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Restricted Investments - Maturities of Held-to-Maturity (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Contractual maturities of our held-to-maturity restricted investments |
Amortized Cost, Due in one year or less | $ 105
Amortized Cost, Due one year through five years | 15
Amortized Cost, Total | 120
Estimated Fair Value, Due in one year or less | 105
Estimated Fair Value, Due one year through five years | 15
Estimated Fair Value, Total | $ 120

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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year 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 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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