Acquisitions and Dispositions - Major classes of assets and liabilities to be transferred to buyer (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Investments
Assets held for sale	$ 36,969	$ 42,131
Liabilities
Liabilities held for sale	32,775	33,325
Discontinued Operations, Held-for-sale
Investments
Fixed income securities, at fair value (amortized cost, net $23,968 and $21,417)	25,948	23,789
Equity securities, at fair value (cost $1,050 and $1,113)	1,519	1,542
Mortgage loans, net	2,855	3,329
Limited partnership interests	1,746	3,046
Short-term, at fair value (amortized cost $901 and $993)	901	993
Other, net	923	1,998
Total investments	33,892	34,697
Cash	158	66
Deferred policy acquisitions costs	978	925
Reinsurance recoverables, net	1,956	2,005
Accrued investment income	242	229
Other assets	378	865
Separate accounts	3,486	3,344
Assets held for sale	41,090	42,131
Less: loss accrual	4,121	0
Assets held for sale	36,969	42,131
Liabilities
Reserve for future policy benefits	11,633	11,740
Contractholder funds	16,025	16,356
Deferred income taxes	1,028	973
Other liabilities and accrued expenses	603	912
Separate accounts	3,486	3,344
Liabilities held for sale	$ 32,775	$ 33,325