Derivatives and Hedging Activities (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Derivatives and Hedging Activities (Textuals) [Abstract]
Net reduction in interest expense on long term debt and other	$ 127	$ 126	$ 250	$ 251
Net pretax losses on derivatives reclassified from AOCI into earnings			0
Shares held in equity investment	523.7		523.7		605.4
Derivative [Line Items]
Equity investment	290		290		360
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Derivative [Line Items]
Equity investment	290		290		359
Fair Value Hedging [Member]
Derivative [Line Items]
Notional amount of long-term debt	19,900		19,900		17,100
Cash flow hedges [Member]
Derivative [Line Items]
Notional amount of long-term debt	301		301		305
Net investment hedges [Member]
Derivative [Line Items]
Effective portion of gain (loss) on hedges	$ 276	$ (70)	$ 26	$ (292)