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Financial Instruments Cash Flow Hedges Included in AOCI (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Remaining Maturity				2 years
Additions and revaluations of derivatives designated as cash flow hedges	[1]	$ (2)	$ (5)	$ 16	$ (4)
After-tax net loss to be reclassified from AOCL into earnings over the next twelve months				4
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Beginning Balance		(3)	(7)	(26)	(2)
Additions and revaluations of derivatives designated as cash flow hedges		(1)	(3)	11	(3)
Clearance of hedge results to earnings		1	0	12	(5)
Ending Balance		$ (3)	$ (10)	$ (3)	$ (10)
[1] OCI is defined as other comprehensive income (loss).

X

- 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.

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- Definition

Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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