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Investment Holding Level 4 Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net Investment Income [Line Items] |  |  |
Net Investment Income | $ 2,961 | $ 3,030 | $ 3,154
Investment Income, Investment Expense | 113 | 118 | 122
Fixed Maturities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Net Investment Income | 2,379 | 2,409 | 2,420
Equity Securities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Net Investment Income | 31 | 25 | 38
Mortgages [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Net Investment Income | 252 | 267 | 265
Policy Loans [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Net Investment Income | 83 | 82 | 80
Limited Partnerships and Other Alternative Investments [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Net Investment Income | 214 | 227 | 294
Other Investments [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Net Investment Income | $ 115 | $ 138 | $ 179

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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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