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Derivatives And Hedging Activities Effect of Derivative Instruments in Consolidated Statement of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in OCI (Effective Portion)	$ (33)	$ (15)	$ 24
Loss Reclassified from Accumulated OCI into Income (Effective Portion)	0	7	126
Gain Recognized in Income (Ineffective Portion Excluded from Effectiveness Testing)	0	0	0
Designated as Hedging Instrument | Cash Flow Hedging | Commodity Derivative
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in OCI (Effective Portion)	(45)	45	(22)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	14	18
Loss Reclassified from Accumulated OCI into Income (Effective Portion)			42
Gain Recognized in Income (Ineffective Portion Excluded from Effectiveness Testing)	0	0	0
Designated as Hedging Instrument | Cash Flow Hedging | Foreign Currency Derivative
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in OCI (Effective Portion)	14	(4)	62
Loss Reclassified from Accumulated OCI into Income (Effective Portion)	14	27	84
Gain Recognized in Income (Ineffective Portion Excluded from Effectiveness Testing)	0	0	0
Designated as Hedging Instrument | Net Investment Hedging | Foreign Currency Derivative
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in OCI (Effective Portion)	2	(34)	16
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	0	2
Loss Reclassified from Accumulated OCI into Income (Effective Portion)			0
Gain Recognized in Income (Ineffective Portion Excluded from Effectiveness Testing)	0	0	0
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain on Derivative	(2)		(1)
Derivative, Loss on Derivative		5
Not Designated as Hedging Instrument | Foreign Currency Derivative
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain on Derivative	$ (2)		$ (1)
Derivative, Loss on Derivative		$ 5

X

- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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