Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Derivative
Gain from Components Excluded from Assessment of Cash Flow Hedge Effectiveness		$ 7
Designated as Hedging Instrument [Member]
Derivative
Maximum Remaining Maturity of Foreign Currency Derivatives	18 months
Not Designated as Hedging Instrument [Member]
Derivative
Maximum Remaining Maturity of Foreign Currency Derivatives	3 months

The gain relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

Name:	us-gaap_GainFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectiveness
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration