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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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