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Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Realized capital gains and losses by asset type |  |
Total credit losses by asset type | $ 78 | $ 14
Commitments to fund commercial mortgage loans, bank loans and agent loans | (1) | 0
Allowance for Credit Loss, Credit Loss Recognized In Net Income | 79 | 14
Corporate |  |
Realized capital gains and losses by asset type |  |
Total fixed income securities | (1) | 0
ABS |  |
Realized capital gains and losses by asset type |  |
Total fixed income securities | 0 | (1)
MBS |  |
Realized capital gains and losses by asset type |  |
Total fixed income securities | (3) | (1)
Fixed income securities |  |
Realized capital gains and losses by asset type |  |
Total fixed income securities | (4) | (2)
Mortgage loans |  |
Realized capital gains and losses by asset type |  |
Net (increases) decreases related to credit losses | 40 | 0
Limited partnership interests |  |
Realized capital gains and losses by asset type |  |
Limited partnership interests | 7 | 1
Bank loans, net |  |
Realized capital gains and losses by asset type |  |
Net (increases) decreases related to credit losses | $ 27 | $ 11

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