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Fair Value of Assets and Liabilities - Change in unrealized gains and losses included in net income for level 3 assets and liabilities (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Recurring Level 3 assets | $ 2 | $ 10
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings | 23 | 3
Derivatives embedded in life and annuity contracts |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings | 23 | 3
Equity securities |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Recurring Level 3 assets | 2 | 10
Free-standing derivatives, net |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Recurring Level 3 assets | 0 | 1
Other assets |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |
Recurring Level 3 assets | $ 0 | $ (1)

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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets). Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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