fair Values (Tables)

Estimated Fair Values (Tables)	3 Months Ended
Estimated Fair Values (Tables)	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	Estimated Fair Value Measurements on a Recurring Basis. The following tables present, for each fair value hierarchy level, the Bank’s financial assets and liabilities that are measured at fair value on a recurring basis on its Statements of Condition. As of March 31, 2018 Fair Value Measurements Using Netting Adjustments and Cash Collateral (1) Level 1 Level 2 Level 3 Total Assets Trading securities: Government-sponsored enterprises debt obligations $ — $ 55 $ — $ — $ 55 Available-for-sale securities: Private-label residential MBS — — 1,053 — 1,053 Derivative assets: Interest-rate related — 43 — 279 322 Grantor trust (included in Other assets) 49 — — — 49 Total assets at fair value $ 49 $ 98 $ 1,053 $ 279 $ 1,479 Liabilities Derivative liabilities: Interest-rate related $ — $ 184 $ — $ (162 ) $ 22 Total liabilities at fair value $ — $ 184 $ — $ (162 ) $ 22 ____________ (1) Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty. As of December 31, 2017 Fair Value Measurements Using Netting Adjustments and Cash Collateral (1) Level 1 Level 2 Level 3 Total Assets Trading securities: Government-sponsored enterprises debt obligations $ — $ 56 $ — $ — $ 56 Available-for-sale securities: Private-label residential MBS — — 1,104 — 1,104 Derivative assets: Interest-rate related — 209 — 125 334 Grantor trust (included in Other assets) 48 — — — 48 Total assets at fair value $ 48 $ 265 $ 1,104 $ 125 $ 1,542 Liabilities Derivative liabilities: Interest-rate related $ — $ 369 $ — $ (348 ) $ 21 Total liabilities at fair value $ — $ 369 $ — $ (348 ) $ 21 ____________ (1)
Reconciliation of Available-For-Sale Securities Measured at Fair Value	The following table presents a reconciliation of available-for-sale securities that are measured at fair value on a recurring basis using significant unobservable inputs (Level 3). For the Three Months Ended March 31, 2018 2017 Balance, beginning of period $ 1,104 $ 1,345 Total (losses) gains realized and unrealized: (1) Included in other comprehensive income (16 ) — Accretion of credit losses in net interest income 16 15 Settlements (51 ) (71 ) Balance, end of period $ 1,053 $ 1,289 ____________ (1) Related to available-for-sale securities held at period end.
Carrying Values and Estimated Fair Values	The following tables present the carrying values and estimated fair values of the Bank’s financial instruments. As of March 31, 2018 Estimated Fair Value Carrying Value Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets: Cash and due from banks $ 80 $ 80 $ 80 $ — $ — $ — Interest-bearing deposits 2,717 2,717 — 2,717 — — Securities purchased under agreements to resell 6,000 6,000 — 6,000 — — Federal funds sold 10,728 10,728 — 10,728 — — Trading securities 55 55 — 55 — — Available-for-sale securities 1,053 1,053 — — 1,053 — Held-to-maturity securities 26,930 26,951 — 26,412 539 — Advances 91,733 91,742 — 91,742 — — Mortgage loans held for portfolio, net 416 442 — 442 — — Accrued interest receivable 235 235 — 235 — — Derivative assets 322 322 — 43 — 279 Grantor trust assets (included in Other assets) 49 49 49 — — — Liabilities: Interest-bearing deposits 1,213 1,213 — 1,213 — — Consolidated obligations, net: Discount notes 54,659 54,652 — 54,652 — — Bonds 77,160 77,150 — 77,150 — — Mandatorily redeemable capital stock 3 3 3 — — — Accrued interest payable 144 144 — 144 — — Derivative liabilities 22 22 — 184 — (162 ) ____________ (1) Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty. As of December 31, 2017 Estimated Fair Value Carrying Value Total Level 1 Level 2 Level 3 Netting Adjustments and Cash Collateral (1) Assets: Cash and due from banks $ 2,357 $ 2,357 $ 2,357 $ — $ — $ — Interest-bearing deposits 2,176 2,176 — 2,176 — — Securities purchased under agreements to resell 2,500 2,500 — 2,500 — — Federal funds sold 9,380 9,380 — 9,380 — — Trading securities 56 56 — 56 — — Available-for-sale securities 1,104 1,104 — — 1,104 — Held-to-maturity securities 25,162 25,219 — 24,643 576 — Advances 102,440 102,446 — 102,446 — — Mortgage loans held for portfolio, net 435 467 — 467 — — Loan to another FHLBank 200 200 — 200 — — Accrued interest receivable 208 208 — 208 — — Derivative assets 334 334 — 209 — 125 Grantor trust assets (included in Other assets) 48 48 48 — — — Liabilities: Interest-bearing deposits 1,177 1,177 — 1,177 — — Consolidated obligations, net: Discount notes 50,139 50,132 — 50,132 — — Bonds 87,523 87,501 — 87,501 — — Mandatorily redeemable capital stock 1 1 1 — — — Accrued interest payable 142 142 — 142 — — Derivative liabilities 21 21 — 369 — (348 ) ____________ (1)

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
Commitments and Contingencies (Tables)	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Off Balance Sheet Commitments [Table Text Block]	The following table presents the Bank’s outstanding commitments, which represent off-balance sheet obligations. As of March 31, 2018 As of December 31, 2017 Expire Within One Year Expire After One Year Total Expire Within One Year Expire After One Year Total Standby letters of credit (1) $ 10,490 $ 16,784 $ 27,274 $ 9,520 $ 20,669 $ 30,189 Unsettled consolidated obligation bonds, at par (2) 95 — 95 3 — 3 ____________ (1) “Expire Within One Year” includes 16 standby letters of credit for a total of $64 and 16 standby letters of credit for a total of $59 as of March 31, 2018 and December 31, 2017 , respectively, that have no stated maturity date and are subject to renewal on an annual basis. (2)

Transactions With Shareholders

Transactions With Shareholders (Tables)	3 Months Ended
Transactions With Shareholders (Tables)	Mar. 31, 2018
Transactions With Shareholders [Abstract]
Schedule of Transactions with Shareholders [Table Text Block]	Shareholder Concentrations. The Bank considers shareholder concentration as members or non-members with regulatory capital stock outstanding in excess of 10 percent of the Bank’s total regulatory capital stock. The following tables present transactions with shareholders whose holdings of regulatory capital stock exceed 10 percent of total regulatory capital stock outstanding. As of March 31, 2018 Regulatory Capital Stock Outstanding Percent of Total Regulatory Capital Stock Outstanding Par Value of Advances Percent of Total Par Value of Advances Interest-bearing Deposits Percent of Total Interest-bearing Deposits Bank of America, National Association $ 1,227 25.82 $ 28,510 31.03 $ — 0.01 As of December 31, 2017 Regulatory Capital Stock Outstanding Percent of Total Regulatory Capital Stock Outstanding Par Value of Advances Percent of Total Par Value of Advances Interest-bearing Deposits Percent of Total Interest-bearing Deposits Bank of America, National Association $ 908 17.61 $ 21,010 20.55 $ — 0.01 Navy Federal Credit Union 675 13.09 15,530 15.19 195 16.58

Recently Issued and Adopted A39

Recently Issued and Adopted Accounting Guidance (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest paid on discount notes	$ 68

Trading Securities (Trading Sec

Trading Securities (Trading Securities by Major Security Type) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	$ 55	$ 56
Government-Sponsored Enterprises Debt Obligations [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading Securities	$ 55	$ 56

Trading Securities (Net Losses

Trading Securities (Net Losses on Trading Securities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Trading Securities [Abstract]
Net losses on trading securities held at period end	$ (1)	$ (2)

Available-for-sale Securities42

Available-for-sale Securities (Available-for-sale by Major Security Type) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities		$ 1,053	$ 1,104
Mortgage-backed Securities, Private-label residential[Member] \| Mortgage-backed Securities, Private-label residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost of available-for-sale securities		935	970
Other-than-temporary Impairment Recognized in Accumulated Other Comprehensive Income	[1]	1	1
Gross unrealized gains on available-for-sale securities		119	135
Gross unrealized losses on available-for-sale securities		0	0
Available-for-sale Securities		$ 1,053	$ 1,104

[1]	Amounts represent the non-credit portion of an other-than-temporary impairment during the life of the security.

Available-for-sale Securities43

Available-for-sale Securities (Summary of Available-for-sale Securities in a Continuous Unrealized Loss Position) (Details) - Mortgage-backed Securities, Private-label residential[Member] - Mortgage-backed Securities, Private-label residential [Member] $ in Millions	Mar. 31, 2018USD ($)positions	Dec. 31, 2017USD ($)positions
Schedule of Available-for-sale Securities [Line Items]
Number of available-for-sale securities in unrealized loss position for less than 12 months \| positions	0	1
Number of available-for-sale securities in unrealized loss position for 12 months or more \| positions	3	1
Number of available-for-sale securities in unrealized loss position \| positions	3	2
Estimated fair value of available-for-sale securities in unrealized loss position for less than 12 months	$ 0	$ 7
Estimated fair value of available-for-sale securities in unrealized loss position for 12 months or more	9	4
Estimated fair value of available-for-sale securities in unrealized loss position	9	11
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	0	1
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Accumulated In Investments	1	0
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In Investments	$ 1	$ 1

Available-for-sale Securities44

Available-for-sale Securities (Summary of Available-for-sale MBS issued by Members or Affiliates of Members) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	$ 1,053	$ 1,104
M B S Issued by Members or Affiliates of Members [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost of available-for-sale securities	620	638
Other-than-temporary Impairment Recognized in Accumulated Other Comprehensive Income	0	1
Gross unrealized gains on available-for-sale securities	91	104
Gross unrealized losses on available-for-sale securities	0	0
Available-for-sale Securities	$ 711	$ 741

Held-to-maturity Securities (He

Held-to-maturity Securities (Held-to-maturity by Major Security Type) (Details) $ in Millions	Mar. 31, 2018USD ($)positions	Dec. 31, 2017USD ($)positions
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity Securities with Unrealized Losses Number of Positions Less than Twelve Months \| positions	88	42
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 5,842	$ 3,691
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 39	$ 17
Held to Maturity Securities with Unrealized Losses Number of Positions Twelve Months or Longer \| positions	61	68
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 3,522	$ 3,748
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 31	$ 25
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| positions	149	110
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 9,364	$ 7,439
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	70	42
Amortized cost of held-to-maturity securities	26,930	25,162
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	91	99
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	70	42
Held-to-maturity securities, fair value	$ 26,951	$ 25,219
State or Local Housing Agency Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity Securities with Unrealized Losses Number of Positions Less than Twelve Months \| positions	1	1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 1	$ 1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Held to Maturity Securities with Unrealized Losses Number of Positions Twelve Months or Longer \| positions	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 0	$ 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| positions	1	1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 1	$ 1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	0	0
Amortized cost of held-to-maturity securities	1	1
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held-to-maturity securities, fair value	$ 1	$ 1
Government-Sponsored Enterprises Debt Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity Securities with Unrealized Losses Number of Positions Less than Twelve Months \| positions	8	6
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 618	$ 996
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 1
Held to Maturity Securities with Unrealized Losses Number of Positions Twelve Months or Longer \| positions	5	5
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 1,496	$ 1,495
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 4	$ 5
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| positions	13	11
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 2,114	$ 2,491
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	5	6
Amortized cost of held-to-maturity securities	4,862	5,350
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	7	8
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	5	6
Held-to-maturity securities, fair value	$ 4,864	$ 5,352
Mortgage-backed Securities, Private-label residential[Member] \| Mortgage-backed Securities, Private-label residential [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity Securities with Unrealized Losses Number of Positions Less than Twelve Months \| positions	12	7
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 50	$ 19
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 0
Held to Maturity Securities with Unrealized Losses Number of Positions Twelve Months or Longer \| positions	11	16
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 34	$ 70
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| positions	23	23
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 84	$ 89
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	1	0
Amortized cost of held-to-maturity securities	532	568
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	8	8
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	1	0
Held-to-maturity securities, fair value	539	576
Residential [Member] \| U.S. agency obligations-guaranteed residential
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held-to-maturity securities	146	157
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	2	2
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held-to-maturity securities, fair value	$ 148	$ 159
Residential [Member] \| Government-sponsored enterprises
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity Securities with Unrealized Losses Number of Positions Less than Twelve Months \| positions	18	12
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 1,976	$ 1,466
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 33	$ 11
Held to Maturity Securities with Unrealized Losses Number of Positions Twelve Months or Longer \| positions	39	40
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 1,091	$ 1,154
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 18	$ 13
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| positions	57	52
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 3,067	$ 2,620
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	51	24
Amortized cost of held-to-maturity securities	10,136	9,357
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	63	65
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	51	24
Held-to-maturity securities, fair value	$ 10,148	$ 9,398
Commercial [Member] \| Government-sponsored enterprises
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity Securities with Unrealized Losses Number of Positions Less than Twelve Months \| positions	49	16
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 3,197	$ 1,209
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 4	$ 5
Held to Maturity Securities with Unrealized Losses Number of Positions Twelve Months or Longer \| positions	6	7
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 901	$ 1,029
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 9	$ 7
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| positions	55	23
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	$ 4,098	$ 2,238
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	13	12
Amortized cost of held-to-maturity securities	11,253	9,729
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	11	16
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	13	12
Held-to-maturity securities, fair value	$ 11,251	$ 9,733

Held-to-maturity Securities (Su

Held-to-maturity Securities (Summary of Held-to-maturity Securities in a Continuous Unrealized Loss Position) (Details) $ in Millions	Mar. 31, 2018USD ($)positions	Dec. 31, 2017USD ($)positions
Schedule of Held-to-maturity Securities [Line Items]
Number of unrealized loss positions held less than 12 months \| positions	88	42
Number of unrealized loss positions held more than 12 months \| positions	61	68
Total number of unrealized loss positions \| positions	149	110
Estimated fair value of unrealized loss positions held less than 12 months	$ 5,842	$ 3,691
Estimated fair value of unrealized loss positions held 12 months or more	3,522	3,748
Total estimated fair value of positions in an unrealized loss	9,364	7,439
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	39	17
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	31	25
Total gross unrealized loss	$ 70	$ 42
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Number of unrealized loss positions held less than 12 months \| positions	1	1
Number of unrealized loss positions held more than 12 months \| positions	0	0
Total number of unrealized loss positions \| positions	1	1
Estimated fair value of unrealized loss positions held less than 12 months	$ 1	$ 1
Estimated fair value of unrealized loss positions held 12 months or more	0	0
Total estimated fair value of positions in an unrealized loss	1	1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Total gross unrealized loss	$ 0	$ 0
Government-Sponsored Enterprises Debt Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Number of unrealized loss positions held less than 12 months \| positions	8	6
Number of unrealized loss positions held more than 12 months \| positions	5	5
Total number of unrealized loss positions \| positions	13	11
Estimated fair value of unrealized loss positions held less than 12 months	$ 618	$ 996
Estimated fair value of unrealized loss positions held 12 months or more	1,496	1,495
Total estimated fair value of positions in an unrealized loss	2,114	2,491
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	1
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4	5
Total gross unrealized loss	$ 5	$ 6
Mortgage-backed Securities, Private-label residential [Member] \| Mortgage-backed Securities, Private-label residential[Member]
Schedule of Held-to-maturity Securities [Line Items]
Number of unrealized loss positions held less than 12 months \| positions	12	7
Number of unrealized loss positions held more than 12 months \| positions	11	16
Total number of unrealized loss positions \| positions	23	23
Estimated fair value of unrealized loss positions held less than 12 months	$ 50	$ 19
Estimated fair value of unrealized loss positions held 12 months or more	34	70
Total estimated fair value of positions in an unrealized loss	84	89
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Total gross unrealized loss	$ 1	$ 0
Residential [Member] \| Government-sponsored enterprises
Schedule of Held-to-maturity Securities [Line Items]
Number of unrealized loss positions held less than 12 months \| positions	18	12
Number of unrealized loss positions held more than 12 months \| positions	39	40
Total number of unrealized loss positions \| positions	57	52
Estimated fair value of unrealized loss positions held less than 12 months	$ 1,976	$ 1,466
Estimated fair value of unrealized loss positions held 12 months or more	1,091	1,154
Total estimated fair value of positions in an unrealized loss	3,067	2,620
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	33	11
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	18	13
Total gross unrealized loss	$ 51	$ 24
Commercial [Member] \| Government-sponsored enterprises
Schedule of Held-to-maturity Securities [Line Items]
Number of unrealized loss positions held less than 12 months \| positions	49	16
Number of unrealized loss positions held more than 12 months \| positions	6	7
Total number of unrealized loss positions \| positions	55	23
Estimated fair value of unrealized loss positions held less than 12 months	$ 3,197	$ 1,209
Estimated fair value of unrealized loss positions held 12 months or more	901	1,029
Total estimated fair value of positions in an unrealized loss	4,098	2,238
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	5
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	9	7
Total gross unrealized loss	$ 13	$ 12

Held-to-maturity Securities (Re

Held-to-maturity Securities (Redemption Terms) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held-to-maturity securities	$ 26,930	$ 25,162
Estimated fair value of held-to-maturity securities	26,951	25,219
Non Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held-to-maturity securities due in one year or less	2,325	2,913
Amortized cost of held-to-maturity securities due after one year through five years	2,072	1,972
Amortized cost of held-to-maturity securities due after five years through ten years	406	406
Due after 10 years	60	60
Amortized cost of held-to-maturity securities	4,863	5,351
Estimated fair value of held-to-maturity securities due in one year or less	2,323	2,909
Estimated fair value of held-to-maturity securities due after one year through five years	2,073	1,975
Estimated fair value of held-to-maturity securities due after five years through ten years	409	409
Due after 10 years	60	60
Estimated fair value of held-to-maturity securities	4,865	5,353
Mortgage-backed securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held-to-maturity securities	22,067	19,811
Estimated fair value of held-to-maturity securities	$ 22,086	$ 19,866

Held-to-maturity Securities (48

Held-to-maturity Securities (Summary of Held-to-Maturity MBS issued by Members or Affliates of Members (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held-to-maturity securities	$ 26,930	$ 25,162
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	91	99
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	70	42
Held-to-maturity securities, fair value	26,951	25,219
Mortgage-backed Securities, Private-label residential [Member] \| Bank of America Corporation, Charlotte, NC [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of held-to-maturity securities	116	125
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	1	1
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held-to-maturity securities, fair value	$ 117	$ 126

Other-than-temporary Impairme49

Other-than-temporary Impairment (Roll-forward of Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Roll-Forward Cumulative Credit Losses Recognized
Balance, beginning of period	$ 394	$ 455
Increase in cash flows expected to be collected, (accreted as interest income over the remaining lives of the applicable securities)	(16)	(15)
Balance, end of period	$ 378	$ 440

Advances Advances (Redemption T

Advances Advances (Redemption Terms) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Advances [Abstract]
Due in one year or less		$ 60,276	$ 60,795
Due after one year through two years		10,214	10,779
Due after two years through three years		6,497	14,210
Due after three years through four years		3,213	4,162
Due after four years through five years		4,088	3,729
Due after five years		7,584	8,574
Federal Home Loan Bank, Advances, Par Value		91,872	102,249
Discount on AHP advances	[1]	(4)	(4)
Discount on EDGE advances	[2]	(2)	(3)
Hedging adjustments		(133)	198
Total Federal Home Loan Bank Advances		$ 91,733	$ 102,440

[1]	The Affordable Housing Program
[2]	The Economic Development and Growth Enhancement Program

Advances (Advances by Year of C

Advances (Advances by Year of Contractual Maturity for Convertible Advances) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Advances [Abstract]
Due or convertible in one year or less	$ 60,669	$ 60,984
Due or convertible after one year through two years	10,380	10,846
Due or convertible after two years through three years	6,530	14,326
Due or convertible after three years through four years	3,233	4,184
Due or convertible after four years through five years	4,061	3,695
Due or convertible after five years	6,999	8,214
Federal Home Loan Bank, Advances, Par Value	$ 91,872	$ 102,249

Advances (Interest-rate Payment

Advances (Interest-rate Payment Terms) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Advances [Abstract]
Fixed-rate, due in one year or less	$ 41,147	$ 37,107
Fixed-rate, due after one year	21,376	22,044
Total fixed-rate	62,523	59,151
Variable-rate, due in one year or less	19,130	23,687
Variable-rate, due after one year	10,219	19,411
Total variable-rate	29,349	43,098
Federal Home Loan Bank, Advances, Par Value	$ 91,872	$ 102,249

Advances (Credit Risk Narrative

Advances (Credit Risk Narrative) (Details Textual) $ in Millions	Mar. 31, 2018USD ($)Institutions	Dec. 31, 2017USD ($)Institutions
Advances [Abstract]
Number of Top Advances Borrowers \| Institutions	10	10
Advances to Ten Largest Borrowers	$ 65,398	$ 71,440
Advances Ten Largest Borrowers Percent of Total	71.20%	69.90%
Allowance for credit losses on advances	$ 0	$ 0
Advances past due	$ 0	$ 0

Mortgage Loans Held for Portf54

Mortgage Loans Held for Portfolio (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 417	$ 436
Premiums	2	2
Discounts	(2)	(2)
Total	417	436
Fixed-rate medium-term residential mortgage loans [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 15	$ 19
Mortgage loans on real estate, original contract terms	15 years	15 years
Fixed-rate long-term residential mortgage loans [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 402	$ 417
Conventional Mortgage Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	391	409
Government-guaranteed or insured mortgage loans [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 26	$ 27

Allowance for Credit Losses (Ro

Allowance for Credit Losses (Roll-forward of Allowance for Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	$ 1
Balance, end of period	1
Residential Portfolio Segment [Member] \| Conventional Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	1	$ 1
Provision for credit losses	0	0
Balance, end of period	$ 1	$ 1

Allowance for Credit Losses (Mo

Allowance for Credit Losses (Mortgage Loan Portfolio by Impairment Methodology) (Details) - USD ($) $ in Millions	Mar. 31, 2018		Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance for credit losses	$ 1		$ 1
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total recorded investment	419	[1]	438	[2]
Residential Portfolio Segment [Member] \| Conventional Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses, collectively evaluated for impairment	1		1
Total allowance for credit losses	1		1		$ 1	$ 1
Recorded investment, individually evaluated for impairment	11		11
Recorded investment, collectively evaluated for impairment	382		400
Total recorded investment	$ 393	[1]	$ 411	[2]

[1]	The difference between the recorded investment and the carrying value of total mortgage loans of $2
[2]	The difference between the recorded investment and the carrying value of total mortgage loans of $2

Allowance for Credit Losses (Cr

Allowance for Credit Losses (Credit Quality Indicators) (Details) - Residential Portfolio Segment [Member] - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		$ 29		$ 37
Total current mortgage loans		390		401
Total recorded investment		419	[1]	438	[2]
In process of foreclosure	[3]	$ 5		$ 6
Seriously delinquent rate	[4]	2.87%		3.37%
Past due 90 days or more and still accruing interest	[5]	$ 0		$ 0
Loans on nonaccrual status	[6]	10		12
Accrued Interest on Mortgage Loans		2		2
Conventional Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		25		33
Total current mortgage loans		368		378
Total recorded investment		393	[1]	411	[2]
In process of foreclosure	[3]	$ 5		$ 6
Seriously delinquent rate	[4]	2.97%		3.51%
Past due 90 days or more and still accruing interest	[5]	$ 0		$ 0
Loans on nonaccrual status	[6]	10		12
Government-guaranteed or insured mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		4		4
Total current mortgage loans		22		23
Total recorded investment		26	[1]	27	[2]
In process of foreclosure	[3]	$ 0		$ 0
Seriously delinquent rate	[4]	1.37%		1.33%
Past due 90 days or more and still accruing interest	[5]	$ 0		$ 0
Loans on nonaccrual status	[6]	0		0
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		13		17
Financing Receivables, 30 to 59 Days Past Due [Member] \| Conventional Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		11		14
Financing Receivables, 30 to 59 Days Past Due [Member] \| Government-guaranteed or insured mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		2		3
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		5		8
Financing Receivables, 60 to 89 Days Past Due [Member] \| Conventional Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		3		7
Financing Receivables, 60 to 89 Days Past Due [Member] \| Government-guaranteed or insured mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		2		1
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		11		12
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Conventional Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		11		12
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] \| Government-guaranteed or insured mortgage loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total past due mortgage loans		$ 0		$ 0

[1]	The difference between the recorded investment and the carrying value of total mortgage loans of $2
[2]	The difference between the recorded investment and the carrying value of total mortgage loans of $2
[3]	Includes mortgage loans where the decision of foreclosure or similar alternative, such as a pursuit of deed-in-lieu, has been reported. Mortgage loans in the process of foreclosure are included in past due or current mortgage loans depending on their delinquency status.
[4]	Mortgage loans that are 90
[5]	Mortgage loans insured or guaranteed by the Federal Housing Administration or the Department of Veterans Affairs.
[6]	Represents mortgage loans with contractual principal or interest payments 90

Consolidated Obligations (Narra

Consolidated Obligations (Narrative) (Details)	3 Months Ended
Consolidated Obligations (Narrative) (Details)	Mar. 31, 2018bank
Debt Disclosure [Abstract]
Number of Federal Home Loan Banks	11
Maximum contractual maturity period of discount notes (up to one year)	1 year

Consolidated Obligations (Inter

Consolidated Obligations (Interest-rate Payment Terms) (Details) - Consolidated Obligation Bonds [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Bonds par value	$ 77,378	$ 87,602
Fixed-rate [Member]
Debt Instrument [Line Items]
Bonds par value	21,235	19,978
Step up/down [Member]
Debt Instrument [Line Items]
Bonds par value	2,144	1,864
Simple variable-rate [Member]
Debt Instrument [Line Items]
Bonds par value	$ 53,999	$ 65,760

Consolidated Obligations (Redem

Consolidated Obligations (Redemption Terms) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Federal Home Loan Bank, Consolidated Obligations, Bonds	$ 77,160	$ 87,523
Consolidated Obligation Bonds [Member]
Debt Instrument [Line Items]
Bonds, Due in one year or less	58,157	60,410
Bonds, Due after one year through two years	9,028	17,826
Bonds, Due after two years through three years	3,756	3,351
Bonds, Due after three years through four years	1,290	1,287
Bonds, Due after four years through five years	3,933	3,503
Bonds, Due after five years	1,214	1,225
Bonds par value	77,378	87,602
Premiums	12	14
Discounts	(11)	(10)
Hedging adjustments	(219)	(83)
Federal Home Loan Bank, Consolidated Obligations, Bonds	$ 77,160	$ 87,523
Bonds, Due in one year or less, weighted average interest rate	1.63%	1.34%
Bonds, Due after one year through two years, weighted average interest rate	1.77%	1.41%
Bonds, Due after two years through three years, weighted average interest rate	1.81%	1.67%
Bonds, Due after three years through four years, weighted average interest rate	1.75%	1.72%
Bonds, Due after four years through five years, weighted average interest rate	2.29%	2.21%
Bonds, Due after five years, weighted average interest rate	3.04%	3.03%
Total, weighted average interest rate	1.73%	1.43%

Consolidated Obligations (Bonds

Consolidated Obligations (Bonds by Callable Feature) (Details) - Consolidated Obligation Bonds [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Bonds par value	$ 77,378	$ 87,602
Noncallable [Member]
Debt Instrument [Line Items]
Bonds par value	68,644	79,847
Callable [Member]
Debt Instrument [Line Items]
Bonds par value	$ 8,734	$ 7,755

Consolidated Obligations (Bon62

Consolidated Obligations (Bonds by Maturity or Call Date) (Details) - Consolidated Obligation Bonds [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Bonds, Due in one year or less	$ 58,157	$ 60,410
Bonds, Due after one year through two years	9,028	17,826
Bonds, Due after two years through three years	3,756	3,351
Bonds, Due after three years through four years	1,290	1,287
Bonds, Due after four years through five years	3,933	3,503
Bonds, Due after five years	1,214	1,225
Bonds par value	77,378	87,602
Earlier of Contractual Maturity or Next Call Date [Member]
Debt Instrument [Line Items]
Bonds, Due in one year or less	65,827	66,715
Bonds, Due after one year through two years	8,003	17,071
Bonds, Due after two years through three years	2,117	2,362
Bonds, Due after three years through four years	515	612
Bonds, Due after four years through five years	378	308
Bonds, Due after five years	$ 538	$ 534

Consolidated Obligations (Disco

Consolidated Obligations (Discount Notes) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Discount notes	$ 54,659	$ 50,139
Short-term Debt [Member]
Short-term Debt [Line Items]
Discount notes	54,659	50,139
Discount notes par value	$ 54,794	$ 50,217
Discount notes weighted average interest rate	1.60%	1.21%

Capital and Mandatorily Redee64

Capital and Mandatorily Redeemable Capital Stock (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Capital [Abstract]
Mandatorily redeemable capital stock	$ 3	$ 1	$ 1	$ 1
Redemption period for excess capital stock (in years)	5 years

Capital and Mandatorily Redee65

Capital and Mandatorily Redeemable Capital Stock (Regulatory Capital Rules and Requirements) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Capital [Abstract]
Risk-based capital, Required	$ 1,619	$ 1,581
Risk-based capital, Actual	$ 6,803	$ 7,157
Total regulatory capital ratio, Required	4.00%	4.00%
Total regulatory capital ratio, Actual	4.84%	4.88%
Total regulatory capital, Required	$ 5,618	$ 5,863
Total regulatory capital, Actual	$ 6,803	$ 7,157
Leverage capital ratio, Required	5.00%	5.00%
Leverage capital ratio, Actual	7.27%	7.33%
Leverage capital, Required	$ 7,023	$ 7,328
Leverage capital, Actual	$ 10,204	$ 10,736

Capital and Mandatorily Redee66

Capital and Mandatorily Redeemable Capital Stock (Mandatorily Redeemable Capital Stock Roll-forward) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Capital [Abstract]
Balance, beginning of period	$ 1	$ 1
Net Shares Reclassified to Mandatorily Redeemable Capital Stock	32	8
Repurchase/redemption of mandatorily redeemable capital stock	(30)	(8)
Balance, end of period	$ 3	$ 1

Capital and Mandatorily Redee67

Capital and Mandatorily Redeemable Capital Stock (Mandatorily Redeemable Capital Stock by Year of Redemption) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Capital [Abstract]
Financial Instruments Subject to Mandatory Redemption, Redeemable in Year Three	$ 1	$ 0
Due in one year or less	2	1
Mandatorily redeemable capital stock	$ 3	$ 1	$ 1	$ 1

Accumulated Other Comprehensi68

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of period		$ 110
Net change in fair value		(16)	$ 0
Amortization of pension and posttretirement		1	1
Total other comprehensive income		(15)	1
Accumulated Other Comprehensive Income (Loss), End of period		95
Pension and Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of period		(24)	(20)
Net change in fair value		0
Amortization of pension and posttretirement	[1]	1	1
Total other comprehensive income		1	1
Accumulated Other Comprehensive Income (Loss), End of period		(23)	(19)
Total Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of period		110	104
Net change in fair value		(16)
Amortization of pension and posttretirement	[1]	1	1
Total other comprehensive income		(15)	1
Accumulated Other Comprehensive Income (Loss), End of period		95	105
Available-for-sale Securities [Member] \| Noncredit Portion of Other Than Temporary Impairment Losses on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning of period		134	124
Net change in fair value		(16)
Amortization of pension and posttretirement	[1]	0	0
Total other comprehensive income		(16)	0
Accumulated Other Comprehensive Income (Loss), End of period		$ 118	$ 124

[1]	Included in Noninterest expense - Other on the Statements of Income

Derivatives and Hedging Activ69

Derivatives and Hedging Activities (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Variation Margin for Daily Settled Contracts, Net		$ (79)	$ 107
Cash collateral posted		441	507
Cash collateral received		1	34
Total notional amount of derivatives before netting and collateral adjustments		56,785	58,933
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		43	209
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		184	369
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1],[2]	279	125
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1],[2]	(162)	(348)
Derivative assets		322	334
Derivative liabilities		22	21
Designated as Hedging Instrument [Member] \| Interest rate swaps [Member]
Derivative [Line Items]
Total notional amount of derivatives before netting and collateral adjustments	[3]	44,747	45,057
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	[3]	35	198
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[3]	167	359
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total notional amount of derivatives before netting and collateral adjustments		12,038	13,876
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		8	11
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		17	10
Not Designated as Hedging Instrument [Member] \| Interest rate swaps [Member]
Derivative [Line Items]
Total notional amount of derivatives before netting and collateral adjustments	[3]	955	876
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	[3]	2	9
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[3]	13	9
Not Designated as Hedging Instrument [Member] \| Interest rate caps or floors [Member]
Derivative [Line Items]
Total notional amount of derivatives before netting and collateral adjustments		11,083	13,000
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		6	2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		$ 4	$ 1

[1]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty and includes fair value adjustments on derivatives for which variation margin is characterized as a daily settled contract. Cash collateral posted and related accrued interest was $441 and $507 as of March 31, 2018 and December 31, 2017 , respectively. Cash collateral received and related accrued interest was less than $1 and $34 as of March 31, 2018 and December 31, 2017
[2]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty.
[3]	Includes variation margin for daily settled contracts of negative $79 and $107 as of March 31, 2018 and December 31, 2017

Derivatives and Hedging Activ70

Derivatives and Hedging Activities (Net Gains (Losses) on Derivatives and Hedging Activities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net gains on derivatives and hedged items in fair value hedging relationships	$ 19	$ 314
Net gains (losses) on derivatives not designated as hedging instruments	3	(1)
Net gains on derivatives and hedging activities	22	313
Interest rate swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains on derivatives and hedged items in fair value hedging relationships	19	314
Net gains (losses) on derivatives not designated as hedging instruments	3	2
Interest rate caps or floors [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on derivatives not designated as hedging instruments	1	(1)
Net Interest Settlements [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on derivatives not designated as hedging instruments	$ (1)	$ (2)

Derivatives and Hedging Activ71

Derivatives and Hedging Activities (Effect of Fair Value Hedged Related Derivative Instruments) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on Derivative		$ 206	$ 398
Gains (Losses) on Hedged Item		(187)	(84)
Net Fair Value Hedge Ineffectiveness		19	314
Effect of Derivatives on Net Interest Income	[1]	(30)	(48)
Advances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on Derivative		337	425
Gains (Losses) on Hedged Item		(323)	(109)
Net Fair Value Hedge Ineffectiveness		14	316
Effect of Derivatives on Net Interest Income	[1]	(33)	(77)
Consolidated Obligation Bonds [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on Derivative		(131)	(30)
Gains (Losses) on Hedged Item		136	28
Net Fair Value Hedge Ineffectiveness		5	(2)
Effect of Derivatives on Net Interest Income	[1]	4	32
Short-term Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on Derivative		0	3
Gains (Losses) on Hedged Item		0	(3)
Net Fair Value Hedge Ineffectiveness		0	0
Effect of Derivatives on Net Interest Income	[1]	$ (1)	$ (3)

[1]	The net interest on derivatives in fair value hedge relationships is presented in the interest income or expense line item of the respective hedged item.

Derivatives and Hedging Activ72

Derivatives and Hedging Activities (Offsetting of Derivative Assets and Derivative Liabilities) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 43	$ 209
Derivative Liability, Fair Value, Gross Liability		184	369
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1],[2]	279	125
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1],[2]	(162)	(348)
Derivative assets		322	334
Derivative liabilities		22	21
Derivative, Collateral, Obligation to Return Securities That Cannot Be Sold or Repledged	[3]	0	0
Derivative, Collateral, Right to Reclaim Securities That Cannot Be Sold or Repledged	[3]	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	[3]	322	334
Derivative Liability, Fair Value, Amount Offset Against Collateral	[3]	22	21
Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Credit Derivative Exposure Net		1	226
Uncleared derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		41	19
Derivative Liability, Fair Value, Gross Liability		175	106
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(39)	(17)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(153)	(85)
Derivative assets		2	2
Derivative liabilities		22	21
Derivative, Collateral, Obligation to Return Securities That Cannot Be Sold or Repledged	[3]	0	0
Derivative, Collateral, Right to Reclaim Securities That Cannot Be Sold or Repledged	[3]	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	[3]	2	2
Derivative Liability, Fair Value, Amount Offset Against Collateral	[3]	22	21
Cleared derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		2	190
Derivative Liability, Fair Value, Gross Liability		9	263
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		318	142
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(9)	(263)
Derivative assets		320	332
Derivative liabilities		0	0
Derivative, Collateral, Obligation to Return Securities That Cannot Be Sold or Repledged	[3]	0	0
Derivative, Collateral, Right to Reclaim Securities That Cannot Be Sold or Repledged	[3]	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	[3]	320	332
Derivative Liability, Fair Value, Amount Offset Against Collateral	[3]	$ 0	$ 0

[1]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty and includes fair value adjustments on derivatives for which variation margin is characterized as a daily settled contract. Cash collateral posted and related accrued interest was $441 and $507 as of March 31, 2018 and December 31, 2017 , respectively. Cash collateral received and related accrued interest was less than $1 and $34 as of March 31, 2018 and December 31, 2017
[2]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty.
[3]	The Bank had net credit exposure of $1 and $226 as of March 31, 2018 and December 31, 2017

Derivatives and Hedging Activ73

Derivatives and Hedging Activities (Narrative) (Details) $ in Millions	Mar. 31, 2018USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative credit-risk-related contingent features net liability position aggregate fair value	$ 7
Collateral already posted, aggregate fair value	0
Additional collateral	$ 2

Estimated Fair Values (Estimate

Estimated Fair Values (Estimated Fair Value Measurements on a Recurring Basis) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		$ 55	$ 56
Assets:
Available-for-sale Securities		1,053	1,104
Derivative assets		322	334
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1],[2]	279	125
Liabilities:
Derivative liabilities		22	21
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1],[2]	(162)	(348)
Government-Sponsored Enterprises Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		55	56
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		0	0
Assets:
Available-for-sale Securities		0	0
Derivative assets		0	0
Grantor trust assets (included in Other assets)		49	48
Liabilities:
Derivative liabilities		0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		55	56
Assets:
Available-for-sale Securities		0	0
Derivative assets		43	209
Grantor trust assets (included in Other assets)		0	0
Liabilities:
Derivative liabilities		184	369
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		0	0
Assets:
Available-for-sale Securities		1,053	1,104
Derivative assets		0	0
Grantor trust assets (included in Other assets)		0	0
Liabilities:
Derivative liabilities		0	0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		0	0
Assets:
Available-for-sale Securities		0	0
Derivative, Collateral, Right to Reclaim Cash		279	125	[2]
Grantor trust assets (included in Other assets)		0	0
Liabilities:
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	(162)	(348)
Fair Value, Measurements, Recurring [Member] \| Government-Sponsored Enterprises Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		0	0
Fair Value, Measurements, Recurring [Member] \| Mortgage-backed Securities, Private-label residential [Member]
Assets:
Available-for-sale Securities		0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets:
Grantor trust assets (included in Other assets)		49	48
Total recurring assets at fair value		49	48
Liabilities:
Total recurring liabilities at fair value		0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Government-Sponsored Enterprises Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Mortgage-backed Securities, Private-label residential [Member]
Assets:
Available-for-sale Securities		0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets:
Grantor trust assets (included in Other assets)		0	0
Total recurring assets at fair value		98	265
Liabilities:
Total recurring liabilities at fair value		184	369
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Government-Sponsored Enterprises Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		55	56
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Mortgage-backed Securities, Private-label residential [Member]
Assets:
Available-for-sale Securities		0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets:
Grantor trust assets (included in Other assets)		0	0
Total recurring assets at fair value		1,053	1,104
Liabilities:
Total recurring liabilities at fair value		0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Government-Sponsored Enterprises Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Mortgage-backed Securities, Private-label residential [Member]
Assets:
Available-for-sale Securities		1,053	1,104
Interest rate swaps [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		279	125
Liabilities:
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(162)	(348)
Interest rate swaps [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets:
Derivative assets		0	0
Liabilities:
Derivative liabilities		0	0
Interest rate swaps [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets:
Derivative assets		43	209
Liabilities:
Derivative liabilities		184	369
Interest rate swaps [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets:
Derivative assets		0	0
Liabilities:
Derivative liabilities		0	0
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		55	56
Assets:
Available-for-sale Securities		1,053	1,104
Derivative assets		322	334
Grantor trust assets (included in Other assets)		49	48
Liabilities:
Derivative liabilities		22	21
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Grantor trust assets (included in Other assets)		49	48
Total recurring assets at fair value		1,479	1,542
Liabilities:
Total recurring liabilities at fair value		22	21
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Recurring [Member] \| Government-Sponsored Enterprises Debt Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading Securities		55	56
Estimate of Fair Value Measurement [Member] \| Fair Value, Measurements, Recurring [Member] \| Mortgage-backed Securities, Private-label residential [Member]
Assets:
Available-for-sale Securities		1,053	1,104
Estimate of Fair Value Measurement [Member] \| Interest rate swaps [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Derivative assets		322	334
Liabilities:
Derivative liabilities		$ 22	$ 21

[1]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty and includes fair value adjustments on derivatives for which variation margin is characterized as a daily settled contract. Cash collateral posted and related accrued interest was $441 and $507 as of March 31, 2018 and December 31, 2017 , respectively. Cash collateral received and related accrued interest was less than $1 and $34 as of March 31, 2018 and December 31, 2017
[2]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty.

Estimated Fair Values (Roll-for

Estimated Fair Values (Roll-forward of Level 3 Assets and Liabilities) (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - Available-for-Sale Securities, Private Label Residential Mortgage Backed Securities [Member] - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Reconciliation of Available-For-Sale Securities Measured at Fair Value
Balance, beginning of year		$ 1,104	$ 1,345
Included in other comprehensive income	[1]	(16)	0
Accretion of credit losses in net interest income	[1]	16	15
Settlements		(51)	(71)
Balance, end of year		$ 1,053	$ 1,289

[1]	Related to available-for-sale securities held at period end.

Estimated Fair Values (Fair Val

Estimated Fair Values (Fair Value Summary) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
Assets:
Cash and Due from Banks		$ 80	$ 2,357		$ 1,041	$ 1,815
Trading Securities		55	56
Available-for-sale Securities		1,053	1,104
Held-to-maturity Securities		26,930	25,162
Held-to-maturity securities, fair value		26,951	25,219
Loan to another FHLBank		0	200
Interest Receivable		235	208
Derivative assets		322	334
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1],[2]	279	125
Liabilities:
Interest Payable		144	142
Derivative liabilities		22	21
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1],[2]	(162)	(348)
Fair Value, Inputs, Level 1 [Member]
Assets:
Cash and Due from Banks		80	2,357
Interest-bearing deposits		0	0
Securities purchased under agreements to resell		0	0
Federal funds sold		0	0
Trading Securities		0	0
Available-for-sale Securities		0	0
Held-to-maturity securities, fair value		0	0
Advances		0	0
Mortgage loans held for portfolio, net		0	0
Loan to another FHLBank			0
Interest Receivable		0	0
Derivative assets		0	0
Grantor trust assets (included in Other assets)		49	48
Liabilities:
Interest-bearing deposits		0	0
Mandatorily redeemable capital stock		3	1
Interest Payable		0	0
Derivative liabilities		0	0
Fair Value, Inputs, Level 2 [Member]
Assets:
Cash and Due from Banks		0	0
Interest-bearing deposits		2,717	2,176
Securities purchased under agreements to resell		6,000	2,500
Federal funds sold		10,728	9,380
Trading Securities		55	56
Available-for-sale Securities		0	0
Held-to-maturity securities, fair value		26,412	24,643
Advances		91,742	102,446
Mortgage loans held for portfolio, net		442	467
Loan to another FHLBank			200
Accrued Interest Receivable, Fair Value Disclosure		235	208
Derivative assets		43	209
Grantor trust assets (included in Other assets)		0	0
Liabilities:
Interest-bearing deposits		1,213	1,177
Mandatorily redeemable capital stock		0	0
Interest Payable		144	142
Derivative liabilities		184	369
Fair Value, Inputs, Level 3 [Member]
Assets:
Cash and Due from Banks		0	0
Interest-bearing deposits		0	0
Securities purchased under agreements to resell		0	0
Federal funds sold		0	0
Trading Securities		0	0
Available-for-sale Securities		1,053	1,104
Held-to-maturity securities, fair value		539	576
Advances		0	0
Mortgage loans held for portfolio, net		0	0
Loan to another FHLBank			0
Interest Receivable		0	0
Derivative assets		0	0
Grantor trust assets (included in Other assets)		0	0
Liabilities:
Interest-bearing deposits		0	0
Mandatorily redeemable capital stock		0	0
Interest Payable		0	0
Derivative liabilities		0	0
Carrying Value [Member]
Assets:
Cash and Due from Banks		80	2,357
Interest-bearing deposits		2,717	2,176
Securities purchased under agreements to resell		6,000	2,500
Federal funds sold		10,728	9,380
Trading Securities		55	56
Available-for-sale Securities		1,053	1,104
Held-to-maturity Securities		26,930	25,162
Advances		91,733	102,440
Mortgage loans held for portfolio, net		416	435
Interest Receivable		235	208
Derivative assets		322	334
Grantor trust assets (included in Other assets)		49	48
Liabilities:
Interest-bearing deposits		1,213	1,177
Mandatorily redeemable capital stock		3	1
Interest Payable		144	142
Derivative liabilities		22	21
Estimate of Fair Value Measurement [Member]
Assets:
Cash and Due from Banks		80	2,357
Interest-bearing deposits		2,717	2,176
Securities purchased under agreements to resell		6,000	2,500
Federal funds sold		10,728	9,380
Trading Securities		55	56
Available-for-sale Securities		1,053	1,104
Held-to-maturity securities, fair value		26,951	25,219
Advances		91,742	102,446
Mortgage loans held for portfolio, net		442	467
Loan to another FHLBank			200
Accrued Interest Receivable, Fair Value Disclosure		235	208
Derivative assets		322	334
Grantor trust assets (included in Other assets)		49	48
Liabilities:
Interest-bearing deposits		1,213	1,177
Mandatorily redeemable capital stock		3	1
Accrued Interest Payable, Fair Value Disclosure		144	142
Derivative liabilities		22	21
Short-term Debt [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities:
Discount notes		0	0
Short-term Debt [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities:
Discount notes		54,652	50,132
Short-term Debt [Member] \| Fair Value, Inputs, Level 3 [Member]
Liabilities:
Discount notes		0	0
Short-term Debt [Member] \| Carrying Value [Member]
Liabilities:
Discount notes		54,659	50,139
Short-term Debt [Member] \| Estimate of Fair Value Measurement [Member]
Liabilities:
Discount notes		54,652	50,132
Consolidated Obligation Bonds [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities:
Bonds		0	0
Consolidated Obligation Bonds [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities:
Bonds		77,150	87,501
Consolidated Obligation Bonds [Member] \| Fair Value, Inputs, Level 3 [Member]
Liabilities:
Bonds		0	0
Consolidated Obligation Bonds [Member] \| Carrying Value [Member]
Liabilities:
Bonds		77,160	87,523
Consolidated Obligation Bonds [Member] \| Estimate of Fair Value Measurement [Member]
Liabilities:
Bonds		77,150	87,501
Fair Value, Measurements, Recurring [Member]
Assets:
Securities purchased under agreements to resell		0	0
Trading Securities		0	0
Available-for-sale Securities		0	0
Held-to-maturity securities, fair value		0	0
Derivative, Collateral, Right to Reclaim Cash		279	125	[2]
Grantor trust assets (included in Other assets)		0	0
Liabilities:
Mandatorily redeemable capital stock		0	0
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2]	(162)	(348)
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets:
Grantor trust assets (included in Other assets)		49	48
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets:
Grantor trust assets (included in Other assets)		0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets:
Grantor trust assets (included in Other assets)		0	0
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member]
Assets:
Grantor trust assets (included in Other assets)		49	48
Interest rate swap [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		279	125
Liabilities:
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(162)	(348)
Interest rate swap [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets:
Derivative assets		0	0
Liabilities:
Derivative liabilities		0	0
Interest rate swap [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets:
Derivative assets		43	209
Liabilities:
Derivative liabilities		184	369
Interest rate swap [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets:
Derivative assets		0	0
Liabilities:
Derivative liabilities		0	0
Interest rate swap [Member] \| Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member]
Assets:
Derivative assets		322	334
Liabilities:
Derivative liabilities		$ 22	$ 21

[1]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty and includes fair value adjustments on derivatives for which variation margin is characterized as a daily settled contract. Cash collateral posted and related accrued interest was $441 and $507 as of March 31, 2018 and December 31, 2017 , respectively. Cash collateral received and related accrued interest was less than $1 and $34 as of March 31, 2018 and December 31, 2017
[2]	Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty.

Commitments and Contingencies77

Commitments and Contingencies (Details) $ in Millions		Mar. 31, 2018USD ($)letter_of_credit	Dec. 31, 2017USD ($)letter_of_credit
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Number Of Outstanding Standby Letters Of Credit Renewable Annually \| letter_of_credit		16	16
Standby Letters Of Credit Issued Renewable Annually		$ 64	$ 59
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	[1]	10,490	9,520
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year		16,784	20,669
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability		27,274	30,189
Unsettled Consolidated Obligation Bonds [Member]
Loss Contingencies [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring Within One Year	[2]	95	3
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Expiring After One Year	[2]	0	0
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability	[2]	$ 95	$ 3

[1]	“Expire Within One Year” includes 16 standby letters of credit for a total of $64 and 16 standby letters of credit for a total of $59 as of March 31, 2018 and December 31, 2017
[2]	Expiration is based on settlement period rather than underlying contractual maturity of consolidated obligations.

Commitments and Contingencies78

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
The FHLBank's outstanding consolidated obligations for which the Bank is jointly and severally liable	$ 887,057	$ 896,441
Other liabilities	$ 284	219
CommitmentsToPurchaseMortgageLoansMaximumTerm	91 days
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Other liabilities	$ 91	$ 119

Transactions With Shareholder79

Transactions With Shareholders (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Minimum
Definition of related party, minimum percent	10.00%
Definition of shareholder concentration, percentage	10.00%
Regulatory Capital Stock Outstanding	$ 6,803	$ 7,157
Federal Home Loan Bank, Advances, Par Value	91,872	102,249
Navy Federal Credit Union [Member]
Minimum
Regulatory Capital Stock Outstanding		$ 675
Percent of Total Regulatory Capital Stock Outstanding		13.09%
Federal Home Loan Bank, Advances, Par Value		$ 15,530
Percent of Total Par Value Advances		15.19%
Interest-bearing Deposits		$ 195
Percent of Total Interest-bearing Deposits		16.58%
Bank of America [Member]
Minimum
Regulatory Capital Stock Outstanding	$ 1,227	$ 908
Percent of Total Regulatory Capital Stock Outstanding	25.82%	17.61%
Federal Home Loan Bank, Advances, Par Value	$ 28,510	$ 21,010
Percent of Total Par Value Advances	31.03%	20.55%
Interest-bearing Deposits	$ 0	$ 0
Percent of Total Interest-bearing Deposits	0.01%	0.01%