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Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Realized capital gains and losses by asset type |  |  |  |
Fixed income securities | $ (12) | $ 7 | $ 2 | $ (29)
Total credit losses by asset type | (12) | 6 | 2 | (30)
Commitments to fund commercial mortgage loans, bank loans and agent loans | 0 | 1 | 0 | 1
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Fixed income securities | 0 | (1) | 1 | (4)
Corporate |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Fixed income securities | 0 | (1) | 0 | (2)
ABS |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Fixed income securities | 0 | 0 | 1 | (2)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total credit losses by asset type | 0 | 1 | 17 | (2)
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total credit losses by asset type | 0 | 0 | 0 | (6)
Bank loans, net |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total credit losses by asset type | (13) | 6 | (16) | (18)
Agent loans, net |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total credit losses by asset type | $ 1 | $ 0 | $ 0 | $ 0

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