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Restricted Investments, Non-current - Maturities of Held-to-Maturity (Details) $ in Millions	Dec. 31, 2017 USD ($)
Contractual maturities of our held-to-maturity restricted investments
Amortized Cost, Due in one year or less	$ 115
Amortized Cost, Due one year through five years	4
Amortized Cost, Total	119
Estimated Fair Value, Due in one year or less	115
Estimated Fair Value, Due one year through five years	4
Estimated Fair Value, Total	$ 119

X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 5
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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year through the fifth fiscal year following the latest fiscal year.

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Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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+ References

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Fair value of investments in debt securities classified as held-to-maturity.

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