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Investments - Nonimpaired and impaired mortgage loans (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Total |  |  |  | $ 4,534 | $ 4,486
Mortgage loans, non-impaired |  |  |  |  |
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Fixed rate mortgage loans |  |  |  | 4,438 | 4,442
Variable rate mortgage loans |  |  |  | 92 | 39
Total |  |  |  | 4,530 | 4,481
Net carrying value of impaired mortgage loans |  |  |  |  |
Impaired mortgage loans with a valuation allowance |  |  |  | 4 | 5
Impaired mortgage loans without a valuation allowance |  |  |  | 0 | 0
Total impaired mortgage loans |  |  |  | 4 | 5
Valuation allowance on impaired mortgage loans | $ 3 | $ 3 | $ 8 | 3 | 3
Rollforward of the valuation allowance on impaired mortgage loans |  |  |  |  |
Beginning balance | 3 | 3 | 8 |  |
Net increase (decrease) in valuation allowance | 1 | 0 | (4) |  |
Charge offs | (1) | 0 | (1) |  |
Ending balance | 3 | 3 | 3 |  |
Mortgage loans, non-impaired | Below 1.0 |  |  |  |  |
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Fixed rate mortgage loans |  |  |  | 3 | 60
Variable rate mortgage loans |  |  |  | 0 | 0
Total |  |  |  | 3 | 60
Mortgage loans, non-impaired | 1.0 - 1.25 |  |  |  |  |
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Fixed rate mortgage loans |  |  |  | 345 | 324
Variable rate mortgage loans |  |  |  | 0 | 0
Total |  |  |  | 345 | 324
Mortgage loans, non-impaired | 1.26 - 1.50 |  |  |  |  |
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Fixed rate mortgage loans |  |  |  | 1,141 | 1,293
Variable rate mortgage loans |  |  |  | 30 | 0
Total |  |  |  | 1,171 | 1,293
Mortgage loans, non-impaired | Above 1.50 |  |  |  |  |
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Fixed rate mortgage loans |  |  |  | 2,949 | 2,765
Variable rate mortgage loans |  |  |  | 62 | 39
Total |  |  |  | $ 3,011 | $ 2,804
Mortgage loans |  |  |  |  |
Average carrying value and interest income recognized on impaired mortgage loans |  |  |  |  |
Average impaired mortgage loans | $ 7 | $ 6 | $ 11 |  |

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