Discontinued Operations - Assets and liabilities of businesses disposed (Details) - USD ($) $ in Millions	Jun. 30, 2021	May 31, 2021	Dec. 31, 2020
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets of discontinued annuity operations	$ 0		$ 47,885
Liabilities of discontinued annuity operations	0		44,458
Reclassify AOCI	190		1,273
Net investment in annuity businesses sold, excluding AOCI	$ 5,601		6,789
Annuity subsidiaries
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents		$ 2,060
Investments		38,322
Recoverables from reinsurers		6,748
Other assets		2,139
Total assets of discontinued annuity operations		49,269	47,885
Annuity benefits accumulated		43,690
Other liabilities		1,801
Liabilities of discontinued annuity operations		45,491	44,458
Receivable from AFG for real estate-related investments		0	537
Reclassify AOCI		(913)	(1,071)
Net investment in annuity businesses sold, excluding AOCI		$ 2,865	2,893
Annuity subsidiaries | Assets of discontinued annuity operations
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents			1,145
Investments			38,011
Recoverables from reinsurers			6,804
Other assets			1,925
Annuity subsidiaries | Liabilities of discontinued annuity operations
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annuity benefits accumulated			42,573
Other liabilities			$ 1,885