Derivatives and Hedging Activities (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments Gain (Loss)
Number of interest rate swaps held	3
Summary of unrealized derivatives gains (losses) included in accumulated other comprehensive income (loss) related to cash flow hedges
Net unrealized derivatives gains (losses), at the beginning of the period	$ (11)	$ 18	$ 3
Holding gains (losses)	14	(10)	36
Reclassification of realized gains	(1)	(34)	(13)
Income tax benefit (provision)	(4)	15	(8)
Net unrealized derivatives gains (losses), at the end of the period	(2)	(11)	18
Cash flow hedges
Derivative Instruments Gain (Loss)
Cash flow hedge, Gain (Loss) Reclassified from Accumulated Other Comprehensive Income to Other revenues	3	27
Gain recognized in earnings related to cash flow hedges due to ineffectiveness	1
Estimated reclassification of net pretax losses on cash flow hedges from accumulated other comprehensive income to earnings during the next 12 months	1
Reclassification of net pretax gains, to be recorded as a reduction to interest and debt expense in the next 12 months	5
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	(10)	36
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income	1	34	13
Hedging exposure to the variability in future cash flows	23 years
Cash flow hedges | Distribution fees
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income		9	11
Cash flow hedges | Net investment income
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Reclassified from Accumulated other Comprehensive Income into Income	(6)	(6)	(6)
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	4	4	8
Cash flow hedges | Interest on debt
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	14	(11)	16
Cash flow hedges | Asset-based distribution fees
Derivative Instruments Gain (Loss)
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives		1	20
Fair value hedges | Fixed rate debt | Interest and debt expense
Derivative Instruments Gain (Loss)
Amount of Gain Recognized in Income on Derivatives	$ 37	$ 41	$ 36