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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 |

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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 + Details
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- 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 + Details
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