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Fair Value of Assets and Liabilities - Carrying values and fair value estimates of financial instruments not carried at fair value (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Mortgage loans, net | $ 752 | $ 746 |  |
Assets held for sale | 36,803 | 42,131 |  |
Financial liabilities |  |  |  |
Long-term debt | 7,980 | 7,825 |  |
Liability for collateral | 1,481 | 914 | $ 1,093 | $ 1,298
Liabilities held for sale | 32,421 | 33,325 |  |
Significant unobservable inputs (Level 3) | Amortized cost, net |  |  |  |
Financial assets |  |  |  |
Mortgage loans, net | 752 | 746 |  |
Bank loans | 1,592 | 772 |  |
Agent loans | 567 | 0 |  |
Assets held for sale | 2,852 | 4,206 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 20 | 0 |  |
Liabilities held for sale | 7,316 | 8,130 |  |
Significant unobservable inputs (Level 3) | Fair value |  |  |  |
Financial assets |  |  |  |
Mortgage loans, net | 795 | 792 |  |
Bank loans | 1,640 | 803 |  |
Agent loans | 570 | 0 |  |
Assets held for sale | 3,050 | 4,440 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 20 | 0 |  |
Liabilities held for sale | 8,248 | 9,424 |  |
Significant other observable inputs (Level 2) | Amortized cost, net |  |  |  |
Financial liabilities |  |  |  |
Long-term debt | 7,980 | 7,825 |  |
Liability for collateral | 1,481 | 914 |  |
Significant other observable inputs (Level 2) | Fair value |  |  |  |
Financial liabilities |  |  |  |
Long-term debt | 9,267 | 9,489 |  |
Liability for collateral | $ 1,481 | $ 914 |  |

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