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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
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 | $ 3,214 | $ (472) | $ (215) | $ (604)
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 | 2,143 | (665) | (1,062) | (452)
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 | 731 | 204 | 265 | (65)
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 | $ 340 | $ (11) | $ 582 | $ (87)

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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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