v3.8.0.1

Investments (Other Trading Account Assets) (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
Other trading account assets
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair Value		5,752	5,764
Other trading account assets | Short-term investments and cash equivalents
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		25	26
Fair Value		25	26
Other trading account assets | Fixed maturities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		3,509	3,634
Fair Value		3,507	3,453
Other trading account assets | Equity securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		1,007	985
Fair Value		1,155	1,056
Other trading account assets | Other Assets
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		6	4
Fair Value		7	5
Other trading account assets | Subtotal other trading account assets excluding derivative
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost or Cost		4,547	4,649
Fair Value		4,694	4,540
Other trading account assets | Derivative Instruments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair Value		$ 1,058	$ 1,224
[1] See Note 5 for details of balances associated with variable interest entities.

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Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests.

+ 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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