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Goodwill Level 3 (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill, Impaired [Abstract]  
Carrying amount of goodwill allocated to reporting segment
 
Small Commercial
Mutual Funds
Personal Lines
Corporate [2]
Total
Balance, beginning of period [1]
$
—

$
149

$
119

$
230

$
498

Acquisitions [3]
38

31

—

—

69

Balance, end of period [1]
$
38

$
180

$
119

$
230

$
567