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Investments - Contractual Maturities of Investments (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost
Due in one year or less	$ 1,025
Due after one year through five years	799
Amortized Cost	1,824	$ 2,700
Estimated Fair Value
Due in one year or less	1,023
Due after one year through five years	789
Estimated Fair Value	$ 1,812

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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).

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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.

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