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Investments (Fair Value of Trading Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | $ 1,620 | $ 1,712
Corporate Bonds [Member] | Fixed maturity AFS securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 1,335 | 1,360
ABS [Member] | Fixed maturity AFS securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 15 | 19
U.S. government bonds [Member] | Fixed maturity AFS securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 115 | 164
Foreign Government Bonds [Member] | Fixed maturity AFS securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 23 | 23
RMBS [Member] | Fixed maturity AFS securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 86 | 97
CMBS [Member] | Fixed maturity AFS securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 2 | 2
CLOs [Member] | Fixed maturity AFS securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 3 | 6
State and municipal bonds [Member] | Fixed maturity AFS securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | 17 | 18
Hybrid and redeemable preferred securities [Member] | Fixed maturity AFS securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Trading securities | $ 24 | $ 23

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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + 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 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 3: 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 + Details
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