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Segment information Segment Information (narrative Detail (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Derivative, (Gain) Loss on Derivative, Net | $ 22 | $ (48) | $ (68) | $ 442
Net investment income | 813 | 739 | 2,328 | 2,121
North America Agricultural Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment Income Loss Including Gains Losses On Crop Derivatives | 86 |  |  |
Derivative, (Gain) Loss on Derivative, Net | 5 |  |  |
Net investment income | 6 | 5 | 18 | 15
Segment Life [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net investment income | 78 | $ 71 | $ 230 | $ 207
Management Underwriting Income (Loss) | 70 |  |  |
Gains Losses On Fair Value Changes In Separate Account Assets | $ 24 |  |  |

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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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