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Notes Payable (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Medium term notes called during the period | $ 3,100,000,000 | $ 1,500,000,000 |
Maximum borrowing capacity from U.S. Treasury | 1,500,000,000 |  |
Outstanding debt repurchases | $ 0 | 0 | $ 0
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 | 15 years |  |
Discount notes |  |  |
Debt Instrument [Line Items] |  |  |
Maximum amount of discount notes outstanding at any month end | $ 2,600,000,000 | $ 2,300,000,000 |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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