Retirement Plans and Profit Sharing Arrangements (Defined Contribution Plan) (Details 8) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of employees' gross pay	5.00%
Employer contribution requisite service period	60 days
United States [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	$ 49	$ 48	$ 47
Non-US [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	$ 5	$ 6	$ 6
Ameriprise Financial Inc 401(k) Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Period of graded schedule for vesting of employer contributions	5 years