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Business Dispositions and Discontinued Operations - Major Classes of Assets and Liabilities Transferred by the Company to the Buyer in Connection with Sale (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2018
--- | --- | --- | ---
Assets |  |  |
Assets held for sale | $ 177 | $ 0 |
Liabilities |  |  |
Long-term debt | 4,352 | 4,348 |
Disposal Group, Including Discontinued Operation, Liabilities | $ 158 | $ 0 |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Life and Annuity Run-Off Business |  |  |
Assets |  |  |
Cash and investments |  |  | $ 27,058
Reinsurance recoverables |  |  | 20,718
Loss accrual |  |  | (3,044)
Other assets |  |  | 2,907
Separate account assets |  |  | 110,773
Assets held for sale |  |  | 158,412
Liabilities |  |  |
Reserve for future policy benefits and unpaid loss and loss adjustment expenses |  |  | 14,308
Other policyholder funds and benefits payable |  |  | 28,680
Long-term debt |  |  | 142
Other liabilities |  |  | 2,222
Separate account liabilities |  |  | 110,773
Disposal Group, Including Discontinued Operation, Liabilities |  |  | $ 156,125

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