Derivatives and Hedging Activities (Details Textuals) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Derivatives and Hedging Activities (Textuals) [Abstract]
Net reduction in interest expense on long term debt and other	$ 73,000,000	$ 74,000,000	$ 214,000,000	$ 217,000,000
Derivative asset not offset	0		0		$ 0
Derivative liabilities not offset	0		0		0
Margin On Interest Rate Swap Not Netted	155,000,000		155,000,000		114,000,000
Derivative [Line Items]
Equity investment	1,000,000		1,000,000		1,000,000
Net hedge ineffectiveness	0		1,000,000
Not Sold Or Repledged [Member]
Derivative [Line Items]
Securities received as collateral	0		0		91,000,000
Fair Value Hedges [Member]
Derivative [Line Items]
Notional amount of long-term debt	18,500,000,000		18,500,000,000		17,600,000,000
Net Investment Hedging [Member]
Derivative [Line Items]
Effective portion of gain (loss) on hedges	384,000,000	246,000,000	545,000,000	113,000,000
Net Investment Hedging [Member] | Net Investment Hedging [Member] | Other Expense [Member]
Derivative [Line Items]
Amount reclassified from AOCI into income	0	$ (1,000,000)	1,000,000	$ 9,000,000
Credit Valuation Adjustment [Member]
Derivative [Line Items]
Notional amount of long-term debt	$ 0		$ 0		$ 0