Derivative Financial Instruments (Details Textual) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Derivative Financial Instruments (Additional Textual) [Abstract]
Notional values of derivative contracts	$ 30,939,000,000	$ 40,854,000,000
Derivative Financial Instruments (Textual) [Abstract]
Collateral held by third party swap	12,000,000	10,000,000
Fair value of our agreements with affiliate counterparties required the affiliate to provide collateral	337,000,000	584,000,000
Increase in debt carrying value due to fair value hedge	7,000,000	36,000,000
Gains and losses on current derivative instruments designated as cash flow hedges are reported in OCI net of tax and totaled a loss	(406,000,000)	(448,000,000)
Unrealized net losses on cash flow hedges	240,000,000
Unrealized net losses on cash flow hedges after tax	155,000,000
Termination of non-qualifying hedge	4,200,000,000
HSBC Bank USA [Member]
Derivative Financial Instruments (Additional Textual) [Abstract]
Notional values of derivative contracts	$ 30,500,000,000	$ 40,400,000,000