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