Investments - Other investments by type (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Net investment income
Other, net	$ 1,375	$ 1,427
Agent loans, net
Net investment income
Other, net	631	666
Real estate
Net investment income
Other, net	315	292
Bank loans, net
Net investment income
Other, net	245	344
Derivatives and other
Net investment income
Other, net	$ 184	$ 125

Amount of investments classified as other.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f,g))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant