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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- Definition 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 + Details
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