Segment Information (Details) $ in Millions		3 Months Ended
		Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segment		2
Adjusted Net Interest Income		$ 75	$ 154
Amortization of Basis Adjustments and Gain/Loss on Fair Value Hedges	[1]	71	11
Income/(Expense) on Economic Hedges	[2]	(8)	(5)
Interest Expense on Mandatorily Redeemable Capital Stock	[3]	2	4
Net Interest Income After Provision for/(Reversal of) Credit Losses		10	144
Other Income/ (Loss)		18	15
Other Expense		36	43
Income/(Loss) Before AHP Assessment		(8)	116
OTTI PLRMBS, Total accretion or amortization recognized in interest income		20	18
Provision for Loan, Lease, and Other Losses		39	0
Net OTTI loss, credit-related			1
Assets		124,870		$ 106,842
Advances- Related Business
Segment Reporting Information [Line Items]
Adjusted Net Interest Income		63	86
Assets		103,877		85,709
Mortgage- Related Business
Segment Reporting Information [Line Items]
Adjusted Net Interest Income	[4]	12	$ 68
Assets		$ 20,993		$ 21,133

[1] Represents amortization of amounts deferred for adjusted net interest income purposes only

[2] The Bank includes income and expense associated with net settlements from economic hedges in adjusted net interest income in its analysis of financial performance for its two operating segments. For financial reporting purposes, the Bank does not include these amounts in net interest income in the Statements of Income, but instead records them in other income in “Net gain/(loss) on derivatives and hedging activities.”

[3] The Bank excludes interest expense on mandatorily redeemable capital stock from adjusted net interest income in its analysis of financial performance for its two operating segments

[4] The mortgage-related business includes total accretion or amortization associated with other-than-temporarily impaired PLRMBS, which are recognized in interest income, and totaled $20 and $18 for the three months ended March 31, 2020 and 2019, respectively. The mortgage-related business includes a provision for credit losses of $39 for the three months ended March 31, 2020. The mortgage-related business does not include credit-related OTTI losses of $1 for the three months ended March 31, 2019.