Acquisitions and Dispositions - Major classes of assets and liabilities to be transferred to buyer (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments
Assets held for sale	$ 36,803	$ 42,131
Liabilities
Liabilities held for sale	32,421	33,325
Discontinued Operations, Held-for-sale
Investments
Fixed income securities, at fair value (amortized cost, net $25,673 and $21,417)	27,469	23,789
Equity securities, at fair value (cost $23 and $1,113)	16	1,542
Mortgage loans, net	2,719	3,329
Limited partnership interests	1,633	3,046
Short-term, at fair value (amortized cost $1,155 and $993)	1,155	993
Other, net	827	1,998
Total investments	33,819	34,697
Cash	156	66
Deferred policy acquisitions costs	992	925
Reinsurance recoverables, net	1,930	2,005
Accrued investment income	242	229
Other assets	359	865
Separate accounts	3,335	3,344
Assets held for sale	40,833	42,131
Less: loss accrual	4,030	0
Assets held for sale	36,803	42,131
Liabilities
Reserve for future policy benefits	11,579	11,740
Contractholder funds	15,897	16,356
Deferred income taxes	945	973
Other liabilities and accrued expenses	665	912
Separate accounts	3,335	3,344
Liabilities held for sale	$ 32,421	$ 33,325