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Fair Value Measurements - The carrying value and fair value of financial instruments (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Financial assets: |  |  |
Mortgage loans | $ 408 | $ 377 |
Long-term debt | 1,963 | 1,963 |
Cash and cash equivalents from discontinued operations | 636 |  | $ 368
Annuity subsidiaries | Assets of discontinued annuity operations |  |  |
Financial assets: |  |  |
Cash and cash equivalents from discontinued operations | 636 | 1,145 |
Level 1 |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 1,691 | 1,665 |
Mortgage loans | 0 | 0 |
Total financial assets not accounted for at fair value | 1,691 | 1,665 |
Long-term debt | 0 | 0 |
Total financial liabilities not accounted for at fair value | 0 | 0 |
Level 1 | Annuity subsidiaries | Assets of discontinued annuity operations |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 636 | 1,145 |
Mortgage loans | 0 | 0 |
Policy loans | 0 | 0 |
Total financial assets not accounted for at fair value | 636 | 1,145 |
Level 1 | Annuity subsidiaries | Liabilities of discontinued annuity operations |  |  |
Financial assets: |  |  |
Annuity benefits accumulated | 0 | 0 |
Total financial liabilities not accounted for at fair value | 0 | 0 |
Level 2 |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 0 | 0 |
Mortgage loans | 0 | 0 |
Total financial assets not accounted for at fair value | 0 | 0 |
Long-term debt | 2,215 | 2,322 |
Total financial liabilities not accounted for at fair value | 2,215 | 2,322 |
Level 2 | Annuity subsidiaries | Assets of discontinued annuity operations |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 0 | 0 |
Mortgage loans | 0 | 0 |
Policy loans | 0 | 0 |
Total financial assets not accounted for at fair value | 0 | 0 |
Level 2 | Annuity subsidiaries | Liabilities of discontinued annuity operations |  |  |
Financial assets: |  |  |
Annuity benefits accumulated | 0 | 0 |
Total financial liabilities not accounted for at fair value | 0 | 0 |
Level 3 |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 0 | 0 |
Mortgage loans | 411 | 382 |
Total financial assets not accounted for at fair value | 411 | 382 |
Long-term debt | 3 | 3 |
Total financial liabilities not accounted for at fair value | 3 | 3 |
Level 3 | Annuity subsidiaries | Assets of discontinued annuity operations |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 0 | 0 |
Mortgage loans | 1,262 | 1,270 |
Policy loans | 148 | 151 |
Total financial assets not accounted for at fair value | 1,410 | 1,421 |
Level 3 | Annuity subsidiaries | Liabilities of discontinued annuity operations |  |  |
Financial assets: |  |  |
Annuity benefits accumulated | 42,360 | 43,081 |
Total financial liabilities not accounted for at fair value | 42,360 | 43,081 |
Carrying Value |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 1,691 | 1,665 |
Mortgage loans | 408 | 377 |
Total financial assets not accounted for at fair value | 2,099 | 2,042 |
Long-term debt | 1,963 | 1,963 |
Total financial liabilities not accounted for at fair value | 1,963 | 1,963 |
Carrying Value | Annuity subsidiaries | Assets of discontinued annuity operations |  |  |
Financial assets: |  |  |
Total financial assets not accounted for at fair value | 2,028 | 2,547 |
Carrying Value | Annuity subsidiaries | Liabilities of discontinued annuity operations |  |  |
Financial assets: |  |  |
Annuity benefits accumulated | 41,760 | 41,460 |
Total financial liabilities not accounted for at fair value | 41,760 | 41,460 |
Fair Value |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 1,691 | 1,665 |
Mortgage loans | 411 | 382 |
Total financial assets not accounted for at fair value | 2,102 | 2,047 |
Long-term debt | 2,218 | 2,325 |
Total financial liabilities not accounted for at fair value | 2,218 | 2,325 |
Fair Value | Annuity subsidiaries | Assets of discontinued annuity operations |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 636 | 1,145 |
Mortgage loans | 1,262 | 1,270 |
Policy loans | 148 | 151 |
Total financial assets not accounted for at fair value | 2,046 | 2,566 |
Fair Value | Annuity subsidiaries | Liabilities of discontinued annuity operations |  |  |
Financial assets: |  |  |
Annuity benefits accumulated | 42,360 | 43,081 |
Total financial liabilities not accounted for at fair value | $ 42,360 | $ 43,081 |

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