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General (Effects of Adoption of ASU 2018-12, Balance Sheet) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2020
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Deferred income taxes | $ 1,157 | $ 1,251 | [1] |  |  |
Total assets | 62,055 | 61,000 | [1] |  |  |
Claim and claim adjustment expenses | 22,409 | 22,120 | [1] |  |  |
Future policy benefits | 13,976 | 13,480 | [1] | $ 16,002 |  | $ 19,132
Total liabilities | 53,388 | 52,452 | [1] |  |  |
Retained earnings | 9,191 | 9,336 | [1] |  |  |
Accumulated other comprehensive loss | (3,308) | (3,598) | [1] |  |  |
Total stockholders' equity | 8,667 | 8,548 | [1] | $ 9,698 | [2] |
Operating Segments | Life & Group |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Claim and claim adjustment expenses | 704 | 695 |  |  |  |
Future policy benefits | $ 13,976 | 13,480 |  |  |  |
Prior to Adoption |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Deferred income taxes |  | 1,178 |  |  |  |
Total assets |  | 60,927 |  |  |  |
Claim and claim adjustment expenses |  | 25,099 |  |  |  |
Future policy benefits |  | 10,151 |  |  |  | $ 13,318
Total liabilities |  | 52,102 |  |  |  |
Retained earnings |  | 9,572 |  |  |  |
Accumulated other comprehensive loss |  | (3,557) |  |  |  |
Total stockholders' equity |  | 8,825 |  |  |  |
Prior to Adoption | Operating Segments | Life & Group |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Claim and claim adjustment expenses |  | 3,674 |  |  |  |
Future policy benefits |  | 10,151 |  |  |  |
Effect of Adoption |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Deferred income taxes |  | 73 |  |  |  |
Total assets |  | 73 |  |  |  |
Claim and claim adjustment expenses |  | (2,979) |  |  |  |
Future policy benefits |  | 3,329 |  |  |  |
Total liabilities |  | 350 |  |  |  |
Retained earnings |  | (236) |  |  |  |
Accumulated other comprehensive loss |  | (41) |  |  |  |
Total stockholders' equity |  | (277) |  |  |  |
Effect of Adoption | Operating Segments | Life & Group |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Claim and claim adjustment expenses |  | (2,979) |  |  |  |
Future policy benefits |  | $ 3,329 |  |  |  |
[1] | As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Condensed Consolidated Financial Statements for additional information.
[2] | As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Condensed Consolidated Financial Statements for additional information.

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