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Goodwill & Other Intangible Assets - Goodwill Carrying Value (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 1,290,000,000	$ 567,000,000
Goodwill related to acquisitions	0	723,000,000
Ending balance	1,290,000,000	1,290,000,000	$ 567,000,000
Goodwill, Impairment Loss	$ 0	0	0
Number of Reporting Units	5
Operating Segments | Commercial Lines
Goodwill [Roll Forward]
Beginning balance	$ 38,000,000	38,000,000
Goodwill related to acquisitions	0	0
Ending balance	38,000,000	38,000,000	38,000,000
Operating Segments | Personal Lines
Goodwill [Roll Forward]
Beginning balance	119,000,000	119,000,000
Goodwill related to acquisitions	0	0
Ending balance	119,000,000	119,000,000	119,000,000
Operating Segments | Hartford Funds
Goodwill [Roll Forward]
Beginning balance	180,000,000	180,000,000
Goodwill related to acquisitions	0	0
Ending balance	180,000,000	180,000,000	180,000,000
Operating Segments | Group Benefits
Goodwill [Roll Forward]
Beginning balance	723,000,000	0
Goodwill related to acquisitions	0	723,000,000
Ending balance	723,000,000	723,000,000	0
Corporate
Goodwill [Roll Forward]
Beginning balance	230,000,000	230,000,000
Goodwill related to acquisitions	0	0
Ending balance	230,000,000	230,000,000	230,000,000
Corporate | Group Benefits
Goodwill [Roll Forward]
Beginning balance	138,000,000	138,000,000
Ending balance	138,000,000	138,000,000	138,000,000
Corporate | Hartford Funds
Goodwill [Roll Forward]
Beginning balance	92,000,000	92,000,000
Ending balance	$ 92,000,000	$ 92,000,000	$ 92,000,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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