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Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Realized capital gains and losses by asset type |  |  |  |
Gross | $ (4) | $ (26) | $ (8) | $ (135)
Included in OCI | (1) | (2) | (2) | (2)
Net | (5) | (28) | (10) | (137)
Municipal |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross | 0 | 0 | 0 | (1)
Included in OCI | 0 | 0 | 0 | (2)
Net | 0 | 0 | 0 | (3)
Corporate |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross |  |  | 0 | (9)
Included in OCI |  |  | 0 | 3
Net |  |  | 0 | (6)
Asset-backed securities (“ABS”) |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross | 0 | 0 | (1) | (1)
Included in OCI | (1) | (1) | (1) | (1)
Net | (1) | (1) | (2) | (2)
Residential mortgage-backed securities (“RMBS”) |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross | 0 | 0 | (1) | (1)
Included in OCI | 0 | 0 | 0 | (3)
Net | 0 | 0 | (1) | (4)
Commercial mortgage-backed securities (“CMBS”) |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross | (2) | (1) | (2) | (9)
Included in OCI | 0 | (1) | (1) | 1
Net | (2) | (2) | (3) | (8)
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross | (2) | (1) | (4) | (21)
Included in OCI | (1) | (2) | (2) | (2)
Net | (3) | (3) | (6) | (23)
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross | 0 | (8) | 0 | (77)
Included in OCI | 0 | 0 | 0 | 0
Net | 0 | (8) | 0 | (77)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross | 0 | (1) | 0 | (1)
Included in OCI | 0 | 0 | 0 | 0
Net | 0 | (1) | 0 | (1)
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross | (2) | (16) | (3) | (32)
Included in OCI | 0 | 0 | 0 | 0
Net | (2) | (16) | (3) | (32)
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Gross | 0 | 0 | (1) | (4)
Included in OCI | 0 | 0 | 0 | 0
Net | $ 0 | $ 0 | $ (1) | $ (4)

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
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- Definition Amount before tax of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss and attributable to parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References No definition available. + Details
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