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			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest rate and currency swaps	$ (328)		$ (416)	$ (1,060)		$ (1,382)
Derivative loss recognized on termination of hedge relationship	1		(42)	87		(261)
Income (loss) from discontinued operations before income tax	(33)		(36)	(228)		2,685
Other income	8		35	(70)		27
Net income (loss)	167		(137)	613		(550)
Unrealized gains (losses) on cash flow hedging instruments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest rate and currency swaps	(3)	[1]		(12)	[1]
Derivative loss recognized on termination of hedge relationship				(199)	[1]
Total before tax	(3)	[1]		(211)	[1]
Tax expense (benefit)	(1)	[1]		(75)	[1]
Net income (loss)	(2)	[1]		(136)	[1]
Foreign currency translation adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax				(15)	[1]
Tax expense (benefit)				(9)	[1]
Net income (loss)				(6)	[1]
Foreign currency translation adjustments [Member] | Sale of Insurance Business [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from discontinued operations before income tax				(24)	[1]
Foreign currency translation adjustments [Member] | Closure of Foreign Legal Entity [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other income				$ 9	[1]

[1] Amounts in parenthesis indicate expenses recognized in the consolidated statement of income (loss).