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Investments - OTTI (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
securities
Dec. 31, 2016
USD ($)
securities
Dec. 31, 2015
USD ($)
securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 12 $ 19 $ 46
No. of Securities | securities 26 32 45
Write-downs related to credit impairments $ 12 $ 1 $ 4
Impairment, Intent-related $ 0 $ 18 $ 42
No. of Securities, Intent-related | securities 10 7 20
U.S. corporate public securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 0 $ 3 $ 9
No. of Securities | securities 3 2 8
Impairment, Intent-related $ 0 $ 4 $ 9
No. of Securities, Intent-related | securities 3 1 7
Foreign corporate public securities and foreign governments      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 2 $ 12 $ 34
No. of Securities | securities 3 3 9
Impairment, Intent-related $ 0 $ 12 $ 32
No. of Securities, Intent-related | securities 0 2 8
Foreign corporate private securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 9 $ 1 $ 1
No. of Securities | securities 2 2 1
Residential mortgage-backed      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 1 $ 3 $ 2
No. of Securities | securities 17 25 26
Impairment, Intent-related $ 0 $ 2 $ 1
No. of Securities, Intent-related | securities 6 4 5
Commercial mortgage-backed      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 0 $ 0 $ 0
No. of Securities | securities 1 0 0
Impairment, Intent-related $ 0 $ 0 $ 0
No. of Securities, Intent-related | securities 1 0 0
Other asset-backed Securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Impairment $ 0 $ 0 $ 0
No. of Securities | securities 0 0 1