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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 3,355 | $ 3,175
Industrial |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 964 | 817
Multifamily |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 1,022 | 1,006
Office |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 762 | 751
Retail |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 363 | 367
Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 244 | 234
East North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 251 | 251
Middle Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 271 | 272
Mountain |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 31 | 31
New England |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 291 | 293
Pacific |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 803 | 760
South Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 691 | 710
West North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 148 | 149
West South Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | 383 | 278
Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 486 | $ 431
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 | 28.70% | 25.70%
Mortgage loans | Multifamily |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 30.50% | 31.70%
Mortgage loans | Office |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 22.70% | 23.70%
Mortgage loans | Retail |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 10.80% | 11.50%
Mortgage loans | Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 7.30% | 7.40%
Mortgage loans | East North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 7.50% | 7.90%
Mortgage loans | Middle Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 8.10% | 8.60%
Mortgage loans | Mountain |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 0.90% | 1.00%
Mortgage loans | New England |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 8.70% | 9.20%
Mortgage loans | Pacific |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 23.90% | 23.90%
Mortgage loans | South Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 20.60% | 22.40%
Mortgage loans | West North Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 4.40% | 4.70%
Mortgage loans | West South Central |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 11.40% | 8.70%
Mortgage loans | Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percent of Total | 14.50% | 13.60%

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