Share-Based Incentive Compensation Plans (Details) (USD $)			3 Months Ended		3 Months Ended		3 Months Ended				3 Months Ended		3 Months Ended		0 Months Ended					0 Months Ended	3 Months Ended
	Mar. 31, 2014 Omnibus Plan	May 07, 2013 Omnibus Plan	Mar. 31, 2014 Omnibus Plan Performance shares	Dec. 31, 2013 Omnibus Plan Performance shares	Mar. 31, 2014 Omnibus Plan Restricted Stock Units (RSUs)	Dec. 31, 2013 Omnibus Plan Restricted Stock Units (RSUs)	Mar. 31, 2014 Omnibus Plan RSUs - Deal incentive awards		Dec. 31, 2013 Omnibus Plan RSUs - Deal incentive awards		Mar. 31, 2014 Equity Compensation Plan Converted to Omnibus Plan Restricted Stock Units (RSUs)	Mar. 25, 2014 Deal Incentive Awards Converted to Omnibus Plan Restricted Stock Units (RSUs) Share-based Compensation Award, Tranche Two	Mar. 31, 2014 Deal Incentive Awards Converted to Omnibus Plan Restricted Stock Units (RSUs) Share-based Compensation Award, Tranche Three	May 07, 2013 2013 Non-Employee Director Incentive Plan	Jun. 13, 2013 2013 Non-Employee Director Incentive Plan Cliff Vesting, Year One Non-Employee Directors	Jun. 13, 2013 2013 Non-Employee Director Incentive Plan Cliff Vesting, Year Two Non-Employee Directors	Jun. 13, 2013 2013 Non-Employee Director Incentive Plan Cliff Vesting, Year Three Non-Employee Directors	Mar. 31, 2014 Phantom Stock Plan Phantom Share Units (PSUs)	Mar. 31, 2014 Phantom Stock Plan Phantom Performance Shares	May 07, 2013 Long-term Sustainable Performance Plan Annual Vesting Non-Identified Staff	Mar. 31, 2014 Long-term Sustainable Performance Plan Performance shares	Mar. 31, 2014 ING Group Share-based Compensation Plans Restricted Stock Units (RSUs)	Mar. 31, 2014 Minimum Omnibus Plan Performance shares	Mar. 31, 2014 Minimum Omnibus Plan Restricted Stock Units (RSUs)	Mar. 31, 2014 Maximum Omnibus Plan Performance shares	Mar. 31, 2014 Maximum Omnibus Plan Restricted Stock Units (RSUs)	Mar. 25, 2014 ING Group	Oct. 29, 2013 ING Group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance		7,650,000												88,000
Shares available for grant	102,408
Vesting percentage of grant																							0.00%		150.00%
Award vesting period											3 years											3 years	1 year	1 year	4 years	4 years
Number of stock options outstanding	0
Number of awards vested during period												849,555	165,642
Vested awards, weighted average grant date fair value			$ 28.06		$ 19.29		$ 19.50	[1]					$ 30.03
Share-based payment award, vesting percentage															50.00%	25.00%	25.00%			33.33%
Number of units granted			700,000	500,000	3,300,000	1,600,000	0	[1]	800,000	[1]								183,874	99,160
Percentage of vested awards delivered																					33.33%
Ownership by affiliate of parent company																											43.00%	57.00%

[1] Excludes 273,504 RSUs granted in 2013 that proportionally vest upon sales of Company stock by ING Group.