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Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | $ 6,283 | $ 5,787 |  |
Policy loans |  | 1,234 | 1,258 |  |
Funds withheld at interest |  | 6,954 | 5,432 |  |
Cash and cash equivalents |  | 2,948 | 3,408 | $ 1,449 | $ 1,890
Short-term investments |  | 87 | 227 |  |
Other invested assets |  | 3,070 | 2,829 |  |
Accrued investment income |  | 533 | 511 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 26,377 | 23,276 |  |
Funds Held under Reinsurance Agreements, Liability |  | 61 | 0 |  |
Collateral finance and securitization notes |  | 180 | 388 |  |
Carrying Value [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate | [1] | 6,283 | 5,787 |  |
Policy loans | [1] | 1,234 | 1,258 |  |
Funds withheld at interest | [1] | 6,747 | 5,292 |  |
Cash and cash equivalents | [1] | 1,810 | 1,930 |  |
Short-term investments | [1] | 23 | 30 |  |
Other invested assets | [1] | 910 | 1,482 |  |
Accrued investment income | [1] | 533 | 511 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities | [1] | 18,625 | 18,106 |  |
Funds Held under Reinsurance Agreements, Liability |  | 1,658 |  |  |
Long And Short Term Debt | [1] | 3,667 | 3,573 |  |
Collateral finance and securitization notes | [1] | 180 | 388 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 6,580 | 6,167 |  |
Policy loans |  | 1,234 | 1,258 |  |
Funds withheld at interest |  | 7,075 | 5,676 |  |
Cash and cash equivalents |  | 1,810 | 1,930 |  |
Short-term investments |  | 23 | 30 |  |
Other invested assets |  | 907 | 1,601 |  |
Accrued investment income |  | 533 | 511 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 19,540 | 19,683 |  |
Funds Held under Reinsurance Agreements, Liability |  | 1,657 |  |  |
Long And Short Term Debt |  | 3,886 | 3,901 |  |
Collateral finance and securitization notes |  | 153 | 351 |  |
Estimate of Fair Value Measurement [Member] | Net Asset Value [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 0 | 0 |  |
Policy loans |  | 0 | 0 |  |
Funds withheld at interest |  | 0 | 0 |  |
Cash and cash equivalents |  | 0 | 0 |  |
Short-term investments |  | 0 | 0 |  |
Other invested assets |  | 0 | 489 |  |
Accrued investment income |  | 0 | 0 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 0 | 0 |  |
Funds Held under Reinsurance Agreements, Liability |  | 0 |  |  |
Long And Short Term Debt |  | 0 | 0 |  |
Collateral finance and securitization notes |  | 0 | 0 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Funds Held under Reinsurance Agreements, Liability |  | 0 | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 0 | 0 |  |
Policy loans |  | 0 | 0 |  |
Funds withheld at interest |  | 0 | 0 |  |
Cash and cash equivalents |  | 1,810 | 1,930 |  |
Short-term investments |  | 23 | 30 |  |
Other invested assets |  | 6 | 5 |  |
Accrued investment income |  | 0 | 0 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 0 | 0 |  |
Funds Held under Reinsurance Agreements, Liability |  |  |  |  |
Long And Short Term Debt |  | 0 | 0 |  |
Collateral finance and securitization notes |  | 0 | 0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Funds Held under Reinsurance Agreements, Liability |  | 0 | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 0 | 0 |  |
Policy loans |  | 1,234 | 1,258 |  |
Funds withheld at interest |  | 0 | 0 |  |
Cash and cash equivalents |  | 0 | 0 |  |
Short-term investments |  | 0 | 0 |  |
Other invested assets |  | 70 | 89 |  |
Accrued investment income |  | 533 | 511 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 0 | 0 |  |
Funds Held under Reinsurance Agreements, Liability |  |  |  |  |
Long And Short Term Debt |  | 0 | 0 |  |
Collateral finance and securitization notes |  | 0 | 0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Funds Held under Reinsurance Agreements, Liability |  | 61 | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |  |  |  |
Mortgage loans on real estate |  | 6,580 | 6,167 |  |
Policy loans |  | 0 | 0 |  |
Funds withheld at interest |  | 7,075 | 5,676 |  |
Cash and cash equivalents |  | 0 | 0 |  |
Short-term investments |  | 0 | 0 |  |
Other invested assets |  | 831 | 1,018 |  |
Accrued investment income |  | 0 | 0 |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |  |  |  |
Interest-sensitive contract liabilities |  | 19,540 | 19,683 |  |
Funds Held under Reinsurance Agreements, Liability |  | 1,657 |  |  |
Long And Short Term Debt |  | 3,886 | 3,901 |  |
Collateral finance and securitization notes |  | $ 153 | $ 351 |  |
[1] | Carrying values presented herein may differ from those in the Company’s consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.

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