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Fair Value of Assets and Liabilities - Change in level 3 assets and liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | $ 10 | $ (23) | $ (2)
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings | 0 | 5 | 19
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date, included in earnings | 10 | (18) | 17
Realized capital gains and losses |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Gains (losses) for Level 3 assets still held at the balance sheet date | (8) | (36) | (20)
Net investment income |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Gains (losses) for Level 3 assets still held at the balance sheet date | 19 | 13 | 18
Interest credited to contractholder funds |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Gains (losses) for Level 3 assets still held at the balance sheet date | (10) | (4) | 26
Life and annuity contract benefits |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Gains (losses) for Level 3 assets still held at the balance sheet date | 9 | 9 | (7)
Contractholder funds: 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 | 0 | 5 | 19
Municipal |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | (3) | 2 | (12)
Corporate |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | 1 | 2 | 11
ABS |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | 0 | 0 | 2
Fixed income securities |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | (2) | 4 | 1
Equity securities |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | 13 | (32) | (4)
Free-standing derivatives, net |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | 0 | 5 | 1
Other assets |  |  |
Gains (losses) included in net income for Level 3 assets and liabilities: |  |  |
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings | $ (1) | $ 0 | $ 0

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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 unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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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