Annual report pursuant to Section 13 and 15(d)

Investments In Available-For-Sale Securities And Other Cost Investments - Unrealized Holding Gains and Losses (Details)

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Investments In Available-For-Sale Securities And Other Cost Investments - Unrealized Holding Gains and Losses (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Investments in Debt and Equity Securities    
Gross unrealized holding gains $ 0 $ 0
Gross unrealized holding losses $ 0 $ 0