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Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Realized capital gains and losses by asset type |  |  |  |
Total credit losses by asset type | $ 9 | $ (14) | $ (80) | $ (43)
Commitments to fund commercial mortgage loans, bank loans and agent loans | 1 | 0 | 1 | 0
Total | 10 | (14) | (79) | (43)
Municipal |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | 0 | 0 | (3) | 0
Corporate |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | (1) | 0 | (2) | (7)
ABS |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | 0 | 0 | (2) | (3)
MBS |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | (1) | (1) | (3) | (2)
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Total | (2) | (1) | (10) | (12)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net decreases (increases) related to credit losses | 1 | 0 | (40) | 0
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Limited partnership interests | 0 | (1) | (10) | (4)
Bank loans, net |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net decreases (increases) related to credit losses | 10 | (11) | (20) | (26)
Agent loans, net |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Net decreases (increases) related to credit losses | $ 0 | $ (1) | $ 0 | $ (1)

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