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Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | $ 99,147 | $ 93,133
U.S. Government agencies and authorities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 831 | 1,015
Corporate and foreign debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 2,728 | 2,528
Mortgage-backed securities | Mortgage-Backed Securities, Issued by Private Enterprises |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 3,073 | 3,231
Equity securities (including mutual funds) |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 92,004 | 85,916
Cash, cash equivalents and short-term investments |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | 356 | 399
Receivable for securities and accruals |  |
Fair Value, Separate Account Investment [Line Items] |  |
Assets held in separate accounts | $ 155 | $ 44

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