Basis of Presentation and Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Revenue from non-insurance contracts with customers

Revenue from Non-Insurance Contracts with Customers

		Three months ended September 30,				Nine months ended September 30,
	Revenue Line Item	2018		2017		2018		2017
Commercial Lines
Installment billing fees	Fee income	$	9	$	9	$	26	$	28
Personal Lines
Installment billing fees	Fee income	10		11		30		33
Insurance servicing revenues	Other revenues	24		24		66		66
Group Benefits
Administrative services	Fee income	43		19		131		57
Mutual Funds
Advisor, distribution and other management fees	Fee income	245		229		722		660
Other fees	Fee income	21		22		63		75
Corporate
Investment management and other fees	Fee income	15		1		21		2
Transition service revenues	Other revenues	6		—		8		—
Total revenues subject to updated guidance		$	373	$	315	$	1,067	$	921