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Investments - Bank loans amortized cost by credit quality and year of acquisition (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available for Sale Securities |  |
Mortgage loans, net | $ 4,075 | $ 4,817
Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 1,085 |
Allowance | (67) |
Mortgage loans, net | 1,018 |
2015 and prior | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 38 |
2016 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 41 |
2017 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 193 |
2018 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 256 |
2019 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 263 |
Current | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 294 |
BBB | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 43 |
BBB | 2015 and prior | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 0 |
BBB | 2016 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 0 |
BBB | 2017 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 9 |
BBB | 2018 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 7 |
BBB | 2019 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 14 |
BBB | Current | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 13 |
BB | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 212 |
BB | 2015 and prior | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 20 |
BB | 2016 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 2 |
BB | 2017 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 25 |
BB | 2018 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 58 |
BB | 2019 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 53 |
BB | Current | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 54 |
B | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 607 |
B | 2015 and prior | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 11 |
B | 2016 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 23 |
B | 2017 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 115 |
B | 2018 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 141 |
B | 2019 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 122 |
B | Current | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 195 |
CCC and below | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 223 |
CCC and below | 2015 and prior | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 7 |
CCC and below | 2016 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 16 |
CCC and below | 2017 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 44 |
CCC and below | 2018 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 50 |
CCC and below | 2019 | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | 74 |
CCC and below | Current | Bank loans |  |
Schedule of Available for Sale Securities |  |
Amortized cost before allowance | $ 32 |

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121581245&loc=d3e21338-158488 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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