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Derivatives and Hedging Activities (Details Textuals) (USD $)
Share data in Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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| Derivatives and Hedging Activities (Textuals) [Abstract] | |||||
| Net reduction in interest expense on long term debt and other | $ 76,000,000 | $ 127,000,000 | $ 280,000,000 | $ 377,000,000 | |
| Net pretax losses on derivatives reclassified from AOCI into earnings | 0 | ||||
| Derivative asset not offset | 0 | 0 | 0 | ||
| Derivative liabilities not offset | 0 | 0 | 0 | ||
| Derivative [Line Items] | |||||
| Equity investment | 168,000,000 | 168,000,000 | 296,000,000 | ||
| Margin On Interest Rate Swap Not Netted | 33,000,000 | 33,000,000 | 0 | ||
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ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
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| Derivative [Line Items] | |||||
| Equity investment | 167,000,000 | 167,000,000 | 295,000,000 | ||
| Shares held in equity investment | 239.5 | 239.5 | 415.9 | ||
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Fair Value Hedges [Member]
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| Derivative [Line Items] | |||||
| Notional amount of long-term debt | 14,700,000,000 | 14,700,000,000 | 18,400,000,000 | ||
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Net Investment Hedges [Member]
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| Derivative [Line Items] | |||||
| Effective portion of gain (loss) on hedges | (123,000,000) | (320,000,000) | 160,000,000 | (294,000,000) | |
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Credit Valuation Adjustment [Member]
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| Derivative [Line Items] | |||||
| Notional amount of long-term debt | $ 0 | $ 0 | $ 0 | ||