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Derivatives and Hedging Activities (Details Textuals) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Derivatives and Hedging Activities (Textuals) [Abstract] |  |  |  |  |
Net reduction in interest expense on long term debt and other | $ 55.0 | $ 73.0 | $ 173.0 | $ 214.0 |
Shares held in equity investment sold | 0.0 |  | 0.0 |  |
Margin On Interest Rate Swap Not Netted | $ 144.0 |  | $ 144.0 |  | $ 149.0
Derivative [Line Items] |  |  |  |  |
Notional amount of long-term debt | 17.0 |  | 17.0 |  | 18.8
Equity investment | 49.0 |  | 49.0 |  | 50.0
Effective portion of gain (loss) on hedges | 18.0 | 384.0 | 25.0 | 545.0 |
Net hedge ineffectiveness | 0.0 |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net |  | 8.0 |  | 389.0 |
Not Sold Or Repledged [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Securities received as collateral | 24.0 |  | 24.0 |  | 0.0
Risk Exposure Low [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Total derivative assets, net | 0.0 |  | 0.0 |  |
Other Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) in Changes of Fair Value of Derivatives not designated as hedges | (4.0) | (3.0) | (12.0) | 102.0 |
Gain on embedded derivatives | 1.0 | $ (4.0) | 7.0 | $ (2.0) |
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Equity investment | 0.0 |  | 0.0 |  |
Fair Value Hedges [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of long-term debt | 0.0 |  | 0.0 |  | $ 0.0
Net Investment Hedging [Member] | Other Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount reclassified from AOCI into income | 0.0 |  |  |  |
Net hedge ineffectiveness | 0.0 |  |  |  |
Net Investment Hedging [Member] | Net Investment Hedging [Member] | Other Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount reclassified from AOCI into income | 0.0 |  |  |  |
Credit Valuation Adjustment [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of long-term debt | $ 1.0 |  | $ 1.0 |  |

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