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Derivatives Derivatives, Volume of Activity (Details) | 6 Months Ended
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Jun. 30, 2016 USD ($)
Derivative [Line Items] |  |
Beginning of Period Notional Amount | $ 9,680,000,000 |
Notional Amount of Derivative Instruments Added | 1,250,000,000 |
Notional Amount of Derivative Instruments Terminated | (2,850,000,000) |
End of Period Notional Amount | 8,080,000,000 |
Receive-fixed interest rate swap |  |
Derivative [Line Items] |  |
Beginning of Period Notional Amount | 425,000,000 |
Notional Amount of Derivative Instruments Added | 0 |
Notional Amount of Derivative Instruments Terminated | 0 |
End of Period Notional Amount | 425,000,000 |
Pay-fixed interest rate swap |  |
Derivative [Line Items] |  |
Beginning of Period Notional Amount | 2,955,000,000 |
Notional Amount of Derivative Instruments Added | 1,250,000,000 |
Notional Amount of Derivative Instruments Terminated | (2,850,000,000) |
End of Period Notional Amount | 1,355,000,000 | [1]
Eurodollar Future |  |
Derivative [Line Items] |  |
Beginning of Period Notional Amount | 6,300,000,000 |
Notional Amount of Derivative Instruments Added | 0 |
Notional Amount of Derivative Instruments Terminated | 0 |
End of Period Notional Amount | 6,300,000,000 |
Forward Contracts [Member] | Pay-fixed interest rate swap |  |
Derivative [Line Items] |  |
End of Period Notional Amount | $ 625,000 | [1]
[1] | The notional amount of pay-fixed interest rate swaps that were forward starting as of June 30, 2016 was $625,000.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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