Retirement Plans and Profit Sharing Arrangements (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Threadneedle Profit Sharing Arrangements
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax	$ 71	$ (23)	$ (77)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	(2)	(2)	(2)
Summary of unrealized losses included in other comprehensive income
Net unrealized defined benefit losses at the beginning of the period	(91)	(75)	(24)
Income tax benefit	(24)	9	28
Net unrealized defined benefit losses at the end of the period	(46)	(91)	(75)
Defined Contribution Plan
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	5.00%
Defined Contribution Plan Employer Contribution Requisite Service Period	60 days
Period of graded schedule for vesting match contributions	5 years
Defined contribution plan expense	35	36	33
Profit sharing plan
Defined Benefit, Threadneedle Profit Sharing Plan [Abstract]
Percentage of profit sharing	30.00%
Compensation expense (benefit) related to the employee profit sharing plan	$ 69	$ 67	$ 54