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Investments, Available-for-Sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cost or Amortized Cost [Abstract] |  |
Cost or amortized cost | $ 38,059 | $ 38,157
Estimated Fair Value [Abstract] |  |
Estimated fair value | 40,124 | 42,240
Available-for-Sale Fixed Maturities [Member] |  |
Cost or Amortized Cost [Abstract] |  |
Due in one year or less | 1,331 | 1,334
Due after one year through five years | 11,554 | 9,746
Due after five years through ten years | 13,078 | 14,892
Due after ten years | 12,056 | 12,134
Cost or amortized cost | 38,019 | 38,106
Estimated Fair Value [Abstract] |  |
Due in one year or less | 1,325 | 1,356
Due after one year through five years | 11,812 | 10,186
Due after five years through ten years | 13,069 | 15,931
Due after ten years | 13,877 | 14,714
Estimated fair value | $ 40,083 | $ 42,187

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- Definition Amortized cost 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 second through fifth 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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 + Details
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