Derivatives and Hedging Activities (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flow hedges
Derivative Instruments Gain (Loss)
Cash flow hedge, Gain (Loss) Reclassified from Accumulated Other Comprehensive Income to Other revenues	$ 3
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	2	5
Hedging exposure to the variability in future cash flows (in years)	24 years
Cash flow hedges | Other revenues
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income	3
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
Cash flow hedges | Distribution fees
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income		5
Cash flow hedges | Net investment income
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income	(2)	(1)
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
Fair value hedges | Fixed rate debt | Interest and debt expense
Derivative Instruments Gain (Loss)
Amount of Gain Recognized in Income on Derivatives	$ 9	$ 10