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Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 3,175 | $ 2,886
Industrial |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 817 | 675
Multifamily |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 1,006 | 830
Office |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 751 | 756
Retail |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 367 | 425
Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 234 | $ 200
Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 100.00% | 100.00%
Mortgage loans | Industrial |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 25.70% | 23.40%
Mortgage loans | Multifamily |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 31.70% | 28.80%
Mortgage loans | Office |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 23.70% | 26.20%
Mortgage loans | Retail |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 11.50% | 14.70%
Mortgage loans | Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 7.40% | 6.90%
East North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 251 | $ 239
East North Central | Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 7.90% | 8.30%
Middle Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 272 | $ 297
Middle Atlantic | Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 8.60% | 10.30%
Mountain |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 31 | $ 61
Mountain | Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 1.00% | 2.10%
New England |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 293 | $ 252
New England | Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 9.20% | 8.70%
Pacific |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 760 | $ 795
Pacific | Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 23.90% | 27.50%
South Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 710 | $ 585
South Atlantic | Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 22.40% | 20.30%
West North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 149 | $ 40
West North Central | Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 4.70% | 1.40%
West South Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 278 | $ 210
West South Central | Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 8.70% | 7.30%
Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 431 | $ 407
Other | Mortgage loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 13.60% | 14.10%

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