Derivatives and Hedging Activities (Details Textuals) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Derivatives and Hedging Activities (Textuals) [Abstract]
Net reduction in interest expense on long term debt and other	$ 76,000,000	$ 127,000,000	$ 280,000,000	$ 377,000,000
Net pretax losses on derivatives reclassified from AOCI into earnings			0
Derivative asset not offset	0		0		0
Derivative liabilities not offset	0		0		0
Derivative [Line Items]
Equity investment	168,000,000		168,000,000		296,000,000
Margin On Interest Rate Swap Not Netted	33,000,000		33,000,000		0
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Derivative [Line Items]
Equity investment	167,000,000		167,000,000		295,000,000
Shares held in equity investment	239.5		239.5		415.9
Fair Value Hedges [Member]
Derivative [Line Items]
Notional amount of long-term debt	14,700,000,000		14,700,000,000		18,400,000,000
Net Investment Hedges [Member]
Derivative [Line Items]
Effective portion of gain (loss) on hedges	(123,000,000)	(320,000,000)	160,000,000	(294,000,000)
Credit Valuation Adjustment [Member]
Derivative [Line Items]
Notional amount of long-term debt	$ 0		$ 0		$ 0