Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
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Financial Instruments - (Schedule of Effect of Derivative Instruments) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017 USD ($)	Jul. 31, 2017 GBP (£)	Jul. 31, 2017 EUR (€)	Jul. 10, 2017 GBP (£)	Jul. 10, 2017 EUR (€)	Jun. 30, 2017 GBP (£) hedge	Jun. 30, 2017 EUR (€) hedge
Currency Forward Contract \| Net Investment Hedging [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Number of instruments held \| hedge						2	2
Notional amount						£ 298,000,000	€ 999,000,000
Amount of gain (loss) reclassified from AOCE into income \| $	$ (19)
Subsequent Event \| Senior Notes, GBP Notes due 2022, interest payable at 1.700%
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Face amount of loans \| £		£ 300,000,000
Subsequent Event \| Senior Notes
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Face amount of loans				£ 300,000,000	€ 1,000,000,000
Subsequent Event \| Senior Notes \| Senior Notes, Euro Notes due 2021, interest payable at 0.400%
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Face amount of loans \| €			€ 500,000,000		500,000,000
Subsequent Event \| Senior Notes \| Senior Notes, Euro Notes due 2024, interest payable at 1.100%
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Face amount of loans \| €			€ 500,000,000		€ 500,000,000
Subsequent Event \| Senior Notes \| Senior Notes, GBP Notes due 2022, interest payable at 1.700%
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Face amount of loans \| £				£ 300,000,000