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Derivative and Other Financial Instruments - Offsetting of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts Recognized in the Balance Sheet, Derivative Assets	$ 28	$ 63
Gross Amounts Not Offset in the Balance Sheet, Derivative Assets	17	17
Net Amount, Derivative Assets	11	46
Gross Amounts Recognized in the Balance Sheet, Derivative Liabilities	78	23
Gross Amounts Not Offset in the Balance Sheet, Derivative Liabilities	17	17
Net Amount, Derivative Liabilities	$ 61	$ 6

X

- 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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