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Derivative instruments Derivative instruments (Fair Value Hedging Relationships) (Details) - Interest expense, net [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative [Line Items]
Net unrealized (losses) gains recognized for interest rate swap contracts	$ (51)	$ 37	$ (215)	$ 18
Net unrealized gains (losses) recognized for related hedged debt	$ 51	$ (37)	$ 215	$ (18)

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+ References

No definition available.

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- Definition

Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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- Definition

Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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