Derivatives and Hedging Activities (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Derivatives and Hedging Activities (Textuals) [Abstract]
Net reduction in interest expense on long term debt and other	$ 91	$ 127	$ 203	$ 250
Net pretax losses on derivatives reclassified from AOCI into earnings			0
Shares held in equity investment	298.3		298.3		415.9
Derivative [Line Items]
Equity investment	189		189		296
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Derivative [Line Items]
Equity investment	188		188		295
Fair Value Hedges [Member]
Derivative [Line Items]
Notional amount of long-term debt	14,800		14,800		18,400
Cash Flow Hedges [Member]
Derivative [Line Items]
Notional amount of long-term debt	0		0		0
Net Investment Hedges [Member]
Derivative [Line Items]
Effective portion of gain (loss) on hedges	$ 339	$ 276	$ 283	$ 26