Benefit Plans - Stock Option and Share Plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Option and Share Plans [Abstract]
Allocated stock option and share plan expenses	$ 31	$ 29	$ 30
Tax benefit from allocated stock option and share plan expenses	$ 7	$ 6	$ 11
ING 401(k) Plan for VRIAC Agents
Stock Option and Share Plans [Abstract]
Maximum annual contribution per employee	60.00%
Company match, percentage of participant's eligible compensation	6.00%

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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