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Notes Payable - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |
Medium term notes called during the period |  |  | $ 1,700,000,000 | $ 2,700,000,000
Maximum borrowing capacity from U.S. Treasury | $ 1,500,000,000 |  | 1,500,000,000 |
Outstanding debt repurchases | 23,000,000 | $ 0 | 23,000,000 | 0
Gain on extinguishment of debt | $ 14,000 |  | $ 14,000 |
Discount Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturities of notes |  |  | 1 year |
Medium-term notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturities of notes |  |  | 6 months |
Medium-term notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maturities of notes |  |  | 25 years |
Discount notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum amount of discount notes outstanding at any month end |  |  | $ 2,400,000,000 | $ 2,600,000,000

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