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Investments - Nonimpaired and impaired mortgage loans (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Total |  |  |  | $ 4,670 | $ 4,534
Rollforward of the valuation allowance on impaired mortgage loans |  |  |  |  |
Fixed income securities |  |  |  | 57,170 | 58,992
Mortgage loans, non-impaired |  |  |  |  |
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Fixed rate mortgage loans |  |  |  | 4,534 | 4,438
Variable rate mortgage loans |  |  |  | 132 | 92
Total |  |  |  | 4,666 | 4,530
Net carrying value of impaired mortgage loans |  |  |  |  |
Impaired mortgage loans with a valuation allowance |  |  |  | 4 | 4
Impaired mortgage loans without a valuation allowance |  |  |  | 0 | 0
Total impaired mortgage loans |  |  |  | 4 | 4
Valuation allowance on impaired mortgage loans | $ 3 | $ 3 | $ 3 | 3 | 3
Rollforward of the valuation allowance on impaired mortgage loans |  |  |  |  |
Beginning balance | 3 | 3 | 3 |  |
Net increase in valuation allowance | 0 | 1 | 0 |  |
Charge offs | 0 | (1) | 0 |  |
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 |  |  |  | 6 | 3
Variable rate mortgage loans |  |  |  | 31 | 0
Total |  |  |  | 37 | 3
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 |  |  |  | 273 | 345
Variable rate mortgage loans |  |  |  | 0 | 0
Total |  |  |  | 273 | 345
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 |  |  |  | 1,192 | 1,141
Variable rate mortgage loans |  |  |  | 0 | 30
Total |  |  |  | 1,192 | 1,171
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 |  |  |  | 3,063 | 2,949
Variable rate mortgage loans |  |  |  | 101 | 62
Total |  |  |  | 3,164 | 3,011
Mortgage loans |  |  |  |  |
Average carrying value and interest income recognized on impaired mortgage loans |  |  |  |  |
Average impaired mortgage loans | $ 4 | $ 7 | $ 6 |  |
Municipal |  |  |  |  |
Rollforward of the valuation allowance on impaired mortgage loans |  |  |  |  |
Fixed income securities |  |  |  | $ 9,169 | $ 8,328

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