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Segment information Segment Information (narrative Detail (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Gain (Loss) on Derivative | $ (80) | $ 79
Net investment income | 836 | 806
North America Agricultural Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Segment Income Loss Including Gains Losses On Crop Derivatives | 73 |
Gain (Loss) on Derivative | (1) |
Net investment income | 10 | 7
Segment Life [Member] |  |
Segment Reporting Information [Line Items] |  |
Net investment income | 89 | $ 83
Management Underwriting Income (Loss) | 75 |
Gains(Losses) On Fair Value Changes In Separate Account Assets | $ 30 |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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