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Guarantees - Schedule of Long-Term Standby Purchase Commitments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Long-Term Standby Purchase Commitments |  |
Guarantor Obligations [Line Items] |  |
Maximum principal amount | $ 3,002,349 | $ 3,163,059
Weighted-average remaining maturity | 15 years 2 months 12 days | 15 years 3 months 18 days
Guarantee obligations issued after January 1, 2003 |  |
Guarantor Obligations [Line Items] |  |
Maximum principal amount | $ 3,500,000 | $ 4,000,000
Guarantee obligations issued after January 1, 2003 | Long-Term Standby Purchase Commitments |  |
Guarantor Obligations [Line Items] |  |
Guarantee and commitment obligation | 34,470 | 35,880
Guarantee obligations issued prior to January 1, 2003 |  |
Guarantor Obligations [Line Items] |  |
Maximum principal amount | $ 15,500 | $ 23,800

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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