v3.8.0.1

Investments (Trading Account Assets Supporting Insurance Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		$ 21,364	$ 21,407
Fair Value	[1]	22,097	21,840
Fixed maturities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		19,841	19,655
Fair Value		20,209	19,850
Equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		1,278	1,097
Fair Value		1,643	1,335
Short-term investments and cash equivalents
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		245	655
Fair Value		245	655
Corporate securities | Fixed maturities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		13,816	13,903
Fair Value		14,073	13,997
Commercial mortgage-backed securities | Fixed maturities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		2,294	2,032
Fair Value		2,311	2,052
Residential mortgage-backed securities | Fixed maturities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		961	1,142
Fair Value		966	1,150
Asset-backed securities | Fixed maturities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		1,363	1,333
Fair Value		1,392	1,349
Foreign government bonds | Fixed maturities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		1,050	915
Fair Value		1,057	926
U.S. government authorities and agencies and obligations of U.S. states | Fixed maturities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		357	330
Fair Value		$ 410	$ 376
[1] See Note 5 for details of balances associated with variable interest entities.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: 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.(a),1(b))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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