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Business and Basis of Presentation (Value of Business Acquired) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021
--- | --- | --- | --- | ---
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP | $ 621 | [1] |  |  | $ 1,163 |
Balance, EOP | 530 |  | $ 621 | [1] |  | $ 1,163
Other businesses |  |  |  |  |  |
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP | 24 |  | 237 |  | 252 |
Balance, EOP | 19 |  | 24 |  | 237 | 252
As Previously Reported |  |  |  |  |  |
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP | 595 |  |  |  |  | 1,103
Balance, EOP |  |  | 595 |  |  |
As Previously Reported | Other businesses |  |  |  |  |  |
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP |  |  |  |  |  | 251
Effect of Change |  |  |  |  |  |
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP | 26 |  |  |  | 60 |
Balance, EOP |  |  | 26 |  |  | 60
Effect of Change | Other businesses |  |  |  |  |  |
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP |  |  |  |  | 1 |
Balance, EOP |  |  |  |  |  | 1
Gibraltar Life and Other |  |  |  |  |  |
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP | 597 |  | 746 |  |  | 911
Balance, EOP | $ 511 |  | $ 597 |  | 746 |
Gibraltar Life and Other | International Businesses |  |  |  |  |  |
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP |  |  |  |  | 911 |
Balance, EOP |  |  |  |  |  | 911
Gibraltar Life and Other | As Previously Reported | International Businesses |  |  |  |  |  |
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP |  |  |  |  |  | 852
Gibraltar Life and Other | Effect of Change | International Businesses |  |  |  |  |  |
Value of Business Acquired [Line Items] |  |  |  |  |  |
Balance, BOP |  |  |  |  | $ 59 |
Balance, EOP |  |  |  |  |  | $ 59
[1] | Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.

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- Definition Amount, after accumulated amortization, of present value of future profits of insurance contract acquired in business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479735/944-20-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479432/944-30-50-2B Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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