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Debt (Revolving credit facilities) (Details) - Unsecured - USD ($)	1 Months Ended
	Oct. 31, 2019	Aug. 31, 2021	Mar. 30, 2021	Mar. 31, 2018
Asia revolving credit facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 684,000,000		$ 950,000,000
Citi revolving credit facility I
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 4,000,000,000
Credit facility increase borrowing capacity	$ 500,000,000
Citi revolving credit facility II
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 4,350,000,000

X

- Definition

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

Amount of increase (decrease) of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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