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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 | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
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] | $ (472) | $ 564 | $ (604) | $ 1,351
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 |  | 204 | (1) | (65) | 105
Indexed Annuity And IUL Contracts [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 |  | (11) | (11) | (87) | (18)
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 |  | $ (665) | $ 576 | $ (452) | $ 1,264
[1] | Included in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).

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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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