Fair Value Measurements and Derivatives - Derivatives in Cash Flow Hedging Relationships (Details) - Cash Flow Hedging [Member] $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
AOCI [Roll Forward]
Beginning balance	$ (68)
Gain (loss) recorded in OCI	66
Reclassification from AOCI	(56)
Ending balance	(58)
Forward Contracts [Member]
AOCI [Roll Forward]
Beginning balance	(4)
Gain (loss) recorded in OCI	7
Reclassification from AOCI	(1)
Ending balance	2
Currency Swap [Member]
AOCI [Roll Forward]
Beginning balance	(64)
Gain (loss) recorded in OCI	59
Reclassification from AOCI	(55)
Ending balance	$ (60)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

+ References

No definition available.

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- Definition

Amount before tax and reclassification adjustments of other comprehensive income (loss).

+ References

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- Definition

Amount before tax of reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17B
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL34724394-108580

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