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Financial Instruments (Schedule Of Investment Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Held to maturity |  |
Cost | $ 26 | $ 22
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 1
Securities held to maturity | $ 26 | $ 21

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