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Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Realized capital gains and losses by asset type |  |  |  |
Total credit losses by asset type | $ (11) | $ (15) | $ (89) | $ (29)
Commitments to fund commercial mortgage loans, bank loans and agent loans | 1 | 0 | 0 | 0
Total | (10) | (15) | (89) | (29)
Municipal |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | (3) | 0 | (3) | 0
Corporate |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | 0 | (7) | (1) | (7)
ABS |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | (2) | (2) | (2) | (3)
MBS |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | 1 | 0 | (2) | (1)
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | (4) | (9) | (8) | (11)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net increases related to credit losses | (1) | 0 | (41) | 0
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Limited partnership interests | (3) | (2) | (10) | (3)
Bank loans, net |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net increases related to credit losses | $ (3) | $ (4) | $ (30) | $ (15)

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