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Derivatives and Hedging Activities (Details Textuals) - USD ($) shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Derivatives and Hedging Activities (Textuals) [Abstract] |  |  |  |  |
Net reduction in interest expense on long term debt and other | $ 59,000,000 | $ 71,000,000 | $ 118,000,000 | $ 140,000,000 |
Derivative asset not offset |  |  |  |  | $ 8
Shares held in equity investment sold | 0.0 |  | 0.0 |  |
Margin On Interest Rate Swap Not Netted | $ 159,000,000 |  | $ 159,000,000 |  | 149,000,000
Derivative [Line Items] |  |  |  |  |
Equity investment | 1,000,000 |  | 1,000,000 |  | 1,000,000
Effective portion of gain (loss) on hedges | 135,000,000 | (34,000,000) | 43,000,000 | 161,000,000 |
Net hedge ineffectiveness | 0 |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net |  | 87,000,000 |  | 381,000,000 |
Not Sold Or Repledged [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Securities received as collateral | 30,000,000 |  | 30,000,000 |  | 0
Risk Exposure Low [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Total derivative assets, net | 583,000,000 |  | 583,000,000 |  |
Other Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) in Changes of Fair Value of Derivatives not designated as hedges | 6,000,000 | 8,000,000 | 8,000,000 | 105,000,000 |
Gain on embedded derivatives | 0 | $ 4,000,000 | 6,000,000 | $ 3,000,000 |
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Equity investment | 0 |  | 0 |  |
Fair Value Hedges [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of long-term debt | 20,250,000,000 |  | 20,250,000,000 |  | $ 18,800,000,000
Net Investment Hedging [Member] | Other Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount reclassified from AOCI into income | 0 |  |  |  |
Net hedge ineffectiveness | 0 |  |  |  |
Net Investment Hedging [Member] | Net Investment Hedging [Member] | Other Expense [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount reclassified from AOCI into income | 0 |  |  |  |
Credit Valuation Adjustment [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of long-term debt | $ 0 |  | $ 0 |  |

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