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Fair Value (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage loans (1) | $ 92,506 | $ 83,763 |
Other invested assets, at estimated fair value | 18,202 | 20,038 |
Fair Value, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value Adjustment | (5) | (14) | $ (74)
Fair Value, Nonrecurring [Member] | Other Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value Adjustment | (136) | 0 | 0
Fair Value, Nonrecurring [Member] | Mortgages [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value Adjustment | (215) | (13) | $ (116)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage loans (1) | 474 | 263 |
Other invested assets, at estimated fair value | 63 | 0 |
Other Assets (2) | $ 0 | $ 1 |

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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
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