Discontinued Operations - Assets and liabilities of businesses to be disposed (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 636		$ 368
Total assets of discontinued annuity operations	48,139	$ 47,885
Liabilities of discontinued annuity operations	44,893	44,458
Reclassify AOCI	967	1,273
Net investment in annuity businesses to be sold, excluding AOCI	6,685	6,789
Annuity subsidiaries
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets of discontinued annuity operations		47,885
Liabilities of discontinued annuity operations	44,893	44,458
Receivable from AFG for real estate-related investments	567	537
Reclassify AOCI	(801)	(1,071)
Net investment in annuity businesses to be sold, excluding AOCI	3,012	2,893
Annuity subsidiaries | Assets of discontinued annuity operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	636	1,145
Available for sale (AFS) fixed maturities	34,754	34,123
Trading fixed maturities	40	42
Equity securities, at fair value	624	774
Investments accounted for using the equity method	671	646
Mortgage loans	1,244	1,251
Policy loans	148	151
Equity index call options	813	825
Other Investments	180	199
Total cash and investments	39,110	39,156
Recoverables from reinsurers	6,797	6,804
Agents’ balances and premiums receivable	3	2
Deferred policy acquisition costs	531	302
Variable annuity assets (separate accounts)	666	664
Other assets	1,032	957
Total assets of discontinued annuity operations	48,139
Annuity subsidiaries | Liabilities of discontinued annuity operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annuity benefits accumulated	42,880	42,573
Life, accident and health reserves	601	607
Variable annuity liabilities (separate accounts)	666	664
Other liabilities	$ 746	$ 614