Acquisition and Disposition - Major classes of assets and liabilities to be transferred to buyer (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Investments
Assets held for sale	$ 36,829	$ 42,131
Liabilities
Liabilities held for sale	33,383	33,325
Discontinued Operations, Held-for-sale
Investments
Fixed income securities, at fair value (amortized cost, net $23,511 and $21,417)	25,073	23,789
Equity securities, at fair value (cost $1,191 and $1,113)	1,643	1,542
Mortgage loans, net	3,062	3,329
Limited partnership interests	1,942	3,046
Short-term, at fair value (amortized cost $1,652 and $993)	1,652	993
Other, net	936	1,998
Total investments	34,308	34,697
Cash	89	66
Deferred policy acquisitions costs	1,039	925
Reinsurance recoverables, net	1,982	2,005
Accrued investment income	248	229
Other assets	236	865
Separate accounts	3,339	3,344
Assets held for sale	41,241	42,131
Less: loss accrual	4,412	0
Assets held for sale	36,829	42,131
Liabilities
Reserve for future policy benefits	11,581	11,740
Contractholder funds	16,112	16,356
Deferred income taxes	857	973
Other liabilities and accrued expenses	1,494	912
Separate accounts	3,339	3,344
Liabilities held for sale	$ 33,383	$ 33,325