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Fair Value of Financial Instruments (Changes In Unrealized Gains (Losses) Within Level 3 Financial Instruments Carried At Fair Value And Still Held) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Changes in unrealized gains (losses) within Level 3 financial instruments carried at fair value and still held |  |  |  |  |
Change in unrealized gains (losses) included in net income | [1] | $ 138 | $ 229 | $ 788 | $ 887
Derivative Investments [Member] | Realized Gain (Loss) [Member] |  |  |  |  |
Changes in unrealized gains (losses) within Level 3 financial instruments carried at fair value and still held |  |  |  |  |
Change in unrealized gains (losses) included in net income |  | (169) | (2) | 106 | (76)
Indexed Annuity And Embedded Derivatives [Member] | Realized Gain (Loss) [Member] |  |  |  |  |
Changes in unrealized gains (losses) within Level 3 financial instruments carried at fair value and still held |  |  |  |  |
Change in unrealized gains (losses) included in net income |  | (6) |  | (7) | (15)
GLB Embedded Derivatives [Member] | Realized Gain (Loss) [Member] |  |  |  |  |
Changes in unrealized gains (losses) within Level 3 financial instruments carried at fair value and still held |  |  |  |  |
Change in unrealized gains (losses) included in net income |  | $ 313 | $ 231 | $ 689 | $ 978
[1] | Included in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).

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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 liabilities 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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