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Investments - Contractual Maturities of Available-for-Sale Investments (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 263 |
Due after one year through five years | 979 |
Due after five years through ten years | 172 |
Due after ten years | 450 |
Amortized Cost | 1,864 | $ 1,941
Estimated Fair Value |  |
Due in one year or less | 265 |
Due after one year through five years | 1,009 |
Due after five years through ten years | 176 |
Due after ten years | 456 |
Estimated Fair Value | $ 1,906 |

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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 current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=121645371&loc=d3e27198-111563 + Details
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