Fair Value (Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | $ 2,816 | $ 1,169 |
Debt Securities, Available-for-sale | 14,602 | 13,389 |
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | 271 | 146 |
Derivative assets, net | 522 | 221 |
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | 200 | 176 |
Derivative liabilities, net | (4) | (3) |
Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
Derivative assets, net | 0 | 0 |
Other assets | 32 | 44 |
Derivative liabilities, net | 0 | 0 |
Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 2,816 | 1,169 |
Debt Securities, Available-for-sale | 14,602 | 13,389 |
Derivative assets, net | 251 | 75 |
Other assets | 0 | 0 |
Derivative liabilities, net | (204) | (179) |
Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
Derivative assets, net | 0 | 0 |
Other assets | 0 | 0 |
Derivative liabilities, net | 0 | 0 |
Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | 271 | 146 |
Derivative assets, net | 522 | |
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | 200 | 176 |
Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
Derivative assets, net | 0 | |
Other assets | 32 | 44 |
Total recurring assets | 32 | 44 |
Derivative liabilities, net | 0 | |
Total recurring liabilities | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 2,816 | 1,169 |
Debt Securities, Available-for-sale | 14,602 | 13,389 |
Derivative assets, net | 251 | |
Other assets | 0 | 0 |
Total recurring assets | 17,669 | 14,633 |
Derivative liabilities, net | (204) | |
Total recurring liabilities | (35,482) | (22,527) |
Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
Derivative assets, net | 0 | |
Other assets | 0 | 0 |
Total recurring assets | 0 | 0 |
Derivative liabilities, net | 0 | |
Total recurring liabilities | 0 | 0 |
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset | 271 | 146 |
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset | 200 | 176 |
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, net | 0 | 0 |
Derivative liabilities, net | 0 | 0 |
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, net | 249 | 75 |
Derivative liabilities, net | (201) | (179) |
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, net | 0 | 0 |
Derivative liabilities, net | 0 | 0 |
Forward Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, net | 0 | |
Forward Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, net | 2 | |
Forward Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, net | 0 | |
Fair Value [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 2,816 | 1,169 |
Debt Securities, Available-for-sale | 14,602 | 13,389 |
Derivative assets, net | 522 | 221 |
Other assets | 32 | 44 |
Derivative liabilities, net | (4) | (3) |
Fair Value [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 2,816 | 1,169 |
Debt Securities, Available-for-sale | 14,602 | 13,389 |
Other assets | 32 | 44 |
Total recurring assets | 17,972 | 14,823 |
Derivative liabilities, net | (4) | |
Total recurring liabilities | (35,282) | (22,351) |
Fair Value [Member] | Interest Rate Swap [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, net | 520 | 221 |
Derivative liabilities, net | (1) | (3) |
Fair Value [Member] | Forward Contracts [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, net | 2 | |
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Discount notes | 0 | 0 |
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Discount notes | (64,160) | (22,348) |
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Discount notes | 0 | 0 |
Consolidated Obligation Discount Notes [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Discount notes | 0 | 0 |
Consolidated Obligation Discount Notes [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Discount notes | (35,278) | (22,348) |
Consolidated Obligation Discount Notes [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Discount notes | 0 | 0 |
Consolidated Obligation Discount Notes [Member] | Fair Value [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Discount notes | (64,160) | (22,348) |
US Treasury Securities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 2,483 | 496 |
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 2,483 | 496 |
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
US Treasury Securities [Member] | Fair Value [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 2,483 | 496 |
U.S. obligations [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 78 | 102 |
Debt Securities, Available-for-sale | 846 | 1,156 |
U.S. obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
U.S. obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 78 | 102 |
Debt Securities, Available-for-sale | 846 | 1,156 |
U.S. obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
U.S. obligations [Member] | Fair Value [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 78 | 102 |
Debt Securities, Available-for-sale | 846 | 1,156 |
GSE obligations [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 50 | 60 |
Debt Securities, Available-for-sale | 475 | 983 |
GSE obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
GSE obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 50 | 60 |
Debt Securities, Available-for-sale | 475 | 983 |
GSE obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
GSE obligations [Member] | Fair Value [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 50 | 60 |
Debt Securities, Available-for-sale | 475 | 983 |
State or local housing agency obligations [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 469 | 488 |
State or local housing agency obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 0 | 0 |
State or local housing agency obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 469 | 488 |
State or local housing agency obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 0 | 0 |
State or local housing agency obligations [Member] | Fair Value [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 469 | 488 |
Other [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 160 | 201 |
Debt Securities, Available-for-sale | 245 | 288 |
Other [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
Other [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 160 | 201 |
Debt Securities, Available-for-sale | 245 | 288 |
Other [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
Other [Member] | Fair Value [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 160 | 201 |
Debt Securities, Available-for-sale | 245 | 288 |
U.S. obligations MBS [Member] | Single Family [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 3,334 | 2,909 |
U.S. obligations MBS [Member] | Single Family [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 0 | 0 |
U.S. obligations MBS [Member] | Single Family [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 3,334 | 2,909 |
U.S. obligations MBS [Member] | Single Family [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 0 | 0 |
U.S. obligations MBS [Member] | Single Family [Member] | Fair Value [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 3,334 | 2,909 |
Mortgage-backed securities, GSE [Member] | Single Family [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 220 | 277 |
Mortgage-backed securities, GSE [Member] | Single Family [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 0 | 0 |
Mortgage-backed securities, GSE [Member] | Single Family [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 220 | 277 |
Mortgage-backed securities, GSE [Member] | Single Family [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 0 | 0 |
Mortgage-backed securities, GSE [Member] | Single Family [Member] | Fair Value [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Debt Securities, Available-for-sale | 220 | 277 |
Mortgage-backed securities, GSE [Member] | Multifamily [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 45 | 310 |
Debt Securities, Available-for-sale | 9,013 | 7,288 |
Mortgage-backed securities, GSE [Member] | Multifamily [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
Mortgage-backed securities, GSE [Member] | Multifamily [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 45 | 310 |
Debt Securities, Available-for-sale | 9,013 | 7,288 |
Mortgage-backed securities, GSE [Member] | Multifamily [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 0 | 0 |
Debt Securities, Available-for-sale | 0 | 0 |
Mortgage-backed securities, GSE [Member] | Multifamily [Member] | Fair Value [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Trading securities | 45 | 310 |
Debt Securities, Available-for-sale | 9,013 | 7,288 |
Mortgages [Member] | Forward Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, net | 0 | |
Mortgages [Member] | Forward Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, net | (3) | |
Mortgages [Member] | Forward Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, net | 0 | |
Mortgages [Member] | Fair Value [Member] | Forward Contracts [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, net | (3) | |
Fair Value Option Election | Consolidated Obligation Discount Notes [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Discount notes | 35,278 | 22,348 |
Fair Value Option Election | Consolidated Obligation Discount Notes [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Discount notes | $ (35,278) | $ (22,348) |