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Derivatives and Hedging Activities (Details Textuals) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Derivatives and Hedging Activities (Textuals) [Abstract] |  |  |
Net reduction in interest expense on long term debt and other | $ 122 | $ 125 |
Net pretax losses on derivatives reclassified from AOCI into earnings | 0.3 |  |
Shares held in equity investment | 572.7 |  | 605.4
Derivative [Line Items] |  |  |
Equity investment | 371 |  | 360
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Derivative [Line Items] |  |  |
Equity investment | 369 |  | 359
Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of long-term debt | 18,700 |  | 17,100
Cash flow hedges [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of long-term debt | $ 315 |  | $ 305

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