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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Hedge ineffectiveness	$ 0
Senior Unsecured Notes 3.375% due 2024
Debt instrument, face amount	600
Designated as Hedging Instrument | Foreign Exchange Contract
Cash flow hedge gain (loss) to be reclassified within twelve months	13	$ 7
Designated as Hedging Instrument | Cash Flow Hedging
Derivative, terminated notional amount	600
Designated as Hedging Instrument | Interest rate swap liability
Derivative, terminated notional amount	$ 500

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- Definition

Derivative Instrument, Terminated Notional Amount

+ References

No definition available.

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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Face (par) amount of debt instrument at time of issuance.

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Amount of gain (loss) from the ineffectiveness of the hedge.

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