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Investments (Available-For-Sale Securities By Contractual Maturities) (Details) - Fixed Maturity AFS Securities [Member] - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale Securities, Debt Maturities, Amortized Cost |  |
Amortized cost | $ 91,190 | $ 92,429
Available-for-sale Securities, Debt Maturities, Fair Value |  |
Fair Value | 99,733 | $ 94,024
Fixed maturity AFS securities other than structured securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost |  |
Due in one year or less | 3,340 |
Due after one year through five years | 15,342 |
Due after five years through ten years | 17,216 |
Due after ten years | 47,823 |
Amortized cost | 83,721 |
Available-for-sale Securities, Debt Maturities, Fair Value |  |
Due in one year or less | 3,324 |
Due after one year through five years | 15,844 |
Due after five years through ten years | 18,385 |
Due after ten years | 54,381 |
Fair Value | 91,934 |
Structured securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost |  |
Amortized cost | 7,469 |
Available-for-sale Securities, Debt Maturities, Fair Value |  |
Fair Value | $ 7,799 |

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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