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Financial Instruments, Derivatives and Hedging Activities - FV (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair value of assets and liabilities
Long-term debt	$ 1,954	$ 1,845
Estimate of Fair Value Measurement
Fair value of assets and liabilities
Available for sale securities	11	10
Derivative assets	24	14
Derivative liabilities	26	31
Long-term debt	1,954	1,845
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1
Fair value of assets and liabilities
Available for sale securities	11	10
Derivative assets	4	3
Derivative liabilities	6	11
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Fair value of assets and liabilities
Derivative assets	20	11
Derivative liabilities	20	20
Long-term debt	$ 1,954	$ 1,845

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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