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Investments - Nonimpaired and impaired mortgage loans (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Total |  |  |  | $ 4,817 | $ 4,670
Rollforward of the valuation allowance on impaired mortgage loans |  |  |  |  |
Fixed income securities |  |  |  | 59,044 | 57,170
Mortgage loans, non-impaired |  |  |  |  |
Carrying value of non-impaired mortgage loans, summarized by debt service coverage ratio distribution |  |  |  |  |
Fixed rate mortgage loans |  |  |  | 4,721 | 4,534
Variable rate mortgage loans |  |  |  | 88 | 132
Total |  |  |  | 4,809 | 4,666
Net carrying value of impaired mortgage loans |  |  |  |  |
Impaired mortgage loans with a valuation allowance |  |  |  | 8 | 4
Impaired mortgage loans without a valuation allowance |  |  |  | 0 | 0
Total impaired mortgage loans |  |  |  | 8 | 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 | 0 | 1 |  |
Charge offs | 0 | 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 |  |  |  | 13 | 6
Variable rate mortgage loans |  |  |  | 32 | 31
Total |  |  |  | 45 | 37
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 |  |  |  | 225 | 273
Variable rate mortgage loans |  |  |  | 0 | 0
Total |  |  |  | 225 | 273
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 |  |  |  | 1,219 | 1,192
Variable rate mortgage loans |  |  |  | 18 | 0
Total |  |  |  | 1,237 | 1,192
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 |  |  |  | 3,264 | 3,063
Variable rate mortgage loans |  |  |  | 38 | 101
Total |  |  |  | 3,302 | 3,164
Mortgage loans |  |  |  |  |
Average carrying value and interest income recognized on impaired mortgage loans |  |  |  |  |
Average impaired mortgage loans | $ 5 | $ 4 | $ 7 |  |
Municipal |  |  |  |  |
Rollforward of the valuation allowance on impaired mortgage loans |  |  |  |  |
Fixed income securities |  |  |  | $ 8,620 | $ 9,169

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