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Restricted Investments - Maturities of Held-to-Maturity (Details) $ in Millions	Dec. 31, 2018 USD ($)
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

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

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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.

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