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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 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] | $ 1,086 | $ (23) | $ 1,628
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 |  | 1,015 | (75) | 1,904
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 |  | 168 | 90 | (266)
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 |  | $ (97) | $ (38) | $ (14)
[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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