Accumulated Other Comprehensive Income (Loss) Accumulated Other Compreensive Income (Loss) - Reclassification out of Accumulated OTher Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest rate and currency swaps	$ (379)		$ (499)
Derivative loss recognized on termination of hedge relationship	(100)		205
Tax expense (benefit)	(73)		(3)
Net income (loss)	132		5
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Tax expense (benefit)	(73)	[1]
Net income (loss)	(132)	[1]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest rate and currency swaps	(6)	[1]
Derivative loss recognized on termination of hedge relationship	(199)	[1]
Income (loss) from continuing operations before income tax	$ (205)	[1]

[1] The amount reclassified for the three months ended March 31, 2013 is included in income (loss) from discontinued operations in our consolidated statement of income (loss).