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Guarantees and Long Term Standby Purchase Commitments - Long Term Standby Purchase Commitments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Long-Term Standby Purchase Commitments [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 3,100.0 | $ 2,800.0
Weighted average remaining maturity, Loans underlying guarantees not held by transferor | 15 years 1 month 10 days | 14 years 7 months 10 days
Guarantee obligations issued after January 1, 2003 [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 4,900.0 | $ 4,500.0
Guarantee obligations issued after January 1, 2003 [Member] | Long-Term Standby Purchase Commitments [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Guarantor Obligations, Current Carrying Value | 31.8 | 30.3
Farm & Ranch Loans and USDA Guarantees [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Loans and Leases Receivable, Commitments to Purchase or Sell | 114.5 | 60.9
Rural Utilities Loans [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Loans and Leases Receivable, Commitments to Purchase or Sell | $ 0.0 | $ 4.0

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- Definition Weighted average remaining maturity, Loans underlying guarantees not held by transferor + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Reflects the carrying amount of loans and leases for which agreements to acquire or dispose exist. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064133&loc=d3e61044-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68064133&loc=d3e61082-112788 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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