Supplemental Consolidated Cash and Cash Flow Information - Narrative (Details) - USD ($) $ in Billions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2021	Jun. 30, 2019
Supplemental Cash Flow Elements [Abstract]
Transfer of investments and policy loans	$ 2.1
Reinsurance block of in-force fixed and variable annuity business	$ 2.9	$ 3.2	$ 2.9

Value of investments transferred from the entity's investments in noncash transactions.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

Name:	us-gaap_TransferOfInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration