Equity - Dividend Restrictions, Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Percent of insurer's policyholder surplus available for dividends		10.00%
Dividends received, net		$ 3,100
P&C Subsidiaries
Class of Stock [Line Items]
Dividends received		2,400
Extraordinary dividends received		1,400
Dividends received, subsequently contributed to subsidiary		100
Dividends received, subsequently used to pay debt		63
Dividends received, net		1,500
P&C Subsidiaries | Scenario, Forecast
Class of Stock [Line Items]
Dividends received, net	$ 350
Maximum dividends permitted to be paid	1,400
HLIC
Class of Stock [Line Items]
Extraordinary dividends received		800
Dividends received, net		1,400
HLI | Scenario, Forecast
Class of Stock [Line Items]
Dividends received	$ 300
Hartford Life and Annuity Insurance Company
Class of Stock [Line Items]
Extraordinary dividends received		550
HLA
Class of Stock [Line Items]
Dividends received, net		188
Mutual Funds
Class of Stock [Line Items]
Dividends received, net		$ 75