Disposition of Metropolitan Property and Casualty Insurance Company (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	$ 7,238	$ 7,418	$ 0
Cash and cash equivalents	69	765	0	$ 0
Liabilities held-for-sale	6,634	$ 4,650	$ 0
Metropolitan Property and Casualty Insurance Company
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	7,418
Cash and cash equivalents	765
Goodwill	328
Other assets	143
Liabilities held-for-sale	4,650
Other liabilities	249
Metropolitan Property and Casualty Insurance Company | Fixed maturity securities AFS
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	4,096
Metropolitan Property and Casualty Insurance Company | Equity securities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	57
Metropolitan Property and Casualty Insurance Company | Mortgages [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	355
Metropolitan Property and Casualty Insurance Company | Other invested assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	29
Metropolitan Property and Casualty Insurance Company | Investments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	4,537
Metropolitan Property and Casualty Insurance Company | Accrued investment income
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	38
Metropolitan Property and Casualty Insurance Company | Receivables [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	1,411
Metropolitan Property and Casualty Insurance Company | Deferred policy acquisition costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	196
Metropolitan Property and Casualty Insurance Company | Future policy benefits
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities held-for-sale	3,506
Metropolitan Property and Casualty Insurance Company | Other Policy-Related Balances
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities held-for-sale	33
Metropolitan Property and Casualty Insurance Company | Payables for collateral under securities loaned and other transactions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities held-for-sale	$ 862