Derivatives and Hedging Activities (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cash flow hedges
Derivative Instruments Gain (Loss)
Cash flow hedge, Gain (Loss) Reclassified from Accumulated Other Comprehensive Income to Other revenues			$ 3	$ 27
Estimated reclassification of net losses on cash flow hedges from accumulated other comprehensive income to earnings during the next 12 months			(2)
Reclassification of net pretax gains, to be recorded as a reduction to interest and debt expense in the next 12 months			4
Reclassification of net pretax losses, to be recorded in net investment income in the next 12 months			(6)
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives			14	1
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income	(1)		1	35
Hedging exposure to the variability in future cash flows	23 years
Cash flow hedges | Other revenues
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income			3	27
Cash flow hedges | Interest and debt expense
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income	1	1	3	3
Cash flow hedges | Distribution fees
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income				9
Cash flow hedges | Net investment income
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income	(2)	(1)	(5)	(4)
Cash flow hedges | Interest on debt
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives			14
Cash flow hedges | Asset-based distribution fees
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives				1
Fair value hedges
Derivative Instruments Gain (Loss)
Number of interest rate swaps held	3		3
Fair value hedges | Fixed rate debt | Interest and debt expense
Derivative Instruments Gain (Loss)
Amount of Gain Recognized in Income on Derivatives	$ 9	$ 11	$ 28	$ 31