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Investments - Other investments by type (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Other	$ 4,092	$ 3,972
Bank loans
Schedule of Investments [Line Items]
Other	1,681	1,702
Policy loans
Schedule of Investments [Line Items]
Other	900	905
Real estate
Schedule of Investments [Line Items]
Other	763	632
Agent loans
Schedule of Investments [Line Items]
Other	562	538
Other
Schedule of Investments [Line Items]
Other	$ 186	$ 195

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- Definition

Amount of investments classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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=6879938&loc=d3e572229-122910

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+ References

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