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Segment Information - Amortization of Other Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Amortization of other intangible assets $ 68 $ 14 $ 4
Commercial Lines      
Segment Reporting Information [Line Items]      
Amortization of other intangible assets 4 1 0
Property and Casualty, Personal Insurance Product Line [Member]      
Segment Reporting Information [Line Items]      
Amortization of other intangible assets 4 4 4
Group Benefits      
Segment Reporting Information [Line Items]      
Amortization of other intangible assets $ 60 $ 9 $ 0