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Separate Accounts (Summary of Balances and changes in Separate Account Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 143,536	$ 182,583
Ul and Other [Member]
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	20,920	24,785	$ 20,952
Variable Annuities [Member]
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	105,573	136,665	128,121
Retirement Plan Services Segment [Member]
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	16,996	21,068	$ 18,809
Other Operations [Member]
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	47	65
Protective [Member] | Reinsurance Agreement [Member]
Fair Value, Separate Account Investment [Line Items]
Separate account liabilities	$ 42	$ 62

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+ References

No definition available.

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Amount of liability for variable contract in which all or portion of contract holder's funds is allocated to specific separate account and supported by assets held in separate account.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 80
-Section 50
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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-Publisher FASB
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