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Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other-than-temporary impairment losses by asset type |  |  |
Fixed income securities | $ (80) | $ (47) | $ (14)
Total credit losses by asset type | (82) | (47) | (14)
Commitments to fund commercial mortgage loans, bank loans and agent loans | 2 | 0 | 0
Fixed income securities |  |  |
Other-than-temporary impairment losses by asset type |  |  |
Fixed income securities | (5) | (14) | (10)
Corporate |  |  |
Other-than-temporary impairment losses by asset type |  |  |
Fixed income securities | (1) | (7) | (2)
ABS |  |  |
Other-than-temporary impairment losses by asset type |  |  |
Fixed income securities | (2) | (4) | (3)
MBS |  |  |
Other-than-temporary impairment losses by asset type |  |  |
Fixed income securities | (2) | (3) | (5)
Mortgage loans |  |  |
Other-than-temporary impairment losses by asset type |  |  |
Net increases related to credit losses | (39) | 0 | 0
Limited partnership interests |  |  |
Other-than-temporary impairment losses by asset type |  |  |
Limited partnership interests | (10) | (6) | (3)
Bank loans |  |  |
Other-than-temporary impairment losses by asset type |  |  |
Net increases related to credit losses | (28) | (26) | 0
Agent loans |  |  |
Other-than-temporary impairment losses by asset type |  |  |
Net increases related to credit losses | $ 0 | $ (1) | $ (1)

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