Derivatives and Hedging Activities (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Derivatives and Hedging Activities (Textuals) [Abstract]
Net reduction in interest expense on long term debt and other	$ 127	$ 127	$ 377	$ 377
Net pretax losses on derivatives reclassified from AOCI into earnings			0
Shares held in equity investment	474.7		474.7		605.4
Derivative [Line Items]
Equity investment	281		281		360
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Derivative [Line Items]
Equity investment	280		280		359
Fair Value Hedging [Member]
Derivative [Line Items]
Notional amount of long-term debt	20,000		20,000		17,100
Cash flow hedges [Member]
Derivative [Line Items]
Notional amount of long-term debt	0		0		305
Net investment hedges [Member]
Derivative [Line Items]
Effective portion of gain (loss) on hedges	$ (320)	$ 181	$ (294)	$ (41)